DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 1 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 1 /* Dvi2ln3 translates a TeX DVI file to an LN03 format file. 2 3 Dvi2ln3 is still being developed. Copyright (c) 1985 by Digital Equipment 4 Corporation, Maynard, Massachusetts, USA. Author: Flavio Rose, 5 shasta!decwrl!dec-rhea!dec-dvinci!rose. 6 7 Dvi2ln3 is based on the publicly-available program DVItype, written by 8 David R. Fuchs of Stanford University; and also on earlier DEC programs for 9 the LN01 and LN03 laser printers, Dvi2lng, Topp and LN03Topp. This program 10 is not a DEC product and is not guaranteed to work. 11 12 Dvi2ln3 is written in VAX C. Specific VAX and VMS dependencies have 13 generally been avoided, however. The reader may find them by searching 14 for the strings VAX and VMS in this file. 15 16 During development, double square brackets [[ ]] in a comment indicate some 17 places where the code needs to be improved. 18 19 [[Among the useful things that still need to be done: differentiating 20 between int and long variables so this can be ported more easily to 16-bit 21 architectures; testing to see if malloc returns 0; a \special for ROM 22 fonts; a \special for sixels.]] 23 24 Development history: 25 26 Feb. 85: Did some early work on Dvi2ln3, translating bits and pieces 27 of Dvi2lng. Concluded, however, that it was better to translate 28 LN03Topp and Dvi2lng into C first. The reason for this is that code 29 which mimics an existing program is easier to write and to test. 30 31 5/15/85: At this date, the old LN03Topp program has been successfully 32 translated into C (except for the ability to read files over 33 DECnet). At this point, did some further cleanup of the Dvi2ln3 34 source. 35 36 6/4/85: Coding of Dvi2ln3 begins in earnest. Merging bits and 37 pieces from various places. Chucking chunks and all that 38 junk from LN03Topp; pass2 is just straightforward translation. 39 40 6/22/85: Cleanup after initial debugging. Ready to distribute. 41 42 10/14/85: Bug in parsing of \special's. Version 1. 43 44 */ 45 46 #include stdio 104 105 /* To please the VMS linker, we declare all global variables to be 106 globaldef. This is done with #define's, so it may easily be undone when DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 2 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 107 porting the program to other systems. */ 108 109 #ifdef vms 110 #define GLOBAL globaldef 111 #define EXTERN globalref 112 #else 113 X #define GLOBAL 114 X #define EXTERN extern 115 #endif 116 117 /* hoff is the horizontal offset in pixels to be added to all dimensions 118 read in; voff is the corresponding vertical offset. */ 119 120 GLOBAL int hoff, voff, startp; 121 GLOBAL FILE *dvifile,*tfmfile,*outfile; 122 123 /* Each page in a DVI file is identified by ten longwords, which appear 124 immediately after each bop (beginning of page) command. Dvi2ln3, like 125 DVItype, supports certain options that allow one to print only selected 126 pages. The following variables are used for this purpose. 127 128 Num_pages is a count of how many pages have been passed to the output. 129 Max_pages is the user-specified maximum number of pages to pass. 130 How_many_counts denotes the number of identifying longwords to take into 131 account when searching for the user-specified starting page. The user 132 specifies the starting page as the first one whose identifying longwords 133 match certain specified values, stored in start_page. However, identifying 134 longword i is only required to match the value in start_page[i] if 135 use_count[i] is nonzero. */ 136 137 GLOBAL long int num_pages,max_pages; 138 GLOBAL int how_many_counts,use_count[10]; 139 GLOBAL long int start_page[10]; 140 141 /* FILESPECLEN is the maximum size of a file specification under VMS. 142 [[Perhaps arrays of fixed size should not be used, but rather malloc should 143 be employed...]] */ 144 145 #define FILESPECLEN 252 146 147 /* The main routine deals with the command line arguments, opens the dvi 148 file, and then calls various other routines to handle the "passes". There 149 are two passes which involve reading the DVI file; in between, the font 150 load is constructed. */ 151 152 main(argc,argv) 153 int argc; 154 char *argv[]; 155 { 156 1 int status,i,jnam,jext; 157 1 char infnam[FILESPECLEN]; DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 3 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 158 1 159 1 if (argc < 2) { printf("\n Usage: Dvi2ln3 "); 160 2 goto exit_label; } 161 1 162 1 printf("\n Dvi2ln3 1"); 163 1 164 1 strcpy(infnam,argv[1]); 165 1 166 1 /* The extension of the input file defaults to .dvi. Locate the filename 167 1 field within the filespec parameter, set jname to point to beginning, jext 168 1 to point to one place after end. [[This code is of course dependent on the 169 1 VMS filespec syntax.]] */ 170 1 171 1 find_VMS_filename(infnam,&jnam,&jext); 172 1 if (infnam[jext] == '\0') strcat(infnam,".dvi"); 173 1 dvifile = fopen(infnam,"r"); 174 1 if (dvifile == NULL) { printf("\n Couldn't open dvi file"); 175 2 goto exit_label; } 176 1 177 1 /* Now decipher the options off the command line. */ 178 1 179 1 max_pages = 1000000000; 180 1 how_many_counts = 0; 181 1 hoff = 300; 182 1 voff = 300; 183 1 for (i=2; i= 0; j--) { 227 2 if (s[j] == ':' || s[j] == ']' || 228 2 s[j] == '>') { 229 3 jnam = j+1; 230 3 break; 231 3 } 232 2 } 233 1 234 1 jext = slen; 235 1 for (j = jnam; j < slen; j++) { 236 2 if (s[j] == '.' || s[j] == ';') { 237 3 jext = j; 238 3 break; 239 3 } 240 2 } 241 1 242 1 *ns = jnam; 243 1 *ne = jext; 244 1 } 245 246 /* ERROR HANDLING: Errors should be reported as close to the source as 247 possible, so that the maximum amount of information is available to the 248 user to identify the error. 249 250 Errors in the format of DVI or TFM files are not reported specifically, 251 since there exist programs, DVItype and TFtoPL, which diagnose errors in 252 such files. This program accepts some incorrect DVI files, for example, 253 those with a bad postamble or bad backpointers. [[However, someday we may 254 rewrite the program to select pages by using these features of the DVI 255 format, rather than by skipping unwanted pages.]] */ 256 257 GLOBAL char *bad_DVI_message = "\nBad DVI file - check it with DVItype"; 258 259 /* Command_line_options reads and processes options off the string s. At DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 5 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 260 this time, four options are supported. 261 262 The N option sets the maximum number of pages to be printed. Its syntax is 263 /N= . 264 265 The H option modifies the default horizontal offset. 266 267 The V option modifies the default vertical offset. 268 269 The S option has syntax /S={.}* where the {}* denotes 270 repetition, and a is either an integer or * to indicate any 271 value. An example would be "/S=*.8.3". 272 273 The meaning of the S option is as follows: In a DVI file, pages are 274 identified by ten longword values which follow each bop (beginning of page) 275 command. The value of the S option indicates which page to start printing 276 on. For example, "*.8.3" means start printing at the first page whose 277 second identifying longword is 8 and third is 3. */ 278 279 int command_line_options(t) 280 char *t; 281 { 282 1 long int i,k; 283 1 char *u; 284 1 285 1 while ((t = strchr(t,'/')) != 0) { 286 2 t++; 287 2 if (toupper(t[0]) == 'N' && t[1] == '=' 288 2 && (sscanf(&t[2],"%ld",&k) == 1)) 289 2 max_pages = k; 290 2 if (toupper(t[0]) == 'H' && t[1] == '=' 291 2 && (sscanf(&t[2],"%ld",&k) == 1)) 292 2 hoff = k; 293 2 if (toupper(t[0]) == 'V' && t[1] == '=' 294 2 && (sscanf(&t[2],"%ld",&k) == 1)) 295 2 voff = k; 296 2 else if (toupper(t[0]) == 'S' && t[1] == '=') { 297 3 t += 2; 298 3 how_many_counts = 0; 299 3 for (;;) { 300 4 if (t[0] == '*') { 301 5 use_count[how_many_counts] = 0; 302 5 how_many_counts++; 303 5 } 304 4 else if (sscanf(t,"%ld",&k) != 0) { 305 5 use_count[how_many_counts] = 1; 306 5 start_page[how_many_counts] = k; 307 5 how_many_counts++; 308 5 } else break; 309 4 u = strchr(t,'.'); 310 4 if (u == 0) break; DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 6 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 311 4 t = &u[1]; 312 4 } 313 3 } 314 2 } 315 1 } 316 317 /* Open_output_file opens one of the output files, using the file pointer 318 outfile. The name of the output file is obtained by appending the string 319 ext to the substring of infnam beginning at jnam and ending at jext. 320 321 [[This code contains a VMS depndency. We use creat followed by fdopen to 322 open the file as a normal VMS file ("rat=cr","rfm=var") rather than a 323 STREAM_LF file. Beginning with VAX C V2.0, this can be done by just calling 324 fopen.]] */ 325 326 int open_output_file(infnam,jnam,jext,ext) 327 char *infnam,*ext; 328 int jnam,jext; 329 { 330 1 char outfnam[FILESPECLEN]; 331 1 int jj; 332 1 333 1 strcpy(outfnam,&infnam[jnam]); 334 1 strcpy(&outfnam[jext-jnam],ext); 335 1 336 1 jj = creat(outfnam,0,"rat=cr","rfm=var"); 337 1 if (jj == -1) return(1); 338 1 outfile = fdopen(jj,"w"); 339 1 if (outfile == NULL) return(1); 340 1 341 1 return(0); 342 1 } 343 344 /* Bytes are read one by one from the DVI file using getc. We use an 345 overlay, as suggested in the DVItype documentation, to combine these bytes 346 into larger integers. [[Note that this technique relies on the fact that 347 numbers on the VAX are stored with the least significant byte first. The 348 macros below would have to be changed if the program were to be ported to a 349 machine architecture for which this is not so.]] 350 351 [[The use of getc is expensive, since getc is a function in VAX C V2.0. 352 Eventually, one would want to rewrite these macros to work like the old 353 getc macro.]] */ 354 355 GLOBAL union lc { long int l; unsigned long int ul; char c[4]; 356 unsigned char uc[4]; } lcx; 357 358 #define two_bytes_u lcx.uc[1] = getc(dvifile); \ 359 lcx.uc[0] = getc(dvifile); lcx.uc[2] = 0; lcx.uc[3] = 0 360 361 #define two_bytes_s lcx.c[1] = getc(dvifile); \ DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 7 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 362 lcx.c[0] = getc(dvifile); \ 363 if (lcx.c[1] >= 0) { lcx.uc[2] = 0; lcx.uc[3] = 0 ;} \ 364 else { lcx.uc[2] = 255; lcx.uc[3] = 255; } 365 366 #define three_bytes_u lcx.uc[3] = getc(dvifile); lcx.uc[1] = getc(dvifile); \ 367 lcx.uc[0] = getc(dvifile); lcx.uc[2] = 0 368 369 #define three_bytes_s lcx.c[2] = getc(dvifile); lcx.c[1] = getc(dvifile); \ 370 lcx.c[0] = getc(dvifile); \ 371 lcx.uc[3] = (lcx.c[2] >= 0) ? 0 : 255; 372 373 #define four_bytes lcx.c[3] = getc(dvifile); \ 374 lcx.c[2] = getc(dvifile); lcx.c[1] = getc(dvifile); \ 375 lcx.c[0] = getc(dvifile); 376 377 /* Knuth's programs like to hardcode fixed maximum sizes for various 378 things, for example, the maximum number of fonts allowed in a DVI file. In 379 general, it is preferable to use the C function malloc to allocate storage 380 as needed. That is what we generally do in this Dvi2ln3, but there are some 381 residues of the Knuthian approach, like MAXTEXFONTS below. By the way, we 382 never attempt to return any storage to the system. 383 384 [[Eventually, it would be better to get rid of MAXTEXFONTS and use a linked 385 list of records instead. There would be no cpu time penalty to using a 386 linked list, because the function set_curf below does a linear search 387 through the font array anyway.]] */ 388 389 #define MAXTEXFONTS 100 390 391 struct txf { unsigned char chu[256]; int bc, ec; long int space, design_size, 392 scaled_size; int nchs; }; 393 394 GLOBAL struct txf *txfa[MAXTEXFONTS+1]; 395 396 /* Font width information needs to be read from TFM files. TFM is a special 397 format defined by TeX. Dvi2ln3 stores each width in a longword. DVItype 398 tries to save space by a two-level width storage method. We just allocate 399 an array of widths for each font with malloc. 400 401 [[We don't check that font checksums match in Dvi2ln3, because there are a 402 lot of slightly obsolete TFMs floating around which would result in a 403 checksum error, but seem to give perfectly reasonable formatted output 404 nonetheless.]] */ 405 406 GLOBAL long int *font_width[MAXTEXFONTS+1]; 407 408 /* TeX fonts are referred to by their internal numbers, which go from 0 to 409 nf-1. The DVI file refers to them by external numbers, hence the array 410 to_ext used to convert internal numbers to external numbers. Curf is the 411 internal font number of the current font in the DVI file. */ 412 DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 8 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 413 GLOBAL int to_ext[MAXTEXFONTS+1], 414 nf, 415 curf; 416 417 /* In some switch statements, a lot of cases have to be enumerated. We 418 employ this Knuthian macro for that purpose: */ 419 420 #define four_cases(_x1) case _x1: case _x1+1: case _x1+2: case _x1+3: 421 422 /* We define a lot of constants corresponding to the DVI operation codes. 423 These are copied from DVItype. */ 424 425 #define id_byte 2 /* current version of the dvi format */ 426 #define set_char_0 0 /* typeset character 0 and move right */ 427 #define set1 128 /* typeset a character and move right */ 428 #define set_rule 132 /* typeset a rule and move right */ 429 #define put1 133 /* typeset a character */ 430 #define put_rule 137 /* typeset a rule */ 431 #define nop 138 /* no operation */ 432 #define bop 139 /* beginning of page */ 433 #define eop 140 /* ending of page */ 434 #define push 141 /* save the current positions */ 435 #define pop 142 /* restore previous positions */ 436 #define right1 143 /* move right */ 437 #define w0 147 /* move right by |w| */ 438 #define w1 148 /* move right and set |w| */ 439 #define x0 152 /* move right by |x| */ 440 #define x1 153 /* move right and set |x| */ 441 #define down1 157 /* move down */ 442 #define y0 161 /* move down by |y| */ 443 #define y1 162 /* move down and set |y| */ 444 #define z0 166 /* move down by |z| */ 445 #define z1 167 /* move down and set |z| */ 446 #define fnt_num_0 171 /* set current font to 0 */ 447 #define fnt1 235 /* set current font */ 448 #define xxx1 239 /* extension to dvi primitives (\special) */ 449 #define xxx4 242 /* potentially long extension to dvi primitives */ 450 #define fnt_def1 243 /* define the meaning of a font number */ 451 #define pre 247 /* preamble */ 452 #define post 248 /* postamble beginning */ 453 #define post_post 249 /* postamble ending */ 454 #define undefined_command 250 455 456 GLOBAL long int mag, num, den; 457 GLOBAL float conv, unmag_conv; 458 459 /* Read_preamble reads the preamble of the dvi file. The comment is thrown 460 away. The format version number is checked. The magnification, numerator, 461 and denominator are remembered in the globals mag, num, den. The float 462 values conv and unmag_conv serve to convert measurements from DVI units to 463 pixels. */ DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 9 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 464 465 int read_preamble() { 466 1 unsigned int i; 467 1 int j; 468 1 469 1 i = getc(dvifile); 470 1 if (i != pre) return(1); 471 1 i = getc(dvifile); 472 1 if (i != id_byte) return(1); 473 1 four_bytes; num = lcx.l; 474 1 if (num <= 0) return(1); 475 1 four_bytes; den = lcx.l; 476 1 if (den <= 0) return(1); 477 1 four_bytes; mag = lcx.l; 478 1 if (mag <= 0) return(1); 479 1 480 1 unmag_conv = (num/254000.0) * (300.0/den); 481 1 conv = unmag_conv * (mag/1000.0); 482 1 483 1 /* Skip over the comment field. */ 484 1 485 1 i = getc(dvifile); 486 1 for (j=0; j= set_char_0) && (o < set_char_0+128)) 509 1 return(o-set_char_0); 510 1 if ((o >= fnt_num_0) && (o < fnt_num_0+64)) 511 1 return(o-fnt_num_0); 512 1 switch (o) { 513 2 case set1: 514 2 case put1: DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 10 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 515 2 case fnt1: 516 2 case xxx1: 517 2 case fnt_def1: 518 2 i = getc(dvifile); 519 2 return(i); 520 2 case set1+1: 521 2 case put1+1: 522 2 case fnt1+1: 523 2 case xxx1+1: 524 2 case fnt_def1+1: 525 2 two_bytes_u; 526 2 return(lcx.ul); 527 2 case set1+2: 528 2 case put1+2: 529 2 case fnt1+2: 530 2 case xxx1+2: 531 2 case fnt_def1+2: 532 2 three_bytes_u; 533 2 return(lcx.ul); 534 2 case right1: 535 2 case w1: 536 2 case x1: 537 2 case down1: 538 2 case y1: 539 2 case z1: 540 2 return(getc(dvifile)); 541 2 case right1+1: 542 2 case w1+1: 543 2 case x1+1: 544 2 case down1+1: 545 2 case y1+1: 546 2 case z1+1: 547 2 two_bytes_s; 548 2 return(lcx.l); 549 2 case right1+2: 550 2 case w1+2: 551 2 case x1+2: 552 2 case down1+2: 553 2 case y1+2: 554 2 case z1+2: 555 2 three_bytes_s; 556 2 return(lcx.l); 557 2 case set_rule: 558 2 case put_rule: 559 2 case right1+3: 560 2 case w1+3: 561 2 case x1+3: 562 2 case down1+3: 563 2 case y1+3: 564 2 case z1+3: 565 2 case set1+3: DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 11 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 566 2 case put1+3: 567 2 case fnt1+3: 568 2 case xxx1+3: 569 2 case fnt_def1+3: 570 2 four_bytes; 571 2 return(lcx.l); 572 2 case w0: 573 2 return(w); 574 2 case x0: 575 2 return(x); 576 2 case y0: 577 2 return(y); 578 2 case z0: 579 2 return(z); 580 2 default: 581 2 return(0); 582 2 } 583 1 } 584 585 /* Pass1 reads from the DVI file until the starting page condition is met. 586 Return 1 if something goes wrong, or if the DVI file comes to an end. This 587 resembles skip_pages below. */ 588 589 int pass1() { 590 1 591 1 unsigned int k; 592 1 long int p; 593 1 int i; 594 1 char startp; 595 1 596 1 if (read_preamble() != 0) { 597 2 printf(bad_DVI_message); 598 2 return(1); 599 2 } 600 1 601 1 for (;;) { 602 2 if (feof(dvifile)) { 603 3 printf(bad_DVI_message); 604 3 return(1); 605 3 } 606 2 k = getc(dvifile); 607 2 if (k == post) return(0); 608 2 p = first_par(k); 609 2 if (k >= set_char_0 && k < set_char_0+128) k = set1; 610 2 if (k >= fnt_num_0 && k < fnt_num_0+64) k = fnt1; 611 2 612 2 switch (k) { 613 3 case bop: 614 3 startp = 1; 615 3 for (i=0; i<10; i++) { 616 4 four_bytes; DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 12 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 617 4 if (i < how_many_counts && use_count[i] && 618 4 lcx.l != start_page[i]) startp = 0; 619 4 } 620 3 four_bytes; 621 3 if (startp != 0) num_pages = 1; 622 3 else if (num_pages > 0) { 623 4 num_pages++; 624 4 if (num_pages > max_pages) return(0); 625 4 } 626 3 break; 627 3 case set_rule: 628 3 case put_rule: 629 3 four_bytes; 630 3 break; 631 3 four_cases(fnt_def1) 632 3 i = define_font(p); 633 3 if (i != 0) return(1); 634 3 break; 635 3 four_cases(fnt1) 636 3 if (num_pages > 0) set_curf(p); 637 3 break; 638 3 four_cases(set1) 639 3 four_cases(put1) 640 3 if (num_pages > 0) 641 3 txfa[curf] -> chu[p] = 1; 642 3 break; 643 3 four_cases(xxx1) 644 3 for (; p>0; p--) getc(dvifile); 645 3 break; 646 3 default: 647 3 break; 648 3 } 649 2 } 650 1 return(0); 651 1 } 652 653 #define leftfirst 33 654 #define rightfirst 161 655 #define leftlast 126 656 #define rightlast 254 657 658 /* The define of maxnfonts below is based on a belief, perhaps 659 superstitious, that there is a limit of 31 downline-loaded fonts in the 660 LN03. For us an nfont is two LN03 fonts, hence the following definition. */ 661 662 #define maxnfonts 16 663 664 /* Txf is a record structure describing a TeX font. Txfa is an array of txf 665 records. Txf2lnf describes the mapping between TeX fonts and pairs of LN03 666 fonts. Because the constructed LN03 font load has just the glyphs that are 667 needed, we can often cram more than one TeX font into a pair of LN03 fonts. DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 13 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 668 669 Why a pair of fonts? Because LN03 fonts are allowed to hold 94 glyphs only. 670 They come in two flavors, "left" which answer to character codes 33 to 126, 671 and "right" which answer to codes 161 to 254. LN03Topp assigns each TeX 672 font to one "lnfno", where each lnfno denotes a pair of LN03 fonts, one 673 left, one right. */ 674 675 GLOBAL int txf2lnf[MAXTEXFONTS]; 676 677 /* Maxfontnos reflects the fact that all LN03 fonts must be denoted by 678 a number from 10 to 19. */ 679 680 #define maxfontnos 9 681 682 GLOBAL int lastch[maxnfonts]; 683 GLOBAL unsigned char chw[maxnfonts][256]; 684 GLOBAL char fname[maxnfonts][32]; 685 686 /* The LN03 font-denoting numbers 10-19 have to be allocated among the 687 fonts. The useno array keeps track of which number a font is allowed to 688 use, -1 if none is currently allocated. The whouses array says which font 689 is using a number. */ 690 691 GLOBAL int useno[maxnfonts],whouses[maxfontnos]; 692 693 /* Font_name points to strings containing font names, which are created 694 with malloc as needed. */ 695 696 GLOBAL char *font_name[MAXTEXFONTS+1]; 697 698 GLOBAL int maxrmar,maxbmar; 699 700 #define max(x,y) (((x)>(y))?(x):(y)) 701 #define min(x,y) (((x)<(y))?(x):(y)) 702 703 /* Make_font_load calls on other procedures to generate the LN03 font load. 704 */ 705 706 int make_font_load() { 707 1 708 1 int i,j,jj,k,l,fno,maxfno,chsize; 709 1 long int totsize; 710 1 int lnfcnt,txfcnt,the_txf,txf_size,lnfleft; 711 1 int txford[MAXTEXFONTS]; 712 1 char cnt[3]; 713 1 714 1 totsize = 0; 715 1 chsize = 0; 716 1 curf = 0; 717 1 for (i=0; i nchs = 0; 762 2 for(i=0; i<256; i++) 763 2 if (txfa[fno] -> chu[i] != 0) txfa[fno] -> nchs++; 764 2 765 2 if (txfa[fno] -> nchs > 188) goto need_empty_slots; 766 2 chsize += txfa[fno] -> nchs; 767 2 } 768 1 printf("\nFont load to contain %d glyphs.",chsize); 769 1 DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 15 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 770 1 771 1 /* Now we have to allocate TeX fonts to LN03 fonts pairs and perform the 772 1 actual load. The goal is to use as few slots as possible, where an LN03 773 1 font pair with <= 94 glyphs is one slot, and a font pair with > 94 but <= 774 1 188 glyphs is two slots. 775 1 776 1 As in the LN01 case, the allocation problem seems to be some sort of hard 777 1 bin packing problem. (Proof of NP-hardness, anyone?) So we use a best fit 778 1 heuristic: 779 1 780 1 1. Find the unassigned largest TeX font. If none, exit, we're done. 781 1 782 1 2. Allocate an LN03 font pair for that TeX font and put the TeX 783 1 font into it. 784 1 785 1 3. Find the largest remaining TeX font that fits in what is left of 786 1 that LN03 font pair. 787 1 788 1 3.1. if none exists, go to 1. 789 1 3.2. if one exists, put it in the font pair and go back to 3. 790 1 791 1 The txford array contains the TeX font numbers in the order that they are 792 1 assigned. Txfcnt keeps track of how many TeX fonts have been assigned so 793 1 far. */ 794 1 795 1 lnfcnt = 0; 796 1 txfcnt = 0; 797 1 for (i=0; i nchs > txf_size) { 808 4 txf_size = txfa[j] -> nchs; 809 4 the_txf = j; 810 4 } 811 3 } 812 2 if (txf_size <= 0) goto assignment_done; 813 2 if (lnfcnt > maxnfonts) goto too_complex; 814 2 if (txf_size > lnfleft) goto need_empty_slots; 815 2 816 2 /* Now allocate new LN03 font pair and put the current TeX font into it */ 817 2 818 2 txf2lnf[the_txf] = lnfcnt; 819 2 txford[txfcnt] = the_txf; 820 2 txfcnt++; DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 16 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 821 2 k = leftfirst-1; 822 2 for (j = 0; j <= 255; j++) { 823 3 if (txfa[the_txf] -> chu[j] != 0) { 824 4 k++; 825 4 if (k == leftlast+1) k = rightfirst; 826 4 lnfleft--; 827 4 txfa[the_txf] -> chu[j] = k; 828 4 } 829 3 } 830 2 lastch[lnfcnt] = k; 831 2 832 2 /* Now try to fill the remaining part of the LN03 font pair using other TeX 833 2 fonts */ 834 2 835 2 while (1) { 836 3 837 3 txf_size = -1; 838 3 for (j = 0; j < MAXTEXFONTS; j++) { 839 4 if (txfa[j] != 0 && txf2lnf[j] == -1 840 4 && txfa[j] -> nchs > txf_size 841 4 && txfa[j] -> nchs <= lnfleft) { 842 5 txf_size = txfa[j] -> nchs; 843 5 the_txf = j; 844 5 } 845 4 } 846 3 if (txf_size <= 0) break; 847 3 848 3 txf2lnf[the_txf] = lnfcnt; 849 3 txford[txfcnt] = the_txf; 850 3 txfcnt++; 851 3 k = lastch[lnfcnt]; 852 3 for (j=0; j<=255; j++) { 853 4 if (txfa[the_txf] -> chu[j] != 0) { 854 5 k++; 855 5 lnfleft--; 856 5 if (k == leftlast+1) k = rightfirst; 857 5 txfa[the_txf] -> chu[j] = k; 858 5 } 859 4 } 860 3 lastch[lnfcnt] = k; 861 3 } 862 2 863 2 lnfcnt++; 864 2 } 865 1 866 1 assignment_done: 867 1 868 1 /* At this point the array txf2lnf is properly initialized, as are lastch 869 1 and txford. It remains to actually generate the desired font load. This has 870 1 to be done carefully, since the function add_txf_to_lnf only supports 871 1 adding glyphs to an LN03 font pair in ascending order of character code. */ DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 17 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 872 1 873 1 for (j=0; j 188 characters. Can't handle that.", 914 1 font_name[fno]); 915 1 return(1); 916 1 917 1 /* [[The error message above should be fixed to specify the magnification 918 1 of the font also.]] */ 919 1 920 1 } 921 922 /* The lines in the LN3 file are limited to lengths of about 100 bytes. We DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 18 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 923 keep track of how many bytes are written so far in the global lnhp. The 924 accounting is conservative, so e.g. each pixel position counts as 4 bytes 925 even though it might be shorter. [[One could easily increase 100 to 200. It 926 is not clear what problems are provoked by going over, say, 256.]] 927 928 Vpset keeps track of whether the vertical position needs to be output to 929 the LN03 file before setting any more characters. Hh_old keeps track of the 930 horizontal position which LN03 thinks it's at. */ 931 932 GLOBAL int ln3p,vpset,hh_old; 933 934 #define inc_ln3p(x) ln3p += x; if (ln3p > 100) \ 935 { ln3p = 0; vpset = 0; hh_old = 30000; } 936 937 /* [[In the above macro, hh_old is set to 30000 to mean "a very large 938 number" (the maximum valid hh for an LN03 is 2550), so as to force the code 939 below to re-output the true hh. What are the implications of this kludge? 940 Would it not be more reasonable to have instead an hhset variable?]] */ 941 942 /* A stack of hvxyzw values is kept; the stack pointer is called s. 943 [[Again, it would be better to make this stack a linked list.]] */ 944 945 #define STACKSIZE 100 946 947 GLOBAL long hstack[STACKSIZE], vstack[STACKSIZE], xstack[STACKSIZE], 948 ystack[STACKSIZE], zstack[STACKSIZE], wstack[STACKSIZE]; 949 GLOBAL int hhstack[STACKSIZE], vvstack[STACKSIZE]; 950 GLOBAL int s; 951 952 /* DVI files specify distances in units of 2^-16 points. When translating 953 to a device-specific format, it is necessary to round the DVI distances to 954 pixel units. This is done by means of the pixel_round macro. 955 956 However, rather than using this macro in the straightforward way, rounding 957 is often performed by more elaborate techniques, which we call "Stanford 958 rules" (after John Le Carre's "Moscow rules"). These rules make use of a 959 parameter MAX_DRIFT, which is roughly the maximum number of pixels that 960 things are allowed to deviate from straightforward rounding. */ 961 962 #define pixel_round(x) ((int) ((x<0) ? \ 963 (conv*(x)-0.5) : (conv*(x)+0.5))) 964 965 #define MAX_DRIFT 2 966 967 /* Pass2 reads the dvi file and interprets the commands in it, usually by 968 calling other routines. The interpretation generally consists of writing 969 something into the ln3 file, updating the current fonts and positions, and 970 possibly updating the stack. */ 971 972 int pass2() 973 { DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 19 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 974 1 int i,j; 975 1 long int p; 976 1 unsigned int k; 977 1 978 1 if (read_preamble() != 0) { 979 2 printf(bad_DVI_message); 980 2 return(1); 981 2 } 982 1 983 1 curf = 0; 984 1 ln3p = 0; 985 1 s = 0; 986 1 vpset = 0; 987 1 hh_old = 30000; 988 1 989 1 /* Skip pages until the desired starting page is reached. A nonzero value 990 1 is returned if the starting page is never encountered. */ 991 1 992 1 if (skip_pages() != 0) return(0); 993 1 994 1 for (;;) { 995 2 if feof(dvifile) { 996 3 printf(bad_DVI_message); 997 3 return(1); } 998 2 k = getc(dvifile); 999 2 if (k == post) return(0); 1000 2 if (k >= undefined_command) { 1001 3 printf(bad_DVI_message); 1002 3 return(1); } 1003 2 1004 2 p = first_par(k); 1005 2 1006 2 /* If the opcode is an "implicit parameter" opcode, either set_char_n and 1007 2 fnt_num_n, we change it to an explicit parameter opcode to make the case 1008 2 jumps more reasonable. */ 1009 2 1010 2 if (k >= set_char_0 && k < set_char_0+128) k = set1; 1011 2 if (k >= fnt_num_0 && k < fnt_num_0+64) k = fnt1; 1012 2 1013 2 j = do_command(k,p); 1014 2 if (j == 2) return(0); /* done with the required number of pages */ 1015 2 else if (j == 1) return(1); /* error encountered, stop */ 1016 2 1017 2 } 1018 1 } 1019 1020 /* Read from the DVI file until the starting page condition is met. Return 1021 1 if something goes wrong, or if the DVI file comes to an end. This 1022 function is copied quite closely from DVItype. */ 1023 1024 int skip_pages() { DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 20 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 1025 1 1026 1 unsigned int k; 1027 1 int i; 1028 1 long p,first_page; 1029 1 char startp; 1030 1 1031 1 for (;;) { 1032 2 if (feof(dvifile)) return(1); 1033 2 k = getc(dvifile); 1034 2 if (k == post) return(1); 1035 2 p = first_par(k); 1036 2 if (k >= set_char_0 && k < set_char_0+128) k = set1; 1037 2 if (k >= fnt_num_0 && k < fnt_num_0+64) k = fnt1; 1038 2 1039 2 switch (k) { 1040 3 case bop: 1041 3 startp = 1; 1042 3 for (i=0; i<10; i++) { 1043 4 four_bytes; 1044 4 if (i == 0) first_page = lcx.l; 1045 4 if (i < how_many_counts && use_count[i] && 1046 4 lcx.l != start_page[i]) startp = 0; 1047 4 } 1048 3 four_bytes; 1049 3 if (startp != 0) { 1050 4 v = 0; vv = 0; h = 0; hh = 0; 1051 4 printf("\n [%ld]",first_page); 1052 4 num_pages = 1; return(0); } 1053 3 break; 1054 3 case set_rule: 1055 3 case put_rule: 1056 3 four_bytes; 1057 3 break; 1058 3 four_cases(fnt_def1) 1059 3 i = define_font(p); 1060 3 if (i != 0) return(1); 1061 3 break; 1062 3 four_cases(xxx1) 1063 3 for (; p>0; p--) getc(dvifile); 1064 3 break; 1065 3 default: 1066 3 break; 1067 3 } 1068 2 } 1069 1 return(0); 1070 1 } 1071 1072 /* Do_command performs the DVI command of code k, assuming the "first 1073 parameter" is p. It is assumed that k is not one of set_char0 through 1074 set_char127. */ 1075 DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 21 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 1076 int do_command(k,p) 1077 int k; 1078 long p; 1079 { 1080 1 int i,j,l,lnf; 1081 1 1082 1 switch (k) { 1083 2 four_cases(fnt_def1) 1084 2 define_font_pass2(); 1085 2 break; 1086 2 1087 2 /* [[In processing the put and set DVI commands, no check is made that the 1088 2 character being set actually exists in the font. This can lead to messy 1089 2 errors, like access violations or garbage values when one tries to find 1090 2 that character's width. Neither is any check made that the horizontal and 1091 2 vertical positions fall within the page.]] */ 1092 2 1093 2 four_cases(put1) 1094 2 four_cases(set1) 1095 2 if (!vpset) { 1096 3 fprintf(outfile,"\n\033[%dd\033[%d`",vv+voff,hh+hoff); 1097 3 ln3p = 16; 1098 3 vpset = 1; 1099 3 hh_old = hh; 1100 3 } 1101 2 if (hh_old != hh) { 1102 3 if (hh > hh_old) fprintf(outfile,"\033[%da",hh-hh_old); 1103 3 else fprintf(outfile,"\033[%d`",hh+hoff); 1104 3 ln3p += 7; 1105 3 } 1106 2 putc(txfa[curf] -> chu[p],outfile); 1107 2 inc_ln3p(1); 1108 2 if (k >= put1) { 1109 3 hh_old = hh; 1110 3 break; 1111 3 } 1112 2 h += font_width[curf][p]; 1113 2 1114 2 /* In rounding h to generate the pixel-position hh, Stanford rules (see 1115 2 above) come into play. We set the new hh (horizontal position in pixels) to 1116 2 the value obtained by adding the pixel width of the character being set to 1117 2 the current position. We then correct this value so that it does not exceed 1118 2 the rounded version of the true position by more than MAX_DRIFT pixels. 1119 2 1120 2 Note that if we did not apply Stanford rules here, or equivalently if we 1121 2 set MAX_DRIFT to zero, many more set-X-position commands would appear in 1122 2 the output. */ 1123 2 1124 2 hh += chw[txf2lnf[curf]][txfa[curf] -> chu[p]]; 1125 2 hh_old = hh; 1126 2 l = pixel_round(h); DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 22 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 1127 2 if (hh-l > MAX_DRIFT) hh = l+MAX_DRIFT; 1128 2 else if (l-hh > MAX_DRIFT) hh = l-MAX_DRIFT; 1129 2 break; 1130 2 1131 2 four_cases(fnt1) 1132 2 set_curf(p); 1133 2 lnf = txf2lnf[curf]; 1134 2 if (useno[lnf] == -1) { 1135 3 useno[whouses[maxfontnos]] = -1; 1136 3 useno[lnf] = maxfontnos; 1137 3 whouses[maxfontnos] = lnf; 1138 3 fprintf(outfile,"\033P1;1%d}%16s\033\\",maxfontnos, 1139 3 fname[lnf]); 1140 3 inc_ln3p(26); 1141 3 } 1142 2 fprintf(outfile,"\033[1%dm",useno[lnf]); 1143 2 inc_ln3p(5); 1144 2 break; 1145 2 1146 2 case set_rule: 1147 2 case put_rule: 1148 2 1149 2 /* When converting rule dimensions to pixel dimensions, we do not follow 1150 2 Stanford rules. Rather, we just round the true positions to obtain the 1151 2 pixel positions. This avoids unsightly gaps between rules. [[It should not 1152 2 cause much of a problem with typical rule applications (ruled tables, 1153 2 fraction bars)...but perhaps with large delimiters there might be some 1154 2 difficulty. This needs more thought...]] */ 1155 2 1156 2 four_bytes; 1157 2 if (p >= 0 && lcx.l >= 0) 1158 2 do_rule(pixel_round(h), 1159 2 pixel_round(v-p),pixel_round(h+lcx.l), 1160 2 pixel_round(v)); 1161 2 if (k == set_rule) { 1162 3 h += lcx.l; 1163 3 hh = pixel_round(h); 1164 3 } 1165 2 break; 1166 2 1167 2 case push: 1168 2 s++; 1169 2 if (s == STACKSIZE) { 1170 3 printf("\n Stack too deep for Dvi2ln3"); 1171 3 return(1); 1172 3 } 1173 2 xstack[s] = x; 1174 2 ystack[s] = y; 1175 2 vstack[s] = v; 1176 2 hstack[s] = h; 1177 2 vvstack[s] = vv; DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 23 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 1178 2 hhstack[s] = hh; 1179 2 wstack[s] = w; 1180 2 zstack[s] = z; 1181 2 break; 1182 2 1183 2 case pop: 1184 2 if (s == 0) { 1185 3 printf(bad_DVI_message); 1186 3 return(1); 1187 3 } 1188 2 if (vv != vvstack[s]) vpset = 0; 1189 2 x = xstack[s]; 1190 2 y = ystack[s]; 1191 2 v = vstack[s]; 1192 2 h = hstack[s]; 1193 2 vv = vvstack[s]; 1194 2 hh = hhstack[s]; 1195 2 w = wstack[s]; 1196 2 z = zstack[s]; 1197 2 s--; 1198 2 break; 1199 2 1200 2 /* Right now there are no \special's defined, so when we get a \special, we 1201 2 just skip over it. */ 1202 2 1203 2 four_cases(xxx1) 1204 2 for (; p != 0; p--) getc(dvifile); 1205 2 break; 1206 2 1207 2 case bop: 1208 2 1209 2 /* If we've done the required number of pages, we'll skip the rest of the 1210 2 DVI file. If not, type the first parameter of bop on the user's terminal 1211 2 the way TeX does, to give an indication of progress. */ 1212 2 1213 2 if (num_pages == max_pages) return(2); 1214 2 v = 0; vv = 0; h = 0; hh = 0; 1215 2 vpset = 0; hh_old = 100000; 1216 2 four_bytes; 1217 2 if (num_pages%12 == 0) printf("\n"); 1218 2 printf(" [%ld]",lcx.ul); 1219 2 num_pages++; 1220 2 for (i = 0; i<40; i++) getc(dvifile); 1221 2 break; 1222 2 1223 2 case eop: 1224 2 fprintf(outfile,"\n\f"); 1225 2 ln3p = 0; 1226 2 break; 1227 2 1228 2 /* Now we have to consider the cases for pure motion. */ DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 24 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 1229 2 1230 2 four_cases(right1) 1231 2 set_h(h+p); 1232 2 break; 1233 2 four_cases(x1) 1234 2 x = p; 1235 2 case x0: 1236 2 set_h(h+x); 1237 2 break; 1238 2 four_cases(y1) 1239 2 y = p; 1240 2 case y0: 1241 2 set_v(v+y); 1242 2 break; 1243 2 four_cases(w1) 1244 2 w = p; 1245 2 case w0: 1246 2 set_h(h+w); 1247 2 break; 1248 2 four_cases(z1) 1249 2 z = p; 1250 2 case z0: 1251 2 set_v(v+z); 1252 2 break; 1253 2 four_cases(down1) 1254 2 set_v(v+p); 1255 2 break; 1256 2 1257 2 } 1258 1 return(0); 1259 1 } 1260 1261 /* Set_curf sets the current font to external number p. Note that the 1262 current font is maintained as an internal font number. */ 1263 1264 int set_curf(p) 1265 int p; 1266 { 1267 1 to_ext[nf] = p; 1268 1 curf = 0; 1269 1 while (to_ext[curf] != p) { curf++; } 1270 1 } 1271 1272 /* Define_font processes a font definition from the DVI file. The TFM file 1273 for the font is read at this point from the directory TEX$FONTS. */ 1274 1275 int define_font(e) 1276 int e; 1277 { 1278 1 int i; 1279 1 unsigned char p,n; DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 25 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 1280 1 if (e == MAXTEXFONTS) { printf("\n Too many fonts for Dvi2ln3"); 1281 2 return(1); } 1282 1 txfa[nf] = malloc(sizeof(struct txf)); 1283 1 to_ext[nf] = e; 1284 1 four_bytes; 1285 1 four_bytes; 1286 1 txfa[nf] -> scaled_size = lcx.l; 1287 1 four_bytes; 1288 1 txfa[nf] -> design_size = lcx.l; 1289 1 for (i=0; i<256; i++) txfa[nf] -> chu[i] = '\0'; 1290 1 p = getc(dvifile); n = getc(dvifile); 1291 1 font_name[nf] = malloc(p+n+1); 1292 1 for (i=0; i scaled_size <= 0 || txfa[nf] -> scaled_size >= 1296 1 8*8*8*8*8*8*8*8*8) { 1297 2 printf("\n Font %s has a bad scaled size",font_name[nf]); 1298 2 return(1); 1299 2 } 1300 1 if (txfa[nf] -> design_size <= 0 || txfa[nf] -> design_size >= 1301 1 8*8*8*8*8*8*8*8*8) { 1302 2 printf("\n Font %s has a bad design size",font_name[nf]); 1303 2 return(1); 1304 2 } 1305 1 1306 1 /* We follow DVItype and compute for each font a "space" parameter which is 1307 1 one-sixth of the scaled design size. This parameter is used in rounding the 1308 1 horizontal position to pixels according to "Stanford rules." See the 1309 1 function set_h below. */ 1310 1 1311 1 txfa[nf] -> space = txfa[nf] -> scaled_size/6; 1312 1 1313 1 i = read_tfm_file(); 1314 1 if (i != 0) return(i); 1315 1 nf++; 1316 1 return(0); 1317 1 1318 1 } 1319 1320 /* TFM files, like the DVI file, are read with getc, foolish as that may 1321 seem. We use the same overlays that are used for merging DVI bytes into 1322 longwords. However, since the TFM file consists of longwords, only 1323 tfm_longword is need. [[This is also VAX dependent. It would not be 1324 possible to use stdio's longword reading function getw here, because the 1325 bytes have to be reversed.]] */ 1326 1327 #define tfm_longword { lcx.uc[3] = getc(tfmfile); \ 1328 lcx.uc[2] = getc(tfmfile); lcx.uc[1] = getc(tfmfile); \ 1329 lcx.uc[0] = getc(tfmfile); } 1330 DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 26 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 1331 /* Read_tfm_file obtains the character widths from the TFM file 1332 corresponding to font nf. */ 1333 1334 int read_tfm_file() { 1335 1 1336 1 int i,lh,nw; 1337 1 int info[256]; 1338 1 long z,alpha,beta; 1339 1 long width[256]; 1340 1 1341 1 open_tfm_file(); 1342 1 if (tfmfile == NULL) { 1343 2 printf("\n Can't open TFM file for font %s",font_name[nf]); 1344 2 return(1); } 1345 1 1346 1 /* The TFM format is described in some issue of the TUGBoat (TeX users' 1347 1 group newsletter), and in the comments to the program TFtoPL. Here we 1348 1 summarize those aspects of TFM format that are relevant to the task of 1349 1 extracting the widths of the characters. 1350 1 1351 1 The first 24 bytes of a TFM file contain twelve 16-bit integers that give 1352 1 the lengths of the various subsequent portions of the file. The ones 1353 1 relevant to our purposes are LH, length of the header data, BC, the 1354 1 smallest character code in the font, EC, the largest character code in the 1355 1 font, and NW, number of words in the width table. So, we read those right 1356 1 now, and then skip over the remainder, and then over a set of LH longwords 1357 1 called the "header." */ 1358 1 1359 1 tfm_longword; 1360 1 lh = 256*lcx.uc[1] + lcx.uc[0]; 1361 1 tfm_longword; 1362 1 txfa[nf] -> bc = 256*lcx.uc[3] + lcx.uc[2]; 1363 1 txfa[nf] -> ec = 256*lcx.uc[1] + lcx.uc[0]; 1364 1 tfm_longword; 1365 1 nw = 256*lcx.uc[3] + lcx.uc[2]; 1366 1 if (txfa[nf] -> bc > 255 || txfa[nf] -> ec > 255 || 1367 1 txfa[nf] -> bc > txfa[nf] -> ec || nw > 256) { 1368 2 printf("\n Bad TFM file for font %s",font_name[nf]); 1369 2 return(1); 1370 2 } 1371 1 1372 1 for(i=0; i ec-txfa[nf] -> bc+1; i++) { 1380 2 tfm_longword; 1381 2 if (lcx.uc[3] >= nw) { DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 27 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 1382 3 printf("\n Bad TFM file for font %s",font_name[nf]); 1383 3 return(1); 1384 3 } 1385 2 info[i] = lcx.uc[3]; 1386 2 } 1387 1 1388 1 /* The widths are stored in a rather strange format known as a "fix-word." 1389 1 A nonnegative width is expressed in "fix-word" format by expressing it in 1390 1 units of 2^-20 times the design size. A negative width is expressed in 1391 1 "fix-word" format by expressing its negative in those units, and then 1392 1 changing the most significant byte to 255. 1393 1 1394 1 One needs to convert these widths into DVI units, multiplying by the scaled 1395 1 design size according to a certain arcane algorithm. The algorithm is 1396 1 copied from DVItype, to which we refer the reader for an explanation. */ 1397 1 1398 1 z = txfa[nf] -> scaled_size; 1399 1 alpha = 16*z; beta = 16; 1400 1 while (z >= 4*(8*8*8*8*8*8*8)) { z = z/2; beta = beta/2; } 1401 1 for(i=0; i ec+1)); 1415 1 1416 1 for (i=0; i bc; i++) font_width[nf][i] = 0; 1417 1 for (i=txfa[nf] -> bc; i <= txfa[nf] -> ec; i++) 1418 1 font_width[nf][i] = width[info[i-txfa[nf] -> bc]]; 1419 1 return(0); 1420 1 } 1421 1422 /* Open_tfm_file finds and opens the tfm file corresponding to a font nf. 1423 The global file variable tfmfile is used to hold the file pointer. [[This 1424 function will not work if the TFM file lies over the net on a VMS V3.x 1425 host, because C file opens do not work in such circumstances. The problem 1426 can be ignored, because eventually there should be no VMS V3.x hosts 1427 left.]] */ 1428 1429 int open_tfm_file () { 1430 1 1431 1 int jext,jnam; 1432 1 char filespec[FILESPECLEN]; DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 28 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 1433 1 1434 1 find_VMS_filename(font_name[nf],&jnam,&jext); 1435 1 filespec[0] = '\0'; 1436 1 1437 1 /* If there is no directory part, fill in using the logical tex$fonts */ 1438 1 1439 1 if (jnam == 0) strcpy(filespec,"tex$fonts:"); 1440 1 strcat(filespec,font_name[nf]); 1441 1 1442 1 /* if there is no extension, add the extension ".tfm" */ 1443 1 1444 1 if (font_name[nf][jext] == '\0') strcat(filespec,".tfm"); 1445 1 tfmfile = fopen(filespec,"r"); 1446 1 1447 1 } 1448 1449 /* Define_font_pass2 skips a font definition from the DVI file. */ 1450 1451 int define_font_pass2() 1452 { 1453 1 unsigned char p,n; 1454 1 int i; 1455 1 four_bytes; 1456 1 four_bytes; 1457 1 four_bytes; 1458 1 p = getc(dvifile); n = getc(dvifile); 1459 1 for (i=0; i xx1) { j = xx0; xx0 = xx1; xx1 = j; } 1479 1 if (yy0 > yy1) { j = yy0; yy0 = yy1; yy1 = j; } 1480 1 1481 1 if ((yy1 != yy0 && xx1 != xx0)) { 1482 2 fprintf(outfile,"\033[1;%d;%d;%d;%d!|", 1483 2 xx0,yy0,yy1-yy0,xx1-xx0); DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 29 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) 1484 2 inc_ln3p(25); 1485 2 } 1486 1 } 1487 1488 /* Set_v is called to execute vertical-position-altering commands, other 1489 than pops. It modifies v and vv, and outputs the vertical position to the 1490 LN3 file. We don't follow Stanford rules here. They sometimes set the 1491 vertical position in pixels vv to something other than the rounded value of 1492 v. Not following Stanford rules implies, for example, that the relative 1493 vertical positions of an accent and its accentee may differ by one pixel 1494 according to how the baseline of the accentee gets rounded. [[This should 1495 perhaps be fixed.]] */ 1496 1497 int set_v(v1) 1498 int v1; 1499 { 1500 1 int l; 1501 1 1502 1 l = pixel_round(v1); 1503 1 v = v1; 1504 1 vv = l; 1505 1 vpset = 0; 1506 1 } 1507 1508 /* Set_h is called whenever a DVI command is encountered that alters the 1509 horizonal position, other than a set_char, set_rule or pop. It sets h to 1510 the new value, and alters hh according to Stanford rules, printing the new 1511 hh in the LN3 file. */ 1512 1513 int set_h(new_h) 1514 int new_h; 1515 { 1516 1 int l,old_hh; 1517 1 1518 1 old_hh = hh; 1519 1 l = pixel_round(new_h); 1520 1 if (txfa[curf] == 0 || new_h-h >= txfa[curf] -> space 1521 1 || new_h-h <= -4*txfa[curf] -> space) hh = l; 1522 1 else { 1523 2 hh += pixel_round(new_h-h); 1524 2 if (hh-l > MAX_DRIFT) hh = l+MAX_DRIFT; 1525 2 else if (hh-l < -MAX_DRIFT) hh = l-MAX_DRIFT; 1526 2 } 1527 1 h = new_h; 1528 1 return(0); 1529 1 } Command Line ------------ DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 30 V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1) CC/DEB/LIS DVI2LN3