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mandoc: update to 1.14.5
[unleashed.git] / bin / mandoc / term.c
blob8e97622825822ff5142d8e76f81089666135c0bc
1 /* $Id: term.c,v 1.280 2019/01/15 12:16:18 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 }
285 /* Can break at the end of a word. */
286 if (breakline || vn > vtarget)
287 break;
288 if (graph) {
289 *nbr = ic;
290 *vbr = vis;
291 graph = 0;
292 }
293 vis = vn;
294 continue;
295
296 case '\n': /* Escape \p (break at the end of the word). */
297 breakline = 1;
298 continue;
299
300 case ASCII_HYPH: /* Breakable hyphen. */
301 graph = 1;
302 /*
303 * We are about to decide whether to break the
304 * line or not, so we no longer need this hyphen
305 * to be marked as breakable. Put back a real
306 * hyphen such that we get the correct width.
307 */
308 p->tcol->buf[ic] = '-';
309 vis += (*p->width)(p, '-');
310 if (vis > vtarget) {
311 ic++;
312 break;
313 }
314 *nbr = ic + 1;
315 *vbr = vis;
316 continue;
317
318 case ASCII_NBRSP: /* Non-breakable space. */
319 p->tcol->buf[ic] = ' ';
320 /* FALLTHROUGH */
321 default: /* Printable character. */
322 graph = 1;
323 vis += (*p->width)(p, p->tcol->buf[ic]);
324 if (vis > vtarget && *nbr > 0)
325 return;
326 continue;
327 }
328 break;
329 }
330
331 /*
332 * If the last word extends to the end of the field without any
333 * trailing whitespace, the loop could not check yet whether it
334 * can remain on this line. So do the check now.
335 */
336
337 if (graph && (vis <= vtarget || *nbr == 0)) {
338 *nbr = ic;
339 *vbr = vis;
340 }
341 }
342
343 /*
344 * Print the contents of one field
345 * with an indentation of vbl visual columns,
346 * an input string length of nbr characters,
347 * an output width of vbr visual columns,
348 * and a desired field width of vtarget visual columns.
349 */
350 static void
351 term_field(struct termp *p, size_t vbl, size_t nbr, size_t vbr, size_t vtarget)
352 {
353 size_t ic; /* Character position in the input buffer. */
354 size_t vis; /* Visual position of the current character. */
355 size_t dv; /* Visual width of the current character. */
356 size_t vn; /* Visual position of the next character. */
357
358 vis = 0;
359 for (ic = p->tcol->col; ic < nbr; ic++) {
360
361 /*
362 * To avoid the printing of trailing whitespace,
363 * do not print whitespace right away, only count it.
364 */
365
366 switch (p->tcol->buf[ic]) {
367 case '\n':
368 case ASCII_BREAK:
369 continue;
370 case '\t':
371 vn = term_tab_next(vis);
372 vbl += vn - vis;
373 vis = vn;
374 continue;
375 case ' ':
376 case ASCII_NBRSP:
377 dv = (*p->width)(p, ' ');
378 vbl += dv;
379 vis += dv;
380 continue;
381 default:
382 break;
383 }
384
385 /*
386 * We found a non-blank character to print,
387 * so write preceding white space now.
388 */
389
390 if (vbl > 0) {
391 (*p->advance)(p, vbl);
392 p->viscol += vbl;
393 vbl = 0;
394 }
395
396 /* Print the character and adjust the visual position. */
397
398 (*p->letter)(p, p->tcol->buf[ic]);
399 if (p->tcol->buf[ic] == '\b') {
400 dv = (*p->width)(p, p->tcol->buf[ic - 1]);
401 p->viscol -= dv;
402 vis -= dv;
403 } else {
404 dv = (*p->width)(p, p->tcol->buf[ic]);
405 p->viscol += dv;
406 vis += dv;
407 }
408 }
409 p->tcol->col = nbr;
410 }
411
412 static void
413 endline(struct termp *p)
414 {
415 if ((p->flags & (TERMP_NEWMC | TERMP_ENDMC)) == TERMP_ENDMC) {
416 p->mc = NULL;
417 p->flags &= ~TERMP_ENDMC;
418 }
419 if (p->mc != NULL) {
420 if (p->viscol && p->maxrmargin >= p->viscol)
421 (*p->advance)(p, p->maxrmargin - p->viscol + 1);
422 p->flags |= TERMP_NOBUF | TERMP_NOSPACE;
423 term_word(p, p->mc);
424 p->flags &= ~(TERMP_NOBUF | TERMP_NEWMC);
425 }
426 p->viscol = 0;
427 p->minbl = 0;
428 (*p->endline)(p);
429 }
430
431 /*
432 * A newline only breaks an existing line; it won't assert vertical
433 * space. All data in the output buffer is flushed prior to the newline
434 * assertion.
435 */
436 void
437 term_newln(struct termp *p)
438 {
439
440 p->flags |= TERMP_NOSPACE;
441 if (p->tcol->lastcol || p->viscol)
442 term_flushln(p);
443 }
444
445 /*
446 * Asserts a vertical space (a full, empty line-break between lines).
447 * Note that if used twice, this will cause two blank spaces and so on.
448 * All data in the output buffer is flushed prior to the newline
449 * assertion.
450 */
451 void
452 term_vspace(struct termp *p)
453 {
454
455 term_newln(p);
456 p->viscol = 0;
457 p->minbl = 0;
458 if (0 < p->skipvsp)
459 p->skipvsp--;
460 else
461 (*p->endline)(p);
462 }
463
464 /* Swap current and previous font; for \fP and .ft P */
465 void
466 term_fontlast(struct termp *p)
467 {
468 enum termfont f;
469
470 f = p->fontl;
471 p->fontl = p->fontq[p->fonti];
472 p->fontq[p->fonti] = f;
473 }
474
475 /* Set font, save current, discard previous; for \f, .ft, .B etc. */
476 void
477 term_fontrepl(struct termp *p, enum termfont f)
478 {
479
480 p->fontl = p->fontq[p->fonti];
481 p->fontq[p->fonti] = f;
482 }
483
484 /* Set font, save previous. */
485 void
486 term_fontpush(struct termp *p, enum termfont f)
487 {
488
489 p->fontl = p->fontq[p->fonti];
490 if (++p->fonti == p->fontsz) {
491 p->fontsz += 8;
492 p->fontq = mandoc_reallocarray(p->fontq,
493 p->fontsz, sizeof(*p->fontq));
494 }
495 p->fontq[p->fonti] = f;
496 }
497
498 /* Flush to make the saved pointer current again. */
499 void
500 term_fontpopq(struct termp *p, int i)
501 {
502
503 assert(i >= 0);
504 if (p->fonti > i)
505 p->fonti = i;
506 }
507
508 /* Pop one font off the stack. */
509 void
510 term_fontpop(struct termp *p)
511 {
512
513 assert(p->fonti);
514 p->fonti--;
515 }
516
517 /*
518 * Handle pwords, partial words, which may be either a single word or a
519 * phrase that cannot be broken down (such as a literal string). This
520 * handles word styling.
521 */
522 void
523 term_word(struct termp *p, const char *word)
524 {
525 struct roffsu su;
526 const char nbrsp[2] = { ASCII_NBRSP, 0 };
527 const char *seq, *cp;
528 int sz, uc;
529 size_t csz, lsz, ssz;
530 enum mandoc_esc esc;
531
532 if ((p->flags & TERMP_NOBUF) == 0) {
533 if ((p->flags & TERMP_NOSPACE) == 0) {
534 if ((p->flags & TERMP_KEEP) == 0) {
535 bufferc(p, ' ');
536 if (p->flags & TERMP_SENTENCE)
537 bufferc(p, ' ');
538 } else
539 bufferc(p, ASCII_NBRSP);
540 }
541 if (p->flags & TERMP_PREKEEP)
542 p->flags |= TERMP_KEEP;
543 if (p->flags & TERMP_NONOSPACE)
544 p->flags |= TERMP_NOSPACE;
545 else
546 p->flags &= ~TERMP_NOSPACE;
547 p->flags &= ~(TERMP_SENTENCE | TERMP_NONEWLINE);
548 p->skipvsp = 0;
549 }
550
551 while ('\0' != *word) {
552 if ('\\' != *word) {
553 if (TERMP_NBRWORD & p->flags) {
554 if (' ' == *word) {
555 encode(p, nbrsp, 1);
556 word++;
557 continue;
558 }
559 ssz = strcspn(word, "\\ ");
560 } else
561 ssz = strcspn(word, "\\");
562 encode(p, word, ssz);
563 word += (int)ssz;
564 continue;
565 }
566
567 word++;
568 esc = mandoc_escape(&word, &seq, &sz);
569 switch (esc) {
570 case ESCAPE_UNICODE:
571 uc = mchars_num2uc(seq + 1, sz - 1);
572 break;
573 case ESCAPE_NUMBERED:
574 uc = mchars_num2char(seq, sz);
575 if (uc < 0)
576 continue;
577 break;
578 case ESCAPE_SPECIAL:
579 if (p->enc == TERMENC_ASCII) {
580 cp = mchars_spec2str(seq, sz, &ssz);
581 if (cp != NULL)
582 encode(p, cp, ssz);
583 } else {
584 uc = mchars_spec2cp(seq, sz);
585 if (uc > 0)
586 encode1(p, uc);
587 }
588 continue;
589 case ESCAPE_UNDEF:
590 uc = *seq;
591 break;
592 case ESCAPE_FONTBOLD:
593 term_fontrepl(p, TERMFONT_BOLD);
594 continue;
595 case ESCAPE_FONTITALIC:
596 term_fontrepl(p, TERMFONT_UNDER);
597 continue;
598 case ESCAPE_FONTBI:
599 term_fontrepl(p, TERMFONT_BI);
600 continue;
601 case ESCAPE_FONT:
602 case ESCAPE_FONTCW:
603 case ESCAPE_FONTROMAN:
604 term_fontrepl(p, TERMFONT_NONE);
605 continue;
606 case ESCAPE_FONTPREV:
607 term_fontlast(p);
608 continue;
609 case ESCAPE_BREAK:
610 bufferc(p, '\n');
611 continue;
612 case ESCAPE_NOSPACE:
613 if (p->flags & TERMP_BACKAFTER)
614 p->flags &= ~TERMP_BACKAFTER;
615 else if (*word == '\0')
616 p->flags |= (TERMP_NOSPACE | TERMP_NONEWLINE);
617 continue;
618 case ESCAPE_DEVICE:
619 if (p->type == TERMTYPE_PDF)
620 encode(p, "pdf", 3);
621 else if (p->type == TERMTYPE_PS)
622 encode(p, "ps", 2);
623 else if (p->enc == TERMENC_ASCII)
624 encode(p, "ascii", 5);
625 else
626 encode(p, "utf8", 4);
627 continue;
628 case ESCAPE_HORIZ:
629 if (*seq == '|') {
630 seq++;
631 uc = -p->col;
632 } else
633 uc = 0;
634 if (a2roffsu(seq, &su, SCALE_EM) == NULL)
635 continue;
636 uc += term_hen(p, &su);
637 if (uc > 0)
638 while (uc-- > 0)
639 bufferc(p, ASCII_NBRSP);
640 else if (p->col > (size_t)(-uc))
641 p->col += uc;
642 else {
643 uc += p->col;
644 p->col = 0;
645 if (p->tcol->offset > (size_t)(-uc)) {
646 p->ti += uc;
647 p->tcol->offset += uc;
648 } else {
649 p->ti -= p->tcol->offset;
650 p->tcol->offset = 0;
651 }
652 }
653 continue;
654 case ESCAPE_HLINE:
655 if ((cp = a2roffsu(seq, &su, SCALE_EM)) == NULL)
656 continue;
657 uc = term_hen(p, &su);
658 if (uc <= 0) {
659 if (p->tcol->rmargin <= p->tcol->offset)
660 continue;
661 lsz = p->tcol->rmargin - p->tcol->offset;
662 } else
663 lsz = uc;
664 if (*cp == seq[-1])
665 uc = -1;
666 else if (*cp == '\\') {
667 seq = cp + 1;
668 esc = mandoc_escape(&seq, &cp, &sz);
669 switch (esc) {
670 case ESCAPE_UNICODE:
671 uc = mchars_num2uc(cp + 1, sz - 1);
672 break;
673 case ESCAPE_NUMBERED:
674 uc = mchars_num2char(cp, sz);
675 break;
676 case ESCAPE_SPECIAL:
677 uc = mchars_spec2cp(cp, sz);
678 break;
679 case ESCAPE_UNDEF:
680 uc = *seq;
681 break;
682 default:
683 uc = -1;
684 break;
685 }
686 } else
687 uc = *cp;
688 if (uc < 0x20 || (uc > 0x7E && uc < 0xA0))
689 uc = '_';
690 if (p->enc == TERMENC_ASCII) {
691 cp = ascii_uc2str(uc);
692 csz = term_strlen(p, cp);
693 ssz = strlen(cp);
694 } else
695 csz = (*p->width)(p, uc);
696 while (lsz >= csz) {
697 if (p->enc == TERMENC_ASCII)
698 encode(p, cp, ssz);
699 else
700 encode1(p, uc);
701 lsz -= csz;
702 }
703 continue;
704 case ESCAPE_SKIPCHAR:
705 p->flags |= TERMP_BACKAFTER;
706 continue;
707 case ESCAPE_OVERSTRIKE:
708 cp = seq + sz;
709 while (seq < cp) {
710 if (*seq == '\\') {
711 mandoc_escape(&seq, NULL, NULL);
712 continue;
713 }
714 encode1(p, *seq++);
715 if (seq < cp) {
716 if (p->flags & TERMP_BACKBEFORE)
717 p->flags |= TERMP_BACKAFTER;
718 else
719 p->flags |= TERMP_BACKBEFORE;
720 }
721 }
722 /* Trim trailing backspace/blank pair. */
723 if (p->tcol->lastcol > 2 &&
724 (p->tcol->buf[p->tcol->lastcol - 1] == ' ' ||
725 p->tcol->buf[p->tcol->lastcol - 1] == '\t'))
726 p->tcol->lastcol -= 2;
727 if (p->col > p->tcol->lastcol)
728 p->col = p->tcol->lastcol;
729 continue;
730 default:
731 continue;
732 }
733
734 /*
735 * Common handling for Unicode and numbered
736 * character escape sequences.
737 */
738
739 if (p->enc == TERMENC_ASCII) {
740 cp = ascii_uc2str(uc);
741 encode(p, cp, strlen(cp));
742 } else {
743 if ((uc < 0x20 && uc != 0x09) ||
744 (uc > 0x7E && uc < 0xA0))
745 uc = 0xFFFD;
746 encode1(p, uc);
747 }
748 }
749 p->flags &= ~TERMP_NBRWORD;
750 }
751
752 static void
753 adjbuf(struct termp_col *c, size_t sz)
754 {
755 if (c->maxcols == 0)
756 c->maxcols = 1024;
757 while (c->maxcols <= sz)
758 c->maxcols <<= 2;
759 c->buf = mandoc_reallocarray(c->buf, c->maxcols, sizeof(*c->buf));
760 }
761
762 static void
763 bufferc(struct termp *p, char c)
764 {
765 if (p->flags & TERMP_NOBUF) {
766 (*p->letter)(p, c);
767 return;
768 }
769 if (p->col + 1 >= p->tcol->maxcols)
770 adjbuf(p->tcol, p->col + 1);
771 if (p->tcol->lastcol <= p->col || (c != ' ' && c != ASCII_NBRSP))
772 p->tcol->buf[p->col] = c;
773 if (p->tcol->lastcol < ++p->col)
774 p->tcol->lastcol = p->col;
775 }
776
777 /*
778 * See encode().
779 * Do this for a single (probably unicode) value.
780 * Does not check for non-decorated glyphs.
781 */
782 static void
783 encode1(struct termp *p, int c)
784 {
785 enum termfont f;
786
787 if (p->flags & TERMP_NOBUF) {
788 (*p->letter)(p, c);
789 return;
790 }
791
792 if (p->col + 7 >= p->tcol->maxcols)
793 adjbuf(p->tcol, p->col + 7);
794
795 f = (c == ASCII_HYPH || c > 127 || isgraph(c)) ?
796 p->fontq[p->fonti] : TERMFONT_NONE;
797
798 if (p->flags & TERMP_BACKBEFORE) {
799 if (p->tcol->buf[p->col - 1] == ' ' ||
800 p->tcol->buf[p->col - 1] == '\t')
801 p->col--;
802 else
803 p->tcol->buf[p->col++] = '\b';
804 p->flags &= ~TERMP_BACKBEFORE;
805 }
806 if (f == TERMFONT_UNDER || f == TERMFONT_BI) {
807 p->tcol->buf[p->col++] = '_';
808 p->tcol->buf[p->col++] = '\b';
809 }
810 if (f == TERMFONT_BOLD || f == TERMFONT_BI) {
811 if (c == ASCII_HYPH)
812 p->tcol->buf[p->col++] = '-';
813 else
814 p->tcol->buf[p->col++] = c;
815 p->tcol->buf[p->col++] = '\b';
816 }
817 if (p->tcol->lastcol <= p->col || (c != ' ' && c != ASCII_NBRSP))
818 p->tcol->buf[p->col] = c;
819 if (p->tcol->lastcol < ++p->col)
820 p->tcol->lastcol = p->col;
821 if (p->flags & TERMP_BACKAFTER) {
822 p->flags |= TERMP_BACKBEFORE;
823 p->flags &= ~TERMP_BACKAFTER;
824 }
825 }
826
827 static void
828 encode(struct termp *p, const char *word, size_t sz)
829 {
830 size_t i;
831
832 if (p->flags & TERMP_NOBUF) {
833 for (i = 0; i < sz; i++)
834 (*p->letter)(p, word[i]);
835 return;
836 }
837
838 if (p->col + 2 + (sz * 5) >= p->tcol->maxcols)
839 adjbuf(p->tcol, p->col + 2 + (sz * 5));
840
841 for (i = 0; i < sz; i++) {
842 if (ASCII_HYPH == word[i] ||
843 isgraph((unsigned char)word[i]))
844 encode1(p, word[i]);
845 else {
846 if (p->tcol->lastcol <= p->col ||
847 (word[i] != ' ' && word[i] != ASCII_NBRSP))
848 p->tcol->buf[p->col] = word[i];
849 p->col++;
850
851 /*
852 * Postpone the effect of \z while handling
853 * an overstrike sequence from ascii_uc2str().
854 */
855
856 if (word[i] == '\b' &&
857 (p->flags & TERMP_BACKBEFORE)) {
858 p->flags &= ~TERMP_BACKBEFORE;
859 p->flags |= TERMP_BACKAFTER;
860 }
861 }
862 }
863 if (p->tcol->lastcol < p->col)
864 p->tcol->lastcol = p->col;
865 }
866
867 void
868 term_setwidth(struct termp *p, const char *wstr)
869 {
870 struct roffsu su;
871 int iop, width;
872
873 iop = 0;
874 width = 0;
875 if (NULL != wstr) {
876 switch (*wstr) {
877 case '+':
878 iop = 1;
879 wstr++;
880 break;
881 case '-':
882 iop = -1;
883 wstr++;
884 break;
885 default:
886 break;
887 }
888 if (a2roffsu(wstr, &su, SCALE_MAX) != NULL)
889 width = term_hspan(p, &su);
890 else
891 iop = 0;
892 }
893 (*p->setwidth)(p, iop, width);
894 }
895
896 size_t
897 term_len(const struct termp *p, size_t sz)
898 {
899
900 return (*p->width)(p, ' ') * sz;
901 }
902
903 static size_t
904 cond_width(const struct termp *p, int c, int *skip)
905 {
906
907 if (*skip) {
908 (*skip) = 0;
909 return 0;
910 } else
911 return (*p->width)(p, c);
912 }
913
914 size_t
915 term_strlen(const struct termp *p, const char *cp)
916 {
917 size_t sz, rsz, i;
918 int ssz, skip, uc;
919 const char *seq, *rhs;
920 enum mandoc_esc esc;
921 static const char rej[] = { '\\', ASCII_NBRSP, ASCII_HYPH,
922 ASCII_BREAK, '\0' };
923
924 /*
925 * Account for escaped sequences within string length
926 * calculations. This follows the logic in term_word() as we
927 * must calculate the width of produced strings.
928 */
929
930 sz = 0;
931 skip = 0;
932 while ('\0' != *cp) {
933 rsz = strcspn(cp, rej);
934 for (i = 0; i < rsz; i++)
935 sz += cond_width(p, *cp++, &skip);
936
937 switch (*cp) {
938 case '\\':
939 cp++;
940 rhs = NULL;
941 esc = mandoc_escape(&cp, &seq, &ssz);
942 switch (esc) {
943 case ESCAPE_UNICODE:
944 uc = mchars_num2uc(seq + 1, ssz - 1);
945 break;
946 case ESCAPE_NUMBERED:
947 uc = mchars_num2char(seq, ssz);
948 if (uc < 0)
949 continue;
950 break;
951 case ESCAPE_SPECIAL:
952 if (p->enc == TERMENC_ASCII) {
953 rhs = mchars_spec2str(seq, ssz, &rsz);
954 if (rhs != NULL)
955 break;
956 } else {
957 uc = mchars_spec2cp(seq, ssz);
958 if (uc > 0)
959 sz += cond_width(p, uc, &skip);
960 }
961 continue;
962 case ESCAPE_UNDEF:
963 uc = *seq;
964 break;
965 case ESCAPE_DEVICE:
966 if (p->type == TERMTYPE_PDF) {
967 rhs = "pdf";
968 rsz = 3;
969 } else if (p->type == TERMTYPE_PS) {
970 rhs = "ps";
971 rsz = 2;
972 } else if (p->enc == TERMENC_ASCII) {
973 rhs = "ascii";
974 rsz = 5;
975 } else {
976 rhs = "utf8";
977 rsz = 4;
978 }
979 break;
980 case ESCAPE_SKIPCHAR:
981 skip = 1;
982 continue;
983 case ESCAPE_OVERSTRIKE:
984 rsz = 0;
985 rhs = seq + ssz;
986 while (seq < rhs) {
987 if (*seq == '\\') {
988 mandoc_escape(&seq, NULL, NULL);
989 continue;
990 }
991 i = (*p->width)(p, *seq++);
992 if (rsz < i)
993 rsz = i;
994 }
995 sz += rsz;
996 continue;
997 default:
998 continue;
999 }
1000
1001 /*
1002 * Common handling for Unicode and numbered
1003 * character escape sequences.
1004 */
1005
1006 if (rhs == NULL) {
1007 if (p->enc == TERMENC_ASCII) {
1008 rhs = ascii_uc2str(uc);
1009 rsz = strlen(rhs);
1010 } else {
1011 if ((uc < 0x20 && uc != 0x09) ||
1012 (uc > 0x7E && uc < 0xA0))
1013 uc = 0xFFFD;
1014 sz += cond_width(p, uc, &skip);
1015 continue;
1016 }
1017 }
1018
1019 if (skip) {
1020 skip = 0;
1021 break;
1022 }
1023
1024 /*
1025 * Common handling for all escape sequences
1026 * printing more than one character.
1027 */
1028
1029 for (i = 0; i < rsz; i++)
1030 sz += (*p->width)(p, *rhs++);
1031 break;
1032 case ASCII_NBRSP:
1033 sz += cond_width(p, ' ', &skip);
1034 cp++;
1035 break;
1036 case ASCII_HYPH:
1037 sz += cond_width(p, '-', &skip);
1038 cp++;
1039 break;
1040 default:
1041 break;
1042 }
1043 }
1044
1045 return sz;
1046 }
1047
1048 int
1049 term_vspan(const struct termp *p, const struct roffsu *su)
1050 {
1051 double r;
1052 int ri;
1053
1054 switch (su->unit) {
1055 case SCALE_BU:
1056 r = su->scale / 40.0;
1057 break;
1058 case SCALE_CM:
1059 r = su->scale * 6.0 / 2.54;
1060 break;
1061 case SCALE_FS:
1062 r = su->scale * 65536.0 / 40.0;
1063 break;
1064 case SCALE_IN:
1065 r = su->scale * 6.0;
1066 break;
1067 case SCALE_MM:
1068 r = su->scale * 0.006;
1069 break;
1070 case SCALE_PC:
1071 r = su->scale;
1072 break;
1073 case SCALE_PT:
1074 r = su->scale / 12.0;
1075 break;
1076 case SCALE_EN:
1077 case SCALE_EM:
1078 r = su->scale * 0.6;
1079 break;
1080 case SCALE_VS:
1081 r = su->scale;
1082 break;
1083 default:
1084 abort();
1085 }
1086 ri = r > 0.0 ? r + 0.4995 : r - 0.4995;
1087 return ri < 66 ? ri : 1;
1088 }
1089
1090 /*
1091 * Convert a scaling width to basic units, rounding towards 0.
1092 */
1093 int
1094 term_hspan(const struct termp *p, const struct roffsu *su)
1095 {
1096
1097 return (*p->hspan)(p, su);
1098 }
1099
1100 /*
1101 * Convert a scaling width to basic units, rounding to closest.
1102 */
1103 int
1104 term_hen(const struct termp *p, const struct roffsu *su)
1105 {
1106 int bu;
1107
1108 if ((bu = (*p->hspan)(p, su)) >= 0)
1109 return (bu + 11) / 24;
1110 else
1111 return -((-bu + 11) / 24);
1112 }
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