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[mandoc.git] / term.c
1 /* $Id: term.c,v 1.276 2018/10/25 01:32:41 schwarze Exp $ */
2 /*
3 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
4 * Copyright (c) 2010-2018 Ingo Schwarze <schwarze@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18 #include "config.h"
19
20 #include <sys/types.h>
21
22 #include <assert.h>
23 #include <ctype.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27
28 #include "mandoc.h"
29 #include "mandoc_aux.h"
30 #include "out.h"
31 #include "term.h"
32 #include "main.h"
33
34 static size_t cond_width(const struct termp *, int, int *);
35 static void adjbuf(struct termp_col *, size_t);
36 static void bufferc(struct termp *, char);
37 static void encode(struct termp *, const char *, size_t);
38 static void encode1(struct termp *, int);
39 static void endline(struct termp *);
40
41
42 void
43 term_setcol(struct termp *p, size_t maxtcol)
44 {
45 if (maxtcol > p->maxtcol) {
46 p->tcols = mandoc_recallocarray(p->tcols,
47 p->maxtcol, maxtcol, sizeof(*p->tcols));
48 p->maxtcol = maxtcol;
49 }
50 p->lasttcol = maxtcol - 1;
51 p->tcol = p->tcols;
52 }
53
54 void
55 term_free(struct termp *p)
56 {
57 for (p->tcol = p->tcols; p->tcol < p->tcols + p->maxtcol; p->tcol++)
58 free(p->tcol->buf);
59 free(p->tcols);
60 free(p->fontq);
61 free(p);
62 }
63
64 void
65 term_begin(struct termp *p, term_margin head,
66 term_margin foot, const struct roff_meta *arg)
67 {
68
69 p->headf = head;
70 p->footf = foot;
71 p->argf = arg;
72 (*p->begin)(p);
73 }
74
75 void
76 term_end(struct termp *p)
77 {
78
79 (*p->end)(p);
80 }
81
82 /*
83 * Flush a chunk of text. By default, break the output line each time
84 * the right margin is reached, and continue output on the next line
85 * at the same offset as the chunk itself. By default, also break the
86 * output line at the end of the chunk.
87 * The following flags may be specified:
88 *
89 * - TERMP_NOBREAK: Do not break the output line at the right margin,
90 * but only at the max right margin. Also, do not break the output
91 * line at the end of the chunk, such that the next call can pad to
92 * the next column. However, if less than p->trailspace blanks,
93 * which can be 0, 1, or 2, remain to the right margin, the line
94 * will be broken.
95 * - TERMP_BRTRSP: Consider trailing whitespace significant
96 * when deciding whether the chunk fits or not.
97 * - TERMP_BRIND: If the chunk does not fit and the output line has
98 * to be broken, start the next line at the right margin instead
99 * of at the offset. Used together with TERMP_NOBREAK for the tags
100 * in various kinds of tagged lists.
101 * - TERMP_HANG: Do not break the output line at the right margin,
102 * append the next chunk after it even if this one is too long.
103 * To be used together with TERMP_NOBREAK.
104 * - TERMP_NOPAD: Start writing at the current position,
105 * do not pad with blank characters up to the offset.
106 */
107 void
108 term_flushln(struct termp *p)
109 {
110 size_t vis; /* current visual position on output */
111 size_t vbl; /* number of blanks to prepend to output */
112 size_t vend; /* end of word visual position on output */
113 size_t bp; /* visual right border position */
114 size_t dv; /* temporary for visual pos calculations */
115 size_t j; /* temporary loop index for p->tcol->buf */
116 size_t jhy; /* last hyph before overflow w/r/t j */
117 size_t maxvis; /* output position of visible boundary */
118 int ntab; /* number of tabs to prepend */
119 int breakline; /* after this word */
120
121 vbl = (p->flags & TERMP_NOPAD) || p->tcol->offset < p->viscol ?
122 0 : p->tcol->offset - p->viscol;
123 if (p->minbl && vbl < p->minbl)
124 vbl = p->minbl;
125 maxvis = p->tcol->rmargin > p->viscol + vbl ?
126 p->tcol->rmargin - p->viscol - vbl : 0;
127 bp = !(p->flags & TERMP_NOBREAK) ? maxvis :
128 p->maxrmargin > p->viscol + vbl ?
129 p->maxrmargin - p->viscol - vbl : 0;
130 vis = vend = 0;
131
132 if ((p->flags & TERMP_MULTICOL) == 0)
133 p->tcol->col = 0;
134 while (p->tcol->col < p->tcol->lastcol) {
135
136 /*
137 * Handle literal tab characters: collapse all
138 * subsequent tabs into a single huge set of spaces.
139 */
140
141 ntab = 0;
142 while (p->tcol->col < p->tcol->lastcol &&
143 p->tcol->buf[p->tcol->col] == '\t') {
144 vend = term_tab_next(vis);
145 vbl += vend - vis;
146 vis = vend;
147 ntab++;
148 p->tcol->col++;
149 }
150
151 /*
152 * Count up visible word characters. Control sequences
153 * (starting with the CSI) aren't counted. A space
154 * generates a non-printing word, which is valid (the
155 * space is printed according to regular spacing rules).
156 */
157
158 jhy = 0;
159 breakline = 0;
160 for (j = p->tcol->col; j < p->tcol->lastcol; j++) {
161 if (p->tcol->buf[j] == '\n') {
162 if ((p->flags & TERMP_BRIND) == 0)
163 breakline = 1;
164 continue;
165 }
166 if (p->tcol->buf[j] == ' ' || p->tcol->buf[j] == '\t')
167 break;
168
169 /* Back over the last printed character. */
170 if (p->tcol->buf[j] == '\b') {
171 assert(j);
172 vend -= (*p->width)(p, p->tcol->buf[j - 1]);
173 continue;
174 }
175
176 /* Regular word. */
177 /* Break at the hyphen point if we overrun. */
178 if (vend > vis && vend < bp &&
179 (p->tcol->buf[j] == ASCII_HYPH||
180 p->tcol->buf[j] == ASCII_BREAK))
181 jhy = j;
182
183 /*
184 * Hyphenation now decided, put back a real
185 * hyphen such that we get the correct width.
186 */
187 if (p->tcol->buf[j] == ASCII_HYPH)
188 p->tcol->buf[j] = '-';
189
190 vend += (*p->width)(p, p->tcol->buf[j]);
191 }
192
193 /*
194 * Find out whether we would exceed the right margin.
195 * If so, break to the next line.
196 */
197
198 if (vend > bp && jhy == 0 && vis > 0 &&
199 (p->flags & TERMP_BRNEVER) == 0) {
200 if (p->flags & TERMP_MULTICOL)
201 return;
202
203 endline(p);
204 vend -= vis;
205
206 /* Use pending tabs on the new line. */
207
208 vbl = 0;
209 while (ntab--)
210 vbl = term_tab_next(vbl);
211
212 /* Re-establish indentation. */
213
214 if (p->flags & TERMP_BRIND)
215 vbl += p->tcol->rmargin;
216 else
217 vbl += p->tcol->offset;
218 maxvis = p->tcol->rmargin > vbl ?
219 p->tcol->rmargin - vbl : 0;
220 bp = !(p->flags & TERMP_NOBREAK) ? maxvis :
221 p->maxrmargin > vbl ? p->maxrmargin - vbl : 0;
222 }
223
224 /*
225 * Write out the rest of the word.
226 */
227
228 for ( ; p->tcol->col < p->tcol->lastcol; p->tcol->col++) {
229 if (vend > bp && jhy > 0 && p->tcol->col > jhy)
230 break;
231 if (p->tcol->buf[p->tcol->col] == '\n')
232 continue;
233 if (p->tcol->buf[p->tcol->col] == '\t')
234 break;
235 if (p->tcol->buf[p->tcol->col] == ' ') {
236 j = p->tcol->col;
237 while (p->tcol->col < p->tcol->lastcol &&
238 p->tcol->buf[p->tcol->col] == ' ')
239 p->tcol->col++;
240 dv = (p->tcol->col - j) * (*p->width)(p, ' ');
241 vbl += dv;
242 vend += dv;
243 break;
244 }
245 if (p->tcol->buf[p->tcol->col] == ASCII_NBRSP) {
246 vbl += (*p->width)(p, ' ');
247 continue;
248 }
249 if (p->tcol->buf[p->tcol->col] == ASCII_BREAK)
250 continue;
251
252 /*
253 * Now we definitely know there will be
254 * printable characters to output,
255 * so write preceding white space now.
256 */
257 if (vbl) {
258 (*p->advance)(p, vbl);
259 p->viscol += vbl;
260 vbl = 0;
261 }
262
263 (*p->letter)(p, p->tcol->buf[p->tcol->col]);
264 if (p->tcol->buf[p->tcol->col] == '\b')
265 p->viscol -= (*p->width)(p,
266 p->tcol->buf[p->tcol->col - 1]);
267 else
268 p->viscol += (*p->width)(p,
269 p->tcol->buf[p->tcol->col]);
270 }
271 vis = vend;
272
273 if (breakline == 0)
274 continue;
275
276 /* Explicitly requested output line break. */
277
278 if (p->flags & TERMP_MULTICOL)
279 return;
280
281 endline(p);
282 breakline = 0;
283 vis = vend = 0;
284
285 /* Re-establish indentation. */
286
287 vbl = p->tcol->offset;
288 maxvis = p->tcol->rmargin > vbl ?
289 p->tcol->rmargin - vbl : 0;
290 bp = !(p->flags & TERMP_NOBREAK) ? maxvis :
291 p->maxrmargin > vbl ? p->maxrmargin - vbl : 0;
292 }
293
294 /*
295 * If there was trailing white space, it was not printed;
296 * so reset the cursor position accordingly.
297 */
298
299 if (vis > vbl)
300 vis -= vbl;
301 else
302 vis = 0;
303
304 p->col = p->tcol->col = p->tcol->lastcol = 0;
305 p->minbl = p->trailspace;
306 p->flags &= ~(TERMP_BACKAFTER | TERMP_BACKBEFORE | TERMP_NOPAD);
307
308 if (p->flags & TERMP_MULTICOL)
309 return;
310
311 /* Trailing whitespace is significant in some columns. */
312
313 if (vis && vbl && (TERMP_BRTRSP & p->flags))
314 vis += vbl;
315
316 /* If the column was overrun, break the line. */
317 if ((p->flags & TERMP_NOBREAK) == 0 ||
318 ((p->flags & TERMP_HANG) == 0 &&
319 vis + p->trailspace * (*p->width)(p, ' ') > maxvis))
320 endline(p);
321 }
322
323 static void
324 endline(struct termp *p)
325 {
326 if ((p->flags & (TERMP_NEWMC | TERMP_ENDMC)) == TERMP_ENDMC) {
327 p->mc = NULL;
328 p->flags &= ~TERMP_ENDMC;
329 }
330 if (p->mc != NULL) {
331 if (p->viscol && p->maxrmargin >= p->viscol)
332 (*p->advance)(p, p->maxrmargin - p->viscol + 1);
333 p->flags |= TERMP_NOBUF | TERMP_NOSPACE;
334 term_word(p, p->mc);
335 p->flags &= ~(TERMP_NOBUF | TERMP_NEWMC);
336 }
337 p->viscol = 0;
338 p->minbl = 0;
339 (*p->endline)(p);
340 }
341
342 /*
343 * A newline only breaks an existing line; it won't assert vertical
344 * space. All data in the output buffer is flushed prior to the newline
345 * assertion.
346 */
347 void
348 term_newln(struct termp *p)
349 {
350
351 p->flags |= TERMP_NOSPACE;
352 if (p->tcol->lastcol || p->viscol)
353 term_flushln(p);
354 }
355
356 /*
357 * Asserts a vertical space (a full, empty line-break between lines).
358 * Note that if used twice, this will cause two blank spaces and so on.
359 * All data in the output buffer is flushed prior to the newline
360 * assertion.
361 */
362 void
363 term_vspace(struct termp *p)
364 {
365
366 term_newln(p);
367 p->viscol = 0;
368 p->minbl = 0;
369 if (0 < p->skipvsp)
370 p->skipvsp--;
371 else
372 (*p->endline)(p);
373 }
374
375 /* Swap current and previous font; for \fP and .ft P */
376 void
377 term_fontlast(struct termp *p)
378 {
379 enum termfont f;
380
381 f = p->fontl;
382 p->fontl = p->fontq[p->fonti];
383 p->fontq[p->fonti] = f;
384 }
385
386 /* Set font, save current, discard previous; for \f, .ft, .B etc. */
387 void
388 term_fontrepl(struct termp *p, enum termfont f)
389 {
390
391 p->fontl = p->fontq[p->fonti];
392 p->fontq[p->fonti] = f;
393 }
394
395 /* Set font, save previous. */
396 void
397 term_fontpush(struct termp *p, enum termfont f)
398 {
399
400 p->fontl = p->fontq[p->fonti];
401 if (++p->fonti == p->fontsz) {
402 p->fontsz += 8;
403 p->fontq = mandoc_reallocarray(p->fontq,
404 p->fontsz, sizeof(*p->fontq));
405 }
406 p->fontq[p->fonti] = f;
407 }
408
409 /* Flush to make the saved pointer current again. */
410 void
411 term_fontpopq(struct termp *p, int i)
412 {
413
414 assert(i >= 0);
415 if (p->fonti > i)
416 p->fonti = i;
417 }
418
419 /* Pop one font off the stack. */
420 void
421 term_fontpop(struct termp *p)
422 {
423
424 assert(p->fonti);
425 p->fonti--;
426 }
427
428 /*
429 * Handle pwords, partial words, which may be either a single word or a
430 * phrase that cannot be broken down (such as a literal string). This
431 * handles word styling.
432 */
433 void
434 term_word(struct termp *p, const char *word)
435 {
436 struct roffsu su;
437 const char nbrsp[2] = { ASCII_NBRSP, 0 };
438 const char *seq, *cp;
439 int sz, uc;
440 size_t csz, lsz, ssz;
441 enum mandoc_esc esc;
442
443 if ((p->flags & TERMP_NOBUF) == 0) {
444 if ((p->flags & TERMP_NOSPACE) == 0) {
445 if ((p->flags & TERMP_KEEP) == 0) {
446 bufferc(p, ' ');
447 if (p->flags & TERMP_SENTENCE)
448 bufferc(p, ' ');
449 } else
450 bufferc(p, ASCII_NBRSP);
451 }
452 if (p->flags & TERMP_PREKEEP)
453 p->flags |= TERMP_KEEP;
454 if (p->flags & TERMP_NONOSPACE)
455 p->flags |= TERMP_NOSPACE;
456 else
457 p->flags &= ~TERMP_NOSPACE;
458 p->flags &= ~(TERMP_SENTENCE | TERMP_NONEWLINE);
459 p->skipvsp = 0;
460 }
461
462 while ('\0' != *word) {
463 if ('\\' != *word) {
464 if (TERMP_NBRWORD & p->flags) {
465 if (' ' == *word) {
466 encode(p, nbrsp, 1);
467 word++;
468 continue;
469 }
470 ssz = strcspn(word, "\\ ");
471 } else
472 ssz = strcspn(word, "\\");
473 encode(p, word, ssz);
474 word += (int)ssz;
475 continue;
476 }
477
478 word++;
479 esc = mandoc_escape(&word, &seq, &sz);
480 if (ESCAPE_ERROR == esc)
481 continue;
482
483 switch (esc) {
484 case ESCAPE_UNICODE:
485 uc = mchars_num2uc(seq + 1, sz - 1);
486 break;
487 case ESCAPE_NUMBERED:
488 uc = mchars_num2char(seq, sz);
489 if (uc < 0)
490 continue;
491 break;
492 case ESCAPE_SPECIAL:
493 if (p->enc == TERMENC_ASCII) {
494 cp = mchars_spec2str(seq, sz, &ssz);
495 if (cp != NULL)
496 encode(p, cp, ssz);
497 } else {
498 uc = mchars_spec2cp(seq, sz);
499 if (uc > 0)
500 encode1(p, uc);
501 }
502 continue;
503 case ESCAPE_FONTBOLD:
504 term_fontrepl(p, TERMFONT_BOLD);
505 continue;
506 case ESCAPE_FONTITALIC:
507 term_fontrepl(p, TERMFONT_UNDER);
508 continue;
509 case ESCAPE_FONTBI:
510 term_fontrepl(p, TERMFONT_BI);
511 continue;
512 case ESCAPE_FONT:
513 case ESCAPE_FONTCW:
514 case ESCAPE_FONTROMAN:
515 term_fontrepl(p, TERMFONT_NONE);
516 continue;
517 case ESCAPE_FONTPREV:
518 term_fontlast(p);
519 continue;
520 case ESCAPE_BREAK:
521 bufferc(p, '\n');
522 continue;
523 case ESCAPE_NOSPACE:
524 if (p->flags & TERMP_BACKAFTER)
525 p->flags &= ~TERMP_BACKAFTER;
526 else if (*word == '\0')
527 p->flags |= (TERMP_NOSPACE | TERMP_NONEWLINE);
528 continue;
529 case ESCAPE_DEVICE:
530 if (p->type == TERMTYPE_PDF)
531 encode(p, "pdf", 3);
532 else if (p->type == TERMTYPE_PS)
533 encode(p, "ps", 2);
534 else if (p->enc == TERMENC_ASCII)
535 encode(p, "ascii", 5);
536 else
537 encode(p, "utf8", 4);
538 continue;
539 case ESCAPE_HORIZ:
540 if (*seq == '|') {
541 seq++;
542 uc = -p->col;
543 } else
544 uc = 0;
545 if (a2roffsu(seq, &su, SCALE_EM) == NULL)
546 continue;
547 uc += term_hen(p, &su);
548 if (uc > 0)
549 while (uc-- > 0)
550 bufferc(p, ASCII_NBRSP);
551 else if (p->col > (size_t)(-uc))
552 p->col += uc;
553 else {
554 uc += p->col;
555 p->col = 0;
556 if (p->tcol->offset > (size_t)(-uc)) {
557 p->ti += uc;
558 p->tcol->offset += uc;
559 } else {
560 p->ti -= p->tcol->offset;
561 p->tcol->offset = 0;
562 }
563 }
564 continue;
565 case ESCAPE_HLINE:
566 if ((cp = a2roffsu(seq, &su, SCALE_EM)) == NULL)
567 continue;
568 uc = term_hen(p, &su);
569 if (uc <= 0) {
570 if (p->tcol->rmargin <= p->tcol->offset)
571 continue;
572 lsz = p->tcol->rmargin - p->tcol->offset;
573 } else
574 lsz = uc;
575 if (*cp == seq[-1])
576 uc = -1;
577 else if (*cp == '\\') {
578 seq = cp + 1;
579 esc = mandoc_escape(&seq, &cp, &sz);
580 switch (esc) {
581 case ESCAPE_UNICODE:
582 uc = mchars_num2uc(cp + 1, sz - 1);
583 break;
584 case ESCAPE_NUMBERED:
585 uc = mchars_num2char(cp, sz);
586 break;
587 case ESCAPE_SPECIAL:
588 uc = mchars_spec2cp(cp, sz);
589 break;
590 default:
591 uc = -1;
592 break;
593 }
594 } else
595 uc = *cp;
596 if (uc < 0x20 || (uc > 0x7E && uc < 0xA0))
597 uc = '_';
598 if (p->enc == TERMENC_ASCII) {
599 cp = ascii_uc2str(uc);
600 csz = term_strlen(p, cp);
601 ssz = strlen(cp);
602 } else
603 csz = (*p->width)(p, uc);
604 while (lsz >= csz) {
605 if (p->enc == TERMENC_ASCII)
606 encode(p, cp, ssz);
607 else
608 encode1(p, uc);
609 lsz -= csz;
610 }
611 continue;
612 case ESCAPE_SKIPCHAR:
613 p->flags |= TERMP_BACKAFTER;
614 continue;
615 case ESCAPE_OVERSTRIKE:
616 cp = seq + sz;
617 while (seq < cp) {
618 if (*seq == '\\') {
619 mandoc_escape(&seq, NULL, NULL);
620 continue;
621 }
622 encode1(p, *seq++);
623 if (seq < cp) {
624 if (p->flags & TERMP_BACKBEFORE)
625 p->flags |= TERMP_BACKAFTER;
626 else
627 p->flags |= TERMP_BACKBEFORE;
628 }
629 }
630 /* Trim trailing backspace/blank pair. */
631 if (p->tcol->lastcol > 2 &&
632 (p->tcol->buf[p->tcol->lastcol - 1] == ' ' ||
633 p->tcol->buf[p->tcol->lastcol - 1] == '\t'))
634 p->tcol->lastcol -= 2;
635 if (p->col > p->tcol->lastcol)
636 p->col = p->tcol->lastcol;
637 continue;
638 default:
639 continue;
640 }
641
642 /*
643 * Common handling for Unicode and numbered
644 * character escape sequences.
645 */
646
647 if (p->enc == TERMENC_ASCII) {
648 cp = ascii_uc2str(uc);
649 encode(p, cp, strlen(cp));
650 } else {
651 if ((uc < 0x20 && uc != 0x09) ||
652 (uc > 0x7E && uc < 0xA0))
653 uc = 0xFFFD;
654 encode1(p, uc);
655 }
656 }
657 p->flags &= ~TERMP_NBRWORD;
658 }
659
660 static void
661 adjbuf(struct termp_col *c, size_t sz)
662 {
663 if (c->maxcols == 0)
664 c->maxcols = 1024;
665 while (c->maxcols <= sz)
666 c->maxcols <<= 2;
667 c->buf = mandoc_reallocarray(c->buf, c->maxcols, sizeof(*c->buf));
668 }
669
670 static void
671 bufferc(struct termp *p, char c)
672 {
673 if (p->flags & TERMP_NOBUF) {
674 (*p->letter)(p, c);
675 return;
676 }
677 if (p->col + 1 >= p->tcol->maxcols)
678 adjbuf(p->tcol, p->col + 1);
679 if (p->tcol->lastcol <= p->col || (c != ' ' && c != ASCII_NBRSP))
680 p->tcol->buf[p->col] = c;
681 if (p->tcol->lastcol < ++p->col)
682 p->tcol->lastcol = p->col;
683 }
684
685 /*
686 * See encode().
687 * Do this for a single (probably unicode) value.
688 * Does not check for non-decorated glyphs.
689 */
690 static void
691 encode1(struct termp *p, int c)
692 {
693 enum termfont f;
694
695 if (p->flags & TERMP_NOBUF) {
696 (*p->letter)(p, c);
697 return;
698 }
699
700 if (p->col + 7 >= p->tcol->maxcols)
701 adjbuf(p->tcol, p->col + 7);
702
703 f = (c == ASCII_HYPH || c > 127 || isgraph(c)) ?
704 p->fontq[p->fonti] : TERMFONT_NONE;
705
706 if (p->flags & TERMP_BACKBEFORE) {
707 if (p->tcol->buf[p->col - 1] == ' ' ||
708 p->tcol->buf[p->col - 1] == '\t')
709 p->col--;
710 else
711 p->tcol->buf[p->col++] = '\b';
712 p->flags &= ~TERMP_BACKBEFORE;
713 }
714 if (f == TERMFONT_UNDER || f == TERMFONT_BI) {
715 p->tcol->buf[p->col++] = '_';
716 p->tcol->buf[p->col++] = '\b';
717 }
718 if (f == TERMFONT_BOLD || f == TERMFONT_BI) {
719 if (c == ASCII_HYPH)
720 p->tcol->buf[p->col++] = '-';
721 else
722 p->tcol->buf[p->col++] = c;
723 p->tcol->buf[p->col++] = '\b';
724 }
725 if (p->tcol->lastcol <= p->col || (c != ' ' && c != ASCII_NBRSP))
726 p->tcol->buf[p->col] = c;
727 if (p->tcol->lastcol < ++p->col)
728 p->tcol->lastcol = p->col;
729 if (p->flags & TERMP_BACKAFTER) {
730 p->flags |= TERMP_BACKBEFORE;
731 p->flags &= ~TERMP_BACKAFTER;
732 }
733 }
734
735 static void
736 encode(struct termp *p, const char *word, size_t sz)
737 {
738 size_t i;
739
740 if (p->flags & TERMP_NOBUF) {
741 for (i = 0; i < sz; i++)
742 (*p->letter)(p, word[i]);
743 return;
744 }
745
746 if (p->col + 2 + (sz * 5) >= p->tcol->maxcols)
747 adjbuf(p->tcol, p->col + 2 + (sz * 5));
748
749 for (i = 0; i < sz; i++) {
750 if (ASCII_HYPH == word[i] ||
751 isgraph((unsigned char)word[i]))
752 encode1(p, word[i]);
753 else {
754 if (p->tcol->lastcol <= p->col ||
755 (word[i] != ' ' && word[i] != ASCII_NBRSP))
756 p->tcol->buf[p->col] = word[i];
757 p->col++;
758
759 /*
760 * Postpone the effect of \z while handling
761 * an overstrike sequence from ascii_uc2str().
762 */
763
764 if (word[i] == '\b' &&
765 (p->flags & TERMP_BACKBEFORE)) {
766 p->flags &= ~TERMP_BACKBEFORE;
767 p->flags |= TERMP_BACKAFTER;
768 }
769 }
770 }
771 if (p->tcol->lastcol < p->col)
772 p->tcol->lastcol = p->col;
773 }
774
775 void
776 term_setwidth(struct termp *p, const char *wstr)
777 {
778 struct roffsu su;
779 int iop, width;
780
781 iop = 0;
782 width = 0;
783 if (NULL != wstr) {
784 switch (*wstr) {
785 case '+':
786 iop = 1;
787 wstr++;
788 break;
789 case '-':
790 iop = -1;
791 wstr++;
792 break;
793 default:
794 break;
795 }
796 if (a2roffsu(wstr, &su, SCALE_MAX) != NULL)
797 width = term_hspan(p, &su);
798 else
799 iop = 0;
800 }
801 (*p->setwidth)(p, iop, width);
802 }
803
804 size_t
805 term_len(const struct termp *p, size_t sz)
806 {
807
808 return (*p->width)(p, ' ') * sz;
809 }
810
811 static size_t
812 cond_width(const struct termp *p, int c, int *skip)
813 {
814
815 if (*skip) {
816 (*skip) = 0;
817 return 0;
818 } else
819 return (*p->width)(p, c);
820 }
821
822 size_t
823 term_strlen(const struct termp *p, const char *cp)
824 {
825 size_t sz, rsz, i;
826 int ssz, skip, uc;
827 const char *seq, *rhs;
828 enum mandoc_esc esc;
829 static const char rej[] = { '\\', ASCII_NBRSP, ASCII_HYPH,
830 ASCII_BREAK, '\0' };
831
832 /*
833 * Account for escaped sequences within string length
834 * calculations. This follows the logic in term_word() as we
835 * must calculate the width of produced strings.
836 */
837
838 sz = 0;
839 skip = 0;
840 while ('\0' != *cp) {
841 rsz = strcspn(cp, rej);
842 for (i = 0; i < rsz; i++)
843 sz += cond_width(p, *cp++, &skip);
844
845 switch (*cp) {
846 case '\\':
847 cp++;
848 esc = mandoc_escape(&cp, &seq, &ssz);
849 if (ESCAPE_ERROR == esc)
850 continue;
851
852 rhs = NULL;
853
854 switch (esc) {
855 case ESCAPE_UNICODE:
856 uc = mchars_num2uc(seq + 1, ssz - 1);
857 break;
858 case ESCAPE_NUMBERED:
859 uc = mchars_num2char(seq, ssz);
860 if (uc < 0)
861 continue;
862 break;
863 case ESCAPE_SPECIAL:
864 if (p->enc == TERMENC_ASCII) {
865 rhs = mchars_spec2str(seq, ssz, &rsz);
866 if (rhs != NULL)
867 break;
868 } else {
869 uc = mchars_spec2cp(seq, ssz);
870 if (uc > 0)
871 sz += cond_width(p, uc, &skip);
872 }
873 continue;
874 case ESCAPE_DEVICE:
875 if (p->type == TERMTYPE_PDF) {
876 rhs = "pdf";
877 rsz = 3;
878 } else if (p->type == TERMTYPE_PS) {
879 rhs = "ps";
880 rsz = 2;
881 } else if (p->enc == TERMENC_ASCII) {
882 rhs = "ascii";
883 rsz = 5;
884 } else {
885 rhs = "utf8";
886 rsz = 4;
887 }
888 break;
889 case ESCAPE_SKIPCHAR:
890 skip = 1;
891 continue;
892 case ESCAPE_OVERSTRIKE:
893 rsz = 0;
894 rhs = seq + ssz;
895 while (seq < rhs) {
896 if (*seq == '\\') {
897 mandoc_escape(&seq, NULL, NULL);
898 continue;
899 }
900 i = (*p->width)(p, *seq++);
901 if (rsz < i)
902 rsz = i;
903 }
904 sz += rsz;
905 continue;
906 default:
907 continue;
908 }
909
910 /*
911 * Common handling for Unicode and numbered
912 * character escape sequences.
913 */
914
915 if (rhs == NULL) {
916 if (p->enc == TERMENC_ASCII) {
917 rhs = ascii_uc2str(uc);
918 rsz = strlen(rhs);
919 } else {
920 if ((uc < 0x20 && uc != 0x09) ||
921 (uc > 0x7E && uc < 0xA0))
922 uc = 0xFFFD;
923 sz += cond_width(p, uc, &skip);
924 continue;
925 }
926 }
927
928 if (skip) {
929 skip = 0;
930 break;
931 }
932
933 /*
934 * Common handling for all escape sequences
935 * printing more than one character.
936 */
937
938 for (i = 0; i < rsz; i++)
939 sz += (*p->width)(p, *rhs++);
940 break;
941 case ASCII_NBRSP:
942 sz += cond_width(p, ' ', &skip);
943 cp++;
944 break;
945 case ASCII_HYPH:
946 sz += cond_width(p, '-', &skip);
947 cp++;
948 break;
949 default:
950 break;
951 }
952 }
953
954 return sz;
955 }
956
957 int
958 term_vspan(const struct termp *p, const struct roffsu *su)
959 {
960 double r;
961 int ri;
962
963 switch (su->unit) {
964 case SCALE_BU:
965 r = su->scale / 40.0;
966 break;
967 case SCALE_CM:
968 r = su->scale * 6.0 / 2.54;
969 break;
970 case SCALE_FS:
971 r = su->scale * 65536.0 / 40.0;
972 break;
973 case SCALE_IN:
974 r = su->scale * 6.0;
975 break;
976 case SCALE_MM:
977 r = su->scale * 0.006;
978 break;
979 case SCALE_PC:
980 r = su->scale;
981 break;
982 case SCALE_PT:
983 r = su->scale / 12.0;
984 break;
985 case SCALE_EN:
986 case SCALE_EM:
987 r = su->scale * 0.6;
988 break;
989 case SCALE_VS:
990 r = su->scale;
991 break;
992 default:
993 abort();
994 }
995 ri = r > 0.0 ? r + 0.4995 : r - 0.4995;
996 return ri < 66 ? ri : 1;
997 }
998
999 /*
1000 * Convert a scaling width to basic units, rounding towards 0.
1001 */
1002 int
1003 term_hspan(const struct termp *p, const struct roffsu *su)
1004 {
1005
1006 return (*p->hspan)(p, su);
1007 }
1008
1009 /*
1010 * Convert a scaling width to basic units, rounding to closest.
1011 */
1012 int
1013 term_hen(const struct termp *p, const struct roffsu *su)
1014 {
1015 int bu;
1016
1017 if ((bu = (*p->hspan)(p, su)) >= 0)
1018 return (bu + 11) / 24;
1019 else
1020 return -((-bu + 11) / 24);
1021 }
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