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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 <filename> <options>");
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<argc; i++) command_line_options(argv[i]);
184 1
185 1 status = pass1();
186 1 if (status != 0) goto exit_label;
187 1 if (rewind(dvifile) == -1) {
188 2 printf("\n Couldn't rewind dvi file.");
189 2 goto exit_label;
190 2 }
191 1
192 1 status = open_output_file(infnam,jnam,jext,".ln3");
193 1 if (status != 0) { printf("\n Couldn't open output file");
194 2 goto exit_label; }
195 1
196 1 status = make_font_load();
197 1 if (status != 0) goto exit_label;
198 1
199 1 pass2();
200 1
201 1 fprintf(outfile,"\033c");
202 1 fclose(dvifile);
203 1 fclose(outfile);
204 1
205 1 exit_label:
206 1 ;
207 1 }
208
DVI2LN3 14-OCT-1985 13:19:13 VAX C V2.0-003 Page 4
V1.0 14-OCT-1985 13:19:01 USER$4:[TEX.LN03.SOURCES]DVI2LN3.C;40 (1)
209 /* Find_VMS_filename finds the filename part of a VMS filespec passed in s,
210 returning the index of the first character in *ns, and the index of the
211 character after the last in *ne.
212
213 [[When porting Dvi2ln3 to a non-VMS system, we need to find an alternative
214 to this function. Under Unix, as a first approximation, we could look for
215 the last "/" or "~" and then for the first succeeding "." in the filespec.
216 Is this correct?]] */
217
218 int find_VMS_filename(s,ns,ne)
219 char s[];
220 int *ns,*ne;
221 {
222 1 int jnam,jext,j,slen;
223 1
224 1 slen = strlen(s);
225 1 jnam = 0;
226 1 for (j = slen-1; j >= 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=<integer> .
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=<pagespec>{.<pagespec>}* where the {}* denotes
270 repetition, and a <pagespec> 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<i; j++) getc(dvifile);
487 1 return(0);
488 1 }
489
490 /* The dvi file format requires us to keep track of various quantities,
491 among them the horizontal and vertical positions h and v, and four values
492 referred to simply as x, y, z and w. We also keep pixel-rounded versions
493 of h and v, called hh and vv. */
494
495 GLOBAL long h, v, x, y, z, w;
496 GLOBAL int hh, vv;
497
498 /* The following function, copied from DVItype, reads from the DVI file the
499 first parameter of the current DVI command. In the case of functions whose
500 first parameter is implicit, such as set_char_0 through set_char_127, the
501 implicit parameter is returned. */
502
503 long first_par(o)
504 int o;
505 {
506 1 unsigned int i;
507 1
508 1 if ((o >= 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
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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
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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.
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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<maxnfonts; i++)
718 1 for (j=0; j<256; j++) chw[i][j] = 0;
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719 1
720 1 for (jj=0; jj<MAXTEXFONTS; jj++) txf2lnf[jj] = -1;
721 1
722 1 /* Fill the fname strings with different valid LN03 font names. */
723 1
724 1 for (i=0; i<maxnfonts; i++)
725 1 strcpy(fname[i],"U000000002SK00GG0001UZZZZ02F000");
726 1 for (jj=1; jj<maxnfonts; jj++) {
727 2 sprintf(cnt,"%02d",jj);
728 2 strncpy(&(fname[jj][5]),cnt,2);
729 2 }
730 1
731 1 /* The margins are set to values appropriate for American 8 1/2 by 11
732 1 paper. It is not clear if this needs to be changed for European A4 paper.
733 1 Not changing it might deprive Europeans of access to the bottom 1.5cm of
734 1 their paper. */
735 1
736 1 maxrmar = 2550;
737 1 maxbmar = 3300;
738 1
739 1 /* In the following, esc[?27h means "advance the carriage by the character
740 1 width when you set a character", esc[11h and esc[7 I together mean to
741 1 interpret all dimensions in escape sequences as pixel units; esc[?52h means
742 1 our origin of coordinates is the upper left edge of the paper; esc[%dt
743 1 means the "maximum length" of the paper is maxbmar pixels. */
744 1
745 1 fprintf(outfile,"\033c\033[?27h\033[11h\033[7 I\033[?52h\033[%dt\n",
746 1 maxbmar);
747 1
748 1 for (i=0; i<maxnfonts; i++) useno[i] = -1;
749 1 for (i=0; i<maxfontnos; i++) whouses[i] = -1;
750 1 maxfno = -1;
751 1
752 1 /* Write font loading escape sequence onto outf. [[It may be desirable to
753 1 make this escape sequence clear all dowloaded fonts from RAM.]] */
754 1
755 1 fprintf(outfile,"\033P0;1;1y");
756 1
757 1 /* Count how many glyphs each font requires. */
758 1
759 1 for (fno=0; fno<nf; fno++) {
760 2
761 2 txfa[fno] -> 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
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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<MAXTEXFONTS; i++) txford[i] = -1;
798 1
799 1 while (1) {
800 2
801 2 /* Find largest unassigned TeX font */
802 2
803 2 lnfleft = rightlast-rightfirst+1+leftlast-leftfirst+1;
804 2 txf_size = -1;
805 2 for (j = 0; j < MAXTEXFONTS; j++) {
806 3 if (txfa[j] != 0 && txf2lnf[j] == -1
807 3 && txfa[j] -> 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++;
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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. */
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872 1
873 1 for (j=0; j<txfcnt; j++) {
874 2 k = txford[j];
875 2 if (j != 0 && txf2lnf[k] != txf2lnf[txford[j-1]])
876 2 fprintf(outfile,",\n");
877 2 totsize += add_txf_to_lnf(txf2lnf[k],k);
878 2 }
879 1
880 1 /* [[At this point we ought to add code that writes a message saying how
881 1 much font RAM the load will occupy. But there is no documentation for
882 1 determining that! So, we make the following compromise:]] */
883 1
884 1 printf("\n Approximate size of font load: %ld bytes",totsize);
885 1
886 1 /* [[We may want to insert a few \n's in the following to keep the line
887 1 from getting too long.]] */
888 1
889 1 fprintf(outfile,"\n;Dvi2ln3 1 font load\033\\");
890 1 fprintf(outfile,"\033[1;%ds\033[%dt\033[1;%dr",maxrmar,maxbmar,maxbmar);
891 1 for (j=0; j <= min(maxfontnos,lnfcnt-1); j++) {
892 2 useno[j] = j;
893 2 whouses[j] = j;
894 2 k = fname[j][16];
895 2 fname[j][16] = '\0';
896 2 fprintf(outfile,"\033P1;1%d}%s\033\\",j,fname[j]);
897 2 fname[j][16] = k;
898 2 }
899 1 fprintf(outfile,"\033[10m");
900 1
901 1 return(0);
902 1
903 1 too_complex:
904 1 printf("\n Can't construct a font load:");
905 1 printf("\n Dvi file uses too many glyphs from too many different fonts.");
906 1 return(1);
907 1
908 1 /* [[We need to determine what the real limit is on the number of LN03
909 1 fonts, and refine the test to detect if it is being exceeded. Fortunately,
910 1 only a very complex DVI file could exceed the limit.]] */
911 1
912 1 need_empty_slots:
913 1 printf("\nFont %s uses > 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
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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 {
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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() {
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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
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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);
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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;
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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. */
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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;
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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<p+n; i++) { font_name[nf][i] = getc(dvifile); }
1293 1 font_name[nf][p+n] = '\0';
1294 1
1295 1 if (txfa[nf] -> 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
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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<lh+3; i++) tfm_longword;
1373 1
1374 1 /* After the header, there are two arrays in the TFM file that interest us.
1375 1 The first, INFO, is EC-BC+1 longwords long and contains pointers to the
1376 1 second, WIDTH, which is NW longwords long. For each character i, the width
1377 1 of i is WIDTH[INFO[i-BC]]. We read these arrays into memory. */
1378 1
1379 1 for(i=0; i<txfa[nf] -> ec-txfa[nf] -> bc+1; i++) {
1380 2 tfm_longword;
1381 2 if (lcx.uc[3] >= nw) {
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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<nw; i++) {
1402 2 tfm_longword;
1403 2 width[i] = ( ( (lcx.uc[0]*z)/256 + lcx.uc[1]*z )/256 +
1404 2 lcx.uc[2]*z)/beta;
1405 2 if (lcx.uc[3] == 255) width[i] -= alpha;
1406 2 }
1407 1
1408 1 fclose(tfmfile);
1409 1
1410 1 /* Using these two arrays, we now compute the widths of the characters in
1411 1 the fonts and place them into two malloc'ed arrays, one for the widths in
1412 1 DVI units, one for the width in pixel units. */
1413 1
1414 1 font_width[nf] = malloc(4*(txfa[nf] -> ec+1));
1415 1
1416 1 for (i=0; i<txfa[nf] -> 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];
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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<p+n; i++) getc(dvifile);
1460 1 }
1461
1462 /* Do_rule writes into the ln3 file the escape sequence corresponding
1463 to a rule. */
1464
1465 int do_rule(xx0,yy0,xx1,yy1)
1466 int xx0,yy0,xx1,yy1;
1467 {
1468 1 int j;
1469 1
1470 1 xx0 = min(xx0+hoff,maxrmar);
1471 1 xx1 = min(xx1+hoff,maxrmar);
1472 1 xx0 = max(xx0,0);
1473 1 xx1 = max(xx1,0);
1474 1 yy0 = min(yy0+voff,maxbmar);
1475 1 yy1 = min(yy1+voff,maxbmar);
1476 1 yy0 = max(yy0,0);
1477 1 yy1 = max(yy1,0);
1478 1 if (xx0 > 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);
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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
------------
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CC/DEB/LIS DVI2LN3
