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[mandoc.git] / term.c
1 /* $Id: term.c,v 1.281 2019/06/03 20:23:41 schwarze Exp $ */
2 /*
3 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
4 * Copyright (c) 2010-2019 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 <stdint.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28
29 #include "mandoc.h"
30 #include "mandoc_aux.h"
31 #include "out.h"
32 #include "term.h"
33 #include "main.h"
34
35 static size_t cond_width(const struct termp *, int, int *);
36 static void adjbuf(struct termp_col *, size_t);
37 static void bufferc(struct termp *, char);
38 static void encode(struct termp *, const char *, size_t);
39 static void encode1(struct termp *, int);
40 static void endline(struct termp *);
41 static void term_field(struct termp *, size_t, size_t,
42 size_t, size_t);
43 static void term_fill(struct termp *, size_t *, size_t *,
44 size_t);
45
46
47 void
48 term_setcol(struct termp *p, size_t maxtcol)
49 {
50 if (maxtcol > p->maxtcol) {
51 p->tcols = mandoc_recallocarray(p->tcols,
52 p->maxtcol, maxtcol, sizeof(*p->tcols));
53 p->maxtcol = maxtcol;
54 }
55 p->lasttcol = maxtcol - 1;
56 p->tcol = p->tcols;
57 }
58
59 void
60 term_free(struct termp *p)
61 {
62 for (p->tcol = p->tcols; p->tcol < p->tcols + p->maxtcol; p->tcol++)
63 free(p->tcol->buf);
64 free(p->tcols);
65 free(p->fontq);
66 free(p);
67 }
68
69 void
70 term_begin(struct termp *p, term_margin head,
71 term_margin foot, const struct roff_meta *arg)
72 {
73
74 p->headf = head;
75 p->footf = foot;
76 p->argf = arg;
77 (*p->begin)(p);
78 }
79
80 void
81 term_end(struct termp *p)
82 {
83
84 (*p->end)(p);
85 }
86
87 /*
88 * Flush a chunk of text. By default, break the output line each time
89 * the right margin is reached, and continue output on the next line
90 * at the same offset as the chunk itself. By default, also break the
91 * output line at the end of the chunk. There are many flags modifying
92 * this behaviour, see the comments in the body of the function.
93 */
94 void
95 term_flushln(struct termp *p)
96 {
97 size_t vbl; /* Number of blanks to prepend to the output. */
98 size_t vbr; /* Actual visual position of the end of field. */
99 size_t vfield; /* Desired visual field width. */
100 size_t vtarget; /* Desired visual position of the right margin. */
101 size_t ic; /* Character position in the input buffer. */
102 size_t nbr; /* Number of characters to print in this field. */
103
104 /*
105 * Normally, start writing at the left margin, but with the
106 * NOPAD flag, start writing at the current position instead.
107 */
108
109 vbl = (p->flags & TERMP_NOPAD) || p->tcol->offset < p->viscol ?
110 0 : p->tcol->offset - p->viscol;
111 if (p->minbl && vbl < p->minbl)
112 vbl = p->minbl;
113
114 if ((p->flags & TERMP_MULTICOL) == 0)
115 p->tcol->col = 0;
116
117 /* Loop over output lines. */
118
119 for (;;) {
120 vfield = p->tcol->rmargin > p->viscol + vbl ?
121 p->tcol->rmargin - p->viscol - vbl : 0;
122
123 /*
124 * Normally, break the line at the the right margin
125 * of the field, but with the NOBREAK flag, only
126 * break it at the max right margin of the screen,
127 * and with the BRNEVER flag, never break it at all.
128 */
129
130 vtarget = p->flags & TERMP_BRNEVER ? SIZE_MAX :
131 (p->flags & TERMP_NOBREAK) == 0 ? vfield :
132 p->maxrmargin > p->viscol + vbl ?
133 p->maxrmargin - p->viscol - vbl : 0;
134
135 /*
136 * Figure out how much text will fit in the field.
137 * If there is whitespace only, print nothing.
138 */
139
140 term_fill(p, &nbr, &vbr, vtarget);
141 if (nbr == 0)
142 break;
143
144 /*
145 * With the CENTER or RIGHT flag, increase the indentation
146 * to center the text between the left and right margins
147 * or to adjust it to the right margin, respectively.
148 */
149
150 if (vbr < vtarget) {
151 if (p->flags & TERMP_CENTER)
152 vbl += (vtarget - vbr) / 2;
153 else if (p->flags & TERMP_RIGHT)
154 vbl += vtarget - vbr;
155 }
156
157 /* Finally, print the field content. */
158
159 term_field(p, vbl, nbr, vbr, vtarget);
160
161 /*
162 * If there is no text left in the field, exit the loop.
163 * If the BRTRSP flag is set, consider trailing
164 * whitespace significant when deciding whether
165 * the field fits or not.
166 */
167
168 for (ic = p->tcol->col; ic < p->tcol->lastcol; ic++) {
169 switch (p->tcol->buf[ic]) {
170 case '\t':
171 if (p->flags & TERMP_BRTRSP)
172 vbr = term_tab_next(vbr);
173 continue;
174 case ' ':
175 if (p->flags & TERMP_BRTRSP)
176 vbr += (*p->width)(p, ' ');
177 continue;
178 case '\n':
179 case ASCII_BREAK:
180 continue;
181 default:
182 break;
183 }
184 break;
185 }
186 if (ic == p->tcol->lastcol)
187 break;
188
189 /*
190 * At the location of an automtic line break, input
191 * space characters are consumed by the line break.
192 */
193
194 while (p->tcol->col < p->tcol->lastcol &&
195 p->tcol->buf[p->tcol->col] == ' ')
196 p->tcol->col++;
197
198 /*
199 * In multi-column mode, leave the rest of the text
200 * in the buffer to be handled by a subsequent
201 * invocation, such that the other columns of the
202 * table can be handled first.
203 * In single-column mode, simply break the line.
204 */
205
206 if (p->flags & TERMP_MULTICOL)
207 return;
208
209 endline(p);
210 p->viscol = 0;
211
212 /*
213 * Normally, start the next line at the same indentation
214 * as this one, but with the BRIND flag, start it at the
215 * right margin instead. This is used together with
216 * NOBREAK for the tags in various kinds of tagged lists.
217 */
218
219 vbl = p->flags & TERMP_BRIND ?
220 p->tcol->rmargin : p->tcol->offset;
221 }
222
223 /* Reset output state in preparation for the next field. */
224
225 p->col = p->tcol->col = p->tcol->lastcol = 0;
226 p->minbl = p->trailspace;
227 p->flags &= ~(TERMP_BACKAFTER | TERMP_BACKBEFORE | TERMP_NOPAD);
228
229 if (p->flags & TERMP_MULTICOL)
230 return;
231
232 /*
233 * The HANG flag means that the next field
234 * always follows on the same line.
235 * The NOBREAK flag means that the next field
236 * follows on the same line unless the field was overrun.
237 * Normally, break the line at the end of each field.
238 */
239
240 if ((p->flags & TERMP_HANG) == 0 &&
241 ((p->flags & TERMP_NOBREAK) == 0 ||
242 vbr + term_len(p, p->trailspace) > vfield))
243 endline(p);
244 }
245
246 /*
247 * Store the number of input characters to print in this field in *nbr
248 * and their total visual width to print in *vbr.
249 * If there is only whitespace in the field, both remain zero.
250 * The desired visual width of the field is provided by vtarget.
251 * If the first word is longer, the field will be overrun.
252 */
253 static void
254 term_fill(struct termp *p, size_t *nbr, size_t *vbr, size_t vtarget)
255 {
256 size_t ic; /* Character position in the input buffer. */
257 size_t vis; /* Visual position of the current character. */
258 size_t vn; /* Visual position of the next character. */
259 int breakline; /* Break at the end of this word. */
260 int graph; /* Last character was non-blank. */
261
262 *nbr = *vbr = vis = 0;
263 breakline = graph = 0;
264 for (ic = p->tcol->col; ic < p->tcol->lastcol; ic++) {
265 switch (p->tcol->buf[ic]) {
266 case '\b': /* Escape \o (overstrike) or backspace markup. */
267 assert(ic > 0);
268 vis -= (*p->width)(p, p->tcol->buf[ic - 1]);
269 continue;
270
271 case '\t': /* Normal ASCII whitespace. */
272 case ' ':
273 case ASCII_BREAK: /* Escape \: (breakpoint). */
274 switch (p->tcol->buf[ic]) {
275 case '\t':
276 vn = term_tab_next(vis);
277 break;
278 case ' ':
279 vn = vis + (*p->width)(p, ' ');
280 break;
281 case ASCII_BREAK:
282 vn = vis;
283 break;
284 default:
285 abort();
286 }
287 /* Can break at the end of a word. */
288 if (breakline || vn > vtarget)
289 break;
290 if (graph) {
291 *nbr = ic;
292 *vbr = vis;
293 graph = 0;
294 }
295 vis = vn;
296 continue;
297
298 case '\n': /* Escape \p (break at the end of the word). */
299 breakline = 1;
300 continue;
301
302 case ASCII_HYPH: /* Breakable hyphen. */
303 graph = 1;
304 /*
305 * We are about to decide whether to break the
306 * line or not, so we no longer need this hyphen
307 * to be marked as breakable. Put back a real
308 * hyphen such that we get the correct width.
309 */
310 p->tcol->buf[ic] = '-';
311 vis += (*p->width)(p, '-');
312 if (vis > vtarget) {
313 ic++;
314 break;
315 }
316 *nbr = ic + 1;
317 *vbr = vis;
318 continue;
319
320 case ASCII_NBRSP: /* Non-breakable space. */
321 p->tcol->buf[ic] = ' ';
322 /* FALLTHROUGH */
323 default: /* Printable character. */
324 graph = 1;
325 vis += (*p->width)(p, p->tcol->buf[ic]);
326 if (vis > vtarget && *nbr > 0)
327 return;
328 continue;
329 }
330 break;
331 }
332
333 /*
334 * If the last word extends to the end of the field without any
335 * trailing whitespace, the loop could not check yet whether it
336 * can remain on this line. So do the check now.
337 */
338
339 if (graph && (vis <= vtarget || *nbr == 0)) {
340 *nbr = ic;
341 *vbr = vis;
342 }
343 }
344
345 /*
346 * Print the contents of one field
347 * with an indentation of vbl visual columns,
348 * an input string length of nbr characters,
349 * an output width of vbr visual columns,
350 * and a desired field width of vtarget visual columns.
351 */
352 static void
353 term_field(struct termp *p, size_t vbl, size_t nbr, size_t vbr, size_t vtarget)
354 {
355 size_t ic; /* Character position in the input buffer. */
356 size_t vis; /* Visual position of the current character. */
357 size_t dv; /* Visual width of the current character. */
358 size_t vn; /* Visual position of the next character. */
359
360 vis = 0;
361 for (ic = p->tcol->col; ic < nbr; ic++) {
362
363 /*
364 * To avoid the printing of trailing whitespace,
365 * do not print whitespace right away, only count it.
366 */
367
368 switch (p->tcol->buf[ic]) {
369 case '\n':
370 case ASCII_BREAK:
371 continue;
372 case '\t':
373 vn = term_tab_next(vis);
374 vbl += vn - vis;
375 vis = vn;
376 continue;
377 case ' ':
378 case ASCII_NBRSP:
379 dv = (*p->width)(p, ' ');
380 vbl += dv;
381 vis += dv;
382 continue;
383 default:
384 break;
385 }
386
387 /*
388 * We found a non-blank character to print,
389 * so write preceding white space now.
390 */
391
392 if (vbl > 0) {
393 (*p->advance)(p, vbl);
394 p->viscol += vbl;
395 vbl = 0;
396 }
397
398 /* Print the character and adjust the visual position. */
399
400 (*p->letter)(p, p->tcol->buf[ic]);
401 if (p->tcol->buf[ic] == '\b') {
402 dv = (*p->width)(p, p->tcol->buf[ic - 1]);
403 p->viscol -= dv;
404 vis -= dv;
405 } else {
406 dv = (*p->width)(p, p->tcol->buf[ic]);
407 p->viscol += dv;
408 vis += dv;
409 }
410 }
411 p->tcol->col = nbr;
412 }
413
414 static void
415 endline(struct termp *p)
416 {
417 if ((p->flags & (TERMP_NEWMC | TERMP_ENDMC)) == TERMP_ENDMC) {
418 p->mc = NULL;
419 p->flags &= ~TERMP_ENDMC;
420 }
421 if (p->mc != NULL) {
422 if (p->viscol && p->maxrmargin >= p->viscol)
423 (*p->advance)(p, p->maxrmargin - p->viscol + 1);
424 p->flags |= TERMP_NOBUF | TERMP_NOSPACE;
425 term_word(p, p->mc);
426 p->flags &= ~(TERMP_NOBUF | TERMP_NEWMC);
427 }
428 p->viscol = 0;
429 p->minbl = 0;
430 (*p->endline)(p);
431 }
432
433 /*
434 * A newline only breaks an existing line; it won't assert vertical
435 * space. All data in the output buffer is flushed prior to the newline
436 * assertion.
437 */
438 void
439 term_newln(struct termp *p)
440 {
441
442 p->flags |= TERMP_NOSPACE;
443 if (p->tcol->lastcol || p->viscol)
444 term_flushln(p);
445 }
446
447 /*
448 * Asserts a vertical space (a full, empty line-break between lines).
449 * Note that if used twice, this will cause two blank spaces and so on.
450 * All data in the output buffer is flushed prior to the newline
451 * assertion.
452 */
453 void
454 term_vspace(struct termp *p)
455 {
456
457 term_newln(p);
458 p->viscol = 0;
459 p->minbl = 0;
460 if (0 < p->skipvsp)
461 p->skipvsp--;
462 else
463 (*p->endline)(p);
464 }
465
466 /* Swap current and previous font; for \fP and .ft P */
467 void
468 term_fontlast(struct termp *p)
469 {
470 enum termfont f;
471
472 f = p->fontl;
473 p->fontl = p->fontq[p->fonti];
474 p->fontq[p->fonti] = f;
475 }
476
477 /* Set font, save current, discard previous; for \f, .ft, .B etc. */
478 void
479 term_fontrepl(struct termp *p, enum termfont f)
480 {
481
482 p->fontl = p->fontq[p->fonti];
483 p->fontq[p->fonti] = f;
484 }
485
486 /* Set font, save previous. */
487 void
488 term_fontpush(struct termp *p, enum termfont f)
489 {
490
491 p->fontl = p->fontq[p->fonti];
492 if (++p->fonti == p->fontsz) {
493 p->fontsz += 8;
494 p->fontq = mandoc_reallocarray(p->fontq,
495 p->fontsz, sizeof(*p->fontq));
496 }
497 p->fontq[p->fonti] = f;
498 }
499
500 /* Flush to make the saved pointer current again. */
501 void
502 term_fontpopq(struct termp *p, int i)
503 {
504
505 assert(i >= 0);
506 if (p->fonti > i)
507 p->fonti = i;
508 }
509
510 /* Pop one font off the stack. */
511 void
512 term_fontpop(struct termp *p)
513 {
514
515 assert(p->fonti);
516 p->fonti--;
517 }
518
519 /*
520 * Handle pwords, partial words, which may be either a single word or a
521 * phrase that cannot be broken down (such as a literal string). This
522 * handles word styling.
523 */
524 void
525 term_word(struct termp *p, const char *word)
526 {
527 struct roffsu su;
528 const char nbrsp[2] = { ASCII_NBRSP, 0 };
529 const char *seq, *cp;
530 int sz, uc;
531 size_t csz, lsz, ssz;
532 enum mandoc_esc esc;
533
534 if ((p->flags & TERMP_NOBUF) == 0) {
535 if ((p->flags & TERMP_NOSPACE) == 0) {
536 if ((p->flags & TERMP_KEEP) == 0) {
537 bufferc(p, ' ');
538 if (p->flags & TERMP_SENTENCE)
539 bufferc(p, ' ');
540 } else
541 bufferc(p, ASCII_NBRSP);
542 }
543 if (p->flags & TERMP_PREKEEP)
544 p->flags |= TERMP_KEEP;
545 if (p->flags & TERMP_NONOSPACE)
546 p->flags |= TERMP_NOSPACE;
547 else
548 p->flags &= ~TERMP_NOSPACE;
549 p->flags &= ~(TERMP_SENTENCE | TERMP_NONEWLINE);
550 p->skipvsp = 0;
551 }
552
553 while ('\0' != *word) {
554 if ('\\' != *word) {
555 if (TERMP_NBRWORD & p->flags) {
556 if (' ' == *word) {
557 encode(p, nbrsp, 1);
558 word++;
559 continue;
560 }
561 ssz = strcspn(word, "\\ ");
562 } else
563 ssz = strcspn(word, "\\");
564 encode(p, word, ssz);
565 word += (int)ssz;
566 continue;
567 }
568
569 word++;
570 esc = mandoc_escape(&word, &seq, &sz);
571 switch (esc) {
572 case ESCAPE_UNICODE:
573 uc = mchars_num2uc(seq + 1, sz - 1);
574 break;
575 case ESCAPE_NUMBERED:
576 uc = mchars_num2char(seq, sz);
577 if (uc < 0)
578 continue;
579 break;
580 case ESCAPE_SPECIAL:
581 if (p->enc == TERMENC_ASCII) {
582 cp = mchars_spec2str(seq, sz, &ssz);
583 if (cp != NULL)
584 encode(p, cp, ssz);
585 } else {
586 uc = mchars_spec2cp(seq, sz);
587 if (uc > 0)
588 encode1(p, uc);
589 }
590 continue;
591 case ESCAPE_UNDEF:
592 uc = *seq;
593 break;
594 case ESCAPE_FONTBOLD:
595 term_fontrepl(p, TERMFONT_BOLD);
596 continue;
597 case ESCAPE_FONTITALIC:
598 term_fontrepl(p, TERMFONT_UNDER);
599 continue;
600 case ESCAPE_FONTBI:
601 term_fontrepl(p, TERMFONT_BI);
602 continue;
603 case ESCAPE_FONT:
604 case ESCAPE_FONTCW:
605 case ESCAPE_FONTROMAN:
606 term_fontrepl(p, TERMFONT_NONE);
607 continue;
608 case ESCAPE_FONTPREV:
609 term_fontlast(p);
610 continue;
611 case ESCAPE_BREAK:
612 bufferc(p, '\n');
613 continue;
614 case ESCAPE_NOSPACE:
615 if (p->flags & TERMP_BACKAFTER)
616 p->flags &= ~TERMP_BACKAFTER;
617 else if (*word == '\0')
618 p->flags |= (TERMP_NOSPACE | TERMP_NONEWLINE);
619 continue;
620 case ESCAPE_DEVICE:
621 if (p->type == TERMTYPE_PDF)
622 encode(p, "pdf", 3);
623 else if (p->type == TERMTYPE_PS)
624 encode(p, "ps", 2);
625 else if (p->enc == TERMENC_ASCII)
626 encode(p, "ascii", 5);
627 else
628 encode(p, "utf8", 4);
629 continue;
630 case ESCAPE_HORIZ:
631 if (*seq == '|') {
632 seq++;
633 uc = -p->col;
634 } else
635 uc = 0;
636 if (a2roffsu(seq, &su, SCALE_EM) == NULL)
637 continue;
638 uc += term_hen(p, &su);
639 if (uc > 0)
640 while (uc-- > 0)
641 bufferc(p, ASCII_NBRSP);
642 else if (p->col > (size_t)(-uc))
643 p->col += uc;
644 else {
645 uc += p->col;
646 p->col = 0;
647 if (p->tcol->offset > (size_t)(-uc)) {
648 p->ti += uc;
649 p->tcol->offset += uc;
650 } else {
651 p->ti -= p->tcol->offset;
652 p->tcol->offset = 0;
653 }
654 }
655 continue;
656 case ESCAPE_HLINE:
657 if ((cp = a2roffsu(seq, &su, SCALE_EM)) == NULL)
658 continue;
659 uc = term_hen(p, &su);
660 if (uc <= 0) {
661 if (p->tcol->rmargin <= p->tcol->offset)
662 continue;
663 lsz = p->tcol->rmargin - p->tcol->offset;
664 } else
665 lsz = uc;
666 if (*cp == seq[-1])
667 uc = -1;
668 else if (*cp == '\\') {
669 seq = cp + 1;
670 esc = mandoc_escape(&seq, &cp, &sz);
671 switch (esc) {
672 case ESCAPE_UNICODE:
673 uc = mchars_num2uc(cp + 1, sz - 1);
674 break;
675 case ESCAPE_NUMBERED:
676 uc = mchars_num2char(cp, sz);
677 break;
678 case ESCAPE_SPECIAL:
679 uc = mchars_spec2cp(cp, sz);
680 break;
681 case ESCAPE_UNDEF:
682 uc = *seq;
683 break;
684 default:
685 uc = -1;
686 break;
687 }
688 } else
689 uc = *cp;
690 if (uc < 0x20 || (uc > 0x7E && uc < 0xA0))
691 uc = '_';
692 if (p->enc == TERMENC_ASCII) {
693 cp = ascii_uc2str(uc);
694 csz = term_strlen(p, cp);
695 ssz = strlen(cp);
696 } else
697 csz = (*p->width)(p, uc);
698 while (lsz >= csz) {
699 if (p->enc == TERMENC_ASCII)
700 encode(p, cp, ssz);
701 else
702 encode1(p, uc);
703 lsz -= csz;
704 }
705 continue;
706 case ESCAPE_SKIPCHAR:
707 p->flags |= TERMP_BACKAFTER;
708 continue;
709 case ESCAPE_OVERSTRIKE:
710 cp = seq + sz;
711 while (seq < cp) {
712 if (*seq == '\\') {
713 mandoc_escape(&seq, NULL, NULL);
714 continue;
715 }
716 encode1(p, *seq++);
717 if (seq < cp) {
718 if (p->flags & TERMP_BACKBEFORE)
719 p->flags |= TERMP_BACKAFTER;
720 else
721 p->flags |= TERMP_BACKBEFORE;
722 }
723 }
724 /* Trim trailing backspace/blank pair. */
725 if (p->tcol->lastcol > 2 &&
726 (p->tcol->buf[p->tcol->lastcol - 1] == ' ' ||
727 p->tcol->buf[p->tcol->lastcol - 1] == '\t'))
728 p->tcol->lastcol -= 2;
729 if (p->col > p->tcol->lastcol)
730 p->col = p->tcol->lastcol;
731 continue;
732 default:
733 continue;
734 }
735
736 /*
737 * Common handling for Unicode and numbered
738 * character escape sequences.
739 */
740
741 if (p->enc == TERMENC_ASCII) {
742 cp = ascii_uc2str(uc);
743 encode(p, cp, strlen(cp));
744 } else {
745 if ((uc < 0x20 && uc != 0x09) ||
746 (uc > 0x7E && uc < 0xA0))
747 uc = 0xFFFD;
748 encode1(p, uc);
749 }
750 }
751 p->flags &= ~TERMP_NBRWORD;
752 }
753
754 static void
755 adjbuf(struct termp_col *c, size_t sz)
756 {
757 if (c->maxcols == 0)
758 c->maxcols = 1024;
759 while (c->maxcols <= sz)
760 c->maxcols <<= 2;
761 c->buf = mandoc_reallocarray(c->buf, c->maxcols, sizeof(*c->buf));
762 }
763
764 static void
765 bufferc(struct termp *p, char c)
766 {
767 if (p->flags & TERMP_NOBUF) {
768 (*p->letter)(p, c);
769 return;
770 }
771 if (p->col + 1 >= p->tcol->maxcols)
772 adjbuf(p->tcol, p->col + 1);
773 if (p->tcol->lastcol <= p->col || (c != ' ' && c != ASCII_NBRSP))
774 p->tcol->buf[p->col] = c;
775 if (p->tcol->lastcol < ++p->col)
776 p->tcol->lastcol = p->col;
777 }
778
779 /*
780 * See encode().
781 * Do this for a single (probably unicode) value.
782 * Does not check for non-decorated glyphs.
783 */
784 static void
785 encode1(struct termp *p, int c)
786 {
787 enum termfont f;
788
789 if (p->flags & TERMP_NOBUF) {
790 (*p->letter)(p, c);
791 return;
792 }
793
794 if (p->col + 7 >= p->tcol->maxcols)
795 adjbuf(p->tcol, p->col + 7);
796
797 f = (c == ASCII_HYPH || c > 127 || isgraph(c)) ?
798 p->fontq[p->fonti] : TERMFONT_NONE;
799
800 if (p->flags & TERMP_BACKBEFORE) {
801 if (p->tcol->buf[p->col - 1] == ' ' ||
802 p->tcol->buf[p->col - 1] == '\t')
803 p->col--;
804 else
805 p->tcol->buf[p->col++] = '\b';
806 p->flags &= ~TERMP_BACKBEFORE;
807 }
808 if (f == TERMFONT_UNDER || f == TERMFONT_BI) {
809 p->tcol->buf[p->col++] = '_';
810 p->tcol->buf[p->col++] = '\b';
811 }
812 if (f == TERMFONT_BOLD || f == TERMFONT_BI) {
813 if (c == ASCII_HYPH)
814 p->tcol->buf[p->col++] = '-';
815 else
816 p->tcol->buf[p->col++] = c;
817 p->tcol->buf[p->col++] = '\b';
818 }
819 if (p->tcol->lastcol <= p->col || (c != ' ' && c != ASCII_NBRSP))
820 p->tcol->buf[p->col] = c;
821 if (p->tcol->lastcol < ++p->col)
822 p->tcol->lastcol = p->col;
823 if (p->flags & TERMP_BACKAFTER) {
824 p->flags |= TERMP_BACKBEFORE;
825 p->flags &= ~TERMP_BACKAFTER;
826 }
827 }
828
829 static void
830 encode(struct termp *p, const char *word, size_t sz)
831 {
832 size_t i;
833
834 if (p->flags & TERMP_NOBUF) {
835 for (i = 0; i < sz; i++)
836 (*p->letter)(p, word[i]);
837 return;
838 }
839
840 if (p->col + 2 + (sz * 5) >= p->tcol->maxcols)
841 adjbuf(p->tcol, p->col + 2 + (sz * 5));
842
843 for (i = 0; i < sz; i++) {
844 if (ASCII_HYPH == word[i] ||
845 isgraph((unsigned char)word[i]))
846 encode1(p, word[i]);
847 else {
848 if (p->tcol->lastcol <= p->col ||
849 (word[i] != ' ' && word[i] != ASCII_NBRSP))
850 p->tcol->buf[p->col] = word[i];
851 p->col++;
852
853 /*
854 * Postpone the effect of \z while handling
855 * an overstrike sequence from ascii_uc2str().
856 */
857
858 if (word[i] == '\b' &&
859 (p->flags & TERMP_BACKBEFORE)) {
860 p->flags &= ~TERMP_BACKBEFORE;
861 p->flags |= TERMP_BACKAFTER;
862 }
863 }
864 }
865 if (p->tcol->lastcol < p->col)
866 p->tcol->lastcol = p->col;
867 }
868
869 void
870 term_setwidth(struct termp *p, const char *wstr)
871 {
872 struct roffsu su;
873 int iop, width;
874
875 iop = 0;
876 width = 0;
877 if (NULL != wstr) {
878 switch (*wstr) {
879 case '+':
880 iop = 1;
881 wstr++;
882 break;
883 case '-':
884 iop = -1;
885 wstr++;
886 break;
887 default:
888 break;
889 }
890 if (a2roffsu(wstr, &su, SCALE_MAX) != NULL)
891 width = term_hspan(p, &su);
892 else
893 iop = 0;
894 }
895 (*p->setwidth)(p, iop, width);
896 }
897
898 size_t
899 term_len(const struct termp *p, size_t sz)
900 {
901
902 return (*p->width)(p, ' ') * sz;
903 }
904
905 static size_t
906 cond_width(const struct termp *p, int c, int *skip)
907 {
908
909 if (*skip) {
910 (*skip) = 0;
911 return 0;
912 } else
913 return (*p->width)(p, c);
914 }
915
916 size_t
917 term_strlen(const struct termp *p, const char *cp)
918 {
919 size_t sz, rsz, i;
920 int ssz, skip, uc;
921 const char *seq, *rhs;
922 enum mandoc_esc esc;
923 static const char rej[] = { '\\', ASCII_NBRSP, ASCII_HYPH,
924 ASCII_BREAK, '\0' };
925
926 /*
927 * Account for escaped sequences within string length
928 * calculations. This follows the logic in term_word() as we
929 * must calculate the width of produced strings.
930 */
931
932 sz = 0;
933 skip = 0;
934 while ('\0' != *cp) {
935 rsz = strcspn(cp, rej);
936 for (i = 0; i < rsz; i++)
937 sz += cond_width(p, *cp++, &skip);
938
939 switch (*cp) {
940 case '\\':
941 cp++;
942 rhs = NULL;
943 esc = mandoc_escape(&cp, &seq, &ssz);
944 switch (esc) {
945 case ESCAPE_UNICODE:
946 uc = mchars_num2uc(seq + 1, ssz - 1);
947 break;
948 case ESCAPE_NUMBERED:
949 uc = mchars_num2char(seq, ssz);
950 if (uc < 0)
951 continue;
952 break;
953 case ESCAPE_SPECIAL:
954 if (p->enc == TERMENC_ASCII) {
955 rhs = mchars_spec2str(seq, ssz, &rsz);
956 if (rhs != NULL)
957 break;
958 } else {
959 uc = mchars_spec2cp(seq, ssz);
960 if (uc > 0)
961 sz += cond_width(p, uc, &skip);
962 }
963 continue;
964 case ESCAPE_UNDEF:
965 uc = *seq;
966 break;
967 case ESCAPE_DEVICE:
968 if (p->type == TERMTYPE_PDF) {
969 rhs = "pdf";
970 rsz = 3;
971 } else if (p->type == TERMTYPE_PS) {
972 rhs = "ps";
973 rsz = 2;
974 } else if (p->enc == TERMENC_ASCII) {
975 rhs = "ascii";
976 rsz = 5;
977 } else {
978 rhs = "utf8";
979 rsz = 4;
980 }
981 break;
982 case ESCAPE_SKIPCHAR:
983 skip = 1;
984 continue;
985 case ESCAPE_OVERSTRIKE:
986 rsz = 0;
987 rhs = seq + ssz;
988 while (seq < rhs) {
989 if (*seq == '\\') {
990 mandoc_escape(&seq, NULL, NULL);
991 continue;
992 }
993 i = (*p->width)(p, *seq++);
994 if (rsz < i)
995 rsz = i;
996 }
997 sz += rsz;
998 continue;
999 default:
1000 continue;
1001 }
1002
1003 /*
1004 * Common handling for Unicode and numbered
1005 * character escape sequences.
1006 */
1007
1008 if (rhs == NULL) {
1009 if (p->enc == TERMENC_ASCII) {
1010 rhs = ascii_uc2str(uc);
1011 rsz = strlen(rhs);
1012 } else {
1013 if ((uc < 0x20 && uc != 0x09) ||
1014 (uc > 0x7E && uc < 0xA0))
1015 uc = 0xFFFD;
1016 sz += cond_width(p, uc, &skip);
1017 continue;
1018 }
1019 }
1020
1021 if (skip) {
1022 skip = 0;
1023 break;
1024 }
1025
1026 /*
1027 * Common handling for all escape sequences
1028 * printing more than one character.
1029 */
1030
1031 for (i = 0; i < rsz; i++)
1032 sz += (*p->width)(p, *rhs++);
1033 break;
1034 case ASCII_NBRSP:
1035 sz += cond_width(p, ' ', &skip);
1036 cp++;
1037 break;
1038 case ASCII_HYPH:
1039 sz += cond_width(p, '-', &skip);
1040 cp++;
1041 break;
1042 default:
1043 break;
1044 }
1045 }
1046
1047 return sz;
1048 }
1049
1050 int
1051 term_vspan(const struct termp *p, const struct roffsu *su)
1052 {
1053 double r;
1054 int ri;
1055
1056 switch (su->unit) {
1057 case SCALE_BU:
1058 r = su->scale / 40.0;
1059 break;
1060 case SCALE_CM:
1061 r = su->scale * 6.0 / 2.54;
1062 break;
1063 case SCALE_FS:
1064 r = su->scale * 65536.0 / 40.0;
1065 break;
1066 case SCALE_IN:
1067 r = su->scale * 6.0;
1068 break;
1069 case SCALE_MM:
1070 r = su->scale * 0.006;
1071 break;
1072 case SCALE_PC:
1073 r = su->scale;
1074 break;
1075 case SCALE_PT:
1076 r = su->scale / 12.0;
1077 break;
1078 case SCALE_EN:
1079 case SCALE_EM:
1080 r = su->scale * 0.6;
1081 break;
1082 case SCALE_VS:
1083 r = su->scale;
1084 break;
1085 default:
1086 abort();
1087 }
1088 ri = r > 0.0 ? r + 0.4995 : r - 0.4995;
1089 return ri < 66 ? ri : 1;
1090 }
1091
1092 /*
1093 * Convert a scaling width to basic units, rounding towards 0.
1094 */
1095 int
1096 term_hspan(const struct termp *p, const struct roffsu *su)
1097 {
1098
1099 return (*p->hspan)(p, su);
1100 }
1101
1102 /*
1103 * Convert a scaling width to basic units, rounding to closest.
1104 */
1105 int
1106 term_hen(const struct termp *p, const struct roffsu *su)
1107 {
1108 int bu;
1109
1110 if ((bu = (*p->hspan)(p, su)) >= 0)
1111 return (bu + 11) / 24;
1112 else
1113 return -((-bu + 11) / 24);
1114 }
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