This file has been updated periodically ever since TeX82 was born; it has been summarized in "The errors of TeX," Software Practice & Experience, July 1989. Entries are in chronological order; thus the most recent news (including all bugfixes made since that article was published) appears at the bottom of the file. [Add 519 to these entry numbers to get the corresponding number in the published article. The article also translates all module numbers to their final form; what you are about to read is "authentic source material" from the early days before TeX converged.] ------------------------------------------------------------------------------- First updates to the TeX82 listing published in September, 1982. (These changes were included in the original Version 0 of TeX, but they were discovered after the listing went to press.) 1. Module 943, line 6 (bug discovered 9/28) change "if cur_cmd=char_num then" to if (cur_cmd=letter) or (cur_cmd=other_char) then r:=qi(cur_chr) else if cur_cmd=char_num then 2. "pause" changed to "pausing" and "pause_code" to "pausing code", throughout. 3. Module 719, lines 8 and 11 (bug discovered 9/28) insert "rule_save:=overfull_rule; overfull_rule:=0;" after "save_ptr-2;" insert "overfull_rule:=rule_save;" before "q:=p+list_offset;" and insert a declaration of "overfull_rule: scaled" in module 716. 4. Module 1128, lines 6 and following (bug discovered 9/28) change "while n<>0 do" to "loop" change "goto done" to begin scan_left_brace; new_save_level(false_group); goto done; end change "... return 1130>;" to ... return 1130> else if n=0 then begin new_save_level(case_group); goto done; end; and change "done: ... (false_group);" to "done:". 5. Module 182, line 10 (suggestion by DRF on 9/30) change "0.0" to "?.?" 6. Module 682, new definition of math_spacing (decision of 10/2) "0234000122*4000133**3**344*0400400*000000234000111*4111112341011" 7. Module 684, new code for case "4" (decision of 10/2) "4": if cur_style0 then decr(h) else h:=trie_op_hash_size; 11. Module 457 line 3 (typo discovered 10/9/82) change `\.!' to `\.\&' 12. Module 1245 line 8 (bug fixed 10/9/82, discovered by MMD) insert the following between "begin" and "if": if format_ident<>0 then initialize; {erase preloaded format} ** Version 0.1 incorporates the above changes. 13. This is an extension to the language, put in to satisfy people who objected to the fact that \write (and \openout and \closeout) only caused action after being deferred to the next \shipout. Some applications call for immediate output, hence a new feature: \immediate followed by \openout or \write or \closeout causes the output action to take place without delay. For example, \immediate\write{x} is equivalent to \shipout\vbox{\write{x}} except that the latter also puts an empty page into the DVI file. The extension requires the following new code: 13a. Insert `\immediate' after `\closeout' in module 1248. 13b. Define immediate_code=4 and include the following in module 1252: primitive("immediate",extension,immediate_code); 13c. Include the following in module 1254: immediate_code:print_esc("immediate"); 13d. And, in module 1256: immediate_code:@; 13e. Finally, there's a new module inserted after old module 1280. Here is the WEB coding for this module: @ The presence of `\.{\\immediate}' causes the |do_extension| procedure to descend to one level of recursion. Nothing happens unless \.{\\immediate} is followed by `\.{\\openout}', `\.{\\write}', or `\.{\\closeout}'. @^recursion@> @= begin get_nc_token; if (cur_cmd=extension)and(cur_chr<=close_node) then begin p:=tail; do_extension; {append a whatsit node} out_what(tail); {do the action immediately} flush_node_list(tail); tail:=p; link(p):=null; end else back_input; end; ** Version 0.2 incorporates the above changes. 14. Like change 11, this one doesn't affect the program, it just improves the documentation: Insert the following definitions in module 106: define set_glue_ratio_zero(#) == #:=0.0 {assign representation of zero ratio} define set_glue_ratio_one(#) == #:=1.0 {assign representation of unit ratio} These macros are now introduced in a dozen or so future modules, thereby eliminating most of the system-dependent changes needed elsewhere for ratios. (Note: I also changed 0 to 0.0 in two places of module 182, where a glue_ratio comparision was being made.) 15. Change of module 576 (discovered by HWT, 10/14/82) "hd:quarterword" should be "hd:eight_bits". (The same error occurs in module 522, but in that module the remedy is simply to delete the declaration of hd, since this variable is no longer used.) 16. A most embarrassing bug (discovered by DRF, 10/14/82) Replace module 531 by: @ A mild optimization of the output is performed by the |dvi_pop| routine, which issues a |pop| unless it is possible to cancel a `|push| |pop|' pair. The parameter to |dvi_pop| is the byte address following the old |push| that matches the new |pop|. @p procedure dvi_pop(@!l:integer); begin if (l=dvi_offset+dvi_ptr)and(dvi_ptr>0) then decr(dvi_ptr) else dvi_out(pop); end; Now we need to make a few changes to subsequent modules: 16a. In 549, after "incr(cur_s)", insert if cur_s>0 then dvi_out(push); and before "decr(cur_s)", insert if cur_s>0 then dvi_pop(save_loc); 16b. Delete "dvi_out(push);" and "dvi_pop;" from modules 553, 558, 562, 567. 16c. Change module 559 just as in 16a. 17. Module 605, line 6 (discovered 10/15/82) The test should be "prev_depth>ignore_depth" ** Version 0.3 incorporates the above changes. 18. Module 11 (noticed by WLS, 10/16/82) Delete the definition of align_size (it's harmless but never used) 19. (This change and the next cause major changes to the TRIP output; file TRIP.LOG and its relatives are being kept up to date on area [tug,dek].) The change avoids error messages when vpackage is called during output. Such messages can occur when there was no error, because the page is being boxed without the \skip glue from its insertions; so they should be omitted. The user who really wants such messages can still get them by saying "\setbox255=\vbox to 1ht255{\unbox255}". In module 903, insert the followng before the declaration of "wait": save_vbadness:integer; {saved value of |vbadness|} save_vfuzz: scaled; {saved value of |vfuzz|} Then in module 924, insert save_vbadness:=vbadness; vbadness:=inf_bad; save_vfuzz:=vfuzz; vfuzz:=max_dimen; {inhibit error messages} before the call on vpackage, and vbadness:=save_vbadness; vfuzz:=save_vfuzz; after. 20. Module 917 computes |page_size| improperly. (Noticed 10/21/82) Delete the statement "page_so_far[1]:=page_so_far[1]+width(q);" and change the preceding statement to: page_size:=page_size-h-width(q); (The comment about page_so_far in the first paragraph of module 895 is correct; I mistakenly introduced a bug in module 917 some months after writing the first draft of the code, believing that I was making the algorithm more elegant or something.) ** Version 0.4 incorporates the above changes. 21. Since TeX82 applied to (the "woven" documentation) TEX.TEX uses about 11500 words of variable-size memory, I'm increasing hi_mem_size (in module 12) from 12000 to 13000. Actually, I recommend using considerably larger values for mem_max and hi_mem_size, whenever possible. 22. Addition of the \boxmaxdepth parameter (10/22/82): This involves renumbering hfuzz_code through dimen_pars, in module 234, to numbers 9 through 18; inserting the lines @d box_max_depth_code=8 {maximum depth of explicit vboxes} @d box_max_depth==dimen_par(box_max_depth_code) box_max_depth_code:print_esc("boxmaxdepth"); to module 234 and primitive("boxmaxdepth",assign_dimen,box_max_depth_code); to module 235; and changing the call on vpack in module 996 to vpackage(link(head),saved(2),saved(1),box_max_depth); ** Version 0.5 incorporates the above changes. 23. Module 1224, line 4 (bug found by GMK/HWT on 10/26/82) change "(k+x>eqtb_size)" to "(k+x>eqtb_size+1)" 24. Module 247, line 13 (bug found 10/26/82) (bug was reflected in TRIP.LOG but not noticed) change "ch_code(p)" to "ch_code(p-single_base)" 25. Module 670, line 18 (bug found 10/27/82) interchange the statements "fetch(...)" and "math_type(...):=..." (since the fetch routine sometimes has a side-effect of changing math_type) A major change (Version 0.6) made on October 28: The following list of changes counts as "number 26" on the list. Fonts now have identifiers instead of code numbers; the "\:" primitive has disappeared; and there are associated new features for "\the". a. In module 11, delete bad_font_code. b. In modules 170 and 172, delete print_esc(":"), and change `print_int(font_code' to `sprint_cs(font_ident'. c. In module 205, the comment for set_font is revised. d. In module 217, there are now five locations for control sequences that are perpetually defined; undefined_control_sequence is therefore defined to be frozen_control_sequence+5. e. In module 248, sprint_cs is now included among . f. Delete the primitive ":" in modules 250 and 251. g. Add to module 376: h. In module 377, seven levels are now distinguished; we define font_val=4, ident_val=5, tok_val=6. i. In module 380, delete the previous cases for def_family and set_font, and the following takes the place of case assign_toks: assign_toks,def_family,set_font,def_font: ; j. Module 382 (which now has a new name) has this new ending: else if cur_cmd=assign_toks then scanned_result(equiv(m))(tok_val) else k. Module 389 becomes = if cur_cmd=set_font then scanned_result(cur_chr)(font_val) else if cur_cmd=def_font then scanned_result(font_ident[cur_font])(ident_val) else begin scan_four_bit_int; scanned_result(font_ident[equiv(m+cur_val)])(ident_val); end l. In module 393, the relation `<>tok_val' becomes `<=mu_val'. m. In module 426, the relation `=tok_val' becomes '>=ident_val'. Also add a new case to the case statement: font_val: begin print(font_name[cur_val]); if font_size[cur_val]<>font_dsize[cur_val] then begin print(" at "); print_scaled(font_size[cur_val]); print("pt"); end; end; n. The body of module 427 becomes: begin p:=temp_head; link(p):=null; if cur_val_level=ident_val then store_new_token(cs_token_flag+cur_val) else if cur_val<>null then begin r:=link(cur_val); {do not copy the reference count} while r<>null do begin store_new_token(info(r)); r:=link(r); end; end; the_toks:=p; end o. In module 480, delete user_font_code; there's a new comment: When the user defines \font\f, say, TeX assigns an internal number to the user's font \f. For example, if this internal number is 13, we will have font_ident[13]=p and equiv(p)=13, where p is the eqtb location of the control sequence \f. p. In module 481, delete the declaration of font_number, and replace the declaration of font_code by font_ident:array[internal_font_number] of pointer; q. New stuff in module 483 (also delete references to font_number, font_code): define bad_font_ident=frozen_control_sequence+4 {denotes a null font} font_name[undefined_font]:="nullfont"; font_ident[undefined_font]:=bad_font_ident; text(bad_font_ident):="nullfont"; eq_level(bad_font_ident):=level_one; eq_type(bad_font_ident):=set_font; equiv(bad_font_ident):=undefined_font; r. In module 490, parameter u is new of type pointer, and the read_font_info subroutine is changed to a function that returns an internal_font_number. There's a new local variable g:internal_font_namber; {the number to return} and we set g:=undefined_font immediately upon entering read_font_info. Also set read_font_info:=g just before exiting. s. In module 491, print_int(u) becomes sprint_cs(u). t. Delete the statements involving font_code and font_number in module 506, and set g:=f at the end of that module. u. The body of module 507 becomes: = procedure scan_font_ident; var f:internal_font_number; begin ; if cur_cmd=set_font then f:=cur_chr else begin print_nl("! Missing font identifier"); help2("I was looking for a control sequence whose") ("current meaning has been defined by \font."); back_error; f:=undefined_font; end; end; v. New beginning of module 508: The following routine is used to implement `\texinfo f n'. The boolean parameter writing is set true if the calling program intends to change the parameter value. = and "scan_font_number" is changed to "scan_font_ident". w. In module 509, "print_int(font_code" becomes "sprint_cs(font_ident". Also "font code is defined" becomes "\font is loaded" in the help. x. In module 940, the first line of help is changed to "You have to specify a font identifier," y. The set_font case in module 1138 reduces to set_font: define(cur_font_loc,data,cur_chr); z. In module 1153, delete all the complicated stuff starting with "scan_int" and substitute simply this: scan_font_ident; define(p,data,cur_val); end; aa. Change new_font to new_font(a) in module 1169, and add parameter (a:small_number) in module 1170. Also add the label common_ending, and declare variable u to have type pointer. The code beginning with "scan_int" is changed to the following: get_token; if cs_ptr=0 then ; u:=cs_ptr; scan_optional_equals; scan_file_name; ; ; f:=read_font_info(u,cur_name,cur_area,s); common_ending: define(u,set_font,f); font_ident[f]:=u; exit:end; bb. New module 1172: When the user gives a new identifier to a font that was previously loaded, the new value becomes the font_ident of record. Font names `xyz' and `XYZ' are considered to be different. = for f:=font_base+1 to font_ptr do if [the test previously in module 1174] then goto common_ending cc. New module 1173: = begin print_nl("! A font identifier must be a control sequence"); help2("You should say, e.g., `\font\f=fontfilename'.") ("(I'm going to ignore the \font command you just gave.)"); back_error; return; end dd. New module 1174: = set_font:begin print("select font "); print(font_name[chr_code]); if font_size[chr_code]<>font_dsize[chr_code] then begin print(" at "); print_scaled(font_size[chr_code]); print("pt"); end; end; ee. Delete the comment at the beginning of module 1227, and delete the loop for k:=0 to bad_font_code-1, and delete dump_int(undefined_font). ff. Delete the repeat loop in module 1228. gg. Change font_code to font_ident in module 1229, and change print_int(font_code to sprint_int(font_ident. hh. In module 1230, begin undump(single_base)(undefined_control_sequence)(font_ident[k]); undump_qqqq(font_check[k]); [and continue as before] The changes above have been incorporated into Version 0.6. The ill-fated Version 0.7 27. (Here's a change that I retracted shortly after making it, since I discovered that the source was flaky after all; and I also found a reliable source [NBS Circular 570] confirming my original information. I include the note here only for historical purposes...) "After years of searching, I've finally found a definitive definition of the printer's point; and (unfortunately) my previous conjecture was wrong. The truth is that 83pc=35cm, exactly; so I am changing TeX to conform. This means some changes in the comments of modules 101 and 517, and the following changes to the program: "27a. In modules 547 and 571, the appropriate DVI numbers are now: dvi_four(109375); dvi_four(2039808); {conversion ratio for sp} "27b. The guts of module 418 become: if scan_keyword("in") then set_conversion(63246)(875) else if scan_keyword("pc") then set_conversion(12)(1) else if scan_keyword("cm") then set_conversion(996)(35) else if scan_keyword("mm") then set_conversion(498)(175) else if scan_keyword("bp") then set_conversion(10541)(10500) else if scan_keyword("dd") then set_conversion(996)(931) else if scan_keyword("cc") then set_conversion(11952)(931) else..." *** Version 0.7 of TeX incorporated the changes above (82/10/30); this version was withdrawn on 82/11/2. Changes subsequent to Version 0.6 28. The experience with #27 did lead me to one improvement, thanks to Chuck Bigelow, with respect to Didot points. (11/4/82) Add the following comment to module 418: According to the definitions here, $\rm2660\,dd\approx1000.33297\,mm$; this agrees well with the value $\rm1000.333/,mm$ cited by Bosshard in {\sl Technische Grundlagen zur Satzherstellung\/} (Bern, 1980). And change two lines of the code there as follows: else if scan_keyword("dd") then set_conversion(1238)(1157) else if scan_keyword("cc") then set_conversion(14856)(1157) 29. The new font material is made more robust by ensuring that \the\font always returns a pointer to a control sequence whose command code is set_font. (Change 11/4/82) 29a. The code changed in 26aa is changed again, to the following: ; define(u,set_font,undefined_font); scan_optional_equals; scan_file_name; ; ; f:=read_font_info(u,cur_name,cur_area,s); common_ending: equiv(u):=f; geq_define(hash_used,set_font,f); font_ident[f]:=hash_used; exit:end; 29b. Instead of 26cc, here's the new module 1173: We reserve a special control sequence for the font identifier; this one cannot be redefined by the user, so it is safe to return it as a value of \the\font. = get_token; if cs_ptr0 then eq_word_define(int_base+looseness_code,0); if hanging_indent<>0 then eq_word_define(dimen_base+hanging_indent_code,0); if par_shape_ptr<>null then eq_define(par_shape_loc,shape_ref,null); end; 31. Module 403, replace line 5 (11/6/82): if cur_tok+= let: begin get_token; if cs_ptr<>0 then else begin print_nl ("! You can use \let only with control sequences"); help2("I'm not \let-ting anything change here,") ("since I can only do things like `\let\a=b'."); back_error; end; end; 33b. Module 1142 becomes: = begin p:=cs_ptr; repeat get_token; until cur_cmd<>spacer; if cur_tok=other_token+"=" then begin get_token; if cur_cmd=spacer then get_token; end; if cur_cmd>=call then add_token_ref(cur_chr); define(p,cur_cmd,cur_chr); end 34. This change helps you see an undefined control sequence in certain unusual cases (discovered by JDH, 11/8/82): Add the clause "(base_ptr=input_ptr) or" to module 294, line 2. 35. Here's an improvement in the formula for demerits; previously more weight was given to minimizing bad spacing on lines with penalties, so that (slightly loose hyphenated line)(OK line) was considered worse than (OK hyphenated line)(quite loose line). (fixed 11/8/82) Change lines 2--7 of module 772 to the following: d:=line_penalty+b; d:=d*d; if pi<>0 then if pi>0 then d:=d+pi*pi else if pi>eject_penalty then d:=d-pi*pi; 36. Minor change to save buffer space in non-INITEX (11/10/82): Enclose the declaration of pool_file in module 50 by init...tini. 37. Minor improvement in format for the context of error messages (11/13/82): 37a. Module 289, type "inserted" split into "backed_up=3", "inserted=4" and the other type numbers increase: "macro=5", etc. 37b. In module 296, backed_up: if loc=null then print_nl("") else print_nl(" "); inserted: print_nl(" "); 37c. Minor changes to comments in modules 289 and 293. 37d. Change "inserted" to "backed_up" in module 294. 37e. Add definition "back_list(#)==begin_token_list(#,backed_up)" in module 305. 37f. In module 306, first test should be ">=backed_up", second "<=inserted". 37g. Change ins_list to back_list in modules 307, 318, 375, 1195. 37h. Add definition to module 308: ins_error==begin back_error; token_type:=inserted; end 37i. Change back_error to ins_error in modules 362, 1040, 1046. 37j. Change "" to "" in module 973 help. 38. Module 407, the error message is changed (11/11/82) to: "! Missing number, treated as zero". 39. Fix anomaly when hbadness or vbadness is small (11/11/82): Module 593, line 2, "if (-x-total_shrink[normal]>hfuzz) or (hbadness<100)" Module 603, line 2, "if (-x-total_shrink[normal]>vfuzz) or (vbadness<100)" 40. Added the \tokens primitive (11/13/82): In module 223, defined tokens_loc and tokens (analogous to every_par). In module 225, defined the primitive. In module 1146, changed the comment to include tokens_loc as a possibility. 41. Change get_nc_token to get_token in module 374 (11/13/82). (In particular \def\foo{...}\foo won't say "undefined c.s." now!) (This change later retracted during debugging; it was found that "endv" aborts the job, so this cure was worse than the disease. Then it was re-established as part of the major change to conditionals, because endv needed to be more robust anyway.) 42. In module 699, we make \span expand in a preamble (11/13/82). Change lines -7 through -3 to: begin get_nc_token; goto reswitch; end; 43. Modules 321 and 322 have been altered for better efficiency (11/12/82) and better exposition; the three conditions of module 322 are now in separate if tests. 44. Frozen control sequences are now unredefinable. (11/16/82) A new procedure get_r_token has been introduced to give uniform error messages for \def, \let, \read, \font, \mathchardef, and to make them incapable of changing the frozen equivalents. Incidentally, get_nc_token is changed to get_x_token; and ch_code becomes cat_code. A major change (Version 0.8) made on November 14--16: Conditional statements are taken from semantics to syntax. This change, which counts as number 45 on the list, made it necessary to renumber the modules. And it was such a drastic change, the differences can only be sketched here, using the old module numbers for reference. A variety of other things were cleaned up because this change made it more natural for them to be handled differently. 45a. Module 158, inserted a permanently empty token list called null_list. 45b. Module 204, deleted if_test, case_branch, else_code, convert; inserted end_cs_name. 45c. Module 206, inserted if_test, fi_or_else, cs_name, convert, and end_template (the latter comes after long_outer_call). 45d. Module 217, there are now nine frozen control sequences; also null_cs. 45e. Modules 247 and 248, must be able to print a null control sequence. 45f. Module 268 (leave_transparent_group) disappears; comments in the previous modules also are appropriately simplified. 45g. Module 273, delete endv_token. 45h. Modules 277 and 278, delete references to endv (it no longer appears). 45i. After module 281, a procedure show_cur_cmd_chr takes the code for tracing commands from module 937. 45j. Module 317 now forbids \outer control sequences when skipping, and inserts \fi in front of them, for error recovery. 45k. Module 334 now uses null_cs if carriage-return is an escape. 45l. Module 343 no longer has endv test. 45m. Module 344, major extensions to expand_calls make it several modules longer. It saves global variables like cur_val. It changes end_template to endv. It processes cs_name and convert. It processes if_test by calling the "conditional" procedure. It processes fi_or_else by checking their legality, and (if legal) updating the if stack. 45n. Module 373 (pass_block) disappears. 45o. After module 400, radix and cur_val and cur_val_level are initialized. 45p. Module 428 changes so that conv_toks is a procedure rather than a function; this procedure is invoked by expand_calls. 45q. Modules 436 and 1032, delete reference to conv_toks. 45r. After module 443, the entire part 48 moves to this part of the program, and the parts are renumbered accordingly. \case is changed to \ifcase, and it resides under the if_test command. New routines are inserted to maintain a linked stack that records the current state of conditionals. There's a procedure pass_text that skips text while looking for \fi or \else or \or on level zero with respect to \if...\fi nesting. The previous routines for skip control via handle_right_brace are eliminated, and the new ones are somewhat simpler. The new \ifcat is mostly combined with the old \if; they no longer ignore spaces. The scanner_status is set to normal while processing \ifx. \ifx will consider \a to equal 0 after \let\a=0. 45s. Modules 701, 707: endv_token is replaced by a token for a frozen control sequence whose command code end_template makes it behave like an outer_call. After expand_calls, it is converted to another frozen control sequence, whose command code is endv. This two-step facilitates error recovery, instead of giving a fatal error stop. 45t. Module 874, remove "pass_block(1); goto done". 45u. After module 1047, routine for end_cs_name prints an error message. 45v. Module 1049, get_nc_token becomes get_token. (else $\ifmmode fails) 45w. Module 1202 gets another case (end_template). 45x. Module 1243, new warning is printed if the if stack isn't empty. Changes after version 0.8 46. Declare c : ascii_code in module 825 (noted by DRF, 11/21/82) 47. Module 776 lines 4-6 (suggested by DRF, 11/21/82) threshold:=pretolerance; if threshold>=0 then begin stat if tracing_stats>2 then begin begin_diagnostic; print_nl("@@firstpass"); end; tats second_pass:=false; end else begin threshold:=tolerance; second_pass:=true; end; 48. Protection for DVI files (added 11/16/82) Replace lines 2 and 3 of module 570 by: ; Move the statement "dead_cycles:=0" from module 570 to module 568. Declare "label done;" in module 568. And add the following new module after 570: @ Sometimes the user will generate a huge page because other error messages are being ignored. Such pages are not output to the \.{dvi} file, since they may confuse the printing software. @= if (height(p)>max_dimen)or(depth(p)>max_dimen)or(width(p)>max_dimen) then begin print_nl("! Huge page cannot be shipped out"); help2("The page just created is more than 18 feet tall or")@/ ("more than 18 feet wide, so I suspect something went wrong."); error; if tracing_output=0 then begin begin_diagnostic; print_nl("The following box has been deleted:"); show_box(p); end_diagnostic(true); end; goto done; end; if height(p)+depth(p)>max_v then max_v:=height(p)+depth(p); if width(p)>max_h then max_h:=width(p) 49. New features \everymath and \everydisplay (12/2/82). Make changes analogous to those for "\tokens" (see change 40). Put the following just before the end of module 1050: if every_math<>null then begin_token_list(every_math,every_math_text); And put the following just before the end of module 1056: if every_display<>null then begin_token_list(every_display,every_display_text); 50. New feature \futurelet (12/2/82): Module 1141 changes again. (Also, "let" and "futurelet" share cmd code "let".) let: begin n:=cur_chr; get_r_token; p:=cs_ptr; if n=normal then begin repeat get_token; until cur_cmd<>spacer; if cur_tok=other_token+"=" then begin get_token; if cur_cmd=spacer then get_token; end; end else begin get_token; q:=cur_tok; get_token; back_input; cur_tok:=q; back_input; {look ahead, then back up} end; {|back_input| doesn't affect |cur_cmd|, |cur_chr|} and continue with "if cur_cmd>=call", as before. *** The changes above have been incorporated into version 0.9 of TeX. Changes after version 0.9 51. new \endinput primitive (suggested by FY, 12/7/82): \input and \endinput both use the same command code. The cases in module 955 are deleted and replaced by those in module 965 (which disappears), because \input is now allowed in any mode. The code for any_mode(input) is "if cur_chr=0 then start_input else force_eof:=true", and it moves from module 952 to just before module 1197. The global variable force_eof is initially false, and module 340 becomes (after first:=start;) if not force_eof then begin if input_ln.... else force_eof:=true; end; if force_eof then begin print_char(")"); force_eof:=false;... 52. Module 1005, line 4 (12/8/82) change "if align_state<0" to "if (mode<0)or(align_state<0)" (This avoids embarrassing case where TeX says "type a command or say \end" but when you type \end it says "You can't use \end in restricted horiz mode".) 53. Patch to the new code for \csname (12/21/82) After eq_type(cs_ptr):=relax, also say equiv(cs_ptr):=256. (This corrects a bug that would appear only if \csname occurs right after a file name.) 54. Change 47 introduced a bug when tracingonline=0 (12/20/82) when omitting firstpass, also do "if tracing_stats>2 then begin_diagnostic;" 55. \hskip -1pt plus 2pt was parsed as \hskip -(1pt plus 2pt)! (12/20/82) In module 421, before line -4, insert the following: if negative then begin cur_val:=-cur_val; negative:=false; end; But then realize that "negative" is always false on line -2; simplify. 56. Cosmetic change to paragraph statistics (12/23/82) tight_fit..very_loose_fit codes have been renumbered very_loose_fit..tight_fit. 57. Module 729 changes to make TeX language more consistent (12/23/82): else if type(tail)<>glue_node then tail_append(new_penalty(inf_penalty)) else begin type(tail):=penalty_node; delete_glue_ref(glue_ptr(tail)); flush_node_list(leader_ptr(tail)); penalty(tail):=inf_penalty; 58. Commas are allowed as alternates to radix points. (12/23/82) define continental_point_token=other_token+"," {decimal point, Eurostyle} in module 400, and insert the following twice in 409: if cur_tok=continental_point_token then cur_tok:=point_token; 59. \hangindent becomes a normal parameter. (12/23/82) This simplifies the code in obvious ways; for example, module 1148 disappears. The command code hang_indent goes away too; what was previously called hanging_indent is then renamed hang_indent. 60. \prevgraf becomes accessible. (12/23/82) This involves renaming the "after" field "pg_field" in the nest array; making a new command code set_prev_graf; including the following loop into scan_the: nest[nest_ptr]:=cur_list; p:=nest_ptr; while abs(nest[p].mode_field)<>vmode do decr(p); scanned_result(nest[p].pg_field)(int_val); and including the following active procedure for any_mode(set_prev_graf): procedure change_prev_graf; var p:0..nest_size; {index into |nest|} begin nest[nest_ptr]:=cur_list; p:=nest_ptr; while abs(nest[p].mode_field)<>vmode do decr(p); scan_optional_equals; scan_int; if cur_val<0 then begin print_nl("! Bad \prevgraf"); help1("I allow only nonnegative values here."); int_error(cur_val); end else begin nest[p].pg_field:=cur_val; cur_list:=nest[nest_ptr]; end; end; 61. \clubpenalty is split off from \widowpenalty. (12/23/82) 62. Bad bug in module 1005 (12/24/82) (must not go to reswitch if \par is a macro!) Instead of setting cur_cmd and cur_chr and goto reswitch, just back_input and set token_type:=inserted. 63. \openin not to prompt if file not present (12/25/82) Change lines -4 and -3 of module 1183 to: if a_open_in(read_file[n]) then read_open[n]:=just_open else read_open[n]:=closed; 64. New \jobname primitive (12/25/82) It is added to the "convert" command in the obvious way. In conv_toks, the relevant code is if job_name=0 then open_log_file before "selector" is changed and print(job_name) after. 65. Better error recovery for math-only things (12/25/82): In module 952, don't goto reswitch after insert_dollar_sign. In module 954, first back_input, then set cur_tok, and don't bother to set cur_chr or cur_cmd; ins_error instead of back_error. 66. Module 1163, line 3, insert "scan_optional_equals" (12/25/82). Also make \the\parshape allowed. 67. The location where an \if begins is stacked (12/26/82) so that a better error message can be given for \end while \if is incomplete. This means two-word nodes instead of one-word nodes in the if stack. 68. Change 30 is extended to \insert, \vadjust, \valign, \output (12/26/82) The one-time-only paragraph parameters are now cleared by a subroutine called normal_paragraph; hang_after is also set to 1. The essential change being made now is to call normal_paragraph in modules 704, 932, 1009, and 1076. 69. \pagetotal and \pagegoal are added (12/27/82) The changes are analogous to, but simpler than, those for \prevgraf. 70. Tracing of page-optimization calculations (12/27/82) A bunch of print commands are added to modules 897, 914, and 918, activated if tracing_pages>0. Also, \tracingparagraphs is separated from \tracingstats. **** The changes above have been incorporated into version 0.91 of TeX 71. The build_page procedure is broken in two parts (Dec 31, 1982) by making module 919 into a procedure called fire_up. 72. \ifeven1\else is made legal by introducing if_code (Dec 31, 1982) This improves part of the code in change 45; if_limit has a specific value that recovers automatically from a former syntax error. 73. Improvement to alignments when columns don't occur (Dec 31, 1982) Delete module 711; and where it was used in module 708, say this: begin fin_col:=true; return; end; Also, in module 717, replace the statement "width(q):=0" by "" where that new module has the following code: begin width(q):=0; r:=link(q); s:=glue_ptr(r); if s<>zero_glue then begin add_glue_rel(zero_glue); delete_glue_ref(s); glue_ptr(r):=zero_glue; end; end 74. Better error message in overfull alignment (Dec 31, 1982) In module 717, don't set both height and width; set the height zero. Then in module 719, switch width to height if necessary. (People didn't understand the previous error messages, and I couldn't blame them.) *** The changes above have been incorporated into version 0.92 of TeX82 *** (which was the last version of 1982, completed 11:59pm on December 31) The first changes after 1982 75. Modules 961 and 962 should be one module. (Jan 3, 1983) Also, the absolute constant 100 is replaced, and the test becomes if ((page_head=page_tail)and(head=tail)and(dead_cycles=0))or (dead_cycles>max_dead_cycles) then 76. Surprise bug: module 1010. (Jan 3, 1983) The case "if head<>tail" needs an else clause: else pop_nest. Also remove the "" in that module. 77. Improvement to change 22 (Jan 4, 1983) In module 996, use box_max_depth from inside the \vbox: @!d:scaled; {maximum depth} begin d:=box_max_depth; unsave;... vpackage(...,d); 78. \groupbegin and \groupend changed to \begingroup and \endgroup (Jan 4, 83) 79. \deadcycles made accessible (Jan 4, 83) 80. New calculations for split insertions (Jan 4, 83) In module 918, we now work with natural width, and add in the page depth too: The line "else w:=x_over_n..." is changed to else begin w:=page_goal-page_total-page_depth; if count(n)<>1000 then w:=x_over_n(w,count(n))*1000; end; (Note that cur_page_height and cur_page_depth and page_size have been renamed page_total, page_depth, and page_goal, in accordance with new syntax.) *** The changes above have been incorporated into Version 0.93 81. Old bug finally unearthed by PHY (Jan 6, 1983) insert "incompleat_node:=null;" after "push_nest;" in module 1097. 82. Extension of change 69: \pageshrink, etc. added (Jan 6, 1983) 83. \floatingpenalty and \insertpenalties added (Jan 6, 1983) Also, the insertion nodes now have a new format, so that the values of \floatingpenalty, \splittopskip, and \splitmaxdepth can be stored with each insertion; this requires the obvious changes in several places: a) Module 136, ins_node has fields float,depth,height,ins_ptr,split_top_ptr b) Module 184, these fields are displayed c) Module 198, ins_node case, also delete_glue_ref(split_top_ptr(p)) d) Module 202, ins_node case, also add_glue_ref(split_top_ptr(p)) e) Modules 226-228, new integer parameter \floatingpenalty f) Module 883, add parameter d to vert_break subroutine g) Module 885, use d instead of split_max_depth h) Module 890, argument split_max_depth to call of vert_break i) Module 894, change width to height (better name) j) Module 900, initialize insert_penalties here, not in 901 k) Module 914, cost to be awful_bad if insert_penalties>=10000 l) Module 916, add float(p) to insert_penalties if type(r)<>inserting m) Module 916, subtract page_depth from delta n) Module 918, subtract page_shrink from delta o) Module 918, argument depth(p) to call of vert_break p) Module 921, insert_penalties:=0, save split_top_skip before calling 925 q) Module 921, restore split_top_skip before calling 924 r) Module 928, set split_top_skip:=split_top_ptr(p) before prune_page_top s) Module 929, after q:=p, incr(insert_penalties) t) Module 929, before free_node, delete_glue_ref(split_top_ptr(p)) u) Module 933, clear insert_penalties before calling 934 v) Module 978, more local variables needed w) Module 1010, build the newfangled ins_node 84. Scanner goes to new_line when is category 13 (Jan 7, 1983) Insert state:=new_line in module 323 just before the reference to module 339; and delete "state:=new_line;" from modules 328 and 330 (and their names). 85. Distinguish between user \kern and font \kern (Jan 9, 1983) The nontrivial parts of this are to change "type(s)<>kern_node" to "(type(s)<>kern_node)or(subtype(s)<>normal)" in modules 809 and 810; and to say "kern_node: if subtype(s)=explicit then goto done4" in module 812. The \kern primitive now has "explicit" instead of "normal" in 967. 86. "ignorespace" becomes "ignorespaces" (Jan 9, 1983) 87. Don't omit a blank space after \def, \message, \mark, etc. (Jan 9, 1983) is removed from modules 431, 848, 874. "info(r):=space_token;" and "link(r):=get_avail; r:=link(r);" removed from 1278. *** The above changes appear in Version 0.94. Version 0.95 88. New active characters in math mode (Jan 12, 1983) In module 1062, add a label "restart" and change lines -3 and -2 as follows: fam(p):=(c div 256) mod 16; if c>=var_code then if fam(p)<8 then fam(p):=cur_fam else begin ; goto restart; end; In module 1064, the body of the procedure becomes begin if c>='4000 then else ; end And there's a new module: = begin cs_ptr:=(c mod 128)+active_base; cur_cmd:=eq_type(cs_ptr); cur_chr:=equiv(cs_ptr); x_token; back_input; end 89. Surprise bug: $1-$ treated the - as binary (Jan 15, 1983) New module = if r_type=bin_noad then type(r):=ord_noad is called in module 649 before the call of 678, and in module 651 in the place where that code already appears. 90. Another oversight (Jan 15, 1983) Add "space_factor:=1000;" after "push_nest" in modules 1027, 1029 91. And a more embarrassing one (Jan 16, 1983) I forgot "spotless:=false;" at the beginning of the procedure in module 80. But while fixing this, I decided to make it more general since IBMers want a return code at the end of the job. So there's a history variable that has four values: spotless, warning_issued, error_message_issued, fatal_error_stop. a) module 75: declare history, define spotless etc. b) module 76: initialize history:=spotless c) module 80: if history= begin print_nl("! Unbalanced \output routine"); help2("Your sneaky output routine has fewer real {'s than }'s.")@/ ("I can't handle that very well; good luck."); error; repeat get_token; until loc=null; end In module 1278, replace the call on confusion by a call of: @ @= begin print_nl("! Unbalanced \write command"); help2("On this page there's a \write with fewer real {'s than }'s.")@/ ("I can't handle that very well; good luck."); error; repeat get_token; until cur_tok=end_write_token; end 93. String overflow clobbered the log file (Jan 18, 1983) Also, "confusion" before log file open would cause problems. Also start_input calling open_log_file calling prompt_file_name calling fatal_error! To fix these anomalies, open_log_file no longer calls prompt_file_name, if interaction0 then selector:=term_and_log else selector:=term_only; if interaction=batch_mode then decr(selector); if job_name=0 then open_log_file; end; 94. \ifeof\fi loops infinitely (Jan 18, discovered by Lamport) Change 72 converted such a \fi to \fi. Now it is converted to \relax\fi. 95. \limitswitch changed to \displaylimits et al. (Jan 18, 1983) [Incidentally, this fixes a bug in the former positioning of \int\limitswitch] a) module 608: subtype of Op can be normal, limits, or no_limits. b) 620: display the subtype if not normal c) 667: new logic decides limits before looking at the operand (and the operand is now called the nucleus); the italic correction is removed only if it should not be put back d) 1069: subtype(tail):=cur_chr 96. Minor changes to math in unusual cases (Jan 19, 1983) a:delete "if height(y)<=0 then height(y):=default_rule_thickness" in module 658 b:move "if thickness(q)=default..." from module 664 to module 661 c:delete module 1081, that error message isn't worth the bother d:in module 1062, char_num case, c:=math_code(cur_val) (if cur_val<128) e:in module 1064, a similar change 97. Bad spacing from change 6 is corrected (Jan 19, 1983) underline, overline, radical, vcenter, and accent noads now revert to type Ord instead of type Inner. {...} produces type Ord also. There's a new primitive \mathinner. The new_noad function now produces an ord_noad (change its calls accordingly). And the default is changed in module 679 to t:=ord_noad; the fraction_noad case sets t:=inner_noad, and the (inner_noad,ord_noad) cases swap places. 98. New \mathchoice primitive (Jan 19, 1983) a) module 204: new command b) 254: math_choice_group c) 614: style node three words long, so a choice node can be converted to it d) 614a: choice node has four subfields: display_mlist, text_mlits, etc. e) 1081a: routines to build a choice_node like 1027-1029 build discretionaries 99. \input moves to syntax from semantics (Jan 19, 1983) a) 204, 206: renumber commands b) When input is to be expanded, if name_in_progress then insert_relax c) 459,464: name_in_pr:=true; begin_name;...end_name; name_in_pr:=false; d) 406,461: declare name_in_progress, a global boolean initially false 100. \chardef joins \mathchardef (Jan 19, 1983) a) 204: math_only becomes math_given; add new command char_given b) 205: new command char_def c) 250,251: new primitive char_def d) 380: char_given,math_given yield integer after \the e) 401: char_given,math_given yield integer in context of integer f) 936,943: char_given treated like other_char g) 1062,1064: same, if cur_chr<128, else assume math_code(x)=x h) 1143,1144: char_def is analogous to math_char_def 101. \unbox becomes \unhbox,\unvbox; also add \unhcopy (Jan 19, 1983) Module 1020 changes in the obvious way. 102. \spacefactor, \pagetotal, etc. move to prefixed_command (Jan 20, 1983) 103. \hrule in horizontal mode, \vrule in vertical mode: switch modes (Jan 20) 104. \globaldefs parameter, affects prefixed_command (Jan 20, 1983) 105. After looking at frequency counts, some optimizations made (Jan 21, 1983) a) "fast_get_avail" and "fast_store_new_token" introduced to speed up the loops in modules 360 and 431. b) some procedure call overhead eliminated in begin_token_list, end_token_list, back_input, and flush_node_list. c) a few if tests changed from "if a and b then" to "if a then if b then". 106. Changes for space efficiency in math constructions (Jan 22, 1983) a) In module 1102, mlist_penalties:=(mode>0) b) The following code is inserted before "free_node" in module 639 (rebox): if (is_char_node(p))and(link(p)=null) then begin f:=font(p); v:=char_width(f)(char_info(f)(character(p))); if v<>width(b) then link(p):=new_kern(width(b)-v); end; c) A new module is called just before clean_box exits: = q:=list_ptr(x); if is_char_node(q) then begin r:=link(q); if r<>null then if link(r)=null then if type(r)=kern_node then begin free_node(r,small_node_size); link(q):=null; end; end 107. Oversight in rebox routine (module 639) corrected (Jan 22, 1983) if type(b)=vlist_node then b:=hpack(b,natural); 108. Module 217 clobbers eqtb[bad_font_ident] set in change 26q (Jan 22, 1983) Decided to fix this by making \nullfont a primitive. This means the procedure missing_font can be deleted, and the test for undefined font can be removed from the inner loop. (This reflects a rather dramatic change from TeX80, where a missing font was a fatal "Whoa" error!) Note: I thought I could delete module 646, but realized that it still provides a useful error message. The dump/undump routines (cf. change 26ee) now dump the null_font information too, as its parameters can be changed. 109. End of program now lists all incomplete \ifs (Jan 24, 1983) 110. Alignment preamble setup to allow \halign\lb (Jan 29, 1983) The statement "align_state:=-1000000;" is inserted near the beginning of module 695 (and the comment about align_state=-999999 is deleted). The constant -999999 is changed to -1000000 in modules 700 and 701. 111. Forgot to test is_char_node(r) (Jan 30, 1983) in the code of change 106c. By coincidence, this was caught since somebody used font number 11 in the second character of a list of length 2! 112. Improved format for stats at end of run (suggested by DRF, Jan 30, 1983) Module 1242 changes; nothing subtle. **** The changes above have been incorporated into version 0.95 Version 0.96 113. space after one-symbol control sequences NOT to be ignored unless the catcode of that symbol is letter or spacer. (Jan 30, 1983) The name of module 334 changes slightly; the state is set based on cat_code(cur_chr), shortly after label start_cs. A new variable cat is introduced and set to cat_code(cur_chr) in modules 334 and 336. 114. trailing spaces removed on all lines of input (Jan 30, 1983) last_nonblank is added to input_ln routine (module 31) 115. mmode+accent gives error but assumes math_accent (Feb 3, 1983) This goes into math_ac procedure (module 1075); module 1035 is eliminated. 116. \iftrue and \iffalse (Feb 5, 1983) Simple addition of two new conditions. 117. Bad calculation of size for \left and \right (Feb 6, 1983) In module 680, the first assignment to delta should be delta:=(delta1 div 500)*delimiter_factor. 118. \delimitershortfall (new name) replaces \delimiterlimit. (Feb 12) 119. \abovewithdelims.. to be equivalent to \above (Feb 12) Module 1089 revised so that the delimiters are scanned before the dimension. 120. Remove the kludgy math codes introduced in change 88 (Feb 12) \fam becomes a normal integer parameter and \mathcode stored with min_halfword added and \mathcode allowed to be 32768 and current family is substituted only when it's in range. Also the initialization of mathcode for letters now specifies family 1. (This implies a dozen or so obvious revisions.) 121. Bug in module 1152: max spacefactor is 32767 (Feb 12) also module 1013 gets a restricted range 122. Octal output to be replaced by hexadecimal. (Feb 14) 123. Forgot to include char_given in module 1037, re change 100 (Feb 14) 124. vmode+valign,hmode+halign made legal transitions (Feb 17) 125. \tracingrestores (Feb 18) This involves a lot of new, rather tedious code that's interspersed with the eqtb definitions (the body of a procedure called show_eqtb). 126. New error message for hmode+hrule in -hmode. (Feb 25) head_for_vmode now suggests \leaders in this case. [improves change 103] 127. under/overfull boxes in alignment: Better message. (Feb 27) par_begin_line becomes pack_begin_line, and it is set (negative) in module 719, read in modules 590 and 601. 128. New \xcr feature. (suggested by Lamport comments, Mar 4) align_peek (module 702) ignores it, otherwise it acts like ordinary \cr. 129. In stats, subtract out TeX's own string requirements (Mar 4) (cf. change 112) init_pool_ptr and init_str_ptr variables added in obvious way (declared in module 39, set in module 1240, used in module 1242) 130. \everyhbox and \everyvbox. (Mar 6) The modifications are obvious; for example, module 1076 gets the statement if every_vbox<>null then begin_token_list(every_vbox,every_vbox_text); and a similar pair of statements goes into module 993. 131. Precaution in module 1105 error recovery (March 9, 1983) Change the first test to "if (a=null)or danger", in order to avoid accessing math_quad when the symbol fonts aren't known to be present. 132. Installed float and unfloat to aid portability (suggested by HWT, 3/7/83) 133. \dispskip becomes \abovedisplayskip and \belowdisplayskip (3/9/83) Also \dispaskip becomes \abovedisplayshortskip; \dispbskip similar. 134. \romannumeral separated from \number (suggested by FY, March 10) Obvious changes; print_roman_int now accepts negative input but gives no output in such cases (the test in module 68 becomes "if n<=0 then return"). 135. scan_keyword to ignore leading spaces (Mar 12) In module 375, change "else begin" to "else if (cur_cmd<>spacer)or(p<>backup_head) then begin". 136. Update to change 112 (Mar 14) Module 1242 now uses write and write_ln directly (saves space and time). 137. Another change to page-break cost (suggested by Lamport, March 16) Cf. change 83k above; the relevant lines of module 914 now read if b=10000 then c:=awful_bad; and a similar change (but without insert_penalties) occurs in module 887. **** The changes above have been incorporated into version 0.96 (March 16, 1983) Version 0.97 138. \everyjob (suggested by FY, March 18) Module 936: main_control inserts every_job as its first action. 139. Improved printout of macro definitions (March 19) In module 278, simply treat left_brace like right_brace. (This corresponds to the way the manual describes parameter matching.) 140. Omit blanks as non-delimited parameters (March 19) In module 360, replace else store_new_token(cur_tok); by else @; Then define @ to be: begin if cur_tok=space_token then if info(r)<=end_match_token then if info(r)>=match_token then goto continue; store_new_token(cur_tok); end 141. Minor patch in module 386, catches mu_glue (March 21) begin cur_val:=zero_glue; cur_val_level:=glue_val; if not is_char_node(tail)and(mode<>0) then begin if type(tail)=glue_node then begin cur_val:=glue_ptr(tail); if subtype(tail)=mu_glue then cur_val_level:=mu_val; end; end else if (mode=vmode)and(tail=head)and(last_page_glue<>max_halfword) then cur_val:=last_page_glue; end 142. Patch in module 699, \span expands only one level (March 21) (See previous change #42.) The "get_x_token" in the code while (cur_chr=span_code)and(cur_cmd=tab_mark) do get_x_token; should be replaced by: begin get_token; if cur_cmd>max_command then begin expand_calls; get_token; end; end 143. Single # in \tokens, \message, etc. (March 22) (The previous rule was really bad in connection with \uppercase, or with \write when #'s had to be given four times!) Module 437 should be prefaced with "if macro_def then". And get_token should become get_x_token there, if xpand is true. 144. Keyword "to" required in \read. (March 22) This will avoid the common error of a missing space before the \cs. Also the stream number can be out of range, for terminal input. The stream number in a \write can be out of range too, for terminal output. Modules 1145 and 1258 and 1280, etc., change in the obvious ways. 145. \ifeven replaced by \ifodd (March 26) This makes the language more consistent. 146. Big surprise bug relating to \if\if aabc\fi (March 26) (related to change 45; the possibility that cur_if might not be the correct one when the conditional is evaluated was discovered today) The main change is to add the change_if_limit procedure, and to add the variable save_cond_ptr and the code that now depends on it. 147. \if and \ifcat should tolerate primitives (March 28) 148. "absent" becomes "void", a better word (March 28) 149. Module 990: \lastbox to clear the shift_amount (March 28) since I don't want to figure out what it means in all cases (\vsplit, etc) 150. print_err("...") takes the place of print_nl("! ...") (DRF, March 29) And wake_up_terminal is introduced in module 34, and used in modules 37, 70, 341, 441, 457, 463, 1210, 1240, 1246. 151. \halign extended to periodic preambles (April 1) Modules 688--690: cur_loop introduced, stacked/unstacked Module 695: cur_loop initialized Module 700: cur_loop set up Module 708--709: cur_loop used and advanced 152. \leaders to align by the smallest enclosing box. (April 1) Module 549: new local variable left_edge, initialized to cur_h Module 557: cur_h:=left_edge+leader_wd*((cur_h-left_edge) div leader_wd) Module 559: new local variable top_edge, initialized to cur_v-height(this_box) Module 566: analogous to 557 153. hyphenation after whatsits is OK (April 1) In module 809, skip past whatsits 154. \par in vertical mode should build_page (April 2) vmode+par_end moves from 952 to 1005 155. Clear aux to zero in module 703 (April 2) 156. Digits will switch families (April 4) (initialize their math codes differently in module 225) 157. Refinement to correction 83m (April 7) the test for not splitting should be if ((h<=0)or(h<=delta))and(height(p)+height(r)<=dimen(n)) then 158. (re 128) \xcr renamed to \crcr, at Lamport's request. (April 8) 159. Better error recovery in runaway preamble (April 11) Module 319, aligning: set align_state:=-1000000 160. \read to get balanced braces (April 12) Module 440 changed to look more like 431. Module 443 gives error message if the \read goes off end of file. Module 319 removes \outer from forbidden control sequence that is \read. 161. Bug found by Jim Sterken (April 14) Module 798 can make q a char_node, so module 794 needs this patch: if not is_char_node(q) then to be inserted just before "if (type(q)=math_node)..." 162. \uppercase and \lowercase to apply to all characters (April 15) module 1196 changes; also I put active_base before single_base in eqtb **** The changes above have been incorporated into version 0.97 (April 16, 1983) **** except the part of 144 about \read-1 was forgotten and put in 0.98 later Version 0.98 163. change small_number to 0..65 in module 814 (found by DRF, April 17) 164. improved error recovery in module 1166 (suggested by DRF, April 17) after error: repeat get_token; until cur_cmd=right_brace; {flush the patterns} 165. improved \read from terminal (suggested by Todd Allen at Yale, May 1) I had forgotten to implement the extended stream numbers in change 144. Also, the prompt is now omitted if n<0. 166. \write n writes only to the log file, if n<0. (May 18) 167. Unified syntax for parameters and registers. (May 18) a) Command code changes: def_font moved to before prefix; register eliminated; set_register renamed register and moved (with adv_register...div_register) to before prefix; min_internal and max_internal defined. b) scan_the renamed scan_something_internal, and it acts on cur_tok. c) scan_int, scan_dimen, scan_glue simplified accordingly; instead of testing for cur_cmd=the or cur_cmd=register, they now test cur_cmd versus min_internal and max_internal. d) ins_the is removed. e) \minusthe is removed. Consequently "the_toks" needs no parameter. 168. new parameters \hoffset, \voffset (May 18) 169. \everycr (suggested by Spivak, installed May 24) 170. \countdef, \dimendef, etc. (suggested by DRF long ago, installed May 25) Straightforward change to internal representation of assign_int and similar commands, so that the chr part is now a pointer to the eqtb location. 171. \advance, \multiply, \divide (suggested by FY, installed May 25) 172. \hyphenchar (May 25) A new command assign_font_int is introduced, and incorporated into scan_something_internal and prefixed_command in the usual way. The hyphen_char array entries are initialized in modules 483 and 506, allocated in 482, used in modules 809 [is hyphenation to be suppressed?], 828 [insert the hyphen character], 946 [insert discretionary node following hyphen], 1027 [implementation of \-]. hyphen_char[k] is dumped and undumped in modules 1229 and 1230. 173. \skewchar (May 25) Loaded and fetched with the same command code as \hyphenchar. Module 659 gets a dozen more lines of program, to compute the skew. 174. \noexpand (May 25) This involves: introduction of no_expand and dont_expand command codes; frozen_dont_expand as an internal marker; small change to get_next when that marker is sensed; change to processing of \if and \ifcat; implementation of no_expand in the expand_calls subroutine. I also changed the name of expand_calls to "expand". 175. \meaning (May 25) This adds one case to the "convert" command. print_meaning is a new subroutine, using code that was in show_whatever. 176. "dm" and "vu" are out, ".5\hsize" is in (May 25) Straightforward changes to module 416. 177. \texinfo f n becomes \fontdimen n f (May 25) 178. \afterassignment (suggested by ARK, May 27) 179. \chardef\xx=5\xx shouldn't say that \xx is undefined (May 27) 180. \relax to be ignored like spaces in math mode (May 28) and in a few other places: is now used in modules 379, 988, 994, 1062, 1070, 1134, 1179 (i.e., scan_left_brace, scan_box, scan_math, scan_delimiter, prefixed_command, do_assignments, and just after \leaders). 181. improve \mathaccent wrt sub/superscripts (sugg by HWT, May 30) 182. its_all_over: remove dead_cycles>max_dead_cycles (May 30) Modules 961 and 962 are combined and simplified. *** The changes above were installed into version 0.98 on May 31, 1983 *** Version 0.99 183. \mark and \insert and \vadjust allowed in restricted hmode (Jun 3) also in math; this is a comparatively big change [at present, \mark in a display causes TeX to crash with "can't happen"!] modules 652 and 679: mark_node,ins_node,adjust_node now permitted modules 576 and 578: t becomes a global variable adjust_tail modules 802 and 1110: new calling sequence to get the adjustments modules 254, 986, 993, 995, 996: adjusted_hbox_group for the new kind of hbox modules 698--690: cur_head and cur_tail added to alignment stack modules 703, 712, 715: adjustments gathered and appended during \halign 184. \ht, \wd, and \dp (Jun 6) 185. When displaying noads, use ^ and _ instead of ( and [ (Jun 6) 186. A..F in hex constants could be otherchar as well as letter (Jun 6) 187. Remove from module 417 (Jun 7) (it was redundant code) 188. \mkern .5\thinmuskip and \mkern\thinmuskip should be legal (Jun 7) 189. 2.5\space\space\dimen0 should work (Jun 7) previously it worked after "plus" or "minus" only! 190. to allow also \font for current font (Jun 7) "if cur_cmd=def_font then f:=cur_font else" added to module 507 191. \gdef not to be global when \globaldefs<0 (Jun 7) "and (global_defs>=0)" added to module 1139 192. \advance\spaceskip by-\spaceskip should yield zero_glue (Jun 7) the procedure trap_zero_glue is culled from module 1147 193. \show should work with any token (Jun 7) 194. \tokens to become 256 registers (Jun 8) \toks and \toksdef added in the straightforward way (this affects mainly eqtb, scan_something_internal, prefixed_command) 195. allow \indent in math mode (Jun 8) also, \valign in math mode to give missing $ error modules 1001 and 1043 disappear; 1004 is generalized slightly. 196. remove redundant code (Jun 8) In module 1044, there's no need to check cur_group and call off_save. Similarly in module 1053. 197. new_write_whatsit shouldn't allow \openout-1, \closeout-1 (Jun 8) (simple change to module 1258) 198. \lastbox should give error in math mode (Jun 8) (simple change to module 990) 199. \leaders not followed by proper glue should be back_error (Jun 9) [I made the change; TRIP should test this error message!] 200. Module 702, correction to beginning of \noalign (Jun 9) if mode=-vmode then normal_paragraph; 201. After alphabetic constant, expand the optional space (Jun 10) 202. Set space_factor:=1000 after rule or constructing an accent (Jun 12) That's in modules 964 and 1036. 203. blunder in module 783 (caught by Jim Sterken, fixed Jun 14) disc_width:=0 needs to be set before testing if s=null (A real bug that existed since the beginning! It showed up on page 37 of the September 1982 TRIP manual; my hand-checking was incomplete...) 204. Change to optional spaces after (Jun 14) The optional space will now be analogous to that after . 205. Fix conflict between \output and \everydisplay (Jun 14) In change 49, I should have inserted every_display before calling build_page. 206. Overflow errors to be consistent with statistics reporting (Jun 17) (See change 129.) 207. \tracing switches to be all positive vs nonpositive (Jun 17) *** The changes above were installed into version 0.99 on June 19, 1983 *** Version 0.999 208. \catcode`\%=14 to be done by INITEX (Jun 20) 209. \par in vmode to clear parshape etc. (Jun 21) Module 1005, which contains vmode+par_end, now calls normal_paragraph. 210. Improvement to change 39 (Jun 21) Module 593, overfull_rule not appended if solely due to hbadness 211. Alignment bug allows glue_set to be less than -1! (Jun 21) Modules 723 and 724 need to be patched. 212. Correction to change 134 (found by Debby Clark, Jun 22) Module 68: n to be declared integer, not nonnegative_integer. 213. "by" to be optional (suggested by Lamport, Jun 22) Module 1158 disappears 214. Module 1235, slight change in format_ident message (Jun 24) 215. New measures needed to thwart trickery (Jun 25) Glue set values computed by \span could have been brought into TeX's registers via, e.g., \valign and \vsplit; so the "kern" idea of module 722 is insufficient and should be abandoned. Extra boxes and glue are added; this has additional virtue of perfect accuracy in alignment of vertical rules. The main change is to introduce a new module after 722, in which s and t are updated for spans, and to eliminate the "equivalent kern" code from 719 (the corresponding glue calculations are now done in the new module). 216. leaders to affect height/width of their boxes (Jun 25) Module 583 splits into two parts (one for hpack, one for vpack). 217. \unskip permitted a little more often (Jun 28) Module 1018 reports error only if last_page_glue then . 219. "scaled" feature added to \font input. 220. \mathaccent still not working right? (Jul 2) Change 181, I forgot to correct delta when box x changed. 221. Remove confusion possible on file of length 1 (found by Lamport) Correction suggested by DRF, July 2: introduce bypass_eoln 222. Allow things like ^^b. (July 4) This simplifies modules 332 and 335; also affects 48 and 49. And (surprise) 58. 223. \escapechar \defaulthyphenchar \defaultskewchar \endlinechar (July 4) to make TeX less dependent on the character set A lot of error messages are now broken up so that they use print_esc 224. erstat added for file opening/closing (by DRF, July 7) That's module 27. 225. \tracingpages output to show total glue too (July 11) Added a procedure called print_page_totals, used also by show_activities. Broke modules 214 and 896 into two modules each. 226. Guard against insertion into an hbox (July 11) A new procedure ensure_vbox is called in modules 917 and 925. 227. = allowed (July 11) 228. \errhelp parameter added (July 11) 229. get_preamble_token should look at global_defs (July 11) Module 699 is patched. *** The above changes installed in preliminary version 0.999 on July 12, 1983, but I decided later in the day to do a few more things: 230. \string, \noexpand, \meaning to allow \outer (Todd Allen, July 12) 231. \the to be an expandable control sequence (July 12) Several things in the language are cleaned up: a) \the\tenrm replaced by \fontname\tenrm [\fontname] b) when expanding edef, etc., result of \the still expanded only only level c) expansion after \def not inhibited, since \noexpand is now present d) \the\the disallowed. 232. \unhbox and \unhcopy allowed in math mode if the box is void (July 12) Module 1020 is extended to handle this case. 233. Value of default_rule was incorrectly rounded (July 16) Module 424: default_rule=26214 {.39999 pt} 234. \mathaccent still not right! (July 16) I need to make the final height the max of (height of accented letter w/o superscript, height of unaccented letter w superscript). 235. \newlinechar parameter (July 16) simple change to print subroutine 236. boxes and rules to be allowed in discretionaries (sugg by HP man, July 16) in fact this simply requires omitting of the prohibition (in module 1031) and a few more cases equivalent to kern_node in modules 754, 755, 784. 237. \tracingcommands to show all expandable tokens (July 16) 238. \char to be allowed in \hyphenation list (July 16) Module 848 changes in the obvious way. 239. \aftergroup (July 16) A new save_type. 240. Curtail running dimensions inside alignments (sugg by ARK, July 16) Module 720. 241. Strange pattern data could cause PASCAL error (found July 17) Put "if hc[1]=127 then hyf[0]:=0;" at beginning of module 878. 242. hc codes for hyphenation are one lower (July 17) e.g., hc[...]:=lc_code(...)-1. This makes code 127 impossible to match. 243. whatsits also allowed after hyphenatable words (July 17) Module 812. 244. \/ makes an explicit kern (July 17) "subtype(tail):=explicit" in module 1023. *** Version 0.999 installed July 17, 1983. But later in the day I decided to do a few more things: 245. Lowercase letters allowed in file names (July 18) In module 452, omit the conversion to uppercase. 246. "No output file" becomes "No pages of output." (July 18) Module 571. 247. QRS on error leads to confirmation message (sugg by ARK, July 18) Module 84. *** The real version 0.999 finally installed July 18. * Version 1.0 (Changes made after the Version 0.999 listing of TeX82) (Henceforth the "final" module numbers are used) 248. Module 1215, allow space in \read n to \cs (by FY, July 25, 1983) @x patch in get_r_token routine begin restart: get_token; @y begin restart: repeat get_token; until cur_tok<>space_token; @z 249. Module 498, we must stack the current if type (FY, July 27) @x patch in conditional routine begin @;@+save_cond_ptr:=cond_ptr;@/ @y @!this_if:small_number; {type of this conditional} begin @;@+save_cond_ptr:=cond_ptr;this_if:=cur_chr;@/ @z Also replace cur_if by this_if in modules 501, 503, 506. The following patches do only what is necessary to make things work: @x print_cmd_chr(if_test,cur_if); @y print_cmd_chr(if_test,this_if); @z @x if cur_if=if_int_code then scan_int@+else scan_normal_dimen; @y if this_if=if_int_code then scan_int@+else scan_normal_dimen; @z @x if cur_if=if_char_code then b:=(n=cur_chr)@+else b:=(m=cur_cmd); @y if this_if=if_char_code then b:=(n=cur_chr)@+else b:=(m=cur_cmd); @z 250. Module 507, \ifx need not put a control sequence in hash table (July 29) @x get_token; n:=cs_ptr; p:=cur_cmd; q:=cur_chr; get_token; if cur_cmd<>p then b:=false @y get_next; n:=cs_ptr; p:=cur_cmd; q:=cur_chr; get_next; if cur_cmd<>p then b:=false @z 251. Module 86, message is lost (noticed by HWT, July 31) @x print("..."); print_ln; return; @y print("..."); print_ln; update_terminal; return; @z 252. Don't put empty at end of \input file! (Aug 1) [This simplifies the rules and the program, and also gets around a bug that occurred at the end of files with \endlinechar<0.] @x Module 362: @ An empty line is inserted at the end of the file, if the last line wasn't already empty, because |input_ln| sets |last:=first| when it discovers an |eof|. @^empty line at end of file@> @= begin incr(line); first:=start; if not force_eof then begin if input_ln(cur_file,true) then {not end of file} firm_up_the_line {this sets |limit|} else if limit<>start then firm_up_the_line {if |pausing|, the user can add more lines} else force_eof:=true; @y @ @= begin incr(line); first:=start; if not force_eof then begin if input_ln(cur_file,true) then {not end of file} firm_up_the_line {this sets |limit|} else force_eof:=true; @z *** The changes above went into Version 0.9999, which was widely distributed 253. Ridiculous blunder made in change 146 (found by FY, August 16) @x Correction to module 497 else loop@+begin q:=cond_ptr; if link(q)=p then begin type(p):=l; return; end; if q=null then confusion("if"); @:this can't happen if}{\quad if@> q:=link(q); @y else begin q:=cond_ptr; loop@+ begin if q=null then confusion("if"); @:this can't happen if}{\quad if@> if link(q)=p then begin type(q):=l; return; end; q:=link(q); end; @z 254. Minor amendment to stat(s) printing (cf. change 129) (August 16) @x in module 1334 wlog_ln(' ',str_ptr-init_str_ptr:1,' strings out of ', max_strings-init_str_ptr:1);@/ @y wlog(' ',str_ptr-init_str_ptr:1,' string'); if str_ptr<>init_str_ptr+1 then wlog('s'); wlog_ln(' out of ', @z 255. Bug in \xleader computations (found by FY, August 18) @x in module 592 @!lq,@!lr:integer; {quantities used in calculations for leaders} @y @!lq,@!lr,@!lx:integer; {quantities used in calculations for leaders} @z @x in module 626 begin edge:=cur_h+rule_wd; @; while cur_h+leader_wd<=edge do @; @y begin edge:=cur_h+rule_wd; lx:=0; @; while cur_h+leader_wd<=edge do @; @z @x in module 627 leader_wd:=leader_wd+lx; @y @z @x in module 628 cur_h:=save_h+leader_wd; @y cur_h:=save_h+leader_wd+lx; @z @x in module 635 begin edge:=cur_v+rule_ht; @; while cur_v+leader_ht<=edge do @; @y begin edge:=cur_v+rule_ht; lx:=0; @; while cur_v+leader_ht<=edge do @; @z @x in module 636 leader_ht:=leader_ht+lx; @y @z @x in module 637 cur_v:=save_v-height(leader_box)+leader_ht; @y cur_v:=save_v-height(leader_box)+leader_ht+lx; @z Also insert the following in modules 619 and 629: @!lx:scaled; {extra space between leader boxes} 256. \/ should apply to ligatures! (August 20) @x in module 1113 var f:internal_font_number; {the font in the |char_node|} begin if is_char_node(tail)and(tail<>head) then begin f:=font(tail); tail_append(new_kern(char_italic(f)(char_info(f)(character(tail))))); @y label exit; var p:pointer; {|char_node| at the tail of the current list} @!f:internal_font_number; {the font in the |char_node|} begin if tail<>head then begin if is_char_node(tail) then p:=tail else if type(tail)=ligature_node then p:=lig_char(tail) else return; f:=font(p); tail_append(new_kern(char_italic(f)(char_info(f)(character(p))))); @z @x later in that same module end; @y exit: end; @z 257. Another debugging hack. (August 27) @x module 1339 15: begin font_in_short_display:=null_font; short_display(n); end; @y 15: begin font_in_short_display:=null_font; short_display(n); end; 16: panicking:=not panicking; @z 258. Redundant code eliminated (August 27) Module 531 needn't set and reset name_in_progress [but it's harmless]. 259. Bug: \input shouldn't occur during font size spec (Spivak; fixed August 27) @x module 1258 @ @= @y @ @= name_in_progress:=true; {this keeps |cur_name| from being changed} @z @x module 1258 else s:=-1000 @y else s:=-1000; name_in_progress:=false @z 260. \ifhbox and \ifvbox introduced. (August 27) @x module 487 @d ifx_code=10 { `\.{\\ifx}' } @d if_eof_code=11 { `\.{\\ifeof}' } @d if_true_code=12 { `\.{\\iftrue}' } @d if_false_code=13 { `\.{\\iffalse}' } @d if_case_code=14 { `\.{\\ifcase}' } @y @d if_hbox_code=10 { `\.{\\ifhbox}' } @d if_vbox_code=11 { `\.{\\ifvbox}' } @d ifx_code=12 { `\.{\\ifx}' } @d if_eof_code=13 { `\.{\\ifeof}' } @d if_true_code=14 { `\.{\\iftrue}' } @d if_false_code=15 { `\.{\\iffalse}' } @d if_case_code=16 { `\.{\\ifcase}' } @z @x primitive("ifx",if_test,ifx_code); @y primitive("ifhbox",if_test,if_hbox_code); @!@:if_hbox_}{\.{\\ifhbox} primitive@> primitive("ifvbox",if_test,if_vbox_code); @!@:if_vbox_}{\.{\\ifvbox} primitive@> primitive("ifx",if_test,ifx_code); @z @x module 488 ifx_code:print_esc("ifx"); @y if_hbox_code:print_esc("ifhbox"); if_vbox_code:print_esc("ifvbox"); ifx_code:print_esc("ifx"); @z @x module 501 if_void_code: @; @y if_void_code, if_hbox_code, if_vbox_code: @; @z @x module 505 @ @= begin scan_eight_bit_int; b:=(box(cur_val)=null); end @y @ @= begin scan_eight_bit_int; p:=box(cur_val); if this_if=if_void_code then b:=(p=null) else if p=null then b:=false else if this_if=if_hbox_code then b:=(type(p)=hlist_node) else b:=(type(p)=vlist_node); end 261. Serious data structure error (found by Todd Allen, August 29) @x module 478 (an error introduced in change 231) q:=the_toks; link(p):=link(temp_head); p:=q; @y q:=the_toks; if link(temp_head)<>null then begin link(p):=link(temp_head); p:=q; end; @z 262. Minor patch for efficiency (August 29) @x module 466 begin store_new_token(info(r)); r:=link(r); @y begin fast_store_new_token(info(r)); r:=link(r); @z 263. Minor patch to error message (August 29) @module 579 print(" has "); print_int(font_params[f]); print(" fontdimen parameters"); @.Font x has n fontdimen...@> @y print(" has only "); print_int(font_params[f]); print(" fontdimen parameters"); @.Font x has only...@> @z *** The changes above comprise version 0.99999, used only at SAIL (August 29) 264. funny blank spaces are showable (August 30) @x module 298 spacer: print("blank space"); @y spacer: chr_cmd("blank space "); @z 265. \newlinechar [change 235] should affect print_char too (August 31) @x module 58 procedure print_char(@!c:ascii_code); {prints a single character} begin case selector of term_and_log: begin wterm(xchr[c]); write(log_file,xchr[c]); incr(term_offset); incr(file_offset); if term_offset=max_print_line then begin wterm_cr; term_offset:=0; end; if file_offset=max_print_line then begin wlog_cr; file_offset:=0; end; end; log_only: begin write(log_file,xchr[c]); incr(file_offset); if file_offset=max_print_line then print_ln; end; term_only: begin wterm(xchr[c]); incr(term_offset); if term_offset=max_print_line then print_ln; end; no_print: do_nothing; pseudo: if tally then if selector @y @z @x module 265 primitive("the",the,0); @!@:the_}{\.{\\the} primitive@> primitive("toks",toks_register,0); @!@:toks_}{\.{\\toks} primitive@> primitive("unskip",unskip,0);@/ @!@:unskip_}{\.{\\unskip} primitive@> @y primitive("the",the,0);@/ @!@:the_}{\.{\\the} primitive@> primitive("toks",toks_register,0);@/ @!@:toks_}{\.{\\toks} primitive@> @z @x module 266 last_skip: print_esc("lastskip"); @y @z @x module 266 unskip: print_esc("unskip"); @y @z @x module 413 last_skip: @; @y last_item: @; @z @x module 416 [I also changed the comment] primitive("dp",set_box_dimen,depth_offset); @!@:dp_}{\.{\\dp} primitive@> @y primitive("dp",set_box_dimen,depth_offset); @!@:dp_}{\.{\\dp} primitive@> primitive("lastpenalty",last_item,int_val); @!@:last_penalty_}{\.{\\lastpenalty} primitive@> primitive("lastkern",last_item,dimen_val); @!@:last_kern_}{\.{\\lastkern} primitive@> primitive("lastskip",last_item,glue_val); @!@:last_skip_}{\.{\\lastskip} primitive@> @z @x module 417 else print_esc("dp"); @y else print_esc("dp"); last_item: if chr_code=int_val then print_esc("lastpenalty") else if chr_code=dimen_val then print_esc("lastkern") else print_esc("lastskip"); @z @x module 424 @ Here is where \.{\\lastskip} is implemented. The reference count will be updated later. @:last_skip_}{\.{\\lastskip} primitive@> @= begin cur_val:=zero_glue; cur_val_level:=glue_val; if not is_char_node(tail)and(mode<>0) then begin if type(tail)=glue_node then begin cur_val:=glue_ptr(tail); if subtype(tail)=mu_glue then cur_val_level:=mu_val; end; end else if (mode=vmode)and(tail=head)and(last_page_glue<>max_halfword) then cur_val:=last_page_glue; end @y @ Here is where \.{\\lastpenalty}, \.{\\lastkern}, and \.{\\lastskip} are implemented. The reference count for \.{\\lastskip} will be updated later. @= begin if cur_chr=glue_val then cur_val:=zero_glue@+else cur_val:=0; cur_val_level:=cur_chr; if not is_char_node(tail)and(mode<>0) then case cur_chr of int_val: if type(tail)=penalty_node then cur_val:=penalty(tail); dimen_val: if type(tail)=kern_node then cur_val:=width(tail); glue_val: if type(tail)=glue_node then begin cur_val:=glue_ptr(tail); if subtype(tail)=mu_glue then cur_val_level:=mu_val; end; end {there are no other cases} else if (mode=vmode)and(tail=head) then case cur_chr of int_val: cur_val:=last_penalty; dimen_val: cur_val:=last_kern; glue_val: if last_glue<>max_halfword then cur_val:=last_glue; end; {there are no other cases} end @z @x module 982 [also the comment changes] @!last_page_glue:pointer; {used to implement \.{\\lastskip}} @y @!last_glue:pointer; {used to implement \.{\\lastskip}} @!last_penalty:integer; {used to implement \.{\\lastpenalty}} @!last_kern:scaled; {used to implement \.{\\lastkern}} @z @x module 991 last_page_glue:=max_halfword; @y last_glue:=max_halfword; last_penalty:=0; last_kern:=0; @z @x module 994 @; @y @; @z @x module 996 @ @= if last_page_glue<>max_halfword then delete_glue_ref(last_page_glue); if type(p)=glue_node then begin last_page_glue:=glue_ptr(p); add_glue_ref(last_page_glue); end else last_page_glue:=max_halfword @y @ @= if last_glue<>max_halfword then delete_glue_ref(last_glue); last_penalty:=0; last_kern:=0; if type(p)=glue_node then begin last_glue:=glue_ptr(p); add_glue_ref(last_glue); end else begin last_glue:=max_halfword; if type(p)=penalty_node then last_penalty:=penalty(p) else if type(p)=kern_node then last_kern:=width(p); end @z @x module 1017 if last_page_glue<>max_halfword then delete_glue_ref(last_page_glue); @; {this sets |last_page_glue:=max_halfword|} @y if last_glue<>max_halfword then delete_glue_ref(last_glue); @; {this sets |last_glue:=max_halfword|} @z @x module 1048 vmode+vmove,hmode+hmove,mmode+hmove,any_mode(last_skip), @y vmode+vmove,hmode+hmove,mmode+hmove,any_mode(last_item), @z @x module 1104 any_mode(unskip): delete_skip; @y any_mode(remove_item): delete_last; @z @x module 1105 procedure delete_skip; var p:pointer; {runs through the current list} begin if (mode=vmode)and(tail=head) then @ else begin if not is_char_node(tail) then if type(tail)=glue_node then @y procedure delete_last; var p:pointer; {runs through the current list} begin if (mode=vmode)and(tail=head) then @ else begin if not is_char_node(tail) then if type(tail)=cur_chr then @z @x module 1106 @ @= begin if last_page_glue<>max_halfword then begin you_cant; help2("Sorry...I'm usually unable to take things from the current")@/ ("page. Try `I\vskip-\lastskip' instead."); error; @y @ @= begin if (cur_chr<>glue_node)or(last_glue<>max_halfword) then begin you_cant; help2("Sorry...I'm usually unable to take things from the current")@/ ("page. Try `I\vskip-\lastskip' instead."); if cur_chr=kern_node then help_line[0]:= ("page. Try `I\kern-\lastkern' instead.") else if cur_chr<>glue_node then help_line[0]:=@| ("page. Perhaps you can make the output routine do it."); error; @z @x module 1107 primitive("unhbox",un_hbox,box_code);@/ @y primitive("unpenalty",remove_item,penalty_node);@/ @!@:un_penalty_}{\.{\\unpenalty} primitive@> primitive("unkern",remove_item,kern_node);@/ @!@:un_kern_}{\.{\\unkern} primitive@> primitive("unskip",remove_item,glue_node);@/ @!@:un_skip_}{\.{\\unskip} primitive@> primitive("unhbox",un_hbox,box_code);@/ @z @x module 1108 un_hbox: if chr_code=copy_code then print_esc("unhcopy") @y remove_item: if chr_code=glue_node then print_esc("unskip") else if chr_code=kern_node then print_esc("unkern") else print_esc("unpenalty"); un_hbox: if chr_code=copy_code then print_esc("unhcopy") @z *** The above changes installed in version 0.999999 (September 5, 1983) 267. Undo change 29: it was overkill and not needed (Sep 17) @x module 1257 label exit, common_ending; var u:pointer; {user's font identifier} @!s:scaled; {stated ``at'' size, or negative of scaled magnification} @!f:internal_font_number; {runs through existing fonts} begin if job_name=0 then open_log_file; {avoid confusing \.{texput} with the font name} @; define(u,set_font,null_font); scan_optional_equals; scan_file_name; @; @; f:=read_font_info(u,cur_name,cur_area,s); common_ending: equiv(u):=f; geq_define(hash_used,set_font,f); font_ident[f]:=hash_used; exit:end; @y label common_ending; var u:pointer; {user's font identifier} @!s:scaled; {stated ``at'' size, or negative of scaled magnification} @!f:internal_font_number; {runs through existing fonts} begin if job_name=0 then open_log_file; {avoid confusing \.{texput} with the font name} get_r_token; u:=cs_ptr; define(u,set_font,null_font); scan_optional_equals; scan_file_name; @; @; f:=read_font_info(u,cur_name,cur_area,s); common_ending: equiv(u):=f; font_ident[f]:=u; end; @z @x module 1260 @ We reserve a special control sequence for the font identifier; this one cannot be redefined by the user, so it is safe to return it as a value of \.{\\the\\font}. @= get_r_token; if cs_ptr help2("You should say, e.g., `\font\ffn=fontfilename'.")@/ ("(I'm going to ignore the \font command you just gave.)"); back_error; return; end; repeat if hash_is_full then overflow("hash size",hash_size); @:TeX capacity exceeded hash size}{\quad hash size@> decr(hash_used); until text(hash_used)=0; {search for an empty location in |hash|} u:=cs_ptr; text(hash_used):=text(u); {copy the name} @!stat incr(cs_count);@+tats@;@/ @y @z Note: Since module 1260 has disappeared, module 1258 has been split into two. 268. Minor change to diagnostic output format (September 18) @x module 211 [print_mode] 2:print("displayed math"); @y 2:print("display math"); @z 269. Kerns inserted for accents must be explicit (September 20) @x module 1123 @!p,@!q: pointer; {character and box nodes} @y @!p,@!q,@!r:pointer; {character, box, and kern nodes} @z @x module 1125 link(tail):=new_kern(delta); link(link(tail)):=p; link(p):=new_kern(-a-delta); tail:=link(p); p:=q; @y r:=new_kern(delta); subtype(r):=explicit; link(tail):=r; link(r):=p; tail:=new_kern(-a-delta); subtype(tail):=explicit; link(p):=tail; p:=q; @z 270. "log" changed to "transcript" in a few output messages (Sep 26) @x module 535 prompt_file_name("log file name",".log"); @y prompt_file_name("transcript file name",".log"); @z @x module 1293 ("lists on your terminal as well as on the log file."); @y ("lists on your terminal as well as in the transcript file."); @z @x module 1335 print_nl("(see the log file for additional information)"); @.see the log file...@> @y print_nl("(see the transcript file for additional information)"); @.see the transcript file...@> @z 271. Uninitialized variable bug (found by Bernd Schulze, 1 Oct 83) @x module 944 begin if trie_op_ptr>=max_quarterword-1 then {overflow} begin trie_op_ptr:=max_quarterword; new_trie_op:=min_quarterword; return; @y we allow one more trie op (OK since trie_op_hash_size is big enough) begin if trie_op_ptr=max_quarterword then {overflow} begin new_trie_op:=min_quarterword; return; @z 272. Spaces at end of lines ignored also in TEX.POOL (by DRF, 14 Oct 83) @x module 52 begin if eoln(pool_file) then bad_pool('! TEX.POOL line too short.'); @.TEX.POOL line too short@> read(pool_file,m); append_char(xord[m]); @y begin if eoln(pool_file) then m:=' '@+else read(pool_file,m); append_char(xord[m]); @z 273. |history| updates (by DRF, 14 Oct 83) @x module 77 deletions_allowed:=true; history:=spotless; error_count:=0; @y deletions_allowed:=true; error_count:=0; {|history| is initialized elsewhere} @z @x module 1332 @p begin {@!|start_here|} @y @p begin {@!|start_here|} history:=fatal_error_stop; {in case we quit during initialization} @z @x ibid. main_control; {come to life} @y history:=spotless; {ready to go!} main_control; {come to life} @z 274. improved "runaway" messages (suggested by FY, October 18) @x module 305 (the introductory comment is changed too) @d aligning=4 {|scanner_status| when reading an alignment preamble} @= @!scanner_status : normal..aligning; {can a subfile end now?} @y @d aligning=4 {|scanner_status| when reading an alignment preamble} @d absorbing=5 {|scanner_status| when reading a balanced text} @= @!scanner_status : normal..absorbing; {can a subfile end now?} @z @x module 306 (string space is also now conserved slightly) defining: begin print("definition?"); p:=def_ref; end; matching: begin print("argument?"); p:=temp_head; end; aligning: begin print("preamble?"); p:=hold_head; end; end; {there are no other cases} print_ln; show_token_list(link(p),null,error_line-10); @y defining: begin print("definition"); p:=def_ref; end; matching: begin print("argument"); p:=temp_head; end; aligning: begin print("preamble"); p:=hold_head; end; absorbing: begin print("text"); p:=def_ref; end; end; {there are no other cases} print_char("?");print_ln; show_token_list(link(p),null,error_line-10); @x module 339 (I also changed the module name) end; {there are no other cases} @y absorbing:begin print("text"); info(p):=right_brace_token+"}"; end; end; {there are no other cases} @z @x module 473 begin scanner_status:=defining; warning_index:=cs_ptr; def_ref:=get_avail; info(def_ref):=null; @y begin if macro_def then scanner_status:=defining @+else scanner_status:=absorbing; warning_index:=cs_ptr; def_ref:=get_avail; info(def_ref):=null; @z 275. similar, but this corrects a real bug (found by FY, October 18) @x module 1226 cs_ptr:=q; @; if cur_cmd<>left_brace then @; back_input; q:=scan_toks(false,false); @y @; if cur_cmd<>left_brace then @; back_input; cs_ptr:=q; q:=scan_toks(false,false); @z 276. Change #119 should have changed module 1090 too (by Barry Smith, Oct 24) @x module 1183 [which was module 1090 at the time of change 119] begin if c mod delimited_code=above_code then scan_normal_dimen; if c>=delimited_code then begin scan_delimiter(garbage,false); scan_delimiter(garbage,false); end; @y begin if c>=delimited_code then begin scan_delimiter(garbage,false); scan_delimiter(garbage,false); end; if c mod delimited_code=above_code then scan_normal_dimen; @z 277. Changes for efficiency, based on empirical frequency data (Nov 9) @x module 45 [since the result is true almost always] begin j:=str_start[s]; result:=false; while jbuffer[k] then goto not_found; @y begin j:=str_start[s]; while jbuffer[k] then begin result:=false; goto not_found; end; @z @x module 380 [many compilers don't handle "while true do" very well] label done; begin loop begin get_next; @^inner loop@> if cur_cmd<=max_command then goto done; if cur_cmd>=call then if cur_cmd if cur_cmd<=max_command then goto done; if cur_cmd>=call then if cur_cmd0 then @z @x module 852 [avoid calling |badness| in most common case] else begin b:=badness(line_width-cur_active_width[1],cur_active_width[2]); @y else begin if shortfall>7230584 then if cur_active_width[2]<1663497 then begin b:=inf_bad; fit_class:=very_loose_fit; goto done1; end; b:=badness(shortfall,cur_active_width[2]); @z @x module 852, continued else fit_class:=decent_fit; @y else fit_class:=decent_fit; done1: @z @x module 853 [using |shortfall|, since we now have it] begin if cur_active_width[1]-line_width>cur_active_width[6] then b:=inf_bad+1 else b:=badness(cur_active_width[1]-line_width,cur_active_width[6]); @y begin if -shortfall>cur_active_width[6] then b:=inf_bad+1 else b:=badness(-shortfall,cur_active_width[6]); @z 278. Forgotten |error| call (noticed by Gabi Kuper, December 3, 1983) @x module 500 help1("I'm ignoring this; it doesn't match any \if."); @y help1("I'm ignoring this; it doesn't match any \if."); error; @z *** Version 1.0 released on December 3, 1983 incorporates all of the above. Version 1.1 279. Problem with change 267 (found by Mike Urban, received 2 Feb 84) (I had overlooked many problems, e.g. `{\font\a=x \global\a}\the\font' and `\font\a=x \font\b=x \let\b=\undefined \the\a', etc. The remedy involves removal of the font_ident array, so there's a sprinkling of corrections in lots of modules. But basically the change is quite conservative, so it shouldn't spawn any new bugs (it says here).) @x module 174 (removing a reference to |font_ident|) else sprint_cs(font_ident[font(p)]); @y else @; @z @x module 176 (removing a reference to |font_ident|) else sprint_cs(font_ident[font(p)]); @y else @; @z @x module 222 (redefining and expanding the `frozen' area) @d frozen_null_font=frozen_control_sequence+9 {permanent `\.{\\nullfont}'} @d frozen_dont_expand=frozen_control_sequence+10 {permanent `\.{\\notexpanded:}'} @d undefined_control_sequence=frozen_control_sequence+11 {dummy location} @y @d frozen_dont_expand=frozen_control_sequence+9 {permanent `\.{\\notexpanded:}'} @d frozen_null_font=frozen_control_sequence+10 {permanent `\.{\\nullfont}'} @d font_id_base=frozen_null_font-font_base {begins table of 257 permanent font identifiers} @d undefined_control_sequence=frozen_null_font+257 {dummy location} @z @x module 234 (removing a reference to |font_ident|, awkwardly) print_char("="); sprint_cs(font_ident[equiv(n)]); @y print_char("=");@/ print_esc(hash[font_id_base+equiv(n)].rh); {that's |text(font_id_base+equiv(n))|} @z @x module 256 (adding a new macro, font_id_text) @d hash_is_full == (hash_used=hash_base) {test if all positions are occupied} @y @d hash_is_full == (hash_used=hash_base) {test if all positions are occupied} @d font_id_text(#) == text(font_id_base+#) {a frozen font identifier's name} @z @x module 262 (relaxing a former restriction) else if (text(p)<128)or(text(p)>=str_ptr) then print_esc("NONEXISTENT.") @y else if (text(p)<0)or(text(p)>=str_ptr) then print_esc("NONEXISTENT.") @z @x module 267 (pick up the changes from 174 and 176) @!@^Single-character primitives@> @y @!@^Single-character primitives@> Meanwhile, this is a convenient place to catch up on something we were unable to do before the hash table was defined: @= print_esc(font_id_text(font(p))) @z @x module 415 (removing another reference to font_ident) scanned_result(font_ident[cur_val])(ident_val); @y scanned_result(font_id_base+cur_val)(ident_val); @z @x module 548 (change to the comment only) to the user's font~\.{\\f}. For example, if this internal number is 13, we will have |font_ident[13]=p| and |equiv(p)=13|, where |p| is the |eqtb| location of the control sequence~\.{\\f}. @y to the user's font~\.{\\f}. Adding this number to |font_id_base| gives the |eqtb| location of a ``frozen'' control sequence that will always select the font. @z @x module 549 (deleting the declaration of font_ident) @!font_ident:array[internal_font_number] of pointer; {the most recent user font identifier corresponding to an internal font number} @y @z @x module 552 (deleting an unnecessary initialization of font_ident) font_ident[null_font]:=frozen_null_font; @y @z @x module 579 (removing another reference to font_ident) begin print_err("Font "); sprint_cs(font_ident[f]); @y begin print_err("Font "); print_esc(font_id_text(f)); @z @x module 1257 (this is the real change!) begin if job_name=0 then open_log_file; {avoid confusing \.{texput} with the font name} get_r_token; u:=cs_ptr; define(u,set_font,null_font); scan_optional_equals; scan_file_name; @; @; f:=read_font_info(u,cur_name,cur_area,s); common_ending: equiv(u):=f; font_ident[f]:=u; @y @!t:str_number; {name for the frozen font identifier} @!old_setting:0..max_selector; {holds |selector| setting} begin if job_name=0 then open_log_file; {avoid confusing \.{texput} with the font name} get_r_token; u:=cs_ptr; if u>=hash_base then t:=text(u) else if u>=single_base then if u=null_cs then t:="FONT"@+else t:=u-single_base else begin old_setting:=selector; selector:=new_string; print("FONT"); print(u-active_base); selector:=old_setting; @.FONTx@> str_room(1); t:=make_string; end; define(u,set_font,null_font); scan_optional_equals; scan_file_name; @; @; f:=read_font_info(u,cur_name,cur_area,s); common_ending: equiv(u):=f; eqtb[font_id_base+f]:=eqtb[u]; font_id_text(f):=t; @z @x module 1260 (change to the comment only) the new value becomes the |font_ident| of record. Font names `\.{xyz}' and @y the new name becomes the font identifier of record. Font names `\.{xyz}' and @z @x module 1322 (no need to dump font_ident) begin dump_int(font_ident[k]); dump_qqqq(font_check[k]); @y begin dump_qqqq(font_check[k]); @z @x module 1322 (or to print from it) print_nl("\font"); sprint_cs(font_ident[k]); print_char("="); @y print_nl("\font"); print_esc(font_id_text(k)); print_char("="); @z @x module 1323 (or to undump it) begin undump(active_base)(undefined_control_sequence)(font_ident[k]); undump_qqqq(font_check[k]);@/ @y begin undump_qqqq(font_check[k]);@/ @z 280. Double interrupt possibility (found by Clint Cuzzo, received 9 Feb 84) @x module 1031 if interrupt>0 then if OK_to_interrupt then begin back_input; pause_for_instructions; goto big_switch; @y if interrupt<>0 then if OK_to_interrupt then begin back_input; check_interrupt; goto big_switch; @z 281. Improve spacing in $(A,<)$. (12 Feb 84) @x module 764 "0234000122*4000133**3**344*0400400*000000234000111*4111112341011" @y "0234000122*4000133**3**344*0400400*000000234000111*1111112341011" @z 282. Bad goto! (diagnosis by Clint Cuzzo and George O'Connor, recd 13 Feb 84) @x module 344 (here we simply change the name of module 346) any_state_plus(invalid_char): @; @y any_state_plus(invalid_char): @; @z @x module 346 (because clear_for_error_prompt might make state=token_list) goto switch; @y goto restart; @z 283. String pool economy (suggested by DRF, 13 Feb 84) @x module 537 @; @y if name=str_ptr-1 then {we can conserve string pool space now} begin flush_string; name:=cur_name; end; @; @z 284. Nicer scaled output (suggested by METAFONT development, 26 Feb 84) @x module 103 be reproduced exactly. [{\sl Proof:\/} If round$(x)=\lfloor x+{1\over2}\rfloor$ and if $\alpha<1$, it is not difficult to verify that round$(\alpha\,\hbox{round}( \alpha^{-1}n))=n$ for all integers |n|. In our case $\alpha=2^{16}/10^5$.] @p procedure print_scaled(@!s:scaled); {prints scaled real, rounded to five digits} begin if s<0 then begin print_char("-"); negate(s); {print the sign, if negative} end; print_int(s div unity); {print the integer part} s:=((s mod unity) * 3125 + 1024) div 2048; {now |0<=s<100000| is the fraction part} print_char("."); repeat print_char("0"+(s div 10000)); s:=10*(s mod 10000); until s=0; end; @y be reproduced exactly; the ``simplest'' such decimal number is output, but there is always at least one digit following the decimal point. The invariant relation in the \&{repeat} loop is that a sequence of decimal digits yet to be printed will yield the original number if and only if they form a fraction~$f$ in the range $s-\delta\L10\cdot2^{16}funity then s:=s+@'100000-(delta div 2); {round the last digit} print_char("0"+(s div unity)); s:=10*(s mod unity); delta:=delta*10; until s<=delta; end; @z *** Those six changes account for version 1.1 (February 29, 1984). *** And we put the following change in too, at the last minute: 285. ".00000762939453126pt" didn't round correctly! (March 2, 1984) @x module 452 if k<16 then {digits for |k>=16| cannot affect the result} @y (Note, I also changed the comment in module 102: 16 -> 17) if k<17 then {digits for |k>=17| cannot affect the result} @z *** Note: I changed "cs_ptr" to "cur_cs", since the name change is more indicative of the fact that this variable makes a trio with cur_cmd and cur_chr. The TEX.WEB source changed 78 times, as a result, but none of the author's change files were affected. (But note: "save_cs_ptr" was not changed to "save_cur_cs", because of a name conflict.) *** And the following two were slipped in at the last second: 286. loophole permitted get_next recursion (March 16, 1984) @x module 336 begin @; @y begin deletions_allowed:=false; @; @z @x ibid end; @y deletions_allowed:=true; end; @z [the changes to deletions_allowed in module 338 can now be removed] 287. terminal not open when the program starts bad (March 24, 1984) @x module 1332 initialize; {set global variables to their starting values} @@; if bad>0 then begin wake_up_terminal; wterm('Ouch---my internal constants have been', ' clobbered!---case ',bad:1); @.Ouch...clobbered@> goto final_end; end; @y @@; if bad>0 then begin t_open_out; wterm('Ouch---my internal constants have been', ' clobbered!---case ',bad:1); @.Ouch...clobbered@> goto final_end; end; initialize; {set global variables to their starting values} @z *** Note: "Cosmetic" changes were also made in module 363 ("print_ln" moved to after "wake_up_terminal") and in some commentary. *** Another last-minute correction: 288. \patterns{xxx...xxxdxxxdxxx} anomaly found by JRD (Mar 27, 1984) @x module 962 else begin hyf[k]:=cur_chr-"0"; digit_sensed:=true; @y else begin hyf[k]:=cur_chr-"0"; if k<63 then digit_sensed:=true; @z *** Yoicks, yet ANOTHER: 289. a whole case of copy_node_list forgotten (Apr 11, 1984) @x module 206 othercases confusion("copying") @y adjust_node: begin r:=get_node(small_node_size); adjust_ptr(r):=copy_node_list(adjust_ptr(p)); end; {|words=1=small_node_size-1|} othercases confusion("copying") @z *** And "finally"... 290. uninitialized variables could be accessed (found by Nick Briggs, June 11) @x module 552 font_size[null_font]:=0; font_dsize[null_font]:=0; @y font_size[null_font]:=0; font_dsize[null_font]:=0; char_base[null_font]:=0; width_base[null_font]:=0; height_base[null_font]:=0; depth_base[null_font]:=0; italic_base[null_font]:=0; lig_kern_base[null_font]:=0; kern_base[null_font]:=0; exten_base[null_font]:=0; @z (actual values are immaterial except for debugging safeguards) 291. same, cf. modules 355 and 389 (Nick Briggs, June 11) @x module 331 scanner_status:=normal; first:=1; @y for first:=0 to buf_size do buffer[first]:=0; scanner_status:=normal; warning_index:=null; first:=1; @z (error was harmless except that it might trigger debugging checks) 292. missing ligature/kern (found by JRD, June 21) @x module 1036 if (cur_cmd=letter)or(cur_cmd=other_char) then r:=qi(cur_chr) @y if (cur_cmd=letter)or(cur_cmd=other_char)or(cur_cmd=char_given) then r:=qi(cur_chr) @z 293. quarterword constraint is made explicit (July 4) @x module 111 if (buf_size>max_halfword) then bad:=18; @y if buf_size>max_halfword then bad:=18; if max_quarterword-min_quarterword<255 then bad:=19; @z 294. trivial optimization made for consistency with MF (July 7) @x module 363 if (pausing>0)and(interaction>nonstop_mode) then @y if pausing>0 then if interaction>nonstop_mode then @z 295. \tracingmacros>1 for more diagnostics (July 8) @x module 323 if t=macro then param_start:=param_ptr@+else loc:=link(p); @y if t=macro then param_start:=param_ptr else begin loc:=link(p); if tracing_macros>1 then begin begin_diagnostic; print_nl(""); case t of mark_text:print_esc("mark"); write_text:print_esc("write"); othercases print_cmd_chr(assign_toks,t-output_text+output_routine_loc) endcases;@/ print("->"); token_show(p); end_diagnostic(false); end; end; @z *** The changes above were incorporated in Version 1.1, released July 9, 1984. Version 1.2 296. "see the transcript file" on offline show commands. (July 27, 1984) @x module 1293 @ @d show_error==@;@/ if interaction0 then begin@t@>@;@/ help3("This isn't an error message; I'm just \showing something.") @t\4\4@>@/ ("Type `I\show...' to show more (e.g., \show\cs,")@/ ("\showthe\count10, \showbox255, \showlists)."); end else begin@t@>@;@/ help5("This isn't an error message; I'm just \showing something.") @t\4\4@>@/ ("Type `I\show...' to show more (e.g., \show\cs,")@/ ("\showthe\count10, \showbox255, \showlists).")@/ ("And type `I\tracingonline=1\show...' to show boxes and")@/ ("lists on your terminal as well as in the transcript file."); end; error @= procedure show_whatever; var p:pointer; {tail of a token list to show} begin case cur_chr of show_code: @; show_box_code: @; show_the_code: @; othercases @ endcases; end; @y @ @= procedure show_whatever; label common_ending; var p:pointer; {tail of a token list to show} begin case cur_chr of show_lists: begin begin_diagnostic; show_activities; end; show_box_code: @; show_code: @; othercases @ endcases;@/ @; common_ending: if interaction0 then begin@t@>@;@/ help3("This isn't an error message; I'm just \showing something.")@/ ("Type `I\show...' to show more (e.g., \show\cs,")@/ ("\showthe\count10, \showbox255, \showlists)."); end else begin@t@>@;@/ help5("This isn't an error message; I'm just \showing something.") ("Type `I\show...' to show more (e.g., \show\cs,")@/ ("\showthe\count10, \showbox255, \showlists).")@/ ("And type `I\tracingonline=1\show...' to show boxes and")@/ ("lists on your terminal as well as in the transcript file."); end; error; end; @z @x module 1294 @ @= begin get_token; print_nl("> "); if cur_cs<>0 then begin sprint_cs(cur_cs); print_char("="); end; print_meaning; show_error; @y @ @= begin get_token; print_nl("> "); if cur_cs<>0 then begin sprint_cs(cur_cs); print_char("="); end; print_meaning; goto common_ending; @z @x module 1296 end_diagnostic(true); print_err("OK"); @.OK@> show_error; @y @z @x module 1297 flush_list(link(temp_head)); show_error; @y flush_list(link(temp_head)); goto common_ending; @z @x module 1298 @ @= begin begin_diagnostic; show_activities; end_diagnostic(true); print_err("OK"); show_error; @.OK@> end @y @ @= end_diagnostic(true); print_err("OK"); @.OK@> if selector=term_and_log then if tracing_online<=0 then begin selector:=term_only; print(" (see the transcript file)"); selector:=term_and_log; end @z 297. allow `0' in response to error prompts (October 20, 1984) @x module 84 "1","2","3","4","5","6","7","8","9": if deletions_allowed then @y "0","1","2","3","4","5","6","7","8","9": if deletions_allowed then @z Versions 1.3 and 1.4 298. Dirty PASCAL (two quarterword 0's were read as a halfword) (25 Nov 84) @x module 846 print(" -> @@@@"); print_int(serial(prev_break(passive))); @y print(" -> @@@@"); if prev_break(passive)=null then print_char("0") else print_int(serial(prev_break(passive))); @z 299. Ditto! (25 Nov 84) @x module 934 label reswitch, exit, found, not_found; @y label reswitch, exit, found, not_found, done; @z @x module 939 while info(p)>n-3 do {eliminate hyphens \TeX\ doesn't like} begin q:=link(p); free_avail(p); p:=q; end; @; @y loop@+ begin if p=null then goto done; if info(p); @z 300. Major change to memory management (25 Nov 84) [The following changes have two main merits: (1) TeX should run faster on virtual-memory systems when the jobs are small; (2) it should be possible to use the same production version of TeX both for jobs with lots of macros and few boxes as well as for jobs with lots of boxes and few macros, because the boundary line between the two types of storage is now chosen dynamically.] [The user is unaffected, except that there's only one "memory size" overflow error now instead of two.] [The TRIP test is now changed slightly: The correct settings of memory size parameters are now mem_min=mem_bot=1, mem_top=mem_max=3000.] @x module 11 @!mem_max=30000; {greatest index in \TeX's internal |mem| array; must be strictly less than |max_halfword|} @y @!mem_max=30000; {greatest index in \TeX's internal |mem| array; must be strictly less than |max_halfword|; must be equal to |mem_top| in \.{INITEX}, otherwise |>=mem_top|} @!mem_min=0; {smallest index in \TeX's internal |mem| array; must be |min_halfword| or more; must be equal to |mem_bot| in \.{INITEX}, otherwise |<=mem_bot|} @z @x module 12 @d mem_base=0 {smallest index in the |mem| array; must not be less than |min_halfword|} @d hi_mem_base=13000 {smallest index in the single-word area of |mem|; must be substantially larger than |mem_base| and smaller than |mem_max|} @y @d mem_bot=0 {smallest index in the |mem| array dumped by \.{INITEX}; must not be less than |mem_min|} @d mem_top==30000 {largest index in the |mem| array dumped by \.{INITEX}; must be substantially larger than |mem_bot| and not greater than |mem_max|} @z @x module 12 about |(mem_max-hi_mem_base)/6|, but 2100 is already quite generous} @y about |(mem_max-mem_min)/10|, but 2100 is already quite generous} @z @x module 14 if (hi_mem_basemem_max) then bad:=4; @y if mem_bot+1100>mem_top then bad:=4; @z @x module 111 if (min_quarterword>0)or(max_quarterword<127) then bad:=11; @y init if (mem_min<>mem_bot)or(mem_max<>mem_top) then bad:=10;@+tini@;@/ if (mem_min>mem_bot)or(mem_max0)or(max_quarterword<127) then bad:=11; @z @x module 111 if (mem_base=max_halfword) then bad:=14; @y if (mem_min=max_halfword) then bad:=14; @z @x module 115 value represents a null pointer. @d pointer==halfword {a flag or a location in |mem| or |eqtb|} @d null==mem_base {the null pointer} @y value represents a null pointer. \TeX\ does not assume that |mem[null]| exists. @d pointer==halfword {a flag or a location in |mem| or |eqtb|} @d null==min_halfword {the null pointer} @z @x module 116 @ The |mem| array is divided once and for all into two regions that are allocated separately. Locations less than |hi_mem_base| are used for storing @y @ The |mem| array is divided into two regions that are allocated separately, but the dividing line between these two regions is not fixed; they grow together until finding their ``natural'' size in a particular job. Locations less than or equal to |lo_mem_max| are used for storing @z @x module 116 relevant size when a node is freed. The remaining region of |mem| is allocated in single words using a conventional \.{AVAIL} stack. Incidentally, it would be feasible to construct implementations of \TeX\ that are based on 16-bit words instead of 32-bit words, for machines having comparatively small memories. In such cases it might be desirable to have two parallel arrays for the upper part of memory, called say \\{mem\_link}|[p]| and \\{mem\_info}|[p]|, since the single-word region in the present implementation consists entirely of |memory_word| items of type |two_halves|. @^small computers@> @y relevant size when a node is freed. Locations greater than or equal to |hi_mem_min| are used for storing one-word records; a conventional \.{AVAIL} stack is used for allocation in this region. Locations of |mem| between |mem_bot| and |mem_top| may be dumped as part of preloaded format files, by the \.{INITEX} preprocessor. @.INITEX@> Production versions of \TeX\ may extend the memory at both ends in order to provide more space; locations between |mem_min| and |mem_bot| are always used for variable-size nodes, and locations between |mem_top| and |mem_max| are always used for single-word nodes. The key pointers that govern |mem| allocation have a prescribed order: $$\hbox{|null<=mem_min<=mem_bot end; @y else begin decr(hi_mem_min); p:=hi_mem_min; if hi_mem_min<=lo_mem_max then begin runaway; {if memory is exhausted, display possible runaway text} overflow("main memory size",mem_max+1-mem_min); {quit; all one-word nodes are busy} @:TeX capacity exceeded main memory size}{\quad main memory size@> end; end; @z @x module 125 label found,exit; @y label found,exit,restart; @z @x module 125 begin p:=rover; {start at some free node in the ring} @y begin restart: p:=rover; {start at some free node in the ring} @z @x module 125 overflow("box memory size",hi_mem_base-mem_base); {sorry, nothing satisfactory is left} @:TeX capacity exceeded box memory size}{\quad box memory size@> found: link(r):=null; {this node is now nonempty} @!stat var_used:=var_used+s; {maintain usage statistics} if var_used>max_var_used then max_var_used:=var_used; @y if lo_mem_max+2; overflow("main memory size",mem_max+1-mem_min); {sorry, nothing satisfactory is left} @:TeX capacity exceeded main memory size}{\quad main memory size@> found: link(r):=null; {this node is now nonempty} @!stat var_used:=var_used+s; {maintain usage statistics} @z @x modules 126--127 @ Empirical tests show that the routine in this section performs a |remove_node| operation about 0.75 times per allocation, on the average, after which it finds that |r>p+1| about 95\% of the time. @= q:=p+node_size(p); {find the physical successor} @^inner loop@> while is_empty(q) do @; r:=q-s; if r>p+1 then @; if r=p then if ((rlink(p)<>rover) or (llink(p)<>rover)) then @; node_size(p):=q-p {reset the size in case it grew} @ @= begin t:=rlink(q); @^inner loop@> if q=rover then rover:=t; llink(t):=llink(q); rlink(llink(q)):=t;@/ q:=q+node_size(q); end @y @ The lower part of |mem| grows by 1000 words at a time, unless we are very close to going under. When it grows, we simply link a new node into the available-space list. This method of controlled growth helps to keep the |mem| usage consecutive when \TeX\ is implemented on ``virtual memory'' systems. @^virtual memory@> @= begin if lo_mem_max+1000p+1| about 95\% of the time. @= q:=p+node_size(p); {find the physical successor} @^inner loop@> while is_empty(q) do {merge node |p| with node |q|} begin t:=rlink(q); if q=rover then rover:=t; llink(t):=llink(q); rlink(llink(q)):=t;@/ q:=q+node_size(q); end; r:=q-s; if r>p+1 then @; if r=p then if ((rlink(p)<>rover) or (llink(p)<>rover)) then @; node_size(p):=q-p {reset the size in case it grew} @z % module 129 no longer refers to remove_node; I don't recall when it changed! @x module 134 @d is_char_node(#) == (#>hi_mem_base) @y @d is_char_node(#) == (#>=hi_mem_min) @z @x module 162 example, locations |mem_base| to |mem_base+3| are always used to store the specification for glue that is `\.{0pt plus 0pt minus 0pt}'. The following macro definitions accomplish the static allocation by giving symbolic names to the fixed positions. Dynamic allocation of variable-size nodes is restricted to locations |first_mem| through |(hi_mem_base-1)|, and single-word nodes are dynamically allocated in locations |second_mem| through |mem_max|, inclusive. It is harmless to let |lig_trick|, |garbage|, and |backup_head| share the same location of |mem|. @d zero_glue==mem_base {specification for \.{0pt plus 0pt minus 0pt}} @y example, locations |mem_bot| to |mem_bot+3| are always used to store the specification for glue that is `\.{0pt plus 0pt minus 0pt}'. The following macro definitions accomplish the static allocation by giving symbolic names to the fixed positions. Static variable-size nodes appear in locations |mem_bot| through |lo_mem_stat_max|, and static single-word nodes appear in locations |hi_mem_stat_min| through |mem_top|, inclusive. It is harmless to let |lig_trick|, |garbage|, and |backup_head| share the same location of |mem|. @d zero_glue==mem_bot {specification for \.{0pt plus 0pt minus 0pt}} @z @x module 162 @d first_mem==fil_neg_glue+glue_spec_size {first dynamically allocatable word in the variable-size |mem|} @# @d page_ins_head==hi_mem_base {list of insertion data for current page} @d contrib_head==hi_mem_base+1 {vlist of items not yet on current page} @d page_head==hi_mem_base+2 {vlist for current page} @d temp_head==hi_mem_base+3 {head of a temporary list of some kind} @d hold_head==hi_mem_base+4 {head of a temporary list of another kind} @d adjust_head==hi_mem_base+5 {head of adjustment list returned by |hpack|} @d active==hi_mem_base+6 {head of active list in |line_break|, needs two words} @d align_head==hi_mem_base+8 {head of preamble list for alignments} @d end_span==hi_mem_base+9 {tail of spanned-width lists} @d omit_template==hi_mem_base+10 {a constant token list} @d null_list==hi_mem_base+11 {permanently empty list} @d lig_trick==hi_mem_base+12 {a ligature masquerading as a |char_node|} @d garbage==hi_mem_base+12 {used for scrap information} @d backup_head==hi_mem_base+13 {head of token list built by |scan_keyword|} @d second_mem==hi_mem_base+14 {first dynamically allocatable word in the one-word |mem|} @y @d lo_mem_stat_max==fil_neg_glue+glue_spec_size-1 {largest statically allocated word in the variable-size |mem|} @# @d page_ins_head==mem_top {list of insertion data for current page} @d contrib_head==mem_top-1 {vlist of items not yet on current page} @d page_head==mem_top-2 {vlist for current page} @d temp_head==mem_top-3 {head of a temporary list of some kind} @d hold_head==mem_top-4 {head of a temporary list of another kind} @d adjust_head==mem_top-5 {head of adjustment list returned by |hpack|} @d active==mem_top-6 {head of active list in |line_break|, needs two words} @d align_head==mem_top-8 {head of preamble list for alignments} @d end_span==mem_top-9 {tail of spanned-width lists} @d omit_template==mem_top-10 {a constant token list} @d null_list==mem_top-11 {permanently empty list} @d lig_trick==mem_top-12 {a ligature masquerading as a |char_node|} @d garbage==mem_top-12 {used for scrap information} @d backup_head==mem_top-13 {head of token list built by |scan_keyword|} @d hi_mem_stat_min==mem_top-13 {smallest statically allocated word in the one-word |mem|} @z @x module 164 for k:=mem_base+1 to first_mem-1 do mem[k].sc:=0; {all glue dimensions are zeroed} @^data structure assumptions@> k:=mem_base;@+while k k:=mem_bot;@+while k<=lo_mem_stat_max do {set first words of glue specifications} @z @x module 164 rover:=first_mem; link(rover):=empty_flag; {now initialize the dynamic memory} node_size(rover):=hi_mem_base-rover; {which is one big available node} llink(rover):=rover; rlink(rover):=rover;@/ link(hi_mem_base):=null; info(hi_mem_base):=null; for k:=hi_mem_base+1 to second_mem-1 do mem[k]:=mem[hi_mem_base];{clear list heads} @; avail:=null; mem_end:=second_mem-1; {initialize the one-word memory} var_used:=first_mem-mem_base; dyn_used:=second_mem-hi_mem_base; max_var_used:=var_used; {initialize statistics} @y rover:=lo_mem_stat_max+1; link(rover):=empty_flag; {now initialize the dynamic memory} node_size(rover):=1000; {which is a 1000-word available node} llink(rover):=rover; rlink(rover):=rover;@/ lo_mem_max:=rover+1000; link(lo_mem_max):=null; info(lo_mem_max):=null;@/ for k:=hi_mem_stat_min to mem_top do mem[k]:=mem[lo_mem_max]; {clear list heads} @; avail:=null; mem_end:=mem_top; hi_mem_min:=hi_mem_stat_min; {initialize the one-word memory} var_used:=lo_mem_stat_max+1-mem_bot; dyn_used:=mem_top+1-hi_mem_stat_min; {initialize statistics} @z @x module 165 @t\hskip1em@>@!was_mem_end: pointer; {previous |mem_end|} @y @t\hskip1em@>@!was_mem_end,@!was_lo_max,@!was_hi_min: pointer; {previous |mem_end|, |lo_mem_max|,and |hi_mem_min|} @z @x module 166 @!debug was_mem_end:=mem_base; {indicate that everything was previously free} @y @!debug was_mem_end:=mem_min; {indicate that everything was previously free} was_lo_max:=mem_min; was_hi_min:=mem_max; @z @x module 167 begin for p:=mem_base to mem_end do free[p]:=false; {you can probably do this faster} @y begin for p:=mem_min to lo_mem_max do free[p]:=false; {you can probably do this faster} for p:=hi_mem_min to mem_end do free[p]:=false; {ditto} @z @x module 167 for p:=0 to mem_end do was_free[p]:=free[p]; {|was_free:=free| might be faster} was_mem_end:=mem_end; @y for p:=mem_min to lo_mem_max do was_free[p]:=free[p]; for p:=hi_mem_min to mem_end do was_free[p]:=free[p]; {|was_free:=free| might be faster} was_mem_end:=mem_end; was_lo_max:=lo_mem_max; was_hi_min:=hi_mem_min; @z @x module 168 begin if (p>mem_end)or(pmem_end)or(p=hi_mem_base)or(p=hi_mem_base)or(rlink(p)hi_mem_base)or@| (llink(rlink(p))<>p) then clobbered:=true; @y repeat if (p>=lo_mem_max)or(p=lo_mem_max)or(rlink(p)lo_mem_max)or@| (llink(rlink(p))<>p) then clobbered:=true; @z @x module 170 p:=mem_base; while p<=hi_mem_base do {node |p| should not be empty} @y p:=mem_min; while p<=lo_mem_max do {node |p| should not be empty} @z @x module 170 while (p<=hi_mem_base) and not free[p] do incr(p); while (p<=hi_mem_base) and free[p] do incr(p); @y while (p<=lo_mem_max) and not free[p] do incr(p); while (p<=lo_mem_max) and free[p] do incr(p); @z @x module 171 for p:=mem_base to mem_end do if not free[p] and ((p>was_mem_end) or was_free[p]) then @y for p:=mem_min to lo_mem_max do if not free[p] and ((p>was_lo_max) or was_free[p]) then begin print_char(" "); print_int(p); end; for p:=hi_mem_min to mem_end do if not free[p] and ((pwas_mem_end) or was_free[p]) then @z @x module 172 begin for q:=mem_base to mem_end do @y begin for q:=mem_min to lo_mem_max do @z @x module 172 @; @y for q:=hi_mem_min to mem_end do begin if link(q)=p then begin print_nl("LINK("); print_int(q); print_char(")"); end; if info(q)=p then begin print_nl("INFO("); print_int(q); print_char(")"); end; end; @; @z @x module 176 if (pmem_end) then print_esc("CLOBBERED.") @y if (pmem_end) then print_esc("CLOBBERED.") @z @x module 178 begin if (p=hi_mem_base) then print_char("*") @y begin if (p=lo_mem_max) then print_char("*") @z @x module 293 if (pmem_end) then @y if (pmem_end) then @z @x module 639 print_int(dyn_used); print("; max so far: "); print_int(max_var_used); print_char("&"); print_int(mem_end+1-hi_mem_base); print_ln; @y print_int(dyn_used); print("; still untouched: "); print_int(hi_mem_min-lo_mem_max-1); print_ln; @z @x module 857 begin save_link:=link(cur_p); {this is OK even if |cur_p=null|} link(cur_p):=null; print_nl(""); short_display(link(printed_node)); link(cur_p):=save_link; printed_node:=cur_p; @y begin print_nl(""); if cur_p=null then short_display(link(printed_node)) else begin save_link:=link(cur_p); link(cur_p):=null; print_nl(""); short_display(link(printed_node)); link(cur_p):=save_link; end; printed_node:=cur_p; @z @x module 1249 if 2*max_halfwordhi_mem_base then goto bad_fmt; @y if x<>mem_bot then goto bad_fmt; undump_int(x); if x<>mem_top then goto bad_fmt; @z @x module 1311 dump_int(rover); p:=mem_base; q:=rover; x:=0; @y dump_int(lo_mem_max); dump_int(rover); p:=mem_bot; q:=rover; x:=0; @z @x module 1311 var_used:=var_used+hi_mem_base-p; dyn_used:=mem_end+1-hi_mem_base;@/ dump_int(mem_end); dump_int(avail); for k:=p to mem_end do dump_wd(mem[k]); x:=x+mem_end+1-p; @y var_used:=var_used+lo_mem_max-p; dyn_used:=mem_end+1-hi_mem_min;@/ for k:=p to lo_mem_max do dump_wd(mem[k]); x:=x+lo_mem_max+1-p; dump_int(hi_mem_min); dump_int(avail); for k:=hi_mem_min to mem_end do dump_wd(mem[k]); x:=x+mem_end+1-hi_mem_min; @z @x module 1312 undump(min_halfword)(hi_mem_base)(rover); p:=mem_base; q:=rover; x:=0; repeat for k:=p to q+1 do undump_wd(mem[k]); p:=q+node_size(q); if (p>hi_mem_base)or((q>=rlink(q))and(rlink(q)<>rover)) then goto bad_fmt; q:=rlink(q); until q=rover; undump_size(hi_mem_base)(mem_max)('mem max')(mem_end); undump(null)(mem_end)(avail); for k:=p to mem_end do undump_wd(mem[k]); undump_int(var_used); undump_int(dyn_used); max_var_used:=var_used @y undump(lo_mem_stat_max+1000)(hi_mem_stat_min-1)(lo_mem_max); undump(lo_mem_stat_max+1)(lo_mem_max)(rover); p:=mem_bot; q:=rover; x:=0; repeat for k:=p to q+1 do undump_wd(mem[k]); p:=q+node_size(q); if (p>lo_mem_max)or((q>=rlink(q))and(rlink(q)<>rover)) then goto bad_fmt; q:=rlink(q); until q=rover; for k:=p to lo_mem_max do undump_wd(mem[k]); if mem_minmax_halfword!] @x module 111 if (mem_min=max_halfword) then bad:=14; @y if (mem_min=max_halfword)or@| (mem_bot-mem_min>max_halfword+1) then bad:=14; @z @x module 125 @!t:pointer; {temporary register} @y @!t:integer; {temporary register} @z @x module 125 if lo_mem_max+2mem_bot+max_halfword then t:=mem_bot+max_halfword; rlink(q):=rover; llink(q):=p; link(q):=empty_flag; node_size(q):=t-lo_mem_max;@/ @z 302. Improvement to missing-format-file error (DRF, 5 Jan 85) @x module 524 var j:0..buf_size; {the first space after the file name} begin if buffer[loc]="&" then begin incr(loc); j:=loc; buffer[last]:=" "; while buffer[j]<>" " do incr(j); pack_buffered_name(0,loc,j-1); {try first without the system file area} if w_open_in(fmt_file) then begin loc:=j; goto found; end;@/ pack_buffered_name(format_area_length,loc,j-1); {now try the system format file area} if w_open_in(fmt_file) then begin loc:=j; goto found; end; wake_up_terminal; wterm_ln('Sorry, I can''t find that format;',' will try PLAIN.'); @.Sorry, I can't find...@> end; {now pull out all the stops: try for the system \.{PLAIN} file} pack_buffered_name(format_default_length-format_ext_length,1,0); if not w_open_in(fmt_file) then begin wake_up_terminal; wterm_ln('I can''t find the PLAIN format file!'); @.I can't find PLAIN...@> @.PLAIN@> open_fmt_file:=false; return; end; found:open_fmt_file:=true; @y var j:0..buf_size; {the first space after the format file name} begin j:=loc; if buffer[loc]="&" then begin incr(loc); j:=loc; buffer[last]:=" "; while buffer[j]<>" " do incr(j); pack_buffered_name(0,loc,j-1); {try first without the system file area} if w_open_in(fmt_file) then goto found; pack_buffered_name(format_area_length,loc,j-1); {now try the system format file area} if w_open_in(fmt_file) then goto found; wake_up_terminal; wterm_ln('Sorry, I can''t find that format;',' will try PLAIN.'); @.Sorry, I can't find...@> update_terminal; end; {now pull out all the stops: try for the system \.{PLAIN} file} pack_buffered_name(format_default_length-format_ext_length,1,0); if not w_open_in(fmt_file) then begin wake_up_terminal; wterm_ln('I can''t find the PLAIN format file!'); @.I can't find PLAIN...@> @.PLAIN@> open_fmt_file:=false; return; end; found:loc:=j; open_fmt_file:=true; @z 303. Welcoming message appears sooner (DRF, Jan 7) @x module 61 else begin print(format_ident); print_ln; end; @y else begin print(format_ident); print_ln; end; update_terminal; @z 304. Minor change to help message in "confusion" (Jan 23) @x module 95 help2("One of your earlier faux pas has wounded me deeply,")@/ ("so I'm barely conscious. Please fix it and try again."); @y help2("One of your faux pas seems to have wounded me deeply...")@/ ("in fact, I'm barely conscious. Please fix it and try again."); @z 305. Improved logic for `(see the transcript file...)' (Jan 23) @x module 245 if history=spotless then history:=warning_issued; if (tracing_online<=0)and(selector=term_and_log) then decr(selector); @y if (tracing_online<=0)and(selector=term_and_log) then begin decr(selector); if history=spotless then history:=warning_issued; end; @z 306. Change 291 violated standard PASCAL (CET1, Feb 18) @x module 331 for first:=0 to buf_size do buffer[first]:=0; @y since some procedures `threaten' |first| globally [BS/6192 sec 6.8.3.9] first:=buf_size; repeat buffer[first]:=0; decr(first); until first=0; @z 307. Nonexistent character could be output via ligature hyphenation (April 11) @x module 582 (slight inefficiency removed while correcting this) begin if (font_bc[f]<=c)and(font_ec[f]>=c) then @y begin if font_bc[f]<=c then if font_ec[f]>=c then @z @x module 892 (likewise) @!hu:array[1..63] of ASCII_code; {like |hc|, before conversion to lowercase} @y @!hu:array[1..63] of ASCII_code; {like |hc|, before conversion to lowercase} @!hyf_char:integer; {hyphen character of the relevant font} @z @x module 896 (likewise) done2: if hyphen_char[hf]<0 then goto done1; if hyphen_char[hf]>255 then goto done1; @y done2: hyf_char:=hyphen_char[hf]; if hyf_char<0 then goto done1; if hyf_char>255 then goto done1; @z @x module 912 and another local variable @!c:ASCII_code; {character temporarily replaced by a hyphen} @y @!c:ASCII_code; {character temporarily replaced by a hyphen} @!hyf_node:pointer; {the hyphen, if it exists} @z @x module 915 (this is the real bugfix) minor_tail:=null; c:=hu[i+1]; hu[i+1]:=hyphen_char[hf]; repeat l:=reconstitute(l+1,i+1); if minor_tail=null then pre_break(r):=link(hold_head) else link(minor_tail):=link(hold_head); minor_tail:=link(hold_head); if link(minor_tail)<>null then minor_tail:=link(minor_tail); until l>i; hu[i+1]:=c; {restore the character in the hyphen position} decr(l); hyf[l]:=0 @y minor_tail:=null; hyf_node:=new_character(hf,hyf_char); if hyf_node<>null then begin incr(i); c:=hu[i]; hu[i]:=hyf_char; end; repeat l:=reconstitute(l+1,i); if minor_tail=null then pre_break(r):=link(hold_head) else link(minor_tail):=link(hold_head); minor_tail:=link(hold_head); if link(minor_tail)<>null then minor_tail:=link(minor_tail); until l=i; if hyf_node<>null then begin hu[i]:=c; {restore the character in the hyphen position} free_avail(hyf_node); decr(i); l:=i; end; hyf[i]:=0 @z @x module 918 begin r:=new_disc; pre_break(r):=new_character(hf,hyphen_char[hf]); @y begin r:=new_disc; pre_break(r):=new_character(hf,hyf_char); @z 308. Improper memory usage computed by INITEX in change 300. (DRF, April 15) @x module 162 @d hi_mem_stat_min==mem_top-13 {smallest statically allocated word in the one-word |mem|} @y @d hi_mem_stat_min==mem_top-13 {smallest statically allocated word in the one-word |mem|} @d hi_mem_stat_usage=14 {the number of one-word nodes always present} @z @x module 164 (text macro without parentheses strikes again!) var_used:=lo_mem_stat_max+1-mem_bot; dyn_used:=mem_top+1-hi_mem_stat_min; @y var_used:=lo_mem_stat_max+1-mem_bot; dyn_used:=hi_mem_stat_usage; @z 309. A faster |flush_list| routine for the inner loop. (DRF, April 16) @x module 123 var q:pointer; {the successor of node |p|} begin while p<>null do begin q:=link(p); free_avail(p); p:=q; end; @y var @!q,@!r:pointer; {list traversers} begin if p<>null then begin r:=p; repeat q:=r; r:=link(r); @!stat decr(dyn_used);@+tats@/ until r=null; {now |q| is the last node on the list} link(q):=avail; avail:=p; end; @z 310. Kern for accent positioning could disappear after a line break (April 17) (Change 269 fixed only part of the problem!) @x module 155 @d explicit=1 {|subtype| of kern nodes from \.{\\kern} and \.{\\/} and accents} @y @d explicit=1 {|subtype| of kern nodes from \.{\\kern} and \.{\\/}} @d acc_kern=2 {|subtype| of kern nodes from accents} @z @x module 191 if subtype(p)<=explicit then begin print_esc("kern"); if subtype(p)=explicit then print_char(" "); print_scaled(width(p)); @y if subtype(p)<>mu_glue then begin print_esc("kern"); if subtype(p)<>normal then print_char(" "); print_scaled(width(p)); if subtype(p)=acc_kern then print(" (for accent)"); @.for accent@> @z @x module 837 math_node,kern_node: break_width[1]:=break_width[1]-width(s); @y math_node,kern_node: if subtype(s)=acc_kern then goto done else break_width[1]:=break_width[1]-width(s); @z @x module 879 if non_discardable(q) then goto done1; @y if non_discardable(q) then goto done1; if subtype(q)=acc_kern then if type(q)=kern_node then goto done1; @z @x module 1125 r:=new_kern(delta); subtype(r):=explicit; link(tail):=r; link(r):=p; tail:=new_kern(-a-delta); subtype(tail):=explicit; link(p):=tail; p:=q; @y r:=new_kern(delta); subtype(r):=acc_kern; link(tail):=r; link(r):=p; tail:=new_kern(-a-delta); subtype(tail):=acc_kern; link(p):=tail; p:=q; @z 311. \lastbox and \unkern must not remove discretionary replacements (April 18) (Change 236 introduced this bug!) @x module 1079 label exit; var p:pointer; {runs through the current list} @y label exit, done; var @!p,@!q:pointer; {run through the current list} @!m:quarterword; {the length of a replacement list} @z @x modules 1080 and 1081 @ else begin if not is_char_node(tail) then if (type(tail)=hlist_node)or(type(tail)=vlist_node) then begin p:=head; cur_box:=tail; shift_amount(cur_box):=0; while link(p)<>tail do p:=link(p); tail:=p; link(p):=null; end; end; end @ @= begin you_cant; help2("Sorry...I'm usually unable to take things from the current")@/ ("page. This \lastbox will therefore be void."); error; end @y begin you_cant; help2("Sorry...I usually can't take things from the current page.")@/ ("This \lastbox will therefore be void."); error; end else begin if not is_char_node(tail) then if (type(tail)=hlist_node)or(type(tail)=vlist_node) then @; end; end @ @= begin q:=head; repeat p:=q; if not is_char_node(q) then if type(q)=disc_node then begin for m:=1 to replace_count(q) do p:=link(p); if p=tail then goto done; end; q:=link(p); until q=tail; cur_box:=tail; shift_amount(cur_box):=0; tail:=p; link(p):=null; done: end @z @x module 1105 var p:pointer; {runs through the current list} @y label exit; var @!p,@!q:pointer; {run through the current list} @!m:quarterword; {the length of a replacement list} @z @x module 1105 begin p:=head; while link(p)<>tail do p:=link(p); link(p):=null; flush_node_list(tail); tail:=p; end; end; end; @y begin q:=head; repeat p:=q; if not is_char_node(q) then if type(q)=disc_node then begin for m:=1 to replace_count(q) do p:=link(p); if p=tail then return; end; q:=link(p); until q=tail; link(p):=null; flush_node_list(tail); tail:=p; end; end; exit:end; @z @x module 1106 help2("Sorry...I'm usually unable to take things from the current")@/ ("page. Try `I\vskip-\lastskip' instead."); if cur_chr=kern_node then help_line[0]:= ("page. Try `I\kern-\lastkern' instead.") else if cur_chr<>glue_node then help_line[0]:=@| ("page. Perhaps you can make the output routine do it."); @y help2("Sorry...I usually can't take things from the current page.")@/ ("Try `I\vskip-\lastskip' instead."); if cur_chr=kern_node then help_line[0]:= ("Try `I\kern-\lastkern' instead.") else if cur_chr<>glue_node then help_line[0]:=@| ("Perhaps you can make the output routine do it."); @z @x module 1120 if n<128 then replace_count(tail):=n @y if n<=max_quarterword then replace_count(tail):=n @z *** Note by DEK, 18 Apr 1985 (The code for version 1.3 has been published by Addison-Wesley under the title "TeX: The Program". It was phototypeset on our APS, but does not contain changes > 300. Some of those changes have been made in versions of TeX called 1.3; but the exact definition of version 1.3 is somewhat vague. Version 1.4 was released on April 18, 1985, after making change 311. At present I believe Version 1.4 will be identical to Version 2.0 except perhaps for things like index entries in the documentation and slightly revised help messages. Version 2.0 will coincide with the publication of Volume 1 of Computers and Typesetting, which will come out when METAFONT and Computer Modern are both finished.) Version 1.5 312. if nonstandard area specified, don't try TEX_area too. (DRF, 26 Apr 85) @x module 537 pack_file_name(cur_name,TEX_area,cur_ext); if a_open_in(cur_file) then goto done; @y if cur_area="" then begin pack_file_name(cur_name,TEX_area,cur_ext); if a_open_in(cur_file) then goto done; end; @z 313. length of \write need no longer be limited (cf 235). (NBT, 30 Apr 85) @x module 1370 show_token_list(link(def_ref),null,buf_size-10); print_ln; @y show_token_list(link(def_ref),null,10000000); print_ln; @z 314. bug introduced in #300, just lucky it didn't cause trouble (CET1, 8 May 85) @x module 162 @d active==mem_top-6 {head of active list in |line_break|, needs two words} @y @d active==mem_top-7 {head of active list in |line_break|, needs two words} @z 315. Missing eoln after last typeout (Gropp, 11 May 85) @x module 1332 wterm('Ouch---my internal constants have been', @y wterm_ln('Ouch---my internal constants have been', @z 316. Redundancy (CET1, 17 May 85) [Change 287 was apparently introduced because of a faulty assumption, although its change to the calling of "initialize" was valid.] @x module 1332 begin t_open_out; wterm_ln('Ouch---my internal constants have been', ' clobbered!---case ',bad:1); @y begin wterm_ln('Ouch---my internal constants have been clobbered!', '---case ',bad:1); @z 317. batchmode to see if log file couldn't be opened (DRF, 22 May 85) @x module 92 if interaction=batch_mode then decr(selector); if job_name=0 then open_log_file; @y if job_name=0 then open_log_file; if interaction=batch_mode then decr(selector); @z 318. If the string pool overflows while reading the command line... (22 May 85) [This bug was first found in METAFONT, when it could occur more easily] @x module 525 begin str_room(name_length); for k:=1 to name_length do append_char(xord[name_of_file[k]]); make_name_string:=make_string; @y begin if (pool_ptr+name_length>pool_size)or(str_ptr=max_strings) then make_name_string:="?" else begin for k:=1 to name_length do append_char(xord[name_of_file[k]]); make_name_string:=make_string; end; @z 319. Bug in \edef\foo{\iffalse\fi\the\toks0} (found by Dan Brotsky, 7 Aug 85) @x module 478 if cur_cmd<>the then goto done2; q:=the_toks; if link(temp_head)<>null then begin link(p):=link(temp_head); p:=q; end; @y if cur_cmd<=max_command then goto done2; if cur_cmd<>the then expand else begin q:=the_toks; if link(temp_head)<>null then begin link(p):=link(temp_head); p:=q; end; end; @z *** Version 1.5 was released on August 7, 1985. 320. Lowercase `plain' for consistency with the manual @x module 521 TEX_format_default:='TeXformats:PLAIN.fmt'; @.TeXformats@> @.PLAIN@> @y TEX_format_default:='TeXformats:plain.fmt'; @.TeXformats@> @.plain@> @z (index entries also changed to lowercase in modules 524, 1331) 321. Terminal woken up by \show and \showthe (November 27, 1985) @x module 1294 begin get_token; print_nl("> "); @y begin get_token; if interaction=error_stop_mode then wake_up_terminal; print_nl("> "); @z @x module 1297 begin p:=the_toks; print_nl("> "); token_show(temp_head); @y begin p:=the_toks; if interaction=error_stop_mode then wake_up_terminal; print_nl("> "); token_show(temp_head); @z Changes subsequent to `Version 2.0' as published in C&T, Volume B: 322. Trivial change to a help message. @x module 1283 ("Pretend that you're Hercule Poirot, examine all clues,")@/ @y ("Pretend that you're Hercule Poirot: Examine all clues,")@/ @z 323. Precaution since |index| can be as high as |max_in_open|. (DRF) @x module 14 if hash_prime>hash_size then bad:=5; @y if hash_prime>hash_size then bad:=5; if max_in_open>=128 then bad:=6; @z 324. \kern clobbered at end of pre-break list in discretionary break. @x module 881 |disc_break:=true|@>; if not is_char_node(q) then if (type(q)=math_node)or(type(q)=kern_node) then width(q):=0; @y |disc_break:=true|@> else if (type(q)=math_node)or(type(q)=kern_node) then width(q):=0; @z 325. width after discretionary didn't take account of discarded nodes. @x module 830 (slight redefinition) @!t:quarterword; {replacement count, if |cur_p| is a discretionary node} @y @!t:integer; {node count, if |cur_p| is a discretionary node} @z @x module 837 (slight rearrangement) if (break_type=unhyphenated)or(cur_p=null) then begin s:=cur_p; while s<>null do begin if is_char_node(s) then goto done; case type(s) of glue_node:@; penalty_node: do_nothing; math_node,kern_node: if subtype(s)=acc_kern then goto done else break_width[1]:=break_width[1]-width(s); othercases goto done endcases;@/ s:=link(s); end; end else @; @y s:=cur_p; if break_type>unhyphenated then if cur_p<>null then @; while s<>null do begin if is_char_node(s) then goto done; case type(s) of glue_node:@; penalty_node: do_nothing; math_node,kern_node: if subtype(s)=acc_kern then goto done else break_width[1]:=break_width[1]-width(s); othercases goto done endcases;@/ s:=link(s); end; @z @x module 840 (this is the main change to fix the bug) begin t:=replace_count(cur_p); s:=cur_p; while t>0 do begin decr(t); s:=link(s); @; end; s:=post_break(cur_p); while s<>null do begin @; @y begin t:=replace_count(cur_p); v:=cur_p; s:=post_break(cur_p); while t>0 do begin decr(t); v:=link(v); @; end; while s<>null do begin @; @z @x module 840, continued break_width[1]:=break_width[1]+disc_width; @y break_width[1]:=break_width[1]+disc_width; if t=0 then s:=link(v); {more nodes may also be discardable after the break} @z @x module 841 (here we just change |s| to |v|) @= if is_char_node(s) then begin f:=font(s); break_width[1]:=break_width[1]-char_width(f)(char_info(f)(character(s))); end else case type(s) of ligature_node: begin f:=font(lig_char(s));@/ break_width[1]:=@|break_width[1]- char_width(f)(char_info(f)(character(lig_char(s)))); end; hlist_node,vlist_node,rule_node,kern_node: break_width[1]:=break_width[1]-width(s); @y @= if is_char_node(v) then begin f:=font(v); break_width[1]:=break_width[1]-char_width(f)(char_info(f)(character(v))); end else case type(v) of ligature_node: begin f:=font(lig_char(v));@/ break_width[1]:=@|break_width[1]- char_width(f)(char_info(f)(character(lig_char(v)))); end; hlist_node,vlist_node,rule_node,kern_node: break_width[1]:=break_width[1]-width(v); @z @x module 842 hlist_node,vlist_node,rule_node,kern_node: break_width[1]:=break_width[1]+width(s); othercases confusion("disc2") @:this can't happen disc2}{\quad disc2@> endcases @y hlist_node,vlist_node,rule_node:break_width[1]:=break_width[1]+width(s); kern_node: if (t=0)and(subtype(s)<>acc_kern) then t:=-1 {discardable} else break_width[1]:=break_width[1]+width(s); othercases confusion("disc2") @:this can't happen disc2}{\quad disc2@> endcases; incr(t) @z *** Version 2.1 was released on January 26, 1987. 326. Removal of redundant code (found by Pat Monardo, 5 Feb 87) @x module 1224 [this change need not be made, since it has no effect] char_def_code: define(p,char_given,cur_val); math_char_def_code: define(p,math_given,cur_val); @y the cases cannot occur, so we simply don't list them @z 327. More robustness is needed when debugging (Ronaldo Am\'a, 14 Apr 87) @x module 174 begin while p>null do @y maybe mem_min>null (but nodes shouldn't be put in location mem_min exactly) begin while p>mem_min do @z @x module 182 @p procedure show_node_list(@!p:pointer); {prints a node list symbolically} @y @p procedure show_node_list(@!p:integer); {prints a node list symbolically} @z @x module 182, continued while p>null do @y while p>mem_min do @z 328. Storage allocation can be more elegant and efficient (4/21/87) @x module 127 if r=p then if ((rlink(p)<>rover) or (llink(p)<>rover)) then @y if r=p then if rlink(p)<>p then @z 329. Miscalculation of empty-line condition (April 22, 1987) @x module 360 begin if limit=start then {previous line was empty} @y begin if (end_line_char<0)or(end_line_char>127) then incr(limit); if limit=start then {previous line was empty} @z 330. A case where we don't have to assume system bookkeeping (April 28, 1987) @x module 560 done: b_close(tfm_file); read_font_info:=g; @y [suggested by Jim Sterken] done: if file_opened then b_close(tfm_file); read_font_info:=g; @z [this was not a bug, according to the comment in module 28] 331. jump_out must fix unfinished output (Found by Klaus Gunterman, 3 Aug 87) @x module 593 doing_leaders:=false; dead_cycles:=0; @y doing_leaders:=false; dead_cycles:=0; cur_s:=-1; @z @x module 617 cur_s:=-1; ensure_dvi_open; @y ensure_dvi_open; @z @x module 640 dvi_out(eop); incr(total_pages); @y dvi_out(eop); incr(total_pages); cur_s:=-1; @z @x module 642 if total_pages=0 then print_nl("No pages of output.") @y while cur_s>-1 do begin if cur_s>0 then dvi_out(pop) else begin dvi_out(eop); incr(total_pages); end; decr(cur_s); end; if total_pages=0 then print_nl("No pages of output.") @z 332. \hangindent=1pt$$\halign{...\cr\noalign{\hrule}}$$ problem (19 Aug 87) @x module 805 q:=link(head); @y q:=link(head); s:=head; @z @x module 805, continued q:=link(q); @y s:=q; q:=link(q); @z @x module 806 if is_running(depth(q)) then depth(q):=depth(p); @y if is_running(depth(q)) then depth(q):=depth(p); if o<>0 then begin r:=link(q); link(q):=null; q:=hpack(q,natural); shift_amount(q):=o; link(q):=r; link(s):=q; end; @z 333. \hskip 0pt plus 1fil\ifdim problem (found by Alan Guth, 20 Aug 87) @x module 366 @!cvl_backup,@!radix_backup:small_number; {to save |cur_val_level| and |radix|} @y @!cvl_backup,@!radix_backup,@!co_backup:small_number; {to save |cur_val_level|, etc.} @z @x backup_backup:=link(backup_head); @y co_backup:=cur_order; backup_backup:=link(backup_head); @z @x link(backup_head):=backup_backup; @y cur_order:=co_backup; link(backup_head):=backup_backup; @z 334. leaders too sensitive near exact multiples (M. F. Bridgland, 9 Nov 87) @x module 626 begin edge:=cur_h+rule_wd; lx:=0; @y begin rule_wd:=rule_wd+10; {compensate for floating-point rounding} edge:=cur_h+rule_wd; lx:=0; @z @x ibid cur_h:=edge; goto next_p; @y cur_h:=edge-10; goto next_p; @z @x module 635 begin edge:=cur_v+rule_ht; lx:=0; @y begin rule_ht:=rule_ht+10; {compensate for floating-point rounding} edge:=cur_v+rule_ht; lx:=0; @z @x ibid cur_v:=edge; goto next_p; @y cur_v:=edge-10; goto next_p; @z 335. Glitch in fixed-point multiplication of negatives (W.G. Sullivan, 17Nov87) @x module 572 begin alpha:=16*z; beta:=16; while z>=@'40000000 do begin z:=z div 2; beta:=beta div 2; end; @y begin alpha:=16; while z>=@'40000000 do begin z:=z div 2; alpha:=alpha+alpha; end; beta:=256 div alpha; alpha:=alpha*z; @z 336. If there are no \patterns and some \lccode is 1 (Breitenlohner, 12Dec87) @x module 952 trie_link(0):=0; trie_char(0):=0; trie_op(0):=0; @y trie_link(0):=0; trie_char(0):=0; trie_op(0):=min_quarterword; @z 337. \csname might encounter undefined_cs in a group (Chris Thompson, 23Dec87) @x module 372 begin eqtb[cur_cs]:=eqtb[frozen_relax]; @y begin eq_define(cur_cs,relax,256); @z 338. \outer\def\a0{}\a\a shows temp_head list garbage (Silvio Levy, 20Apr88) @x module 391 repeat if (info(r)>match_token+127)or(info(r)match_token+127)or(info(r)str_start[str_ptr] do begin decr(pool_ptr); str_pool[pool_ptr+l]:=str_pool[pool_ptr]; end; {move current string up to make room for another} for k:=j to j+l-1 do append_char(buffer[k]); text(p):=make_string; pool_ptr:=pool_ptr+d; @z 340. Make patterns work when trie_min=0 (Peter Breitenlohner, 10May88) @x module 951 trie_max:=128; trie_min:=128; trie_link(0):=1; trie_taken[0]:=false; @y trie_max:=128; trie_min:=128; trie_link(0):=1; trie_taken[0]:=false; trie_link(trie_size):=0; trie_back(0):=trie_size; {wrap around} @z @x module 953 begin c:=trie_c[p]; {we have |c>0|} if c=ident_val then @ else begin old_setting:=selector; selector:=new_string; @y @!b:pool_pointer; {base of temporary string} begin get_x_token; scan_something_internal(tok_val,false); if cur_val_level>=ident_val then @ else begin old_setting:=selector; selector:=new_string; b:=pool_ptr; @z @x module 465, continued selector:=old_setting; the_toks:=str_toks; @y selector:=old_setting; the_toks:=str_toks(b); @z @x module 470 begin c:=cur_chr; @; old_setting:=selector; selector:=new_string; @; selector:=old_setting; link(garbage):=str_toks; ins_list(link(temp_head)); @y @!b:pool_pointer; {base of temporary string} begin c:=cur_chr; @; old_setting:=selector; selector:=new_string; b:=pool_ptr; @; selector:=old_setting; link(garbage):=str_toks(b); ins_list(link(temp_head)); @z 343. **\input\romannumeral6 confusion bypassed (25May88) @x module 525 begin if (pool_ptr+name_length>pool_size)or(str_ptr=max_strings) then @y begin if (pool_ptr+name_length>pool_size)or(str_ptr=max_strings)or (cur_length>0) then @z 344. Avoid negative dividend rounding upward (Chris Thompson, fixed 19Jun88) @x module 126 else t:=(lo_mem_max+hi_mem_min+2) div 2; {|lo_mem_max+2<=t=1998 then t:=lo_mem_max+1000 @z 346. An omission from change 333 (Tsunetoshi Hayashi, reported 20June88) @x module 439 cur_val:=0; cur_val_level:=int_val; radix:=0; @y cur_val:=0; cur_val_level:=int_val; radix:=0; cur_order:=0; @z 347. Avoid fatal_error after terminal eof (Tim Morgan, reported 25Oct88) @x module 71 [serious problem occurred if this was called in open_log_file] if not input_ln(term_in,true) then fatal_error("End of file on the terminal!"); @y if not input_ln(term_in,true) then t_open_in; @z 348. Force terminal output when open_log_file aborts (6Nov88) @x module 535 begin print_err("I can't write on file `"); @y begin selector:=term_only; print_err("I can't write on file `"); @z 349. By popular request, undo #347 and fix the bug a more complex way. @x module 71 [this undoes change #347] if not input_ln(term_in,true) then t_open_in; @y if not input_ln(term_in,true) then fatal_error("End of file on the terminal!"); @z @x module 92 [now we get to the new stuff] begin if job_name>0 then selector:=term_and_log @y begin if log_opened then selector:=term_and_log @z @x module 93 error; @y if log_opened then error; @z @x module 527 @!job_name:str_number; {principal file name} @y @!job_name:str_number; {principal file name} @!log_opened:boolean; {has the transcript file been opened?} @z @x module 528 @=job_name:=0; name_in_progress:=false; @y @= job_name:=0; name_in_progress:=false; log_opened:=false; @z @x module 534 selector:=log_only; @y selector:=log_only; log_opened:=true; @z @x module 535 begin if interaction print_file_name(cur_name,cur_area,cur_ext); print("'.");@/ job_name:=0; history:=fatal_error_stop; jump_out; end; {abort the program without a log file} @y begin selector:=term_only; @z @x module 1265 [this change is optional, but it's a slight improvement] if job_name<>0 then selector:=selector+2; @y if log_opened then selector:=selector+2; @z @x module 1333 if job_name>0 then @y if log_opened then @z @x module 1334 if job_name>0 then {the log file is open} @y if log_opened then @z 350. Forgotten update in error recovery (Breitenlohner, 20 Jan 89) @x module 976 glue_ptr(p):=r; @y glue_ptr(p):=r; q:=r; @z @x module 1004 glue_ptr(p):=r; @y glue_ptr(p):=r; q:=r; @z 351. Avoid error \aftergroup\relax\dump (Mittelbach&Schoepf, 17 Feb 89) @x module 280 begin check_full_save_stack; save_type(save_ptr):=insert_token; save_level(save_ptr):=level_zero; save_index(save_ptr):=t; incr(save_ptr); @y begin if cur_level>level_one then begin check_full_save_stack; save_type(save_ptr):=insert_token; save_level(save_ptr):=level_zero; save_index(save_ptr):=t; incr(save_ptr); end; @z 352. Cosmetic change to validate comment in 115 (Breitenlohner, 20 Mar 89) @x module 791 begin q:=link(cur_align); if (cur_align=null)or(q=null) then confusion("endv"); @y begin if cur_align=null then confusion("endv"); q:=link(cur_align);@+if q=null then confusion("endv"); @z 353. $$\begingroup\halign{#\cr}$$ caused confusion (Mittelbach, 7 Jun 89) @x module 1130 mmode+halign: if privileged then init_align; @y mmode+halign: if privileged then if cur_group=math_shift_group then init_align else off_save; @z 354. Conflict in global array dig with .5\ifdim.6 (Mittelbach, 20 Jun 89) @x module 450 @!k:small_number; {number of digits in a decimal fraction} @y @!k,@!kk:small_number; {number of digits in a decimal fraction} @!p,@!q:pointer; {top of decimal digit stack} @z @x module 452 begin k:=0; get_token; {|point_token| is being re-scanned} loop@+ begin get_x_token; if (cur_tok>zero_token+9)or(cur_tok=17| cannot affect the result} begin dig[k]:=cur_tok-zero_token; incr(k); end; end; done1: f:=round_decimals(k); @y begin k:=0; p:=null; get_token; {|point_token| is being re-scanned} loop@+ begin get_x_token; if (cur_tok>zero_token+9)or(cur_tok=17| cannot affect the result} begin q:=get_avail; link(q):=p; info(q):=cur_tok-zero_token; p:=q; incr(k); end; end; done1: for kk:=k downto 1 do begin dig[kk-1]:=info(p); q:=p; p:=link(p); free_avail(q); end; f:=round_decimals(k); @z 355. String startup problems (Wayne Sullivan, 17 Jul 89) @x module 31 (Warning: This affects most change files!) overflow("buffer size",buf_size); @:TeX capacity exceeded buffer size}{\quad buffer size@> @y @; @z @x module 35 consist of the remainder of the command line, after the part that invoked \TeX. @y consist of the remainder of the command line, after the part that invoked \TeX. The first line is special also because it may be read before \TeX\ has input a format file. In such cases, normal error messages cannot yet be given. The following code uses concepts that will be explained later. @= if format_ident=0 then begin write_ln(term_out,'Buffer size exceeded!'); goto final_end; @.Buffer size exceeded@> end else begin cur_input.loc_field:=first; cur_input.limit_field:=last-1; overflow("buffer size",buf_size); @:TeX capacity exceeded buffer size}{\quad buffer size@> end @z @x module 1310 k:=pool_ptr-4; undump_four_ASCII @y k:=pool_ptr-4; undump_four_ASCII; init_str_ptr:=str_ptr; init_pool_ptr:=pool_ptr @z @x module 1332 tini@/ @y init_str_ptr:=str_ptr; init_pool_ptr:=pool_ptr; fix_date_and_time; tini@/ @z @x module 1332 init_str_ptr:=str_ptr; init_pool_ptr:=pool_ptr;@/ @y @z 356. Allow integer products to be 31 bits long (Mittelbach, 16 Aug 89) @x module 105 @p function nx_plus_y(@!n:integer;@!x,@!y:scaled):scaled; begin if n<0 then begin negate(x); negate(n); end; if n=0 then nx_plus_y:=y else if ((x<=(@'7777777777-y) div n)and(-x<=(@'7777777777+y) div n)) then nx_plus_y:=n*x+y else begin arith_error:=true; nx_plus_y:=0; end; end; @y @d nx_plus_y(#)==mult_and_add(#,@'7777777777) @d mult_integers(#)==mult_and_add(#,0,@'17777777777) @p function mult_and_add(@!n:integer;@!x,@!y,@!max_answer:scaled):scaled; begin if n<0 then begin negate(x); negate(n); end; if n=0 then mult_and_add:=y else if ((x<=(max_answer-y) div n)and(-x<=(max_answer+y) div n)) then mult_and_add:=n*x+y else begin arith_error:=true; mult_and_add:=0; end; end; @z @x module 1240 if q=multiply then cur_val:=nx_plus_y(eqtb[l].int,cur_val,0) @y if q=multiply then if p=int_val then cur_val:=mult_integers(eqtb[l].int,cur_val) else cur_val:=nx_plus_y(eqtb[l].int,cur_val,0) @z 357. Raise the maximum number of tokens normally shown (pointed out by John Lavagnino in TeXhax on 19 May 89; corrected on 31 Aug 89). @x module 295 begin if p<>null then show_token_list(link(p),null,1000); @y begin if p<>null then show_token_list(link(p),null,10000000); @z @x module 1370 (this part of the change is cosmetic only) show_token_list(link(def_ref),null,10000000); print_ln; @y token_show(def_ref); print_ln; @z 358. Like 353, but with $$\begingroup\eqno$$ (Mittelbach, 25 Jul 89) @x module 1140 mmode+eq_no: if privileged then start_eq_no; @y mmode+eq_no: if privileged then if cur_group=math_shift_group then start_eq_no else off_save; @z 359. Major extension to 8-bit character input. (These changes, and a few that follow, were discussed during the 10th TUG meeting and installed during the week of 10 Sep 1989. They bring the implementation of TeX82 up to date with international developments and experience, and I believe they mark the final development of this program into a completely stable system.) Several changes to the documentation (not the program) are omitted here. @x module 18 @!ASCII_code=0..127; {seven-bit numbers} @y @!ASCII_code=0..255; {eight-bit numbers} @z @x module 19 @d last_text_char=127 {ordinal number of the largest element of |text_char|} @= @!i:0..last_text_char; @y @d last_text_char=255 {ordinal number of the largest element of |text_char|} @= @!i:integer; @z @x module 21 xchr[0]:=' '; xchr[@'177]:=' '; {ASCII codes 0 and |@'177| do not appear in text} @y @z @x module 23 for i:=1 to @'37 do xchr[i]:=' '; @y changing ' ' to chr(i) here will allow all 8-bit characters to get in for i:=0 to @'37 do xchr[i]:=' '; for i:=@'177 to @'377 do xchr[i]:=' '; @z @x module 24 for i:=1 to @'176 do xord[xchr[i]]:=i; @y for i:=@'200 to @'377 do xord[xchr[i]]:=i; for i:=0 to @'176 do xord[xchr[i]]:=i; @z @x module 38 @= @!pool_pointer = 0..pool_size; {for variables that point into |str_pool|} @!str_number = 0..max_strings; {for variables that point into |str_start|} @ @= @!str_pool:packed array[pool_pointer] of ASCII_code; {the characters} @y [OK to make si(#)==#-128 and so(#)==#+128 (without parens) in change files] Some \PASCAL\ compilers won't pack integers into a single byte unless the integers lie in the range |-128..127|. To accommodate such systems we access the string pool only via macros that can easily be redefined. @d si(#) == # {convert from |ASCII_code| to |packed_ASCII_code|} @d so(#) == # {convert from |packed_ASCII_code| to |ASCII_code|} @= @!pool_pointer = 0..pool_size; {for variables that point into |str_pool|} @!str_number = 0..max_strings; {for variables that point into |str_start|} @!packed_ASCII_code = 0..255; {elements of |str_pool| array} @ @= @!str_pool:packed array[pool_pointer] of packed_ASCII_code; {the characters} @z @x module 42 begin str_pool[pool_ptr]:=#; incr(pool_ptr); @y begin str_pool[pool_ptr]:=si(#); incr(pool_ptr); @z @x module 45 begin if str_pool[j]<>buffer[k] then @y begin if so(str_pool[j])<>buffer[k] then @z @x module 47 var k,@!l:0..127; {small indices or counters} @y var k,@!l:0..255; {small indices or counters} @z @x module 47 @; @y @; @z @x module 48 @ @= for k:=0 to 127 do begin if (@) then begin append_char("^"); append_char("^"); if k<@'100 then append_char(k+@'100) else append_char(k-@'100); @y @ @d app_lc_hex(#)==l:=#; if l<10 then append_char(l+"0)@+else append_char(l-10+"a") @= for k:=0 to 255 do begin if (@) then begin append_char("^"); append_char("^"); if k<@'100 then append_char(k+@'100) else if k<@'200 then append_char(k-@'100) else begin app_lc_hex(k div 16); app_lc_hex(k mod 16); end; @z @x module 59 begin print_char(str_pool[j]); incr(j); @y begin print_char(so(str_pool[j])); incr(j); @z @x modules 59 and 60 else if s<128 then @y else if s<256 then @z @x module 60 begin print(str_pool[j]); incr(j); @y begin print(so(str_pool[j])); incr(j); @z @x module 63 if c>=0 then if c<128 then print(c); @y if c>=0 then if c<256 then print(c); @z @x module 68 @ In certain situations, \TeX\ prints either a standard visible ASCII character or its hexadecimal ASCII code. @p procedure print_ASCII(@!c:integer); {prints a character or its code} begin if (c>=0) and (c<=127) then print(c) else begin print_char("["); if c<0 then print_int(c)@+else print_hex(c); print_char("]"); end; end; @y @ Old versions of \TeX\ needed a procedure called |print_ASCII| whose function is now subsumed by |print|. We retain the old name here as a possible aid to future software arch\ae ologists. @d print_ASCII == print @z @x module 69 begin print_char(str_pool[j]); n:=n-v; end; if n<=0 then return; {nonpositive input produces no output} k:=j+2; u:=v div (str_pool[k-1]-"0"); if str_pool[k-1]="2" then begin k:=k+2; u:=u div (str_pool[k-1]-"0"); end; if n+u>=v then begin print_char(str_pool[k]); n:=n+u; end else begin j:=j+2; v:=v div (str_pool[j-1]-"0"); @y begin print_char(so(str_pool[j])); n:=n-v; end; if n<=0 then return; {nonpositive input produces no output} k:=j+2; u:=v div (so(str_pool[k-1])-"0"); if str_pool[k-1]=si("2") then begin k:=k+2; u:=u div (so(str_pool[k-1])-"0"); end; if n+u>=v then begin print_char(so(str_pool[k])); n:=n+u; end else begin j:=j+2; v:=v div (so(str_pool[j-1])-"0"); @z @x module 70 begin print_char(str_pool[j]); incr(j); @y begin print_char(so(str_pool[j])); incr(j); @z @x module 222 @d single_base=active_base+128 {equivalents of one-letter control sequences} @d null_cs=single_base+128 {equivalent of \.{\\csname\\endcsname}} @y @d single_base=active_base+256 {equivalents of one-character control sequences} @d null_cs=single_base+256 {equivalent of \.{\\csname\\endcsname}} @z @x module 230 {table of 128 command codes (the ``catcodes'')} @d lc_code_base=cat_code_base+128 {table of 128 lowercase mappings} @d uc_code_base=lc_code_base+128 {table of 128 uppercase mappings} @d sf_code_base=uc_code_base+128 {table of 128 spacefactor mappings} @d math_code_base=sf_code_base+128 {table of 128 math mode mappings} @d int_base=math_code_base+128 {beginning of region 5} @y {table of 256 command codes (the ``catcodes'')} @d lc_code_base=cat_code_base+256 {table of 256 lowercase mappings} @d uc_code_base=lc_code_base+256 {table of 256 uppercase mappings} @d sf_code_base=uc_code_base+256 {table of 256 spacefactor mappings} @d math_code_base=sf_code_base+256 {table of 256 math mode mappings} @d int_base=math_code_base+256 {beginning of region 5} @z @x module 232 for k:=0 to 127 do @y for k:=0 to 255 do @z @x module 236 @d del_code_base=count_base+256 {128 delimiter code mappings} @d dimen_base=del_code_base+128 {beginning of region 6} @y @d del_code_base=count_base+256 {256 delimiter code mappings} @d dimen_base=del_code_base+256 {beginning of region 6} @z @x module 240 for k:=0 to 127 do del_code(k):=-1; @y for k:=0 to 255 do del_code(k):=-1; @z @x module 264 begin if s<128 then cur_val:=s+single_base @y begin if s<256 then cur_val:=s+single_base @z @x ibid for j:=0 to l-1 do buffer[j]:=str_pool[k+j]; @y for j:=0 to l-1 do buffer[j]:=so(str_pool[k+j]); @z @x module 289 @d cs_token_flag==@'10000 {amount added to the |eqtb| location in a token that stands for a control sequence; is a multiple of~256} @y @d cs_token_flag==@'7777 {amount added to the |eqtb| location in a token that stands for a control sequence; is a multiple of~256, less~1} @z @x module 293 if (info(p)<0)or(c>127) then print_esc("BAD.") @y if info(p)<0 then print_esc("BAD.") @z @x module 341 @!cat:0..15; {|cat_code(cur_chr)|, usually} @y @!cat:0..15; {|cat_code(cur_chr)|, usually} @!c,@!cc:ASCII_code; {constituents of a possible expanded code} @!d:2..3; {number of excess characters in an expanded code} @z @x module 352 @= begin if (cur_chr=buffer[loc])and(loc="0")and(#<="9"))or((#>="a")and(#<="f"))) @d hex_to_cur_chr== if c<="9" then cur_chr:=c-"0" @+else cur_chr:=c-"a"+10; if cc<="9" then cur_chr:=16*cur_chr+cc-"0" else cur_chr:=16*cur_chr+cc-"a"+10 @= begin if cur_chr=buffer[loc] then if loc2 then begin hex_to_cur_chr; buffer[k-1]:=cur_chr; end else if c<@'100 then buffer[k-1]:=c+@'100 else buffer[k-1]:=c-@'100; limit:=limit-d; first:=first-d; while k<=limit do begin buffer[k]:=buffer[k+d]; incr(k); end; goto start_cs; end; end; @z @x module 360 There is one more branch. @y There is one more branch. @d end_line_char_inactive == (end_line_char<0)or(end_line_char>255) @z @x ibid if (end_line_char<0)or(end_line_char>127) then decr(limit) @y if end_line_char_inactive then decr(limit) @z @x modules 362 and 483 and 538 and 1337 if (end_line_char<0)or(end_line_char>127) then decr(limit) @y if end_line_char_inactive then decr(limit) @z @x module 391 if (info(r)>match_token+127)or(info(r)match_token+255)or(info(r)= procedure scan_seven_bit_int; begin scan_int; if (cur_val<0)or(cur_val>127) then begin print_err("Bad character code"); @.Bad character code@> help2("The numeric code for a character must be between 0 and 127.")@/ ("I changed this one to zero."); int_error(cur_val); cur_val:=0; end; end; @y |scan_something_internal|. @z (and I'll interchange modules 434 and 435) @x module 442 if cur_val>127 then @y if cur_val>255 then @z @x module 464 begin t:=str_pool[k]; @y begin t:=so(str_pool[k]); @z @x module 506 (correction needed twice) if (cur_cmd>active_char)or(cur_chr>127) then @y if (cur_cmd>active_char)or(cur_chr>255) then @z @x module 519 for j:=str_start[a] to str_start[a+1]-1 do append_to_name(str_pool[j]); for j:=str_start[n] to str_start[n+1]-1 do append_to_name(str_pool[j]); for j:=str_start[e] to str_start[e+1]-1 do append_to_name(str_pool[j]); @y for j:=str_start[a] to str_start[a+1]-1 do append_to_name(so(str_pool[j])); for j:=str_start[n] to str_start[n+1]-1 do append_to_name(so(str_pool[j])); for j:=str_start[e] to str_start[e+1]-1 do append_to_name(so(str_pool[j])); @z @x module 526 if (cur_cmd>active_char)or(cur_chr>127) then @y if (cur_cmd>active_char)or(cur_chr>255) then @z @x module 603 (change to be made twice) dvi_out(str_pool[k]); @y dvi_out(so(str_pool[k])); @z @x module 617 for s:=str_start[str_ptr] to pool_ptr-1 do dvi_out(str_pool[s]); @y for s:=str_start[str_ptr] to pool_ptr-1 do dvi_out(so(str_pool[s])); @z @x module 766 begin case str_pool[r_type*8+t+magic_offset] of @y begin case so(str_pool[r_type*8+t+magic_offset]) of @z @x module 780 @d span_code=128 {distinct from any character} @d cr_code=129 {distinct from |span_code| and from any character} @y @d span_code=256 {distinct from any character} @d cr_code=257 {distinct from |span_code| and from any character} @z @x module 815 label done,done1,done2,done3,done4; @y label done,done1,done2,done3,done4,continue; @z @x module 896 else if (type(s)=kern_node)and(subtype(s)=normal) then c:=128 else if type(s)=whatsit_node then c:=128 else goto done1; if c<128 then if lc_code(c)<>0 then if (lc_code(c)=c)or(uc_hyph>0) then goto done2 else goto done1; s:=link(s); @y else if (type(s)=kern_node)and(subtype(s)=normal) then goto continue else if type(s)=whatsit_node then goto continue else goto done1; if lc_code(c)<>0 then if (lc_code(c)=c)or(uc_hyph>0) then goto done2 else goto done1; continue: s:=link(s); @z @x module 897 if c>=128 then goto done3; if (lc_code(c)=0)or(hn=63) then goto done3; hb:=s; incr(hn); hu[hn]:=c; hc[hn]:=lc_code(c)-1; @y if lc_code(c)=0 then goto done3; if hn=63 then goto done3; hb:=s; incr(hn); hu[hn]:=c; hc[hn]:=lc_code(c); @z @x module 898 if c>=128 then goto done3; if (lc_code(c)=0)or(j=63) then goto done3; incr(j); hu[j]:=c; hc[j]:=lc_code(c)-1;@/ @y if lc_code(c)=0 then goto done3; if j=63 then goto done3; incr(j); hu[j]:=c; hc[j]:=lc_code(c);@/ @z @x module 923 hc[0]:=127; hc[hn+1]:=127; hc[hn+2]:=128; {insert delimiters} @y hc[0]:=0; hc[hn+1]:=0; hc[hn+2]:=256; {insert delimiters} @z @x ibid while hc[l]=trie_char(z) do @y while hc[l]=qo(trie_char(z)) do @z @x module 931 repeat if str_pool[u]hc[j] then goto done; @y repeat if so(str_pool[u])hc[j] then goto done; @z @x module 937 else begin if (cur_chr>127)or(lc_code(cur_chr)=0) then @y else begin if lc_code(cur_chr)=0 then @z @x ibid begin incr(n); hc[n]:=lc_code(cur_chr)-1; @y begin incr(n); hc[n]:=lc_code(cur_chr); @z @x module 945 @!init @!trie_c:packed array[trie_pointer] of ASCII_code; {characters to match} @y @!init @!trie_c:packed array[trie_pointer] of packed_ASCII_code; {characters to match} @z % In modules 951--954, change "127" to "255" and "128" to "256" @x module 952 trie_link(0):=0; trie_char(0):=0; trie_op(0):=min_quarterword; @y trie_link(0):=0; trie_char(0):=min_quarterword; trie_op(0):=min_quarterword; @z @x module 953 begin c:=trie_c[p]; @y begin c:=so(trie_c[p]); @z @x module 955 begin if trie_link(h+trie_c[q])=0 then goto not_found; @y begin if trie_link(h+so(trie_c[q]))=0 then goto not_found; @z @x module 956 repeat z:=h+trie_c[q]; trie_back(trie_link(z)):=trie_back(z); @y repeat z:=h+so(trie_c[q]); trie_back(trie_link(z)):=trie_back(z); @z @x module 959 begin q:=trie_l[p]; c:=trie_c[p]; trie_link(z+c):=trie_ref[q]; trie_char(z+c):=c; trie_op(z+c):=trie_o[p]; @y begin q:=trie_l[p]; c:=so(trie_c[p]); trie_link(z+c):=trie_ref[q]; trie_char(z+c):=qi(c); trie_op(z+c):=trie_o[p]; @z @x module 962 begin if cur_chr="." then cur_chr:=128 {edge-of-word delimiter} else begin cur_chr:=lc_code(cur_chr); if cur_chr=0 then begin print_err("Nonletter"); @.Nonletter@> help1("(See Appendix H.)"); error; cur_chr:=128; end; end; if k<63 then begin incr(k); hc[k]:=cur_chr-1; hyf[k]:=0; digit_sensed:=false; end; end else begin hyf[k]:=cur_chr-"0"; if k<63 then digit_sensed:=true; end @y begin if cur_chr="." then cur_chr:=0 {edge-of-word delimiter} else begin cur_chr:=lc_code(cur_chr); if cur_chr=0 then begin print_err("Nonletter"); @.Nonletter@> help1("(See Appendix H.)"); error; end; end; if k<63 then begin incr(k); hc[k]:=cur_chr; hyf[k]:=0; digit_sensed:=false; end; end else if k<63 then begin hyf[k]:=cur_chr-"0"; digit_sensed:=true; end; end @z @x module 963 while (p>0)and(c>trie_c[p]) do @y while (p>0)and(c>so(trie_c[p])) do @z @x ibid if (p=0)or(c=128 then c:=cur_chr else begin c:=ho(math_code(cur_chr)); @y letter,other_char,char_given: begin c:=ho(math_code(cur_chr)); @z @x module 1154 mmode+letter,mmode+other_char,mmode+char_given: if cur_chr<128 then set_math_char(ho(math_code(cur_chr))) else set_math_char(cur_chr); mmode+char_num: begin scan_char_num; cur_chr:=cur_val; if cur_chr<128 then set_math_char(ho(math_code(cur_chr))) else set_math_char(cur_chr); @y mmode+letter,mmode+other_char,mmode+char_given: set_math_char(ho(math_code(cur_chr))); mmode+char_num: begin scan_char_num; cur_chr:=cur_val; set_math_char(ho(math_code(cur_chr))); @z @x module 1232 p:=cur_chr; scan_seven_bit_int; p:=p+cur_val; scan_optional_equals; @y p:=cur_chr; scan_char_num; p:=p+cur_val; scan_optional_equals; @z @x module 1233 else n:=127 @y else n:=255 @z @x module 1289 begin if t>=cs_token_flag then t:=t-active_base; c:=t mod 256; if c<128 then if equiv(b+c)<>0 then t:=256*(t div 256)+equiv(b+c); if t>=cs_token_flag then info(p):=t+active_base else info(p):=t; @y begin c:=t mod 256; if equiv(b+c)<>0 then info(p):=t-c+equiv(b+c); @z @x module 1309 w.b0:=str_pool[k]; w.b1:=str_pool[k+1]; w.b2:=str_pool[k+2]; w.b3:=str_pool[k+3]; @y [often qi(so(x))=x, but not e.g. when "quarterwords" are two bytes] w.b0:=qi(so(str_pool[k])); w.b1:=qi(so(str_pool[k+1])); w.b2:=qi(so(str_pool[k+2])); w.b3:=qi(so(str_pool[k+3])); @z @x module 1310 str_pool[k]:=w.b0; str_pool[k+1]:=w.b1; str_pool[k+2]:=w.b2; str_pool[k+3]:=w.b3 @y str_pool[k]:=si(qo(w.b0)); str_pool[k+1]:=si(qo(w.b1)); str_pool[k+2]:=si(qo(w.b2)); str_pool[k+3]:=si(qo(w.b3)) @z @x module 1368 for k:=str_start[str_ptr] to pool_ptr-1 do dvi_out(str_pool[k]); @y for k:=str_start[str_ptr] to pool_ptr-1 do dvi_out(so(str_pool[k])); @z 360. Major change to allow multiple hyphenation tables. I've combined this with the code for a minor change: 361. New parameters \lefthyphenmin and \righthyphenmin. @x module 11 (affects most change files!) @!trie_size=8000; {space for hyphenation patterns; should be larger for \.{INITEX} than it is in production versions of \TeX} @y @!trie_size=8000; {space for hyphenation patterns; should be larger for \.{INITEX} than it is in production versions of \TeX} @!trie_op_size=500; {space for ``opcodes'' in the hyphenation patterns} @z @x module 212 known as |space_factor|; it holds the current space factor used in spacing calculations. In math mode, |aux| is also known as |incompleat_noad|; if @y known as |space_factor| and |clang|; it holds the current space factor used in spacing calculations, and the current language used for hyphenation. (The value of |clang| is undefined in restricted horizontal mode.) In math mode, |aux| is also known as |incompleat_noad|; if @z @x ibid @!pg_field,@!aux_field,@!ml_field: integer; @y @!pg_field,@!ml_field: integer; @!aux_field: memory_word; @z @x module 213 @d prev_depth==aux {the name of |aux| in vertical mode} @d space_factor==aux {the name of |aux| in horizontal mode} @d incompleat_noad==aux {the name of |aux| in math mode} @y @d prev_depth==aux.sc {the name of |aux| in vertical mode} @d space_factor==aux.hh.lh {part of |aux| in horizontal mode} @d clang==aux.hh.rh {the other part of |aux| in horizontal mode} @d incompleat_noad==aux.int {the name of |aux| in math mode} @z @x module 218 @!a:integer; {auxiliary} @y @!a:memory_word; {auxiliary} @z @x module 219 if a<=ignore_depth then print("ignored") else print_scaled(a); if nest[p].pg_field<>0 then begin print(", prevgraf "); print_int(nest[p].pg_field); print(" line"); if nest[p].pg_field<>1 then print_char("s"); end; end; 1: begin print_nl("spacefactor "); print_int(a); end; 2: if a<>null then begin print("this will be denominator of:"); show_box(a); @y if a.sc<=ignore_depth then print("ignored") else print_scaled(a.sc); if nest[p].pg_field<>0 then begin print(", prevgraf "); print_int(nest[p].pg_field); print(" line"); if nest[p].pg_field<>1 then print_char("s"); end; end; 1: begin print_nl("spacefactor "); print_int(a.hh.lh); if m>0 then if a.hh.rh>0 then begin print(", current language "); print_int(a.hh.rh); end; end; 2: if a.int<>null then begin print("this will be denominator of:"); show_box(a.int); @z @x modules 236--238 @d int_pars=50 {total number of integer parameters} @y @d language_code=50 {current hyphenation table} @d left_hyphen_min_code=51 {minimum left hyphenation fragment size} @d right_hyphen_min_code=52 {minimum right hyphenation fragment size} @d int_pars=53 {total number of integer parameters} @z and define/print these new parameters appropriately (mimicking new_line_char) @x module 418 else begin cur_val:=aux; if m=vmode then cur_val_level:=dimen_val@+else cur_val_level:=int_val; end @y else if m=vmode then begin cur_val:=prev_depth; cur_val_level:=dimen_val; end else begin cur_val:=space_factor; cur_val_level:=int_val; end @z @x module 775 begin mode:=-vmode; prev_depth:=nest[nest_ptr-2].aux_field; @y begin mode:=-vmode; prev_depth:=nest[nest_ptr-2].aux_field.sc; @z @x module 786 begin push_nest; mode:=(-hmode-vmode)-mode; aux:=0; @y begin push_nest; mode:=(-hmode-vmode)-mode; if mode=-hmode then space_factor:=0 @+else prev_depth:=0; @z @x module 863 loop@+ begin @; @y loop@+ begin if threshold>inf_bad then threshold:=inf_bad; if second_pass then @; @; @z @x module 891 passes on only about 5 per cent of the paragraphs. @y passes on only about 5 per cent of the paragraphs. @= begin @!init if trie_not_ready then init_trie; @+tini@;@/ l_hyf:=left_hyphen_min-1;@+if l_hyf<0 then l_hyf:=0; r_hyf:=right_hyphen_min-1;@+if r_hyf<0 then r_hyf:=0; min_hyf:=l_hyf+r_hyf+2; cur_lang:=0; end @z @x module 892 @!hyf_char:integer; {hyphen character of the relevant font} @y @!hyf_char:integer; {hyphen character of the relevant font} @!cur_lang:ASCII_code; {current hyphenation table of interest} @!l_hyf,@!r_hyf,@!min_hyf:integer; {limits on fragment sizes} @z @x module 894 begin s:=link(cur_p); @y begin if min_hyf>63 then goto done1; s:=link(cur_p); @z @x module 896 else if type(s)=whatsit_node then goto continue @y else if type(s)=whatsit_node then begin @; goto continue; end @z @x module 899 (title of this module also changes appropriately) if hn<5 then goto done1; @y if hn:=@t$p_1$@>| and then, for |1)|. Then set |hyf[l-hyf_distance[v]]:=@tmax@>( hyf[l-hyf_distance[v]], hyf_num[v])|, and |v:=hyf_next[v]|; repeat, if necessary, until |v=min_quarterword|. @y the letters in |hc[(l-k+1)..l@,]| of language |t|, we perform all of the required operations for this pattern by carrying out the following little program: Set |v:=trie_op(@t$z_k$@>)|. Then set |v:=v+op_start[t]|, |hyf[l-hyf_distance[v]]:=@tmax@>(hyf[l-hyf_distance[v]], hyf_num[v])|, and |v:=hyf_next[v]|; repeat, if necessary, until |v=min_quarterword|. @z @x module 921 @!hyf_distance:array[quarterword] of small_number; {position |k-j| of $n_j$} @!hyf_num:array[quarterword] of small_number; {value of $n_j$} @!hyf_next:array[quarterword] of quarterword; {continuation of this |trie_op|} @y @!hyf_distance:array[1..trie_op_size] of small_number; {position |k-j| of $n_j$} @!hyf_num:array[1..trie_op_size] of small_number; {value of $n_j$} @!hyf_next:array[1..trie_op_size] of quarterword; {continuation code} @!op_start:array[ASCII_code] of 0..trie_op_size; {offset for current language} @z @x module 922 @!v:quarterword; {an index into |hyf_distance|, etc.} @y @!v:integer; {an index into |hyf_distance|, etc.} @z @x module 923 for j:=0 to hn-2 do begin z:=hc[j]; l:=j; @y if trie_char(cur_lang+1)<>qi(cur_lang) then return; {no patterns for |cur_lang|} for j:=0 to hn-r_hyf do begin z:=trie_link(cur_lang+1)+hc[j]; l:=j; @z @x ibid found: hyf[1]:=0; hyf[hn-2]:=0; hyf[hn-1]:=0; hyf[hn]:=0 @y found: for j:=0 to l_hyf do hyf[j]:=0; for j:=0 to r_hyf do hyf[hn-j]:=0 @z @x module 924 repeat i:=l-hyf_distance[v]; @y repeat v:=v+op_start[cur_lang]; i:=l-hyf_distance[v]; @z @x module 930 h:=hc[1]; @y h:=hc[1]; incr(hn); hc[hn]:=cur_lang; @z @x ibid not_found: @y not_found: decr(hn) @z @x module 931 goto found; @y decr(hn); goto found; @z @x module 934 @p procedure new_hyph_exceptions; {enters new exceptions} label reswitch, exit, found, not_found, done; @y @d set_cur_lang==if language<=0 then cur_lang:=0 else if language>255 then cur_lang:=0 else cur_lang:=language @p procedure new_hyph_exceptions; {enters new exceptions} label reswitch, exit, found, not_found; @z @x ibid begin scan_left_brace; {a left brace must follow \.{\\hyphenation}} @y begin scan_left_brace; {a left brace must follow \.{\\hyphenation}} set_cur_lang; @z @x module 935 spacer,right_brace: begin if n>4 then @; @y spacer,right_brace: begin if n>1 then @; @z @x module 938 begin if n>1 then @y begin if n<63 then @z @x module 939 begin str_room(n); h:=0; @y begin incr(n); hc[n]:=cur_lang; str_room(n); h:=0; @z @x ibid loop@+ begin if p=null then goto done; if info(p); @y @; @z @x module 942 @p@!init @@; @y @= @!init @@; @z @x module 943 @d quarterword_diff=max_quarterword-min_quarterword @d trie_op_hash_size=quarterword_diff+quarterword_diff {double} @= @!init@! trie_op_hash:array[0..trie_op_hash_size] of quarterword; {trie op codes for triples} tini@;@/ @t\hskip1em@>@!trie_op_ptr:quarterword; {highest |trie_op| assigned} @y @= @!init@! trie_op_hash:array[-trie_op_size..trie_op_size] of 0..trie_op_size; {trie op codes for quadruples} @!trie_used:array[ASCII_code] of quarterword; {largest opcode used so far for this language} @!trie_op_lang:array[1..trie_op_size] of ASCII_code; {language part of a hashed quadruple} @!trie_op_val:array[1..trie_op_size] of quarterword; {opcode corresponding to a hashed quadruple} @!trie_op_ptr:0..trie_op_size; {number of stored ops so far} tini @z @x module 944 should be entirely replaced @y by the following code: @ It's tempting to remove the |overflow| stops in the following procedure; |new_trie_op| could return |min_quarterword| (thereby simply ignoring part of a hyphenation pattern) instead of aborting the job. However, that would lead to different hyphenation results on different installations of \TeX\ using the same patterns. The |overflow| stops are necessary for portability of patterns. @= function new_trie_op(@!d,@!n:small_number;@!v:quarterword):quarterword; label exit; var h:-trie_op_size..trie_op_size; {trial hash location} @!u:quarterword; {trial op code} @!l:0..trie_op_size; {pointer to stored data} begin h:=abs(n+313*d+361*v+1009*cur_lang) mod (trie_op_size+trie_op_size) - trie_op_size; loop@+ begin l:=trie_op_hash[h]; if l=0 then {empty position found for a new op} begin if trie_op_ptr=trie_op_size then overflow("pattern memory ops",trie_op_size); u:=trie_used[cur_lang]; if u=max_quarterword then overflow("pattern memory ops per language", max_quarterword-min_quarterword); incr(trie_op_ptr); incr(u); trie_used[cur_lang]:=u; hyf_distance[trie_op_ptr]:=d; hyf_num[trie_op_ptr]:=n; hyf_next[trie_op_ptr]:=v; trie_op_lang[trie_op_ptr]:=cur_lang; trie_op_hash[h]:=trie_op_ptr; trie_op_val[trie_op_ptr]:=u; new_trie_op:=u; return; end; if (hyf_distance[l]=d)and(hyf_num[l]=n)and(hyf_next[l]=v) and(trie_op_lang[l]=cur_lang) then begin new_trie_op:=trie_op_val[l]; return; end; if h>-trie_op_size then decr(h)@+else h:=trie_op_size; end; exit:end; @z @x module 945: move the code from this module into 946, and introduce new code: @y @ After |new_trie_op| has compressed the necessary opcode information, plenty of information is available to unscramble the data into the final form needed by our hyphenation algorithm. @= op_start[0]:=-min_quarterword; for j:=1 to 255 do op_start[j]:=op_start[j-1]+qo(trie_used[j-1]); for j:=1 to trie_op_ptr do trie_op_hash[j]:=op_start[trie_op_lang[j]]+trie_op_val[j]; {destination} for j:=1 to trie_op_ptr do while trie_op_hash[j]>j do begin k:=trie_op_hash[j];@/ t:=hyf_distance[k]; hyf_distance[k]:=hyf_distance[j]; hyf_distance[j]:=t;@/ t:=hyf_num[k]; hyf_num[k]:=hyf_num[j]; hyf_num[j]:=t;@/ t:=hyf_next[k]; hyf_next[k]:=hyf_next[j]; hyf_next[j]:=t;@/ trie_op_hash[j]:=trie_op_hash[k]; trie_op_hash[k]:=k; end @z @x module 949: Move this code to just after the new module 945! mentioned so far, let's write a procedure that does the initialization. @= procedure init_pattern_memory; {gets ready to build a linked trie} var h:0..trie_op_hash_size; {an index into |trie_op_hash|} @!p:trie_pointer; {an index into |trie_hash|} begin for h:=0 to trie_op_hash_size do trie_op_hash[h]:=min_quarterword; trie_op_ptr:=min_quarterword; trie_root:=0; trie_c[0]:=0; trie_ptr:=0; for p:=0 to trie_size do trie_hash[p]:=0; end; @y mentioned so far, let's write down the code that gets them started. @= for k:=-trie_op_size to trie_op_size do trie_op_hash[k]:=0; for k:=0 to 255 do trie_used[k]:=min_quarterword; trie_op_ptr:=0; @z @x module 950 @t\hskip1em@>@!trie_min:trie_pointer; {all locations |<=trie_min| are vacant in |trie|} tini@;@/ @t\hskip1em@>@!trie_max:trie_pointer; {largest location used in |trie|} @y @t\hskip10pt@>@!trie_min:array[ASCII_code] of trie_pointer; {the first possible slot for each character} @t\hskip10pt@>@!trie_max:trie_pointer; {largest location used in |trie|} @t\hskip10pt@>@!trie_not_ready:boolean; {is the trie still in linked form?} tini @z @x modules 951 and 952 @ Here is how these data structures are initialized. @= procedure init_trie_memory; {gets ready to pack into |trie|} var p:trie_pointer; {index into |trie_ref|, |trie|, |trie_taken|} begin for p:=0 to trie_ptr do trie_ref[p]:=0; trie_max:=256; trie_min:=256; trie_link(0):=1; trie_taken[0]:=false; trie_link(trie_size):=0; trie_back(0):=trie_size; {wrap around} for p:=1 to 256 do begin trie_back(p):=p-1; trie_link(p):=p+1; trie_taken[p]:=false; end; end; @ Each time \.{\\patterns} appears, it overrides any patterns that were entered earlier, so the arrays are not initialized until \TeX\ sees \.{\\patterns}. However, some of the global variables must be initialized when \.{INITEX} is loaded, in case the user never mentions any \.{\\patterns}. @= trie_op_ptr:=min_quarterword;@/ trie_link(0):=0; trie_char(0):=min_quarterword; trie_op(0):=min_quarterword; for k:=1 to 255 do trie[k]:=trie[0]; trie_max:=255; @y @ Each time \.{\\patterns} appears, it contributes further patterns to the future trie, which will be built only when hyphenation is attempted or when a format file is dumped. The boolean variable |trie_not_ready| will change to |false| when the trie is compressed; this will disable further patterns. @= trie_not_ready:=true; trie_root:=0; trie_c[0]:=si(0); trie_ptr:=0; @ Here is how the trie-compression data structures are initialized. If storage is tight, it would be possible to overlap |trie_op_hash|, |trie_op_lang|, and |trie_op_val| with |trie|, |trie_hash|, and |trie_taken|, because we finish with the former just before we need the latter. @= @; for p:=0 to trie_size do trie_hash[p]:=0; trie_root:=compress_trie(trie_root); {identify equivalent subtries} for p:=0 to trie_ptr do trie_ref[p]:=0; for p:=0 to 255 do trie_min[p]:=p+1; trie_link(0):=1; trie_max:=0 @z @x module 953 begin c:=so(trie_c[p]); if c= h.rh:=0; h.b0:=min_quarterword; h.b1:=min_quarterword; {|trie_link:=0|, |trie_op:=min_quarterword|, |trie_char:=qi(0)|} if trie_root=0 then {no patterns were given} begin for r:=0 to 256 do trie[r]:=h; trie_max:=256; end else begin trie_fix(trie_root); {this fixes the non-holes in |trie|} r:=0; {now we will zero out all the holes} repeat s:=trie_link(r); trie[r]:=h; r:=s; until r>trie_max; end; trie_char(0):=qi("?"); {make |trie_char(c)<>c| for all |c|} @z @x module 960 @!r,@!s:trie_pointer; {used to clean up the packed |trie|} @!h:two_halves; {template used to zero out |trie|'s holes} begin scan_left_brace; {a left brace must follow \.{\\patterns}} init_pattern_memory;@/ @; trie_root:=compress_trie(trie_root); {compress the trie} @; end; @y begin if trie_not_ready then begin set_cur_lang; scan_left_brace; {a left brace must follow \.{\\patterns}} @; end else begin print_err("Too late for "); print_esc("patterns"); help1("All patterns must be given before typesetting begins."); error; link(garbage):=scan_toks(false,false); flush_list(def_ref); end; end; @z @x module 963 q:=0; while l= procedure init_trie; var @!p:trie_pointer; {pointer for initialization} @!j,@!k,@!t:integer; {all-purpose registers for initialization} @!r,@!s:trie_pointer; {used to clean up the packed |trie|} @!h:two_halves; {template used to zero out |trie|'s holes} begin @; if trie_root<>0 then begin first_fit(trie_root); trie_pack(trie_root); end; @; trie_not_ready:=false; end; @z @x module 1033 gets new code before main_loop_1 @y if mode>0 then if language<>clang then fix_language; @z @x modules 1091 and 1200 push_nest; mode:=hmode; space_factor:=1000; @y push_nest; mode:=hmode; space_factor:=1000; clang:=0; @z @x module 1324 for k:=0 to trie_max do dump_hh(trie[k]); dump_int(trie_op_ptr); for k:=min_quarterword+1 to trie_op_ptr do begin dump_int(hyf_distance[k]); dump_int(hyf_num[k]); dump_int(hyf_next[k]); end; print_ln; print_int(hyph_count); print(" hyphenation exception"); if hyph_count<>1 then print_char("s"); print_nl("Hyphenation trie of length "); print_int(trie_max); @.Hyphenation trie...@> print(" has "); print_int(qo(trie_op_ptr)); print(" op"); if trie_op_ptr<>min_quarterword+1 then print_char("s") @y print_ln; print_int(hyph_count); print(" hyphenation exception"); if hyph_count<>1 then print_char("s"); if trie_not_ready then init_trie; dump_int(trie_max); for k:=0 to trie_max do dump_hh(trie[k]); dump_int(trie_op_ptr); for k:=1 to trie_op_ptr do begin dump_int(hyf_distance[k]); dump_int(hyf_num[k]); dump_int(hyf_next[k]); end; print_nl("Hyphenation trie of length "); print_int(trie_max); @.Hyphenation trie...@> print(" has "); print_int(trie_op_ptr); print(" op"); if trie_op_ptr<>1 then print_char("s"); print(" out of "); print_int(trie_op_size); for k:=255 downto 0 do if trie_used[k]>min_quarterword then begin print_nl(" "); print_int(qo(trie_used[k])); print(" for language "); print_int(k); dump_int(k); dump_int(qo(trie_used[k])); end @z @x module 1325 undump_size(0)(trie_size)('trie size')(trie_max); for k:=0 to trie_max do undump_hh(trie[k]); undump(min_quarterword)(max_quarterword)(trie_op_ptr); for k:=min_quarterword+1 to trie_op_ptr do begin undump(0)(63)(hyf_distance[k]); {a |small_number|} undump(0)(63)(hyf_num[k]); undump(min_quarterword)(max_quarterword)(hyf_next[k]); end @y undump_size(0)(trie_size)('trie size')(j); {|trie_max|} for k:=0 to j do undump_hh(trie[k]); undump_size(0)(trie_op_size)('trie op size')(j); {|trie_op_ptr|} for k:=1 to j do begin undump(0)(63)(hyf_distance[k]); {a |small_number|} undump(0)(63)(hyf_num[k]); undump(min_quarterword)(max_quarterword)(hyf_next[k]); end; k:=256; while j>0 do begin undump(0)(k-1)(k); undump(1)(j)(x); j:=j-x; op_start[k]:=qo(j); end; @!init trie_not_ready:=false @+tini @z @x module 1341 gets two new definitions @y @d language_node=4 {|subtype| in whatsits that change the current language} @d stored_language(#)==mem[#+1].int {language number, in the range |0..255|} @z @x module 1344 gets a new definition and a new Pascal statement @y @d set_language_code=5 {command modifier for \.{\\setlanguage}} primitive("setlanguage",extension,set_language_code);@/ @!@:set_language_}{\.{\\setlanguage} primitive@> @z @x module 1346 gets a new case @y set_language_code:print_esc("setlanguage"); @z @x module 1348 gets a new case @y set_language_code:@; @z @x module 1356 gets a new case @y language_node:begin print_esc("setlanguage"); print_int(stored_language(p)); end; @z % in modules 1357 and 1358, change "close_node" to "close_node,language_node". @x module 1362 becomes two modules @ @=do_nothing @y @ @= if subtype(cur_p)=language_node then cur_lang:=stored_language(cur_p) @ @= if subtype(s)=language_node then cur_lang:=stored_language(s) @z and old module 1367 is moved to just before the old module 1378 @x module 1373 gets a new case @y language_node:do_nothing; @z @x new modules before the system-dependent changes (i.e. before the old 1376) @y @ @= if abs(mode)<>hmode then report_illegal_case else begin new_whatsit(language_node,small_node_size); scan_int; if cur_val<=0 then clang:=0 else if cur_val>255 then clang:=0 else clang:=cur_val; stored_language(tail):=clang; end @ Finally, we need a subroutine that comes into play when a character of a non-|clang| language is being appended to the current paragraph. @= procedure fix_language; var @!l:ASCII_code; {the new current language} begin if language<=0 then l:=0 else if language>255 then l:=0 else l:=language; if l<>clang then begin new_whatsit(language_node,small_node_size); stored_language(tail):=l; clang:=l; end; end; @z 362. Major extension to ligature capability. @x module 143 a linked list of character nodes for those characters. @y a linked list of character nodes for all original characters that have been deleted. (This list might be empty if the characters that generated the ligature were retained in other nodes.) The |subtype| field is 0, plus 2 and/or 1 if the original source of the ligature included implicit left and/or right boundaries. @z @x in module 144 add the following procedure to the existing code @y function new_lig_item(@!c:quarterword):pointer; var p:pointer; {the new node} begin p:=get_node(small_node_size); character(p):=c; lig_ptr(p):=null; new_lig_item:=p; end; @z @x module 193 font_in_short_display:=font(lig_char(p)); short_display(lig_ptr(p)); print_char(")"); @y if subtype(p)>1 then print_char("|"); font_in_short_display:=font(lig_char(p)); short_display(lig_ptr(p)); if odd(subtype(p)) then print_char("|"); print_char(")"); end @z @x modules 208 and 209 @d radical=65 {square root and similar signs ( \.{\\radical} )} @y @d no_boundary=65 {suppress boundary ligatures ( \.{\\noboundary} )} @d radical=66 {square root and similar signs ( \.{\\radical} )} @z and so on, adding 1 to each definition until getting to max_command=100 @x module 265 gets a new statement @y primitive("noboundary",no_boundary,0);@/ @!@:no_boundary_}{\.{\\noboundary} primitive@> @z @x module 266 gets a new case @y no_boundary:print_esc("noboundary"); @z @x module 545 is entirely replaced @y by the following new specifications: @ The |lig_kern| array contains instructions in a simple programming language that explains what to do for special letter pairs. Each word in this array is a |@!lig_kern_command| of four bytes. \yskip\hang first byte: |skip_byte|, indicates that this is the final program step if the byte is 128 or more, otherwise the next step is obtained by skipping this number of intervening steps.\par \hang second byte: |next_char|, ``if |next_char| follows the current character, then perform the operation and stop, otherwise continue.''\par \hang third byte: |op_byte|, indicates a ligature step if less than~128, a kern step otherwise.\par \hang fourth byte: |remainder|.\par \yskip\noindent In a kern step, an additional space equal to |kern[256*(op_byte-128)+remainder]| is inserted between the current character and |next_char|. This amount is often negative, so that the characters are brought closer together by kerning; but it might be positive. There are eight kinds of ligature steps, having |op_byte| codes $4a+2b+c$ where $0\le a\le b+c$ and $0\le b,c\le1$. The character whose code is |remainder| is inserted between the current character and |next_char|; then the current character is deleted if $b=0$, and |next_char| is deleted if $c=0$; then we pass over $a$~characters to reach the next current character (which may have a ligature/kerning program of its own). If the very first instruction of the |lig_kern| array has |skip_byte=255|, the |next_char| byte is the so-called right boundary character of this font; the value of |next_char| need not lie between |bc| and~|ec|. If the very last instruction of the |lig_kern| array has |skip_byte=255|, there is a special ligature/kerning program for a left boundary character, beginning at location |256*op_byte+remainder|. The interpretation is that \TeX\ puts implicit boundary characters before and after each consecutive string of characters from the same font. These implicit characters do not appear in the output, but they can affect ligatures and kerning. If the very first instruction of a character's |lig_kern| program has |skip_byte>128|, the program actually begins in location |256*op_byte+remainder|. This feature allows access to large |lig_kern| arrays, because the first instruction must otherwise appear in a location |<=255|. Any instruction with |skip_byte>128| in the |lig_kern| array must have |256*op_byte+remainder= @y @d non_char==qi(256) {a |halfword| code that can't match a real character} @d non_address==font_mem_size {a spurious |font_index|} @= @z @x module 548 gets a new type definition @y @!font_index=0..font_mem_size; @z @x module 549 {current \.{\\skewchar} values} @y {current \.{\\skewchar} values} @!bchar_label:array[internal_font_number] of font_index; {start of |lig_kern| program for left boundary character, |non_address| if there is none} @!font_bchar:array[internal_font_number] of min_quarterword..non_char; {right boundary character, |non_char| if there is none} @!font_false_bchar:array[internal_font_number] of min_quarterword..non_char; {|font_bchar| if it doesn't exist in the font, otherwise |non_char|} @z @x module 557 @d char_kern_end(#)==rem_byte(#)].sc @y NOTE: Optimize kern_base_offset in your change file! It's a constant. @d char_kern_end(#)==256*op_byte(#)+rem_byte(#)].sc @d kern_base_offset==256*(kern_flag) @d lig_kern_restart_end(#)==256*op_byte(#)+rem_byte(#)+32768-kern_base_offset @d lig_kern_restart(#)==lig_kern_base[#]+lig_kern_restart_end @z @x module 560 @!z:scaled; {the design size or the ``at'' size} @y @!bch_label:integer; {left boundary start location, or infinity} @!bchar:0..256; {right boundary character, or 256} @!z:scaled; {the design size or the ``at'' size} @z @x module 566 kern_base[f]:=lig_kern_base[f]+nl; exten_base[f]:=kern_base[f]+nk; @y kern_base[f]:=lig_kern_base[f]+nl-kern_base_offset; exten_base[f]:=kern_base[f]+kern_base_offset+nk; @z @x module 573: The entire module is replaced @y by the following code. @ @d check_existence(#)==@t@>@;@/ begin check_byte_range(#); qw:=char_info(f)(#); {N.B.: not |qi(#)|} if not char_exists(qw) then abort; end @= bch_label:=@'77777; bchar:=256; if nl>0 then begin for k:=lig_kern_base[f] to kern_base[f]+kern_base_offset-1 do begin store_four_quarters(font_info[k].qqqq); if a>128 then begin if 256*c+d>=nl then abort; if a=255 then if k=lig_kern_base[f] then bchar:=b; end else begin if b<>bchar then check_existence(b); if c<128 then check_existence(d) {check ligature} else if 256*(c-128)+d>=nk then abort; {check kern} if a<128 then if k-lig_kern_base[f]+a+1>=nl then abort; end; end; if a=255 then bch_label:=256*c+d; end; for k:=kern_base[f]+kern_base_offset to exten_base[f]-1 do store_scaled(font_info[k].sc); @z @x module 574 (actually a bugfix) if a<>0 then check_byte_range(a); if b<>0 then check_byte_range(b); if c<>0 then check_byte_range(c); check_byte_range(d); @y if a<>0 then check_existence(a); if b<>0 then check_existence(b); if c<>0 then check_existence(c); check_existence(d); @z @x module 576 font_name[f]:=nom; @y if bch_label=bc then begin qw:=char_info(f)(bchar); {N.B.: not |qi(bchar)|} if char_exists(qw) then font_false_bchar[f]:=non_char; end; font_name[f]:=nom; @z @x module 708 (slight but optional optimization) continue: if (qo(y)>=font_bc[g])and(qo(y)<=font_ec[g]) then begin q:=char_info(g)(y); @y if (qo(y)>=font_bc[g])and(qo(y)<=font_ec[g]) then begin continue: q:=char_info(g)(y); @z @x module 740 (another bugfix) i:=char_info(f)(y); @y i:=char_info(f)(y); if not char_exists(i) then goto done; @z @x module 741 repeat cur_i:=font_info[a].qqqq; if qo(next_char(cur_i))=skew_char[cur_f] then begin if op_bit(cur_i)>=kern_flag then s:=char_kern(cur_f)(cur_i); goto done1; end; incr(a); until stop_bit(cur_i)>=stop_flag; @y cur_i:=font_info[a].qqqq; if skip_byte(cur_i)>stop_flag then begin a:=256*(qo(op_byte(cur_i)))+rem_byte(cur_i); cur_i:=font_info[a].qqqq; end; loop begin if qo(next_char(cur_i))=skew_char[cur_f] then begin if op_byte(cur_i)>=kern_flag then if skip_byte(cur_i)<=stop_flag then s:=char_kern(cur_f)(cur_i); goto done1; end; if skip_byte(cur_i)>=stop_flag then goto done1 else a:=a+qo(skip_byte(cur_i))+1; cur_i:=font_info[a].qqqq; end; @z @x module 749 (yet another bugfix of the same type!) @!p,@!v,@!x,@!y,@!z:pointer; {temporary registers for box construction} @y @!p,@!v,@!x,@!y,@!z:pointer; {temporary registers for box construction} @!c:quarterword;@+@!i:four_quarters; {registers for character examination} @z @x ibid begin cur_c:=rem_byte(cur_i); character(nucleus(q)):=cur_c; cur_i:=char_info(cur_f)(cur_c); @y begin c:=rem_byte(cur_i); i:=char_info(cur_f)(c); if char_exists(i) then begin cur_c:=c; cur_i:=i; character(nucleus(q)):=c; end; @z @x module 752 @!p:pointer; {temporary register for list manipulation} @y @!p,@!r:pointer; {temporary registers for list manipulation} @z @x ibid repeat cur_i:=font_info[a].qqqq;@/ @; incr(a); until stop_bit(cur_i)>=stop_flag; @y cur_i:=font_info[a].qqqq; if skip_byte(cur_i)>stop_flag then begin a:=lig_kern_restart(cur_f)(cur_i); cur_i:=font_info[a].qqqq; end; loop@+ begin @; if skip_byte(cur_i)>=stop_flag then return; a:=a+qo(skip_byte(cur_i))+1; cur_i:=font_info[a].qqqq; end; @z @x The entire code of module 753 is revised @y and should be replaced by the following: @ Note that a ligature between an |ord_noad| and another kind of noad is replaced by an |ord_noad|, when the two noads collapse into one. But we could make a parenthesis (say) change shape when it follows certain letters. Presumably a font designer will define such ligatures only when this convention makes sense. \chardef\?='174 % vertical line to indicate character retention @= if next_char(cur_i)=cur_c then if skip_byte(cur_i)<=stop_flag then if op_byte(cur_i)>=kern_flag then begin p:=new_kern(char_kern(cur_f)(cur_i)); link(p):=link(q); link(q):=p; return; end else begin check_interrupt; {allow a way out of infinite ligature loop} case op_byte(cur_i) of qi(1),qi(5): character(nucleus(q)):=rem_byte(cur_i); {\.{=:\?}, \.{=:\?>}} qi(2),qi(6): character(nucleus(p)):=rem_byte(cur_i); {\.{\?=:}, \.{\?=:>}} qi(3),qi(7),qi(11):begin r:=new_noad; {\.{\?=:\?}, \.{\?=:\?>}, \.{\?=:\?>>}} character(nucleus(r)):=rem_byte(cur_i); fam(nucleus(r)):=fam(nucleus(q));@/ link(q):=r; link(r):=p; if op_byte(cur_i)qi(3) then return; math_type(nucleus(q)):=math_char; goto restart; end @z @x module 862 @!q,@!r,@!s:pointer; {miscellaneous nodes of temporary interest} @y @!q,@!r,@!s,@!prev_s:pointer; {miscellaneous nodes of temporary interest} @z @x module 892 nodes $p_a$ and~$p_b$ in the description above are placed into variables @y nodes $p_{a-1}$ and~$p_b$ in the description above are placed into variables @z @x ibid @!hc:array[0..65] of halfword; {word to be hyphenated} @y @!hc:array[0..65] of 0..256; {word to be hyphenated} @z @x ibid @!hu:array[1..63] of ASCII_code; {like |hc|, before conversion to lowercase} @y @!hu:array[0..63] of 0..256; {like |hc|, before conversion to lowercase} @z @x module 894 s:=link(cur_p); @y prev_s:=cur_p; s:=link(prev_s); @z @x module 895 label done,found,not_found,found1,exit; @y label common_ending,done,found,found1,not_found,not_found+1,exit; @z @x module 896 else if type(s)=ligature_node then begin q:=lig_ptr(s); c:=qo(character(q)); hf:=font(q); end @y else if type(s)=ligature_node then if lig_ptr(s)=null then goto continue else begin q:=lig_ptr(s); c:=qo(character(q)); hf:=font(q); end @z @x ibid continue: s:=link(s); @y continue: prev_s:=s; s:=link(prev_s); @z @x ibid ha:=s @y ha:=prev_s @z @x module 898 begin j:=hn; q:=lig_ptr(s); if font(q)<>hf then goto done3; repeat c:=qo(character(q)); if lc_code(c)=0 then goto done3; if j=63 then goto done3; incr(j); hu[j]:=c; hc[j]:=lc_code(c);@/ q:=link(q); until q=null; @y begin if font(lig_char(s))<>hf then goto done3; j:=hn; q:=lig_ptr(s); while q>null do begin c:=qo(character(q)); if lc_code(c)=0 then goto done3; if j=63 then goto done3; incr(j); hu[j]:=c; hc[j]:=lc_code(c);@/ q:=link(q); end; @z @x module 900 gets three new global variables @y @!init_list:pointer; {list of punctuation characters preceding the word} @!init_lig:boolean; {does |init_list| represent a ligature?} @!init_lft:boolean; {if so, did the ligature involve a left boundary?} @z @x module 901 @!q,@!r,@!s:pointer; {temporary registers for list manipulation} @y @!p,@!q,@!r,@!s:pointer; {temporary registers for list manipulation} @!bchar:halfword; {right boundary character of hyphenated word, or |non_char|} @z @x module 903 should be entirely replaced @y by the following: @ If hyphens are in fact going to be inserted, \TeX\ first deletes the subsequence of nodes between |ha| and~|hb|. An attempt is made to preserve the effect that implicit boundary characters and punctuation marks had on ligatures inside the hyphenated word, by storing a left boundary or preceding character in |hu[0]| and by storing a possible right boundary in |bchar|. We set |j:=0| if |hu[0]| is to be part of the reconstruction; otherwise |j:=1|. The variable |s| will point to the tail of the current hlist, and |q| will point to the node following |hb|, so that things can be hooked up after we reconstitute the hyphenated word. @= q:=link(hb); link(hb):=null; r:=link(ha); link(ha):=null; bchar:=non_char; if type(hb)=ligature_node then if odd(subtype(hb)) then bchar:=font_bchar[hf]; if is_char_node(ha) then begin init_list:=ha; init_lig:=false; hu[0]:=qo(character(ha)); end else if type(ha)=ligature_node then begin init_list:=lig_ptr(ha); init_lig:=true; init_lft:=(subtype(ha)>1); hu[0]:=qo(character(lig_char(ha))); if init_list=null then if init_lft then begin hu[0]:=256; init_lig:=false; end; {in this case a ligature will be reconstructed from scratch} free_node(ha,small_node_size); end else goto not_found+1; {no punctuation found} s:=cur_p; {we have |cur_p<>ha| because |type(cur_p)=glue_node|} while link(s)<>ha do s:=link(s); j:=0; goto common_ending; not_found+1: j:=1; s:=ha; init_list:=null; if not is_char_node(r) then if type(r)=ligature_node then if subtype(r)>1 then begin j:=0; hu[0]:=256; init_lig:=false; end; common_ending: flush_node_list(r); @; flush_list(init_list) @z @x modules 905--911 are entirely replaced @y by the following new code: Still further complications arise in the presence of ligatures that do not delete the original characters. When punctuation precedes the word being hyphenated, \TeX's method is not perfect under all possible scenarios, because punctuation marks and letters can propagate information back and forth. For example, suppose the original pre-hyphenation pair \.{*a} changes to \.{*y} via a \.{\?=:} ligature, which changes to \.{xy} via a \.{=:\?} ligature; if $p_{a-1}=\.x$ and $p_a=\.y$, the reconstitution procedure isn't smart enough to obtain \.{xy} again. In such cases the font designer should include a ligature that goes from \.{xa} to \.{xy}. @ The processing is facilitated by a subroutine called |reconstitute|. Given a string of characters $x_j\ldots x_n$, there is a smallest index $m\ge j$ such that the ``translation'' of $x_j\ldots x_n$ by ligatures and kerning has the form $y_1\ldots y_t$ followed by the translation of $x_{m+1}\ldots x_n$, where $y_1\ldots y_t$ is some nonempty sequence of character, ligature, and kern nodes. We call $x_j\ldots x_m$ a ``cut prefix'' of $x_j\ldots x_n$. For example, if $x_1x_2x_3=\.{fly}$, and if the font contains `fl' as a ligature and a kern between `fl' and `y', then $m=2$, $y=2$, and $y_1$ will be a ligature node for `fl' followed by an appropriate kern node~$y_2$. In the most common case, $x_j$~forms no ligature with $x_{j+1}$ and we simply have $m=j$, $y_1=x_j$. If $m= @!hyphen_passed:small_number; {first hyphen in a ligature, if any} @ @= function reconstitute(@!j,@!n:small_number;@!bchar,@!hchar:halfword): small_number; label continue,done; var @!p:pointer; {temporary register for list manipulation} @!t:pointer; {a node being appended to} @!q:four_quarters; {character information or a lig/kern instruction} @!cur_rh:halfword; {hyphen character for ligature testing} @!test_char:halfword; {hyphen or other character for ligature testing} @!w:scaled; {amount of kerning} @!k:font_index; {position of current lig/kern instruction} begin hyphen_passed:=0; t:=hold_head; w:=0; link(hold_head):=null; {at this point |ligature_present=lft_hit=rt_hit=false|} @; continue:@; @; reconstitute:=j; end; @ The reconstitution procedure shares many of the global data structures by which \TeX\ has processed the words before they were hyphenated. There is an implied ``cursor'' between characters |cur_l| and |cur_r|; these characters will be tested for possible ligature activity. If |ligature_present| then |cur_l| is a ligature character formed from the original characters following |cur_q| in the current translation list. There is a ``ligature stack'' between the cursor and character |j+1|, consisting of pseudo-ligature nodes linked together by their |link| fields. This stack is normally empty unless a ligature command has created a new character that will need to be processed later. A pseudo-ligature is a special node having a |character| field that represents a potential ligature and a |lig_ptr| field that points to a |char_node| or is |null|. We have $$|cur_r|=\cases{|character(lig_stack)|,&if |lig_stack>null|;\cr |qi(hu[j+1])|,&if |lig_stack=null| and |j= @!cur_l,@!cur_r:halfword; {characters before and after the cursor} @!cur_q:pointer; {where a ligature should be detached} @!lig_stack:pointer; {unfinished business to the right of the cursor} @!ligature_present:boolean; {should a ligature node be made for |cur_l|?} @!lft_hit,@!rt_hit:boolean; {did we hit a ligature with a boundary character?} @ @d append_charnode_to_t(#)== begin link(t):=get_avail; t:=link(t); font(t):=hf; character(t):=#; end @d set_cur_r==begin if j= cur_l:=qi(hu[j]); cur_q:=t; if j=0 then begin ligature_present:=init_lig; p:=init_list; if ligature_present then lft_hit:=init_lft; while p>null do begin append_charnode_to_t(character(p)); p:=link(p); end; end else if cur_l= if cur_l=non_char then begin k:=bchar_label[hf]; if k=non_address then goto done@+else q:=font_info[k].qqqq; end else begin q:=char_info(hf)(cur_l); if char_tag(q)<>lig_tag then goto done; k:=lig_kern_start(hf)(q); q:=font_info[k].qqqq; if skip_byte(q)>stop_flag then begin k:=lig_kern_restart(hf)(q); q:=font_info[k].qqqq; end; end; {now |k| is the starting address of the lig/kern program} if cur_rh; w:=char_kern(hf)(q); goto done; {this kern will be inserted below} end; if skip_byte(q)>=stop_flag then if cur_rh=non_char then goto done else begin cur_rh:=non_char; goto continue; end; k:=k+qo(skip_byte(q))+1; q:=font_info[k].qqqq; end; done: @ @d wrap_lig(#)==if ligature_present then begin p:=new_ligature(hf,cur_l,link(cur_q)); if lft_hit then begin subtype(p):=2; lft_hit:=false; end; if # then if lig_stack=null then begin incr(subtype(p)); rt_hit:=false; end; link(cur_q):=p; t:=p; ligature_present:=false; end @d pop_lig_stack==begin if lig_ptr(lig_stack)>null then begin link(t):=lig_ptr(lig_stack); {this is a charnode for |hu[j+1]|} t:=link(t); incr(j); end; p:=lig_stack; lig_stack:=link(p); free_node(p,small_node_size); if lig_stack=null then set_cur_r@+else cur_r:=character(lig_stack); end {if |lig_stack| isn't |null| we have |cur_rh=non_char|} @= wrap_lig(rt_hit); if w<>0 then begin link(t):=new_kern(w); t:=link(t); w:=0; end; if lig_stack>null then begin cur_q:=t; cur_l:=character(lig_stack); ligature_present:=true; pop_lig_stack; goto continue; end @ @= begin if cur_l=non_char then lft_hit:=true; if j=n then if lig_stack=null then rt_hit:=true; check_interrupt; {allow a way out in case there's an infinite ligature loop} case op_byte(q) of qi(1),qi(5):begin cur_l:=rem_byte(q); {\.{=:\?}, \.{=:\?>}} ligature_present:=true; end; qi(2),qi(6):begin cur_r:=rem_byte(q); {\.{\?=:}. \.{\?=:>}} if lig_stack>null then character(lig_stack):=cur_r else begin lig_stack:=new_lig_item(cur_r); if j=n then bchar:=non_char else begin p:=get_avail; lig_ptr(lig_stack):=p; character(p):=qi(hu[j+1]); font(p):=hf; end; end; end; qi(3):begin cur_r:=rem_byte(q); {\.{\?=:\?}} p:=lig_stack; lig_stack:=new_lig_item(cur_r); link(lig_stack):=p; end; qi(7),qi(11):begin wrap_lig(false); {\.{\?=:\?>}, \.{\?=:\?>>}} cur_q:=t; cur_l:=rem_byte(q); ligature_present:=true; end; othercases begin cur_l:=rem_byte(q); ligature_present:=true; {\.{=:}} if lig_stack>null then pop_lig_stack else if j=n then goto done else begin append_charnode_to_t(cur_r); incr(j); set_cur_r; end; end endcases; if op_byte(q)>qi(4) then if op_byte(q)<>qi(7) then goto done; goto continue; end @z @x module 912 @!c:ASCII_code; {character temporarily replaced by a hyphen} @y @!c:ASCII_code; {character temporarily replaced by a hyphen} @!c_loc:0..63; {where that character came from} @!r_count:integer; {replacement count for discretionary} @z @x modules 913--918 are to be completely replaced @y by the following code: @ When the following code is performed, |hyf[0]| and |hyf[hn]| will be zero. @= repeat l:=j; j:=reconstitute(j,hn,bchar,qi(hyf_char))+1; if hyphen_passed=0 then begin link(s):=link(hold_head); while link(s)>null do s:=link(s); if odd(hyf[j-1]) then begin l:=j; hyphen_passed:=j-1; link(hold_head):=null; end; end; if hyphen_passed>0 then @; until j>hn; link(s):=q @ @d advance_major_tail==begin major_tail:=link(major_tail); incr(r_count); end @= begin r:=get_node(small_node_size); link(r):=link(hold_head); type(r):=disc_node; major_tail:=r; r_count:=0; while link(major_tail)>null do advance_major_tail; i:=hyphen_passed; @; @; @; end @ The new hyphen might combine with the previous character via ligature or kern. At this point we have |l-1<=i<=j| and |i= minor_tail:=null; pre_break(r):=null; hyf_node:=new_character(hf,hyf_char); if hyf_node<>null then begin incr(i); c:=hu[i]; hu[i]:=hyf_char; free_avail(hyf_node); end; while l<=i do begin l:=reconstitute(l,i,font_bchar[hf],non_char)+1; if link(hold_head)>null then begin if minor_tail=null then pre_break(r):=link(hold_head) else link(minor_tail):=link(hold_head); minor_tail:=link(hold_head); while link(minor_tail)>null do minor_tail:=link(minor_tail); end; end; if hyf_node<>null then begin hu[i]:=c; {restore the character in the hyphen position} l:=i; decr(i); end @ The synchronization algorithm begins with |l=i+1<=j|. @= minor_tail:=null; post_break(r):=null; c_loc:=0; if bchar_label[hf]0 then begin hu[c_loc]:=c; c_loc:=0; end; if link(hold_head)>null then begin if minor_tail=null then post_break(r):=link(hold_head) else link(minor_tail):=link(hold_head); minor_tail:=link(hold_head); while link(minor_tail)>null do minor_tail:=link(minor_tail); end; until l>=j; while l>j do @; end @ @= begin j:=reconstitute(j,hn,bchar,non_char)+1; link(major_tail):=link(hold_head); while link(major_tail)>null do advance_major_tail; end @ Ligature insertion can cause a word to grow exponentially in size. Therefore we must test the size of |r_count| here, even though the hyphenated text was at most 63 characters long. @= if r_count>127 then {we have to forget the discretionary hyphen} begin link(s):=link(r); link(r):=null; flush_node_list(r); end else begin link(s):=r; replace_count(r):=r_count; end; s:=major_tail @z @x module 1030 @d main_loop=70 {go here to typeset |cur_chr| in the current font} @d main_loop_1=71 {like |main_loop|, but |(f,c)| = current font and char} @d main_loop_2=72 {like |main_loop_1|, but |c| is known to be in range} @d main_loop_3=73 {like |main_loop_2|, but several variables are set up} @d append_normal_space=74 {go here to append a normal space between words} @y @d main_loop=70 {go here to typeset a string of consecutive characters} @d main_loop_wrapup=80 {go here to finish a character or ligature} @d main_loop_move=90 {go here to advance the ligature cursor} @d main_loop_move_lig=95 {same, when advancing past a generated ligature} @d main_loop_lookahead=100 {go here to bring in another character, if any} @d main_lig_loop=110 {go here to check for ligatures or kerning} @d append_normal_space=120 {go here to append a normal space between words} @z @x ibid label big_switch,reswitch,main_loop,main_loop_1,main_loop_2,main_loop_3, @y label big_switch,reswitch,main_loop,main_loop_wrapup, main_loop_move,main_loop_move+1,main_loop_move+2,main_loop_move_lig, main_loop_lookahead,main_loop_lookahead+1, main_lig_loop,main_lig_loop+1,main_lig_loop+2, @z @x ibid @@; @y @z @x ibid hmode+char_num: begin scan_char_num; cur_chr:=cur_val; goto main_loop; end; @y hmode+char_num: begin scan_char_num; cur_chr:=cur_val; goto main_loop;@+end; hmode+no_boundary: begin get_x_token; if (cur_cmd=letter)or(cur_cmd=other_char)or(cur_cmd=char_given)or (cur_cmd=char_num) then cancel_boundary:=true; goto reswitch; end; @z @x modules 1032--1040 are all to be replaced @y by the following code: @ The following part of the program was first written in a structured manner, according to the philosophy that ``premature optimization is the root of all evil.'' Then it was rearranged into pieces of spaghetti so that the most common actions could proceed with little or no redundancy. The original unoptimized form of this algorithm resembles the |reconstitute| procedure, which was described earlier in connection with hyphenation. Again we have an implied ``cursor`` between characters |cur_l| and |cur_r|. The main difference is that the |lig_stack| can now contain a charnode as well as pseudo-ligatures; that stack is now usually nonempty, because the next character of input (if any) has been appended to it. In |main_control| we have $$|cur_r|=\cases{|character(lig_stack)|,&if |lig_stack>null|;\cr |font_bchar[cur_font]|,&otherwise.\cr}$$ Several additional global variables are needed. @= @!main_f:internal_font_number; {the current font} @!main_i:four_quarters; {character information bytes for |cur_l|} @!main_j:four_quarters; {ligature/kern command} @!main_k:font_index; {index into |font_info|} @!main_p:pointer; {temporary register for list manipulation} @!main_s:integer; {space factor value} @!bchar:halfword; {right boundary character of current font, or |non_char|} @!false_bchar:halfword; {nonexistent character matching |bchar|, or |non_char|} @!cancel_boundary:boolean; {should the left boundary be ignored?} @!ins_disc:boolean; {should we insert a discretionary node?} @ The boolean variables of the main loop are normally false, and always reset to false before the loop is left. That saves us the extra work of initializing each time. @= ligature_present:=false; cancel_boundary:=false; lft_hit:=false; rt_hit:=false; ins_disc:=false; @ We leave |space_factor| unchanged if |sf_code(cur_chr)=0|; otherwise we set it to |sf_code(cur_chr)|, except that the space factor never changes from a value less than 1000 to a value exceeding 1000. The most common case is |sf_code(cur_chr)=1000|, so we want that case to be fast. The overall structure of the main loop is presented here. Some program labels are inside the individual sections. @d adjust_space_factor==@t@>@;@/ main_s:=sf_code(cur_chr); if main_s=1000 then space_factor:=1000 else if main_s<1000 then begin if main_s>0 then space_factor:=main_s; end else if space_factor<1000 then space_factor:=1000 else space_factor:=main_s @= adjust_space_factor;@/ main_f:=cur_font; bchar:=font_bchar[main_f]; false_bchar:=font_false_bchar[main_f]; if mode>0 then if language<>clang then fix_language; fast_get_avail(lig_stack); font(lig_stack):=main_f; cur_l:=qi(cur_chr); character(lig_stack):=cur_l;@/ cur_q:=tail; if cancel_boundary then begin cancel_boundary:=false; main_k:=non_address; end else main_k:=bchar_label[main_f]; if main_k=non_address then goto main_loop_move+2; {no left boundary processing} cur_r:=cur_l; cur_l:=non_char; goto main_lig_loop+1; {begin with cursor after left boundary} @# main_loop_wrapup:@; main_loop_move:@; main_loop_lookahead:@; main_lig_loop:@; main_loop_move_lig:@ @ If the current horizontal list is empty, the reference to |character(tail)| here is not strictly legal, since |tail| will be a node freshly returned by |get_avail|. But this should cause no problem on most implementations, and we do want the inner loop to be fast. @^dirty Pascal@> A discretionary break is not inserted for an explicit hyphen when we are in restricted horizontal mode. In particular, this avoids putting discretionary nodes inside of other discretionaries. @d pack_lig(#)== {the parameter is either |rt_hit| or |false|} begin main_p:=new_ligature(main_f,cur_l,link(cur_q)); if lft_hit then begin subtype(main_p):=2; lft_hit:=false; end; if # then if lig_stack=null then begin incr(subtype(main_p)); rt_hit:=false; end; link(cur_q):=main_p; tail:=main_p; ligature_present:=false; end @d wrapup(#)==if cur_lnull then ins_disc:=true; if ligature_present then pack_lig(#); if ins_disc then begin ins_disc:=false; if mode>0 then tail_append(new_disc); end; end @= wrapup(rt_hit) @ @= if lig_stack=null then goto reswitch; cur_q:=tail; cur_l:=cur_r; {or |character(lig_stack)|} main_loop_move+1:if not is_char_node(lig_stack) then goto main_loop_move_lig; main_loop_move+2:if(cur_chrfont_ec[main_f]) then begin char_warning(main_f,cur_chr); free_avail(lig_stack); goto big_switch; end; main_i:=char_info(main_f)(cur_l); if not char_exists(main_i) then begin char_warning(main_f,cur_chr); free_avail(lig_stack); goto big_switch; end; tail_append(lig_stack) {|main_loop_lookahead| is next} @ Here we are at |main_loop_move_lig|. When we begin this code we have |cur_l=character(lig_stack)| and |cur_q=tail|. @= main_p:=lig_ptr(lig_stack); if main_p>null then tail_append(main_p); temp_ptr:=lig_stack; lig_stack:=link(temp_ptr); free_node(temp_ptr,small_node_size); main_i:=char_info(main_f)(cur_l); ligature_present:=true; if lig_stack=null then if main_p>null then goto main_loop_lookahead else cur_r:=bchar else cur_r:=character(lig_stack); goto main_lig_loop @ The result of \.{\\char} can participate in a ligature or kern, so we must look ahead for it. @= get_next; {set only |cur_cmd| and |cur_chr|, for speed} if cur_cmd=letter then goto main_loop_lookahead+1; if cur_cmd=other_char then goto main_loop_lookahead+1; if cur_cmd=char_given then goto main_loop_lookahead+1; x_token; {now expand and set |cur_cmd|, |cur_chr|, |cur_tok|} if cur_cmd=letter then goto main_loop_lookahead+1; if cur_cmd=other_char then goto main_loop_lookahead+1; if cur_cmd=char_given then goto main_loop_lookahead+1; if cur_cmd=char_num then begin scan_char_num; cur_chr:=cur_val; goto main_loop_lookahead+1; end; if cur_cmd=no_boundary then bchar:=non_char; cur_r:=bchar; lig_stack:=null; goto main_lig_loop; main_loop_lookahead+1: adjust_space_factor; fast_get_avail(lig_stack); font(lig_stack):=main_f; cur_r:=qi(cur_chr); character(lig_stack):=cur_r; if cur_r=false_bchar then cur_r:=non_char {this prevents spurious ligatures} @ Even though comparatively few characters have a lig/kern program, several of the instructions here count as part of \TeX's inner loop, since a potentially long sequential search must be performed. For example, tests with Computer Modern Roman showed that about 40 per cent of all characters actually encountered in practice had a lig/kern program, and that about four lig/kern commands were investigated for every such character. At the beginning of this code we have |main_i=char_info(main_f)(cur_l)|. @= if char_tag(main_i)<>lig_tag then goto main_loop_wrapup; main_k:=lig_kern_start(main_f)(main_i); main_j:=font_info[main_k].qqqq; if skip_byte(main_j)<=stop_flag then goto main_lig_loop+2; main_k:=lig_kern_restart(main_f)(main_j); main_lig_loop+1:main_j:=font_info[main_k].qqqq; main_lig_loop+2:if next_char(main_j)=cur_r then if skip_byte(main_j)<=stop_flag then @; if skip_byte(main_j)=qi(0) then incr(main_k) else begin if skip_byte(main_j)>=stop_flag then goto main_loop_wrapup; main_k:=main_k+qo(skip_byte(main_j))+1; end; goto main_lig_loop+1 @ When a ligature or kern instruction matches a character, we know from |read_font_info| that the character exists in the font, even though we haven't verified its existence in the normal way. This section could be made into a subroutine, if the code inside |main_control| needs to be shortened. \chardef\?='174 % vertical line to indicate character retention @= begin if op_byte(main_j)>=kern_flag then begin wrapup(rt_hit); tail_append(new_kern(char_kern(main_f)(main_j))); goto main_loop_move; end; if cur_l=non_char then lft_hit:=true else if lig_stack=null then rt_hit:=true; check_interrupt; {allow a way out in case there's an infinite ligature loop} case op_byte(main_j) of qi(1),qi(5):begin cur_l:=rem_byte(main_j); {\.{=:\?}, \.{=:\?>}} main_i:=char_info(main_f)(cur_l); ligature_present:=true; end; qi(2),qi(6):begin cur_r:=rem_byte(main_j); {\.{\?=:}, \.{\?=:>}} if lig_stack=null then {right boundary character is being consumed} begin lig_stack:=new_lig_item(cur_r); bchar:=non_char; end else if is_char_node(lig_stack) then {|link(lig_stack)=null|} begin main_p:=lig_stack; lig_stack:=new_lig_item(cur_r); lig_ptr(lig_stack):=main_p; end else character(lig_stack):=cur_r; end; qi(3):begin cur_r:=rem_byte(main_j); {\.{\?=:\?}} main_p:=lig_stack; lig_stack:=new_lig_item(cur_r); link(lig_stack):=main_p; end; qi(7),qi(11):begin wrapup(false); {\.{\?=:\?>}, \.{\?=:\?>>}} cur_q:=tail; cur_l:=rem_byte(main_j); main_i:=char_info(main_f)(cur_l); ligature_present:=true; end; othercases begin cur_l:=rem_byte(main_j); ligature_present:=true; {\.{=:}} if lig_stack=null then goto main_loop_wrapup else goto main_loop_move+1; end endcases; if op_byte(main_j)>qi(4) then if op_byte(main_j)<>qi(7) then goto main_loop_wrapup; if cur_l a function that returns one of % four values; you goto a label based on the value returned. @x module 1042 begin p:=font_glue[cur_font]; if p=null then begin f:=cur_font; p:=new_spec(zero_glue); k:=param_base[f]+space_code; width(p):=font_info[k].sc; {that's |space(f)|} stretch(p):=font_info[k+1].sc; {and |space_stretch(f)|} shrink(p):=font_info[k+2].sc; {and |space_shrink(f)|} font_glue[f]:=p; @y begin main_p:=font_glue[cur_font]; if main_p=null then begin main_p:=new_spec(zero_glue); main_k:=param_base[cur_font]+space_code; width(main_p):=font_info[main_k].sc; {that's |space(cur_font)|} stretch(main_p):=font_info[main_k+1].sc; {and |space_stretch(cur_font)|} shrink(main_p):=font_info[main_k+2].sc; {and |space_shrink(cur_font)|} font_glue[cur_font]:=main_p; @z @x module 1045 any_mode(relax),vmode+spacer,mmode+spacer,mmode+no_boundary:do_nothing; @y any_mode(relax),vmode+spacer,mmode+spacer:do_nothing; @z @x module 1090 vmode+ex_space:@t@>@;@/ @y vmode+ex_space,vmode+no_boundary:@t@>@;@/ @z @x module 1322 dump_int(font_glue[k]);@/ @y dump_int(font_glue[k]);@/ dump_int(bchar_label[k]); dump_int(font_bchar[k]); dump_int(font_false_bchar[k]);@/ @z @x module 1323 undump(min_halfword)(lo_mem_max)(font_glue[k]);@/ @y undump(min_halfword)(lo_mem_max)(font_glue[k]);@/ undump(0)(font_mem_size)(bchar_label[k]); undump(min_quarterword)(non_char)(font_bchar[k]); undump(min_quarterword)(non_char)(font_false_bchar[k]); @z 363. New \inputlineno feature desired by Spivak @x module 416 gets a new definition and a new statement @y @d input_line_no_code=glue_val+1 {code for \.{\\inputlineno}} primitive("inputlineno",last_item,input_line_no_code); @!@:input_line_no_}{\.{\\inputlineno} primitive@> @z and module 417 changes in the obvious way @x module 424 gets new code at the beginning @y if cur_chr>glue_val then begin cur_val:=line; cur_val_level:=int_val; end else @z 364. New feature \holdinginserts suggested by Mittelbach. @x modules 236--238 get a new integer parameter @d int_pars=53 {total number of integer parameters} @y @d holding_inserts_code=53 {do not remove insertion nodes from \.{\\box255}} @d int_pars=54 {total number of integer parameters} @z and appropriate further lines are added to match all the other parameters @x module 1014 @; q:=hold_head; link(q):=null; prev_p:=page_head; p:=link(prev_p); while p<>best_page_break do begin if type(p)=ins_node then @ @y if holding_inserts<=0 then @; q:=hold_head; link(q):=null; prev_p:=page_head; p:=link(prev_p); while p<>best_page_break do begin if type(p)=ins_node then begin if holding_inserts<=0 then @; end @z % also insert begin...end around the Pascal code of module 1018 365. New \badness feature (which I'd been resisting for years) @x module 416 gets a new definition and a new statement @y @d badness_code=glue_val+2 {code for \.{\\badness}} primitive("badness",last_item,badness_code); @!@:badness_}{\.{\\badness} primitive@> @z and module 417 changes in the obvious way @x module 424 (the new code just added in #363) begin cur_val:=line; cur_val_level:=int_val; @y begin if cur_chr=input_line_no_code then cur_val:=line else cur_val:=last_badness; {|cur_chr=badness_code|} cur_val_level:=int_val; @z @x module 646 gets a new global variable @y @!last_badness:integer; {badness of the most recently packaged box} @z @x module 648 @ @=adjust_tail:=null; @y @ @=adjust_tail:=null; last_badness:=0; @z @x modules 649 and 668 @!b:integer; {badness of the new box} begin r:=get_node(box_node_size); type(r):=hlist_node; @y (except it's vlist_node in 668) begin last_badness:=0; r:=get_node(box_node_size); type(r):=hlist_node; @z (except it's vlist_node in 668) % change b to last_badness in modules 660&674 (4 times), 667&678 (3 times) @x modules 658 and 673 if (hbadnessnull) then @y (except it's vbadness in 673) if o=normal then if list_ptr(r)<>null then @z @x modules 664 and 676 begin set_glue_ratio_one(glue_set(r)); {this is the maximum shrinkage} @y begin last_badness:=1000000; set_glue_ratio_one(glue_set(r)); {use the maximum shrinkage} @z @x ibid else if (hbadness<100)and(o=normal)and(list_ptr(r)<>null) then @y (except it's vbadness in 676) else if o=normal then if list_ptr(r)<>null then @z 366. New \emergencystretch feature @x modules 247--248 get a new dimen parameter @d dimen_pars=20 {total number of dimension parameters} @y @d emergency_stretch_code=20 {reduces badnesses on final pass of line-breaking} @d dimen_pars=21 {total number of dimension parameters} @z and appropriate further lines are added to match all the other parameters @x module 828 @!second_pass:boolean; {is this our second attempt to break this paragraph?} @y @!second_pass:boolean; {is this our second attempt to break this paragraph?} @!final_pass:boolean; {is this our final attempt to break this paragraph?} @z % change second_pass to final_pass in modules 854 and 873 @x module 863 second_pass:=false; end else begin threshold:=tolerance; second_pass:=true; @y second_pass:=false; final_pass:=false; end else begin threshold:=tolerance; second_pass:=true; final_pass:=(emergency_stretch<=0); @z @x ibid @!stat if tracing_paragraphs>0 then print_nl("@@secondpass");@;@+tats@/ threshold:=tolerance; second_pass:=true; {if at first you don't succeed, \dots} @y if not second_pass then begin@!stat if tracing_paragraphs>0 then print_nl("@@secondpass");@;@+tats@/ threshold:=tolerance; second_pass:=true; final_pass:=(emergency_stretch<=0); end {if at first you don't succeed, \dots} else begin @!stat if tracing_paragraphs>0 then print_nl("@@finalpass");@;@+tats@/ background[2]:=background[2]+emergency_stretch; final_pass:=true; end; @z 367. New \errorcontextlines feature suggested by a TUG participant @x modules 236--238 get a new integer parameter @d int_pars=54 {total number of integer parameters} @y @d error_context_lines_code=54 {maximum intermediate line pairs shown} @d int_pars=55 {total number of integer parameters} @z and appropriate further lines are added to match all the other parameters @x module 311 @@/ begin base_ptr:=input_ptr; input_stack[base_ptr]:=cur_input; {store current state} loop@+begin cur_input:=input_stack[base_ptr]; {enter into the context} @; if (state<>token_list) then if (name>17) or (base_ptr=0) then goto done; @y @!nn:integer; {number of contexts shown so far, less one} @!bottom_line:boolean; {have we reached the final context to be shown?} @@/ begin base_ptr:=input_ptr; input_stack[base_ptr]:=cur_input; {store current state} nn:=-1; bottom_line:=false; loop@+begin cur_input:=input_stack[base_ptr]; {enter into the context} if (state<>token_list) then if (name>17) or (base_ptr=0) then bottom_line:=true; if (base_ptr=input_ptr)or bottom_line or(nn else if nn=error_context_lines then begin print_nl("..."); incr(nn); {omitted if |error_context_lines<0|} end; if bottom_line then goto done; @z % also insert begin...end around the Pascal code of module 312 % and add the statement "incr(nn)" to that module 368. char_warning inside hyphenation could clobber old_setting @x module 863 done: @!stat if tracing_paragraphs>0 then end_diagnostic(true);@;@+tats@/ @y done: @!stat if tracing_paragraphs>0 then begin end_diagnostic(true); normalize_selector; end;@+tats@/ @z 369. Make ".fmt" more easily switchable (Don Hosek). @x module 520 gets a new definition @y @d format_extension=".fmt" {the extension, as a \.{WEB} constant} @z now replace ".fmt" by format_extension in modules 529 and 1328. 370. Possible range check on weird nullfont (Breitenlohner, 16 Oct 89). @x module 565 if (bc>ec+1)or(ec>255) then abort; @y if (bc>ec+1)or(ec>255) then abort; if bc>255 then {|bc=256| and |ec=255|} begin bc:=1; ec:=0; end; @z 371. Prevent save_stack conflicts, e.g. in {\hbox\expandafter{\csname \endcsname}} (found by Sullivan). @x module 645 @p procedure scan_spec; {scans a box specification and left brace} label found; begin if scan_keyword("to") then saved(0):=exactly @.to@> else if scan_keyword("spread") then saved(0):=additional @.spread@> else begin saved(0):=additional; saved(1):=0; goto found; end; scan_normal_dimen; saved(1):=cur_val; found: save_ptr:=save_ptr+2; scan_left_brace; @y @p procedure scan_spec(@!c:group_code;@!three_codes:boolean); {scans a box specification and left brace} label found; var @!s:integer; {temporarily saved value} @!spec_code:exactly..additional; begin if three_codes then s:=saved(0); if scan_keyword("to") then spec_code:=exactly @.to@> else if scan_keyword("spread") then spec_code:=additional @.spread@> else begin spec_code:=additional; cur_val:=0; goto found; end; scan_normal_dimen; found: if three_codes then begin saved(0):=s; incr(save_ptr); end; saved(0):=spec_code; saved(1):=cur_val; save_ptr:=save_ptr+2; new_save_level(c); scan_left_brace; @z @x module 774 scan_spec; new_save_level(align_group);@/ @y scan_spec(align_group,false);@/ @z @x module 1073 if t=0 then saved(0):=cur_val@+else saved(0):=-cur_val; scan_box; end; any_mode(leader_ship): begin saved(0):=leader_flag-a_leaders+cur_chr; scan_box; end; any_mode(make_box): begin saved(0):=0; begin_box; end; @y if t=0 then scan_box(cur_val)@+else scan_box(-cur_val); end; any_mode(leader_ship): scan_box(leader_flag-a_leaders+cur_chr); any_mode(make_box): begin_box(0); @z @x module 1075 procedure box_end; var p:pointer; {|ord_noad| for new box in math mode} begin if saved(0) else if saved(0) else if cur_box<>null then if saved(0)>ship_out_flag then @ @y procedure box_end(@!box_context:integer); var p:pointer; {|ord_noad| for new box in math mode} begin if box_context else if box_context else if cur_box<>null then if box_context>ship_out_flag then @ @z @x module 1076 begin shift_amount(cur_box):=saved(0); @y begin shift_amount(cur_box):=box_context; @z @x module 1077 if saved(0); if cur_cmd=make_box then begin_box else if (saved(0)>=leader_flag)and((cur_cmd=hrule)or(cur_cmd=vrule)) then begin cur_box:=scan_rule_spec; box_end; @y procedure scan_box(@!box_context:integer); {the next input should specify a box or perhaps a rule} begin @; if cur_cmd=make_box then begin_box(box_context) else if (box_context>=leader_flag)and((cur_cmd=hrule)or(cur_cmd=vrule)) then begin cur_box:=scan_rule_spec; box_end(box_context); @z @x module 1086 pop_nest; box_end; @y pop_nest; box_end(saved(0)); @z @x module 1117 else begin incr(save_ptr); saved(-1):=0; scan_left_brace; new_save_level(disc_group); push_nest; mode:=-hmode; space_factor:=1000; @y else begin incr(save_ptr); saved(-1):=0; new_save_level(disc_group); scan_left_brace; push_nest; mode:=-hmode; space_factor:=1000; @z @x module 1119 incr(saved(-1)); scan_left_brace; new_save_level(disc_group); @y incr(saved(-1)); new_save_level(disc_group); scan_left_brace; @z @x module 1167 mmode+vcenter: begin scan_spec; new_save_level(vcenter_group); normal_paragraph; @y mmode+vcenter: begin scan_spec(vcenter_group,false); normal_paragraph; @z @x module 1172 scan_left_brace; push_math(math_choice_group); @y push_math(math_choice_group); scan_left_brace; @z @x module 1174 incr(saved(-1)); scan_left_brace; push_math(math_choice_group); @y incr(saved(-1)); push_math(math_choice_group); scan_left_brace; @z @x module 1241 if global then saved(0):=box_flag+256+cur_val else saved(0):=box_flag+cur_val; scan_optional_equals; scan_box; @y if global then n:=256+cur_val@+else n:=cur_val; scan_optional_equals; scan_box(box_flag+n); @z 372. Bugfix 339 didn't go far enough (found by Sch\"opf and Mittelbach). @x module 516 [NOTE: THIS AFFECTS ALMOST ALL CHANGE FILES!] @ And here's the second. @^system dependencies@> @p function more_name(@!c:ASCII_code):boolean; begin if c=" " then more_name:=false else begin if (c=">")or(c=":") then begin area_delimiter:=pool_ptr; ext_delimiter:=0; end else if (c=".")and(ext_delimiter=0) then ext_delimiter:=pool_ptr; str_room(1); append_char(c); {contribute |c| to the current string} @y @ And here's the second. The string pool might change as the file name is being scanned, since a new \.{\\csname} might be entered; therefore we keep |area_delimiter| and |ext_delimiter| relative to the beginning of the current string, instead of assigning an absolute address like |pool_ptr| to them. @^system dependencies@> @p function more_name(@!c:ASCII_code):boolean; begin if c=" " then more_name:=false else begin str_room(1); append_char(c); {contribute |c| to the current string} if (c=">")or(c=":") then begin area_delimiter:=cur_length; ext_delimiter:=0; end else if (c=".")and(ext_delimiter=0) then ext_delimiter:=cur_length; @z @x module 517 [NOTE: THIS DOES TOO, AND SO DOES THE NEXT!] else begin cur_area:=str_ptr; incr(str_ptr); str_start[str_ptr]:=area_delimiter+1; @y else begin cur_area:=str_ptr; str_start[str_ptr+1]:=str_start[str_ptr]+area_delimiter; incr(str_ptr); @z @x ibid else begin cur_name:=str_ptr; incr(str_ptr); str_start[str_ptr]:=ext_delimiter; cur_ext:=make_string; @y else begin cur_name:=str_ptr; str_start[str_ptr+1]:=str_start[str_ptr]+ext_delimiter-area_delimiter-1; incr(str_ptr); cur_ext:=make_string; @z 373. Allow multiple hyphenmins in the same paragraph (Mike Ferguson). @x module 212, two new fields for list_state_record @y @!lhm_field,@!rhm_field: quarterword; @z @x module 213, two new macros to access those fields @y @d lhmin==cur_list.lhm_field {\.{\\lefthyphenmin} at start of paragraph} @d rhmin==cur_list.rhm_field {\.{\\righthyphenmin} at start of paragraph} @z @x module 215, two new initializations @y lhmin:=0; rhmin:=0; @z @x module 218 if nest[p].ml_field<0 then print(" (\output routine)"); @y if m=hmode then@+if(nest[p].lhm_field<>2)or(nest[p].rhm_field<>3)then begin print(" (hyphenmin "); print_int(nest[p].lhm_field); print_char(","); print_int(nest[p].rhm_field); print_char(")"); end; if nest[p].ml_field<0 then print(" (\output routine)"); @z @x module 891 l_hyf:=left_hyphen_min-1;@+if l_hyf<0 then l_hyf:=0; r_hyf:=right_hyphen_min-1;@+if r_hyf<0 then r_hyf:=0; min_hyf:=l_hyf+r_hyf+2; cur_lang:=0; @y l_hyf:=lhmin; r_hyf:=rhmin; cur_lang:=0; @z @x module 892 @!l_hyf,@!r_hyf,@!min_hyf:integer; {limits on fragment sizes} @y @!l_hyf,@!r_hyf:integer; {limits on fragment sizes} @z @x module 894 begin if min_hyf>63 then goto done1; prev_s:=cur_p; s:=link(prev_s); if s<>null then begin @; @; @; @y begin prev_s:=cur_p; s:=link(prev_s); if s<>null then begin @; if l_hyf+r_hyf>63 then goto done1; @; @; @z @x module 899 if hn=63 then norm_min:=63@+ else norm_min:=h; end; @z @x module 1091 then uses the new subroutine push_nest; mode:=hmode; space_factor:=1000; clang:=0; @y lhmin:=norm_min(left_hyphen_min); rhmin:=norm_min(right_hyphen_min); push_nest; mode:=hmode; space_factor:=1000; clang:=0; @z @x module 1341 @d stored_language(#)==mem[#+1].int {language number, in the range |0..255|} @y @d what_lang(#)==link(#+1) {language number, in the range |0..255|} @d what_lhm(#)==type(#+1) {minimum left fragment, in the range |1..63|} @d what_rhm(#)==subtype(#+1) {minimum right fragment, in the range |1..63|} @z @x module 1356 print_int(stored_language(p)); @y print_int(what_lang(p)); print(" (hyphenmin "); print_int(what_lhm(p)); print_char(","); print_int(what_rhm(p)); print_char(")"); @z @x modules 1362 and 1363 @ @= if subtype(cur_p)=language_node then cur_lang:=stored_language(cur_p) @ @= if subtype(s)=language_node then cur_lang:=stored_language(s) @y @ @d adv_past(#)==@+if subtype(#)=language_node then begin cur_lang:=what_lang(#); l_hyf:=what_lhm(#); r_hyf:=what_rhm(#);@+end @=@+ adv_past(cur_p) @ @=@+ adv_past(s) @z @x module 1376 stored_language(tail):=l; clang:=l; @y what_lang(tail):=l; clang:=l;@/ what_lhm(tail):=norm_min(left_hyphen_min); what_rhm(tail):=norm_min(right_hyphen_min); @z @x module 1377 stored_language(tail):=clang; @y what_lang(tail):=clang; what_lhm(tail):=norm_min(left_hyphen_min); what_rhm(tail):=norm_min(right_hyphen_min); @z 374. Make \par and end_template definitely non-character (Marc van Leeuwen) @x module 14 gets a new line @y if mem_top<256+11 then bad:=7; {we will want |null_list>255|} @z @x module 334 primitive("par",par_end,0); par_loc:=cur_val; par_token:=cs_token_flag+par_loc; @y primitive("par",par_end,256); {cf. |scan_file_name|} par_loc:=cur_val; par_token:=cs_token_flag+par_loc; @z 375. Alignments must be more robust to prevent crashes (Marc van Leeuwen) @x module 324 else if token_type=u_template then align_state:=0; @y else if token_type=u_template then if align_state>500000 then align_state:=0 else fatal_error("(interwoven alignment preambles are not allowed)"); @.interwoven alignment preambles...@> @z @x module 782 if (cur_cmd=assign_glue)and(cur_chr=glue_base+tab_skip_code) then @y if cur_cmd=endv then fatal_error("(interwoven alignment preambles are not allowed)"); @.interwoven alignment preambles...@> if (cur_cmd=assign_glue)and(cur_chr=glue_base+tab_skip_code) then @z @x module 791 p:=link(q); @y if align_state<500000 then fatal_error("(interwoven alignment preambles are not allowed)"); @.interwoven alignment preambles...@> p:=link(q); @z 376. Avoid kern removal in discretionary breaks (Marc van Leeuwen) @x module 815 label done,done1,done2,done3,done4,continue; @y label done,done1,done2,done3,done4,done5,continue; @z @x module 866 glue_node: begin @; @; @y glue_node: begin @; @z @x ibid disc_node: @; @y disc_node: @; @z @x ibid end @y done5:end @z Combine modules 868 and 869 into a single module, with a semicolon between. @x module 870 (which becomes module 869) gets ... in its title @y and the following new code just before its final "end": r:=replace_count(cur_p); s:=link(cur_p); while r>0 do begin @; decr(r); s:=link(s); end; prev_p:=cur_p; cur_p:=s; goto done5; @z @x Now module 871 becomes 870, and we add a new (very similar) module 871: @y @ @= if is_char_node(s) then begin f:=font(s); act_width:=act_width+char_width(f)(char_info(f)(character(s))); end else case type(s) of ligature_node: begin f:=font(lig_char(s)); act_width:=act_width+ char_width(f)(char_info(f)(character(lig_char(s)))); end; hlist_node,vlist_node,rule_node,kern_node: act_width:=act_width+width(s); othercases confusion("disc4") @:this can't happen disc4}{\quad disc4@> endcases @z @x module 877 @!disc_break:boolean; {was the current break at a discretionary node?} @y @!disc_break:boolean; {was the current break at a discretionary node?} @!post_disc_break:boolean; {and did it have a nonempty post-break part?} @z @x ibid if cur_p<>null then @; @y if cur_p<>null then if not post_disc_break then @; @z @x module 881 q:=cur_break(cur_p); disc_break:=false; @y q:=cur_break(cur_p); disc_break:=false; post_disc_break:=false; @z @x module 883 if not is_char_node(s) then if next_break(cur_p)<>null then if cur_break(next_break(cur_p))=s then s:=r; @y that subtle bug is no longer possible so we can remove the code @z @x module 884 link(s):=r; r:=post_break(q); post_break(q):=null; @y link(s):=r; r:=post_break(q); post_break(q):=null; post_disc_break:=true; @z 377. Pick up a few discretionary hyphens that were lost because of the new (cautious) algorithm. @x module 914 @ @d advance_major_tail==begin major_tail:=link(major_tail); incr(r_count); end @= begin r:=get_node(small_node_size); @y @ In this repeat loop we will insert another discretionary if |hyf[j-1]| is odd, after both branches of the previous discretionary end at position |j-1|. Strictly speaking, we aren't justified in doing this, because we don't know that a hyphen after |j-1| is truly independent of those branches. But in almost all applications we would rather not lose a potentially valuable hyphenation point. (Consider the word `difficult', where the letter `c' is in position |j|.) @d advance_major_tail==begin major_tail:=link(major_tail); incr(r_count); end @= repeat r:=get_node(small_node_size); @z @x ibid i:=hyphen_passed; @y i:=hyphen_passed; hyf[i]:=0; @z @x ibid end @y hyphen_passed:=j-1; link(hold_head):=null; until not odd(hyf[j-1]) @z 378. Undumped trie must also be dumpable again (Breitenlohner, 11 Dec 89) @x module 1325 undump_size(0)(trie_size)('trie size')(j); {|trie_max|} for k:=0 to j do undump_hh(trie[k]); undump_size(0)(trie_op_size)('trie op size')(j); {|trie_op_ptr|} @y undump_size(0)(trie_size)('trie size')(j); @+init trie_max:=j;@+tini for k:=0 to j do undump_hh(trie[k]); undump_size(0)(trie_op_size)('trie op size')(j); @+init trie_op_ptr:=j;@+tini @z @x ibid k:=256; while j>0 do begin undump(0)(k-1)(k); undump(1)(j)(x); j:=j-x; op_start[k]:=qo(j); @y init for k:=0 to 255 do trie_used[k]:=min_quarterword;@+tini k:=256; while j>0 do begin undump(0)(k-1)(k); undump(1)(j)(x);@+init trie_used[k]:=qi(x);@+tini j:=j-x; op_start[k]:=qo(j); @z 379. Allow output routine to access page totals. (Suggested by Frank Mittelbach and Chris Rowley, December 1989) @x module 421 begin if page_contents=empty then @y begin if (page_contents=empty) and (not output_active) then @z 380. Slightly more robust recovery and detection of \output anomalies. (Suggested by Chris Thompson, provoked by George Russell, January 1990) @x module 1026 begin if loc<>null then @; @y begin if (loc<>null) or ((token_type<>output_text)and(token_type<>backed_up)) then @; @z @x module 1027 help2("Your sneaky output routine has fewer real {'s than }'s.")@/ @y help2("Your sneaky output routine has problematic {'s and/or }'s.")@/ @z 381. \eqno\aftergroup*$$ should yield * after the $$ (Michael Downes, 29 Jan 90) @x module 1194 begin cur_mlist:=p; cur_style:=text_style; mlist_penalties:=false; @y begin @; cur_mlist:=p; cur_style:=text_style; mlist_penalties:=false; @z @x ibid else begin @; @y else begin if a=null then @; @z 382. Missed a case in the 8-bit change (Wayne Sullivan, 1 Feb 1990) @x module 360 begin if (end_line_char<0)or(end_line_char>127) then incr(limit); @y begin if end_line_char_inactive then incr(limit); @z 383. Linebreaking needs to be more robust when total demerits get very high (Frank Mittelbach, 22 Feb 1990) @x module 830 @!artificial_badness:boolean; {has |b| been forced to zero?} @y @!artificial_demerits:boolean; {has |d| been forced to zero?} @z @x module 833 (this change is cosmetic only) @!minimal_demerits:array[very_loose_fit..tight_fit] of scaled; {best total demerits known for current line class and position, given the fitness} @!minimum_demerits:scaled; {best total demerits known for current line class @y @!minimal_demerits:array[very_loose_fit..tight_fit] of integer; {best total demerits known for current line class and position, given the fitness} @!minimum_demerits:integer; {best total demerits known for current line class @z @x module 836 here we want to ensure that total_demerits < awful_bad minimum_demerits:=minimum_demerits+abs(adj_demerits); @y if abs(adj_demerits)>=awful_bad-minimum_demerits then minimum_demerits:=awful_bad-1 else minimum_demerits:=minimum_demerits+abs(adj_demerits); @z @x module 851 begin @!stat artificial_badness:=false;@+tats@/ @y begin artificial_demerits:=false;@/ @z @x module 854 begin b:=0; {set badness zero, this break is forced} @!stat artificial_badness:=true;@+tats end @y artificial_demerits:=true {set demerits zero, this break is forced} @z @x module 855 @; @y if artificial_demerits then d:=0 else @; @z @x module 856 if artificial_badness then print_char("*")@+else print_int(b); @.*\relax@> print(" p="); print_int(pi); print(" d="); print_int(d); @y if b>inf_bad then print_char("*")@+else print_int(b); @.*\relax@> print(" p="); print_int(pi); print(" d="); if artificial_demerits then print_char("*")@+else print_int(d); @z @x module 859 d:=line_penalty+b; d:=d*d; @y begin d:=line_penalty+b; if abs(d)>=10000 then d:=100000000@+else d:=d*d; @z @x ibid if abs(fit_class-fitness(r))>1 then d:=d+adj_demerits @y if abs(fit_class-fitness(r))>1 then d:=d+adj_demerits; end @z 384. Math fonts may disappear outside of \eqno (Marc van Leeuwen). @x module 1194 if danger then flush_math; @y danger:=false; @; @z 385. Forgot to rule out charnode when testing for node type (Marc van Leeuwen). @x module 805 begin if type(q)=unset_node then @ else if type(q)=rule_node then @; @y begin if not is_char_node(q) then if type(q)=unset_node then @ else if type(q)=rule_node then @; @z @x module 903 if type(hb)=ligature_node then if odd(subtype(hb)) then @y if not is_char_node(hb) then if type(hb)=ligature_node then if odd(subtype(hb)) then @z @x module 1202 if p<>null then if type(p)=glue_node then d:=0; @y if p<>null then if not is_char_node(p) then if type(p)=glue_node then d:=0; @z 386. Don't change the font of punctuation before a hyphenated word (Scott Allendorf, reported 7 Mar 90) @x module 895 label common_ending,done,found,found1,not_found,not_found+1,exit; @y label common_ending,done,found,found1,found2,not_found,exit; @z @x module 903 if is_char_node(ha) then begin init_list:=ha; init_lig:=false; hu[0]:=qo(character(ha)); end else if type(ha)=ligature_node then begin init_list:=lig_ptr(ha); init_lig:=true; init_lft:=(subtype(ha)>1); hu[0]:=qo(character(lig_char(ha))); if init_list=null then if init_lft then begin hu[0]:=256; init_lig:=false; end; {in this case a ligature will be reconstructed from scratch} free_node(ha,small_node_size); end else goto not_found+1; {no punctuation found} s:=cur_p; {we have |cur_p<>ha| because |type(cur_p)=glue_node|} while link(s)<>ha do s:=link(s); j:=0; goto common_ending; not_found+1: j:=1; s:=ha; init_list:=null; if not is_char_node(r) then if type(r)=ligature_node then if subtype(r)>1 then begin j:=0; hu[0]:=256; init_lig:=false; end; @y if is_char_node(ha) then if font(ha)<>hf then goto found2 else begin init_list:=ha; init_lig:=false; hu[0]:=qo(character(ha)); end else if type(ha)=ligature_node then if font(lig_char(ha))<>hf then goto found2 else begin init_list:=lig_ptr(ha); init_lig:=true; init_lft:=(subtype(ha)>1); hu[0]:=qo(character(lig_char(ha))); if init_list=null then if init_lft then begin hu[0]:=256; init_lig:=false; end; {in this case a ligature will be reconstructed from scratch} free_node(ha,small_node_size); end else begin {no punctuation found; look for left boundary} if not is_char_node(r) then if type(r)=ligature_node then if subtype(r)>1 then goto found2; j:=1; s:=ha; init_list:=null; goto common_ending; end; s:=cur_p; {we have |cur_p<>ha| because |type(cur_p)=glue_node|} while link(s)<>ha do s:=link(s); j:=0; goto common_ending; found2: s:=ha; j:=0; hu[0]:=256; init_lig:=false; init_list:=null; @z 387. Balance the parens showing on the terminal (for Lispers). @x module 304 @!in_open : 0..max_in_open; {the number of lines in the buffer, less one} @y @!in_open : 0..max_in_open; {the number of lines in the buffer, less one} @!open_parens : 0..max_in_open; {the number of open text files} @z @x module 331 in_open:=0; max_buf_stack:=0; @y in_open:=0; open_parens:=0; max_buf_stack:=0; @z @x module 362 begin print_char(")"); force_eof:=false; update_terminal; {show user that file has been read} @y begin print_char(")"); decr(open_parens); update_terminal; {show user that file has been read} force_eof:=false; @z @x module 537 print_char("("); print(name); update_terminal; state:=new_line; @y print_char("("); incr(open_parens); print(name); update_terminal; state:=new_line; @z @x module 1334 if job_name=0 then open_log_file; @y if job_name=0 then open_log_file; while open_parens>0 do begin print(" )"); decr(open_parens); end; @z 388. Optimize \ifx\p\q after \let\p=\q (Marc van Leeuwen says that AmS-TeX uses this a lot). @x module 508 while (p<>null)and(q<>null) do if info(p)<>info(q) then p:=null else begin p:=link(p); q:=link(q); end; b:=((p=null)and(q=null)); @y if p=q then b:=true else begin while (p<>null)and(q<>null) do if info(p)<>info(q) then p:=null else begin p:=link(p); q:=link(q); end; b:=((p=null)and(q=null)); end; @z @x module 538 (while we're at it, might as well optimize this too) begin if not input_ln(cur_file,false) then do_nothing; @y begin if input_ln(cur_file,false) then do_nothing; @z @x module 1020 (and this) else begin wait:=false; s:=ins_ptr(p); link(last_ins_ptr(r)):=s; s:=last_ins_ptr(r); @y else begin wait:=false; s:=last_ins_ptr(r); link(s):=ins_ptr(p); @z 389. Treat migration properly in displays (Marc van Leeuwen). @x module 1199 (a bad bug that really has bitten) adjust_tail:=adjust_head; b:=hpack(p,natural); @y adjust_tail:=adjust_head; b:=hpack(p,natural); p:=list_ptr(b); @z @x module 1204 shift_amount(b):=s+d; append_to_vlist(b); if t<>adjust_head then begin link(tail):=link(adjust_head); tail:=t; end @y shift_amount(b):=s+d; append_to_vlist(b) @z @x module 1205 tail_append(new_penalty(post_display_penalty)); end else begin tail_append(new_penalty(post_display_penalty)); tail_append(new_param_glue(g2)); end @y g2:=0; end; if t<>adjust_head then {migrating material comes after equation number} begin link(tail):=link(adjust_head); tail:=t; end; tail_append(new_penalty(post_display_penalty)); if g2>0 then tail_append(new_param_glue(g2)) @z -----------Here I draw the line with respect to further changes 390. Uninitialized nullfont parameters (found by Lance Carnes, 11 May 90). @x module 552 hyphen_char[null_font]:="-"; skew_char[null_font]:=-1; @y hyphen_char[null_font]:="-"; skew_char[null_font]:=-1; bchar_label[null_font]:=non_address; font_bchar[null_font]:=non_char; font_false_bchar[null_font]:=non_char; @z 391. Disable \write{\the\prevgraf} (B. Jackowski, July 1990). @x module 422 begin nest[nest_ptr]:=cur_list; p:=nest_ptr; while abs(nest[p].mode_field)<>vmode do decr(p); scanned_result(nest[p].pg_field)(int_val); end @y if mode=0 then scanned_result(0)(int_val) {|prev_graf=0| within \.{\\write}} else begin nest[nest_ptr]:=cur_list; p:=nest_ptr; while abs(nest[p].mode_field)<>vmode do decr(p); scanned_result(nest[p].pg_field)(int_val); end @z 392. Report correct line number when buffer overflows (George Russell). @x module 538 begin if input_ln(cur_file,false) then do_nothing; firm_up_the_line; if end_line_char_inactive then decr(limit) else buffer[limit]:=end_line_char; first:=limit+1; loc:=start; line:=1; @y begin line:=1; if input_ln(cur_file,false) then do_nothing; firm_up_the_line; if end_line_char_inactive then decr(limit) else buffer[limit]:=end_line_char; first:=limit+1; loc:=start; @z 393. (I sincerely hope that there won't be any more) * Possibly nice ideas that will not be implemented . Classes of marks analogous to classes of insertions . \showcontext to show the current location without stopping for error . \everyeof to insert tokens before an \input file ends (strange example: \everyeof{\noexpand} will allow things like \xdef\a{\input foo}!) . generalize \leftskip and \rightskip to token lists (problems with displayed math then) . generalize \widowline and \clubline to go further into a paragraph * Bad ideas that will not be implemented . several people want to be able to remove arbitrary elements of lists, but that must never be done because some of those elements (e.g. kerns for accents) depend on floating point arithmetic . if anybody wants letter spacing desperately they should put it in their own private version (e.g. generalize the hpack routine) and NOT call it TeX.