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1 /* $Id: term.c,v 1.282 2020/09/02 16:40:36 schwarze Exp $ */
2 /*
3 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
4 * Copyright (c) 2010-2020 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 static void term_fill(struct termp *, size_t *, size_t *,
43 size_t);
44
45
46 void
47 term_setcol(struct termp *p, size_t maxtcol)
48 {
49 if (maxtcol > p->maxtcol) {
50 p->tcols = mandoc_recallocarray(p->tcols,
51 p->maxtcol, maxtcol, sizeof(*p->tcols));
52 p->maxtcol = maxtcol;
53 }
54 p->lasttcol = maxtcol - 1;
55 p->tcol = p->tcols;
56 }
57
58 void
59 term_free(struct termp *p)
60 {
61 for (p->tcol = p->tcols; p->tcol < p->tcols + p->maxtcol; p->tcol++)
62 free(p->tcol->buf);
63 free(p->tcols);
64 free(p->fontq);
65 free(p);
66 }
67
68 void
69 term_begin(struct termp *p, term_margin head,
70 term_margin foot, const struct roff_meta *arg)
71 {
72
73 p->headf = head;
74 p->footf = foot;
75 p->argf = arg;
76 (*p->begin)(p);
77 }
78
79 void
80 term_end(struct termp *p)
81 {
82
83 (*p->end)(p);
84 }
85
86 /*
87 * Flush a chunk of text. By default, break the output line each time
88 * the right margin is reached, and continue output on the next line
89 * at the same offset as the chunk itself. By default, also break the
90 * output line at the end of the chunk. There are many flags modifying
91 * this behaviour, see the comments in the body of the function.
92 */
93 void
94 term_flushln(struct termp *p)
95 {
96 size_t vbl; /* Number of blanks to prepend to the output. */
97 size_t vbr; /* Actual visual position of the end of field. */
98 size_t vfield; /* Desired visual field width. */
99 size_t vtarget; /* Desired visual position of the right margin. */
100 size_t ic; /* Character position in the input buffer. */
101 size_t nbr; /* Number of characters to print in this field. */
102
103 /*
104 * Normally, start writing at the left margin, but with the
105 * NOPAD flag, start writing at the current position instead.
106 */
107
108 vbl = (p->flags & TERMP_NOPAD) || p->tcol->offset < p->viscol ?
109 0 : p->tcol->offset - p->viscol;
110 if (p->minbl && vbl < p->minbl)
111 vbl = p->minbl;
112
113 if ((p->flags & TERMP_MULTICOL) == 0)
114 p->tcol->col = 0;
115
116 /* Loop over output lines. */
117
118 for (;;) {
119 vfield = p->tcol->rmargin > p->viscol + vbl ?
120 p->tcol->rmargin - p->viscol - vbl : 0;
121
122 /*
123 * Normally, break the line at the the right margin
124 * of the field, but with the NOBREAK flag, only
125 * break it at the max right margin of the screen,
126 * and with the BRNEVER flag, never break it at all.
127 */
128
129 vtarget = (p->flags & TERMP_NOBREAK) == 0 ? vfield :
130 p->maxrmargin > p->viscol + vbl ?
131 p->maxrmargin - p->viscol - vbl : 0;
132
133 /*
134 * Figure out how much text will fit in the field.
135 * If there is whitespace only, print nothing.
136 */
137
138 term_fill(p, &nbr, &vbr,
139 p->flags & TERMP_BRNEVER ? SIZE_MAX : vtarget);
140 if (nbr == 0)
141 break;
142
143 /*
144 * With the CENTER or RIGHT flag, increase the indentation
145 * to center the text between the left and right margins
146 * or to adjust it to the right margin, respectively.
147 */
148
149 if (vbr < vtarget) {
150 if (p->flags & TERMP_CENTER)
151 vbl += (vtarget - vbr) / 2;
152 else if (p->flags & TERMP_RIGHT)
153 vbl += vtarget - vbr;
154 }
155
156 /* Finally, print the field content. */
157
158 term_field(p, vbl, nbr);
159
160 /*
161 * If there is no text left in the field, exit the loop.
162 * If the BRTRSP flag is set, consider trailing
163 * whitespace significant when deciding whether
164 * the field fits or not.
165 */
166
167 for (ic = p->tcol->col; ic < p->tcol->lastcol; ic++) {
168 switch (p->tcol->buf[ic]) {
169 case '\t':
170 if (p->flags & TERMP_BRTRSP)
171 vbr = term_tab_next(vbr);
172 continue;
173 case ' ':
174 if (p->flags & TERMP_BRTRSP)
175 vbr += (*p->width)(p, ' ');
176 continue;
177 case '\n':
178 case ASCII_BREAK:
179 continue;
180 default:
181 break;
182 }
183 break;
184 }
185 if (ic == p->tcol->lastcol)
186 break;
187
188 /*
189 * At the location of an automtic line break, input
190 * space characters are consumed by the line break.
191 */
192
193 while (p->tcol->col < p->tcol->lastcol &&
194 p->tcol->buf[p->tcol->col] == ' ')
195 p->tcol->col++;
196
197 /*
198 * In multi-column mode, leave the rest of the text
199 * in the buffer to be handled by a subsequent
200 * invocation, such that the other columns of the
201 * table can be handled first.
202 * In single-column mode, simply break the line.
203 */
204
205 if (p->flags & TERMP_MULTICOL)
206 return;
207
208 endline(p);
209 p->viscol = 0;
210
211 /*
212 * Normally, start the next line at the same indentation
213 * as this one, but with the BRIND flag, start it at the
214 * right margin instead. This is used together with
215 * NOBREAK for the tags in various kinds of tagged lists.
216 */
217
218 vbl = p->flags & TERMP_BRIND ?
219 p->tcol->rmargin : p->tcol->offset;
220 }
221
222 /* Reset output state in preparation for the next field. */
223
224 p->col = p->tcol->col = p->tcol->lastcol = 0;
225 p->minbl = p->trailspace;
226 p->flags &= ~(TERMP_BACKAFTER | TERMP_BACKBEFORE | TERMP_NOPAD);
227
228 if (p->flags & TERMP_MULTICOL)
229 return;
230
231 /*
232 * The HANG flag means that the next field
233 * always follows on the same line.
234 * The NOBREAK flag means that the next field
235 * follows on the same line unless the field was overrun.
236 * Normally, break the line at the end of each field.
237 */
238
239 if ((p->flags & TERMP_HANG) == 0 &&
240 ((p->flags & TERMP_NOBREAK) == 0 ||
241 vbr + term_len(p, p->trailspace) > vfield))
242 endline(p);
243 }
244
245 /*
246 * Store the number of input characters to print in this field in *nbr
247 * and their total visual width to print in *vbr.
248 * If there is only whitespace in the field, both remain zero.
249 * The desired visual width of the field is provided by vtarget.
250 * If the first word is longer, the field will be overrun.
251 */
252 static void
253 term_fill(struct termp *p, size_t *nbr, size_t *vbr, size_t vtarget)
254 {
255 size_t ic; /* Character position in the input buffer. */
256 size_t vis; /* Visual position of the current character. */
257 size_t vn; /* Visual position of the next character. */
258 int breakline; /* Break at the end of this word. */
259 int graph; /* Last character was non-blank. */
260
261 *nbr = *vbr = vis = 0;
262 breakline = graph = 0;
263 for (ic = p->tcol->col; ic < p->tcol->lastcol; ic++) {
264 switch (p->tcol->buf[ic]) {
265 case '\b': /* Escape \o (overstrike) or backspace markup. */
266 assert(ic > 0);
267 vis -= (*p->width)(p, p->tcol->buf[ic - 1]);
268 continue;
269
270 case '\t': /* Normal ASCII whitespace. */
271 case ' ':
272 case ASCII_BREAK: /* Escape \: (breakpoint). */
273 switch (p->tcol->buf[ic]) {
274 case '\t':
275 vn = term_tab_next(vis);
276 break;
277 case ' ':
278 vn = vis + (*p->width)(p, ' ');
279 break;
280 case ASCII_BREAK:
281 vn = vis;
282 break;
283 default:
284 abort();
285 }
286 /* Can break at the end of a word. */
287 if (breakline || vn > vtarget)
288 break;
289 if (graph) {
290 *nbr = ic;
291 *vbr = vis;
292 graph = 0;
293 }
294 vis = vn;
295 continue;
296
297 case '\n': /* Escape \p (break at the end of the word). */
298 breakline = 1;
299 continue;
300
301 case ASCII_HYPH: /* Breakable hyphen. */
302 graph = 1;
303 /*
304 * We are about to decide whether to break the
305 * line or not, so we no longer need this hyphen
306 * to be marked as breakable. Put back a real
307 * hyphen such that we get the correct width.
308 */
309 p->tcol->buf[ic] = '-';
310 vis += (*p->width)(p, '-');
311 if (vis > vtarget) {
312 ic++;
313 break;
314 }
315 *nbr = ic + 1;
316 *vbr = vis;
317 continue;
318
319 case ASCII_NBRSP: /* Non-breakable space. */
320 p->tcol->buf[ic] = ' ';
321 /* FALLTHROUGH */
322 default: /* Printable character. */
323 graph = 1;
324 vis += (*p->width)(p, p->tcol->buf[ic]);
325 if (vis > vtarget && *nbr > 0)
326 return;
327 continue;
328 }
329 break;
330 }
331
332 /*
333 * If the last word extends to the end of the field without any
334 * trailing whitespace, the loop could not check yet whether it
335 * can remain on this line. So do the check now.
336 */
337
338 if (graph && (vis <= vtarget || *nbr == 0)) {
339 *nbr = ic;
340 *vbr = vis;
341 }
342 }
343
344 /*
345 * Print the contents of one field
346 * with an indentation of vbl visual columns,
347 * and an input string length of nbr characters.
348 */
349 static void
350 term_field(struct termp *p, size_t vbl, size_t nbr)
351 {
352 size_t ic; /* Character position in the input buffer. */
353 size_t vis; /* Visual position of the current character. */
354 size_t dv; /* Visual width of the current character. */
355 size_t vn; /* Visual position of the next character. */
356
357 vis = 0;
358 for (ic = p->tcol->col; ic < nbr; ic++) {
359
360 /*
361 * To avoid the printing of trailing whitespace,
362 * do not print whitespace right away, only count it.
363 */
364
365 switch (p->tcol->buf[ic]) {
366 case '\n':
367 case ASCII_BREAK:
368 continue;
369 case '\t':
370 vn = term_tab_next(vis);
371 vbl += vn - vis;
372 vis = vn;
373 continue;
374 case ' ':
375 case ASCII_NBRSP:
376 dv = (*p->width)(p, ' ');
377 vbl += dv;
378 vis += dv;
379 continue;
380 default:
381 break;
382 }
383
384 /*
385 * We found a non-blank character to print,
386 * so write preceding white space now.
387 */
388
389 if (vbl > 0) {
390 (*p->advance)(p, vbl);
391 p->viscol += vbl;
392 vbl = 0;
393 }
394
395 /* Print the character and adjust the visual position. */
396
397 (*p->letter)(p, p->tcol->buf[ic]);
398 if (p->tcol->buf[ic] == '\b') {
399 dv = (*p->width)(p, p->tcol->buf[ic - 1]);
400 p->viscol -= dv;
401 vis -= dv;
402 } else {
403 dv = (*p->width)(p, p->tcol->buf[ic]);
404 p->viscol += dv;
405 vis += dv;
406 }
407 }
408 p->tcol->col = nbr;
409 }
410
411 static void
412 endline(struct termp *p)
413 {
414 if ((p->flags & (TERMP_NEWMC | TERMP_ENDMC)) == TERMP_ENDMC) {
415 p->mc = NULL;
416 p->flags &= ~TERMP_ENDMC;
417 }
418 if (p->mc != NULL) {
419 if (p->viscol && p->maxrmargin >= p->viscol)
420 (*p->advance)(p, p->maxrmargin - p->viscol + 1);
421 p->flags |= TERMP_NOBUF | TERMP_NOSPACE;
422 term_word(p, p->mc);
423 p->flags &= ~(TERMP_NOBUF | TERMP_NEWMC);
424 }
425 p->viscol = 0;
426 p->minbl = 0;
427 (*p->endline)(p);
428 }
429
430 /*
431 * A newline only breaks an existing line; it won't assert vertical
432 * space. All data in the output buffer is flushed prior to the newline
433 * assertion.
434 */
435 void
436 term_newln(struct termp *p)
437 {
438
439 p->flags |= TERMP_NOSPACE;
440 if (p->tcol->lastcol || p->viscol)
441 term_flushln(p);
442 }
443
444 /*
445 * Asserts a vertical space (a full, empty line-break between lines).
446 * Note that if used twice, this will cause two blank spaces and so on.
447 * All data in the output buffer is flushed prior to the newline
448 * assertion.
449 */
450 void
451 term_vspace(struct termp *p)
452 {
453
454 term_newln(p);
455 p->viscol = 0;
456 p->minbl = 0;
457 if (0 < p->skipvsp)
458 p->skipvsp--;
459 else
460 (*p->endline)(p);
461 }
462
463 /* Swap current and previous font; for \fP and .ft P */
464 void
465 term_fontlast(struct termp *p)
466 {
467 enum termfont f;
468
469 f = p->fontl;
470 p->fontl = p->fontq[p->fonti];
471 p->fontq[p->fonti] = f;
472 }
473
474 /* Set font, save current, discard previous; for \f, .ft, .B etc. */
475 void
476 term_fontrepl(struct termp *p, enum termfont f)
477 {
478
479 p->fontl = p->fontq[p->fonti];
480 p->fontq[p->fonti] = f;
481 }
482
483 /* Set font, save previous. */
484 void
485 term_fontpush(struct termp *p, enum termfont f)
486 {
487
488 p->fontl = p->fontq[p->fonti];
489 if (++p->fonti == p->fontsz) {
490 p->fontsz += 8;
491 p->fontq = mandoc_reallocarray(p->fontq,
492 p->fontsz, sizeof(*p->fontq));
493 }
494 p->fontq[p->fonti] = f;
495 }
496
497 /* Flush to make the saved pointer current again. */
498 void
499 term_fontpopq(struct termp *p, int i)
500 {
501
502 assert(i >= 0);
503 if (p->fonti > i)
504 p->fonti = i;
505 }
506
507 /* Pop one font off the stack. */
508 void
509 term_fontpop(struct termp *p)
510 {
511
512 assert(p->fonti);
513 p->fonti--;
514 }
515
516 /*
517 * Handle pwords, partial words, which may be either a single word or a
518 * phrase that cannot be broken down (such as a literal string). This
519 * handles word styling.
520 */
521 void
522 term_word(struct termp *p, const char *word)
523 {
524 struct roffsu su;
525 const char nbrsp[2] = { ASCII_NBRSP, 0 };
526 const char *seq, *cp;
527 int sz, uc;
528 size_t csz, lsz, ssz;
529 enum mandoc_esc esc;
530
531 if ((p->flags & TERMP_NOBUF) == 0) {
532 if ((p->flags & TERMP_NOSPACE) == 0) {
533 if ((p->flags & TERMP_KEEP) == 0) {
534 bufferc(p, ' ');
535 if (p->flags & TERMP_SENTENCE)
536 bufferc(p, ' ');
537 } else
538 bufferc(p, ASCII_NBRSP);
539 }
540 if (p->flags & TERMP_PREKEEP)
541 p->flags |= TERMP_KEEP;
542 if (p->flags & TERMP_NONOSPACE)
543 p->flags |= TERMP_NOSPACE;
544 else
545 p->flags &= ~TERMP_NOSPACE;
546 p->flags &= ~(TERMP_SENTENCE | TERMP_NONEWLINE);
547 p->skipvsp = 0;
548 }
549
550 while ('\0' != *word) {
551 if ('\\' != *word) {
552 if (TERMP_NBRWORD & p->flags) {
553 if (' ' == *word) {
554 encode(p, nbrsp, 1);
555 word++;
556 continue;
557 }
558 ssz = strcspn(word, "\\ ");
559 } else
560 ssz = strcspn(word, "\\");
561 encode(p, word, ssz);
562 word += (int)ssz;
563 continue;
564 }
565
566 word++;
567 esc = mandoc_escape(&word, &seq, &sz);
568 switch (esc) {
569 case ESCAPE_UNICODE:
570 uc = mchars_num2uc(seq + 1, sz - 1);
571 break;
572 case ESCAPE_NUMBERED:
573 uc = mchars_num2char(seq, sz);
574 if (uc < 0)
575 continue;
576 break;
577 case ESCAPE_SPECIAL:
578 if (p->enc == TERMENC_ASCII) {
579 cp = mchars_spec2str(seq, sz, &ssz);
580 if (cp != NULL)
581 encode(p, cp, ssz);
582 } else {
583 uc = mchars_spec2cp(seq, sz);
584 if (uc > 0)
585 encode1(p, uc);
586 }
587 continue;
588 case ESCAPE_UNDEF:
589 uc = *seq;
590 break;
591 case ESCAPE_FONTBOLD:
592 term_fontrepl(p, TERMFONT_BOLD);
593 continue;
594 case ESCAPE_FONTITALIC:
595 term_fontrepl(p, TERMFONT_UNDER);
596 continue;
597 case ESCAPE_FONTBI:
598 term_fontrepl(p, TERMFONT_BI);
599 continue;
600 case ESCAPE_FONT:
601 case ESCAPE_FONTCW:
602 case ESCAPE_FONTROMAN:
603 term_fontrepl(p, TERMFONT_NONE);
604 continue;
605 case ESCAPE_FONTPREV:
606 term_fontlast(p);
607 continue;
608 case ESCAPE_BREAK:
609 bufferc(p, '\n');
610 continue;
611 case ESCAPE_NOSPACE:
612 if (p->flags & TERMP_BACKAFTER)
613 p->flags &= ~TERMP_BACKAFTER;
614 else if (*word == '\0')
615 p->flags |= (TERMP_NOSPACE | TERMP_NONEWLINE);
616 continue;
617 case ESCAPE_DEVICE:
618 if (p->type == TERMTYPE_PDF)
619 encode(p, "pdf", 3);
620 else if (p->type == TERMTYPE_PS)
621 encode(p, "ps", 2);
622 else if (p->enc == TERMENC_ASCII)
623 encode(p, "ascii", 5);
624 else
625 encode(p, "utf8", 4);
626 continue;
627 case ESCAPE_HORIZ:
628 if (*seq == '|') {
629 seq++;
630 uc = -p->col;
631 } else
632 uc = 0;
633 if (a2roffsu(seq, &su, SCALE_EM) == NULL)
634 continue;
635 uc += term_hen(p, &su);
636 if (uc > 0)
637 while (uc-- > 0)
638 bufferc(p, ASCII_NBRSP);
639 else if (p->col > (size_t)(-uc))
640 p->col += uc;
641 else {
642 uc += p->col;
643 p->col = 0;
644 if (p->tcol->offset > (size_t)(-uc)) {
645 p->ti += uc;
646 p->tcol->offset += uc;
647 } else {
648 p->ti -= p->tcol->offset;
649 p->tcol->offset = 0;
650 }
651 }
652 continue;
653 case ESCAPE_HLINE:
654 if ((cp = a2roffsu(seq, &su, SCALE_EM)) == NULL)
655 continue;
656 uc = term_hen(p, &su);
657 if (uc <= 0) {
658 if (p->tcol->rmargin <= p->tcol->offset)
659 continue;
660 lsz = p->tcol->rmargin - p->tcol->offset;
661 } else
662 lsz = uc;
663 if (*cp == seq[-1])
664 uc = -1;
665 else if (*cp == '\\') {
666 seq = cp + 1;
667 esc = mandoc_escape(&seq, &cp, &sz);
668 switch (esc) {
669 case ESCAPE_UNICODE:
670 uc = mchars_num2uc(cp + 1, sz - 1);
671 break;
672 case ESCAPE_NUMBERED:
673 uc = mchars_num2char(cp, sz);
674 break;
675 case ESCAPE_SPECIAL:
676 uc = mchars_spec2cp(cp, sz);
677 break;
678 case ESCAPE_UNDEF:
679 uc = *seq;
680 break;
681 default:
682 uc = -1;
683 break;
684 }
685 } else
686 uc = *cp;
687 if (uc < 0x20 || (uc > 0x7E && uc < 0xA0))
688 uc = '_';
689 if (p->enc == TERMENC_ASCII) {
690 cp = ascii_uc2str(uc);
691 csz = term_strlen(p, cp);
692 ssz = strlen(cp);
693 } else
694 csz = (*p->width)(p, uc);
695 while (lsz >= csz) {
696 if (p->enc == TERMENC_ASCII)
697 encode(p, cp, ssz);
698 else
699 encode1(p, uc);
700 lsz -= csz;
701 }
702 continue;
703 case ESCAPE_SKIPCHAR:
704 p->flags |= TERMP_BACKAFTER;
705 continue;
706 case ESCAPE_OVERSTRIKE:
707 cp = seq + sz;
708 while (seq < cp) {
709 if (*seq == '\\') {
710 mandoc_escape(&seq, NULL, NULL);
711 continue;
712 }
713 encode1(p, *seq++);
714 if (seq < cp) {
715 if (p->flags & TERMP_BACKBEFORE)
716 p->flags |= TERMP_BACKAFTER;
717 else
718 p->flags |= TERMP_BACKBEFORE;
719 }
720 }
721 /* Trim trailing backspace/blank pair. */
722 if (p->tcol->lastcol > 2 &&
723 (p->tcol->buf[p->tcol->lastcol - 1] == ' ' ||
724 p->tcol->buf[p->tcol->lastcol - 1] == '\t'))
725 p->tcol->lastcol -= 2;
726 if (p->col > p->tcol->lastcol)
727 p->col = p->tcol->lastcol;
728 continue;
729 default:
730 continue;
731 }
732
733 /*
734 * Common handling for Unicode and numbered
735 * character escape sequences.
736 */
737
738 if (p->enc == TERMENC_ASCII) {
739 cp = ascii_uc2str(uc);
740 encode(p, cp, strlen(cp));
741 } else {
742 if ((uc < 0x20 && uc != 0x09) ||
743 (uc > 0x7E && uc < 0xA0))
744 uc = 0xFFFD;
745 encode1(p, uc);
746 }
747 }
748 p->flags &= ~TERMP_NBRWORD;
749 }
750
751 static void
752 adjbuf(struct termp_col *c, size_t sz)
753 {
754 if (c->maxcols == 0)
755 c->maxcols = 1024;
756 while (c->maxcols <= sz)
757 c->maxcols <<= 2;
758 c->buf = mandoc_reallocarray(c->buf, c->maxcols, sizeof(*c->buf));
759 }
760
761 static void
762 bufferc(struct termp *p, char c)
763 {
764 if (p->flags & TERMP_NOBUF) {
765 (*p->letter)(p, c);
766 return;
767 }
768 if (p->col + 1 >= p->tcol->maxcols)
769 adjbuf(p->tcol, p->col + 1);
770 if (p->tcol->lastcol <= p->col || (c != ' ' && c != ASCII_NBRSP))
771 p->tcol->buf[p->col] = c;
772 if (p->tcol->lastcol < ++p->col)
773 p->tcol->lastcol = p->col;
774 }
775
776 /*
777 * See encode().
778 * Do this for a single (probably unicode) value.
779 * Does not check for non-decorated glyphs.
780 */
781 static void
782 encode1(struct termp *p, int c)
783 {
784 enum termfont f;
785
786 if (p->flags & TERMP_NOBUF) {
787 (*p->letter)(p, c);
788 return;
789 }
790
791 if (p->col + 7 >= p->tcol->maxcols)
792 adjbuf(p->tcol, p->col + 7);
793
794 f = (c == ASCII_HYPH || c > 127 || isgraph(c)) ?
795 p->fontq[p->fonti] : TERMFONT_NONE;
796
797 if (p->flags & TERMP_BACKBEFORE) {
798 if (p->tcol->buf[p->col - 1] == ' ' ||
799 p->tcol->buf[p->col - 1] == '\t')
800 p->col--;
801 else
802 p->tcol->buf[p->col++] = '\b';
803 p->flags &= ~TERMP_BACKBEFORE;
804 }
805 if (f == TERMFONT_UNDER || f == TERMFONT_BI) {
806 p->tcol->buf[p->col++] = '_';
807 p->tcol->buf[p->col++] = '\b';
808 }
809 if (f == TERMFONT_BOLD || f == TERMFONT_BI) {
810 if (c == ASCII_HYPH)
811 p->tcol->buf[p->col++] = '-';
812 else
813 p->tcol->buf[p->col++] = c;
814 p->tcol->buf[p->col++] = '\b';
815 }
816 if (p->tcol->lastcol <= p->col || (c != ' ' && c != ASCII_NBRSP))
817 p->tcol->buf[p->col] = c;
818 if (p->tcol->lastcol < ++p->col)
819 p->tcol->lastcol = p->col;
820 if (p->flags & TERMP_BACKAFTER) {
821 p->flags |= TERMP_BACKBEFORE;
822 p->flags &= ~TERMP_BACKAFTER;
823 }
824 }
825
826 static void
827 encode(struct termp *p, const char *word, size_t sz)
828 {
829 size_t i;
830
831 if (p->flags & TERMP_NOBUF) {
832 for (i = 0; i < sz; i++)
833 (*p->letter)(p, word[i]);
834 return;
835 }
836
837 if (p->col + 2 + (sz * 5) >= p->tcol->maxcols)
838 adjbuf(p->tcol, p->col + 2 + (sz * 5));
839
840 for (i = 0; i < sz; i++) {
841 if (ASCII_HYPH == word[i] ||
842 isgraph((unsigned char)word[i]))
843 encode1(p, word[i]);
844 else {
845 if (p->tcol->lastcol <= p->col ||
846 (word[i] != ' ' && word[i] != ASCII_NBRSP))
847 p->tcol->buf[p->col] = word[i];
848 p->col++;
849
850 /*
851 * Postpone the effect of \z while handling
852 * an overstrike sequence from ascii_uc2str().
853 */
854
855 if (word[i] == '\b' &&
856 (p->flags & TERMP_BACKBEFORE)) {
857 p->flags &= ~TERMP_BACKBEFORE;
858 p->flags |= TERMP_BACKAFTER;
859 }
860 }
861 }
862 if (p->tcol->lastcol < p->col)
863 p->tcol->lastcol = p->col;
864 }
865
866 void
867 term_setwidth(struct termp *p, const char *wstr)
868 {
869 struct roffsu su;
870 int iop, width;
871
872 iop = 0;
873 width = 0;
874 if (NULL != wstr) {
875 switch (*wstr) {
876 case '+':
877 iop = 1;
878 wstr++;
879 break;
880 case '-':
881 iop = -1;
882 wstr++;
883 break;
884 default:
885 break;
886 }
887 if (a2roffsu(wstr, &su, SCALE_MAX) != NULL)
888 width = term_hspan(p, &su);
889 else
890 iop = 0;
891 }
892 (*p->setwidth)(p, iop, width);
893 }
894
895 size_t
896 term_len(const struct termp *p, size_t sz)
897 {
898
899 return (*p->width)(p, ' ') * sz;
900 }
901
902 static size_t
903 cond_width(const struct termp *p, int c, int *skip)
904 {
905
906 if (*skip) {
907 (*skip) = 0;
908 return 0;
909 } else
910 return (*p->width)(p, c);
911 }
912
913 size_t
914 term_strlen(const struct termp *p, const char *cp)
915 {
916 size_t sz, rsz, i;
917 int ssz, skip, uc;
918 const char *seq, *rhs;
919 enum mandoc_esc esc;
920 static const char rej[] = { '\\', ASCII_NBRSP, ASCII_HYPH,
921 ASCII_BREAK, '\0' };
922
923 /*
924 * Account for escaped sequences within string length
925 * calculations. This follows the logic in term_word() as we
926 * must calculate the width of produced strings.
927 */
928
929 sz = 0;
930 skip = 0;
931 while ('\0' != *cp) {
932 rsz = strcspn(cp, rej);
933 for (i = 0; i < rsz; i++)
934 sz += cond_width(p, *cp++, &skip);
935
936 switch (*cp) {
937 case '\\':
938 cp++;
939 rhs = NULL;
940 esc = mandoc_escape(&cp, &seq, &ssz);
941 switch (esc) {
942 case ESCAPE_UNICODE:
943 uc = mchars_num2uc(seq + 1, ssz - 1);
944 break;
945 case ESCAPE_NUMBERED:
946 uc = mchars_num2char(seq, ssz);
947 if (uc < 0)
948 continue;
949 break;
950 case ESCAPE_SPECIAL:
951 if (p->enc == TERMENC_ASCII) {
952 rhs = mchars_spec2str(seq, ssz, &rsz);
953 if (rhs != NULL)
954 break;
955 } else {
956 uc = mchars_spec2cp(seq, ssz);
957 if (uc > 0)
958 sz += cond_width(p, uc, &skip);
959 }
960 continue;
961 case ESCAPE_UNDEF:
962 uc = *seq;
963 break;
964 case ESCAPE_DEVICE:
965 if (p->type == TERMTYPE_PDF) {
966 rhs = "pdf";
967 rsz = 3;
968 } else if (p->type == TERMTYPE_PS) {
969 rhs = "ps";
970 rsz = 2;
971 } else if (p->enc == TERMENC_ASCII) {
972 rhs = "ascii";
973 rsz = 5;
974 } else {
975 rhs = "utf8";
976 rsz = 4;
977 }
978 break;
979 case ESCAPE_SKIPCHAR:
980 skip = 1;
981 continue;
982 case ESCAPE_OVERSTRIKE:
983 rsz = 0;
984 rhs = seq + ssz;
985 while (seq < rhs) {
986 if (*seq == '\\') {
987 mandoc_escape(&seq, NULL, NULL);
988 continue;
989 }
990 i = (*p->width)(p, *seq++);
991 if (rsz < i)
992 rsz = i;
993 }
994 sz += rsz;
995 continue;
996 default:
997 continue;
998 }
999
1000 /*
1001 * Common handling for Unicode and numbered
1002 * character escape sequences.
1003 */
1004
1005 if (rhs == NULL) {
1006 if (p->enc == TERMENC_ASCII) {
1007 rhs = ascii_uc2str(uc);
1008 rsz = strlen(rhs);
1009 } else {
1010 if ((uc < 0x20 && uc != 0x09) ||
1011 (uc > 0x7E && uc < 0xA0))
1012 uc = 0xFFFD;
1013 sz += cond_width(p, uc, &skip);
1014 continue;
1015 }
1016 }
1017
1018 if (skip) {
1019 skip = 0;
1020 break;
1021 }
1022
1023 /*
1024 * Common handling for all escape sequences
1025 * printing more than one character.
1026 */
1027
1028 for (i = 0; i < rsz; i++)
1029 sz += (*p->width)(p, *rhs++);
1030 break;
1031 case ASCII_NBRSP:
1032 sz += cond_width(p, ' ', &skip);
1033 cp++;
1034 break;
1035 case ASCII_HYPH:
1036 sz += cond_width(p, '-', &skip);
1037 cp++;
1038 break;
1039 default:
1040 break;
1041 }
1042 }
1043
1044 return sz;
1045 }
1046
1047 int
1048 term_vspan(const struct termp *p, const struct roffsu *su)
1049 {
1050 double r;
1051 int ri;
1052
1053 switch (su->unit) {
1054 case SCALE_BU:
1055 r = su->scale / 40.0;
1056 break;
1057 case SCALE_CM:
1058 r = su->scale * 6.0 / 2.54;
1059 break;
1060 case SCALE_FS:
1061 r = su->scale * 65536.0 / 40.0;
1062 break;
1063 case SCALE_IN:
1064 r = su->scale * 6.0;
1065 break;
1066 case SCALE_MM:
1067 r = su->scale * 0.006;
1068 break;
1069 case SCALE_PC:
1070 r = su->scale;
1071 break;
1072 case SCALE_PT:
1073 r = su->scale / 12.0;
1074 break;
1075 case SCALE_EN:
1076 case SCALE_EM:
1077 r = su->scale * 0.6;
1078 break;
1079 case SCALE_VS:
1080 r = su->scale;
1081 break;
1082 default:
1083 abort();
1084 }
1085 ri = r > 0.0 ? r + 0.4995 : r - 0.4995;
1086 return ri < 66 ? ri : 1;
1087 }
1088
1089 /*
1090 * Convert a scaling width to basic units, rounding towards 0.
1091 */
1092 int
1093 term_hspan(const struct termp *p, const struct roffsu *su)
1094 {
1095
1096 return (*p->hspan)(p, su);
1097 }
1098
1099 /*
1100 * Convert a scaling width to basic units, rounding to closest.
1101 */
1102 int
1103 term_hen(const struct termp *p, const struct roffsu *su)
1104 {
1105 int bu;
1106
1107 if ((bu = (*p->hspan)(p, su)) >= 0)
1108 return (bu + 11) / 24;
1109 else
1110 return -((-bu + 11) / 24);
1111 }
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