Annotation of src/usr.bin/mandoc/term.c, Revision 1.53
1.53 ! schwarze 1: /* $Id: term.c,v 1.52 2010/10/01 21:38:26 schwarze Exp $ */
1.1 kristaps 2: /*
1.44 schwarze 3: * Copyright (c) 2008, 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
4: * Copyright (c) 2010 Ingo Schwarze <schwarze@openbsd.org>
1.1 kristaps 5: *
6: * Permission to use, copy, modify, and distribute this software for any
1.2 schwarze 7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
1.1 kristaps 9: *
1.2 schwarze 10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
1.1 kristaps 17: */
1.20 schwarze 18: #include <sys/types.h>
19:
1.1 kristaps 20: #include <assert.h>
1.20 schwarze 21: #include <ctype.h>
1.36 schwarze 22: #include <stdint.h>
1.1 kristaps 23: #include <stdio.h>
24: #include <stdlib.h>
25: #include <string.h>
26:
1.34 schwarze 27: #include "mandoc.h"
1.15 schwarze 28: #include "chars.h"
1.16 schwarze 29: #include "out.h"
1.1 kristaps 30: #include "term.h"
1.16 schwarze 31: #include "main.h"
1.1 kristaps 32:
1.45 schwarze 33: static void spec(struct termp *, enum roffdeco,
34: const char *, size_t);
1.20 schwarze 35: static void res(struct termp *, const char *, size_t);
36: static void bufferc(struct termp *, char);
37: static void adjbuf(struct termp *p, size_t);
38: static void encode(struct termp *, const char *, size_t);
1.1 kristaps 39:
40:
1.37 schwarze 41: void
42: term_free(struct termp *p)
1.1 kristaps 43: {
44:
1.37 schwarze 45: if (p->buf)
46: free(p->buf);
47: if (p->symtab)
48: chars_free(p->symtab);
49:
50: free(p);
1.1 kristaps 51: }
52:
53:
1.13 schwarze 54: void
1.37 schwarze 55: term_begin(struct termp *p, term_margin head,
56: term_margin foot, const void *arg)
1.1 kristaps 57: {
58:
1.37 schwarze 59: p->headf = head;
60: p->footf = foot;
61: p->argf = arg;
62: (*p->begin)(p);
1.1 kristaps 63: }
64:
65:
1.37 schwarze 66: void
67: term_end(struct termp *p)
1.1 kristaps 68: {
69:
1.37 schwarze 70: (*p->end)(p);
1.1 kristaps 71: }
72:
73:
1.37 schwarze 74: struct termp *
75: term_alloc(enum termenc enc)
1.1 kristaps 76: {
1.36 schwarze 77: struct termp *p;
1.1 kristaps 78:
1.19 schwarze 79: p = calloc(1, sizeof(struct termp));
80: if (NULL == p) {
81: perror(NULL);
1.50 schwarze 82: exit((int)MANDOCLEVEL_SYSERR);
1.19 schwarze 83: }
1.36 schwarze 84:
1.1 kristaps 85: p->enc = enc;
86: return(p);
87: }
88:
89:
90: /*
91: * Flush a line of text. A "line" is loosely defined as being something
92: * that should be followed by a newline, regardless of whether it's
93: * broken apart by newlines getting there. A line can also be a
1.27 schwarze 94: * fragment of a columnar list (`Bl -tag' or `Bl -column'), which does
95: * not have a trailing newline.
1.1 kristaps 96: *
1.27 schwarze 97: * The following flags may be specified:
1.1 kristaps 98: *
99: * - TERMP_NOLPAD: when beginning to write the line, don't left-pad the
100: * offset value. This is useful when doing columnar lists where the
101: * prior column has right-padded.
102: *
103: * - TERMP_NOBREAK: this is the most important and is used when making
104: * columns. In short: don't print a newline and instead pad to the
105: * right margin. Used in conjunction with TERMP_NOLPAD.
106: *
1.9 schwarze 107: * - TERMP_TWOSPACE: when padding, make sure there are at least two
108: * space characters of padding. Otherwise, rather break the line.
109: *
1.6 schwarze 110: * - TERMP_DANGLE: don't newline when TERMP_NOBREAK is specified and
111: * the line is overrun, and don't pad-right if it's underrun.
112: *
113: * - TERMP_HANG: like TERMP_DANGLE, but doesn't newline when
114: * overruning, instead save the position and continue at that point
115: * when the next invocation.
1.1 kristaps 116: *
117: * In-line line breaking:
118: *
119: * If TERMP_NOBREAK is specified and the line overruns the right
120: * margin, it will break and pad-right to the right margin after
121: * writing. If maxrmargin is violated, it will break and continue
1.19 schwarze 122: * writing from the right-margin, which will lead to the above scenario
123: * upon exit. Otherwise, the line will break at the right margin.
1.1 kristaps 124: */
125: void
126: term_flushln(struct termp *p)
127: {
1.19 schwarze 128: int i; /* current input position in p->buf */
129: size_t vis; /* current visual position on output */
130: size_t vbl; /* number of blanks to prepend to output */
1.33 schwarze 131: size_t vend; /* end of word visual position on output */
1.19 schwarze 132: size_t bp; /* visual right border position */
1.51 schwarze 133: size_t dv; /* temporary for visual pos calculations */
1.42 schwarze 134: int j; /* temporary loop index for p->buf */
135: int jhy; /* last hyph before overflow w/r/t j */
136: size_t maxvis; /* output position of visible boundary */
137: size_t mmax; /* used in calculating bp */
1.1 kristaps 138:
139: /*
140: * First, establish the maximum columns of "visible" content.
141: * This is usually the difference between the right-margin and
142: * an indentation, but can be, for tagged lists or columns, a
1.19 schwarze 143: * small set of values.
1.1 kristaps 144: */
1.53 ! schwarze 145: assert (p->rmargin > p->offset);
! 146: dv = p->rmargin - p->offset;
! 147: maxvis = (int)dv > p->overstep ? dv - (size_t)p->overstep : 0;
! 148: dv = p->maxrmargin - p->offset;
! 149: mmax = (int)dv > p->overstep ? dv - (size_t)p->overstep : 0;
1.9 schwarze 150:
1.1 kristaps 151: bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
1.19 schwarze 152:
1.33 schwarze 153: /*
154: * Indent the first line of a paragraph.
155: */
1.53 ! schwarze 156: vbl = p->flags & TERMP_NOLPAD ? (size_t)0 : p->offset;
1.33 schwarze 157:
1.53 ! schwarze 158: vis = vend = 0;
! 159: i = 0;
1.19 schwarze 160:
1.22 schwarze 161: while (i < (int)p->col) {
162: /*
1.42 schwarze 163: * Handle literal tab characters: collapse all
164: * subsequent tabs into a single huge set of spaces.
1.30 schwarze 165: */
1.49 schwarze 166: while (i < (int)p->col && '\t' == p->buf[i]) {
1.42 schwarze 167: vend = (vis / p->tabwidth + 1) * p->tabwidth;
1.30 schwarze 168: vbl += vend - vis;
169: vis = vend;
1.49 schwarze 170: i++;
1.30 schwarze 171: }
1.22 schwarze 172:
1.1 kristaps 173: /*
174: * Count up visible word characters. Control sequences
175: * (starting with the CSI) aren't counted. A space
176: * generates a non-printing word, which is valid (the
177: * space is printed according to regular spacing rules).
178: */
179:
1.49 schwarze 180: for (j = i, jhy = 0; j < (int)p->col; j++) {
1.30 schwarze 181: if ((j && ' ' == p->buf[j]) || '\t' == p->buf[j])
1.1 kristaps 182: break;
1.42 schwarze 183:
184: /* Back over the the last printed character. */
185: if (8 == p->buf[j]) {
186: assert(j);
187: vend -= (*p->width)(p, p->buf[j - 1]);
188: continue;
189: }
190:
191: /* Regular word. */
192: /* Break at the hyphen point if we overrun. */
193: if (vend > vis && vend < bp &&
194: ASCII_HYPH == p->buf[j])
195: jhy = j;
196:
197: vend += (*p->width)(p, p->buf[j]);
1.1 kristaps 198: }
199:
200: /*
1.5 schwarze 201: * Find out whether we would exceed the right margin.
1.33 schwarze 202: * If so, break to the next line.
1.5 schwarze 203: */
1.33 schwarze 204: if (vend > bp && 0 == jhy && vis > 0) {
1.22 schwarze 205: vend -= vis;
1.37 schwarze 206: (*p->endline)(p);
1.5 schwarze 207: if (TERMP_NOBREAK & p->flags) {
1.29 schwarze 208: p->viscol = p->rmargin;
1.37 schwarze 209: (*p->advance)(p, p->rmargin);
1.22 schwarze 210: vend += p->rmargin - p->offset;
1.5 schwarze 211: } else {
1.33 schwarze 212: p->viscol = 0;
213: vbl = p->offset;
1.5 schwarze 214: }
1.33 schwarze 215:
1.26 schwarze 216: /* Remove the p->overstep width. */
1.33 schwarze 217:
1.53 ! schwarze 218: bp += (size_t)p->overstep;
1.26 schwarze 219: p->overstep = 0;
1.1 kristaps 220: }
1.30 schwarze 221:
1.33 schwarze 222: /* Write out the [remaining] word. */
1.1 kristaps 223: for ( ; i < (int)p->col; i++) {
1.25 schwarze 224: if (vend > bp && jhy > 0 && i > jhy)
1.30 schwarze 225: break;
226: if ('\t' == p->buf[i])
1.1 kristaps 227: break;
1.22 schwarze 228: if (' ' == p->buf[i]) {
1.46 schwarze 229: j = i;
230: while (' ' == p->buf[i])
1.33 schwarze 231: i++;
1.53 ! schwarze 232: dv = (size_t)(i - j) * (*p->width)(p, ' ');
1.51 schwarze 233: vbl += dv;
234: vend += dv;
1.22 schwarze 235: break;
236: }
1.33 schwarze 237: if (ASCII_NBRSP == p->buf[i]) {
1.42 schwarze 238: vbl += (*p->width)(p, ' ');
1.33 schwarze 239: continue;
240: }
241:
242: /*
243: * Now we definitely know there will be
244: * printable characters to output,
245: * so write preceding white space now.
246: */
247: if (vbl) {
1.37 schwarze 248: (*p->advance)(p, vbl);
1.33 schwarze 249: p->viscol += vbl;
250: vbl = 0;
251: }
1.35 schwarze 252:
1.42 schwarze 253: if (ASCII_HYPH == p->buf[i]) {
1.37 schwarze 254: (*p->letter)(p, '-');
1.42 schwarze 255: p->viscol += (*p->width)(p, '-');
256: } else {
1.37 schwarze 257: (*p->letter)(p, p->buf[i]);
1.42 schwarze 258: p->viscol += (*p->width)(p, p->buf[i]);
259: }
1.1 kristaps 260: }
1.22 schwarze 261: vis = vend;
1.1 kristaps 262: }
1.48 schwarze 263:
264: /*
265: * If there was trailing white space, it was not printed;
266: * so reset the cursor position accordingly.
267: */
268: vis -= vbl;
1.18 schwarze 269:
1.9 schwarze 270: p->col = 0;
1.26 schwarze 271: p->overstep = 0;
1.1 kristaps 272:
1.9 schwarze 273: if ( ! (TERMP_NOBREAK & p->flags)) {
1.29 schwarze 274: p->viscol = 0;
1.37 schwarze 275: (*p->endline)(p);
1.1 kristaps 276: return;
277: }
278:
1.9 schwarze 279: if (TERMP_HANG & p->flags) {
280: /* We need one blank after the tag. */
1.53 ! schwarze 281: p->overstep = (int)(vis - maxvis + (*p->width)(p, ' '));
1.9 schwarze 282:
283: /*
284: * Behave exactly the same way as groff:
285: * If we have overstepped the margin, temporarily move
286: * it to the right and flag the rest of the line to be
287: * shorter.
288: * If we landed right at the margin, be happy.
289: * If we are one step before the margin, temporarily
290: * move it one step LEFT and flag the rest of the line
291: * to be longer.
292: */
1.26 schwarze 293: if (p->overstep >= -1) {
294: assert((int)maxvis + p->overstep >= 0);
1.53 ! schwarze 295: maxvis += (size_t)p->overstep;
1.9 schwarze 296: } else
1.26 schwarze 297: p->overstep = 0;
1.9 schwarze 298:
299: } else if (TERMP_DANGLE & p->flags)
300: return;
1.1 kristaps 301:
1.9 schwarze 302: /* Right-pad. */
1.53 ! schwarze 303: if (maxvis > vis +
! 304: ((TERMP_TWOSPACE & p->flags) ? (*p->width)(p, ' ') : 0)) {
1.29 schwarze 305: p->viscol += maxvis - vis;
1.37 schwarze 306: (*p->advance)(p, maxvis - vis);
307: vis += (maxvis - vis);
1.29 schwarze 308: } else { /* ...or newline break. */
1.37 schwarze 309: (*p->endline)(p);
1.29 schwarze 310: p->viscol = p->rmargin;
1.37 schwarze 311: (*p->advance)(p, p->rmargin);
1.9 schwarze 312: }
1.1 kristaps 313: }
314:
315:
316: /*
317: * A newline only breaks an existing line; it won't assert vertical
318: * space. All data in the output buffer is flushed prior to the newline
319: * assertion.
320: */
321: void
322: term_newln(struct termp *p)
323: {
324:
325: p->flags |= TERMP_NOSPACE;
1.29 schwarze 326: if (0 == p->col && 0 == p->viscol) {
1.1 kristaps 327: p->flags &= ~TERMP_NOLPAD;
328: return;
329: }
330: term_flushln(p);
331: p->flags &= ~TERMP_NOLPAD;
332: }
333:
334:
335: /*
336: * Asserts a vertical space (a full, empty line-break between lines).
337: * Note that if used twice, this will cause two blank spaces and so on.
338: * All data in the output buffer is flushed prior to the newline
339: * assertion.
340: */
341: void
342: term_vspace(struct termp *p)
343: {
344:
345: term_newln(p);
1.29 schwarze 346: p->viscol = 0;
1.37 schwarze 347: (*p->endline)(p);
1.1 kristaps 348: }
349:
350:
351: static void
1.45 schwarze 352: spec(struct termp *p, enum roffdeco d, const char *word, size_t len)
1.1 kristaps 353: {
354: const char *rhs;
355: size_t sz;
356:
1.45 schwarze 357: rhs = chars_spec2str(p->symtab, word, len, &sz);
1.20 schwarze 358: if (rhs)
359: encode(p, rhs, sz);
1.45 schwarze 360: else if (DECO_SSPECIAL == d)
361: encode(p, word, len);
1.11 schwarze 362: }
363:
364:
365: static void
1.20 schwarze 366: res(struct termp *p, const char *word, size_t len)
1.11 schwarze 367: {
368: const char *rhs;
369: size_t sz;
370:
1.45 schwarze 371: rhs = chars_res2str(p->symtab, word, len, &sz);
1.20 schwarze 372: if (rhs)
373: encode(p, rhs, sz);
374: }
375:
376:
377: void
378: term_fontlast(struct termp *p)
379: {
380: enum termfont f;
1.11 schwarze 381:
1.20 schwarze 382: f = p->fontl;
383: p->fontl = p->fontq[p->fonti];
384: p->fontq[p->fonti] = f;
385: }
386:
387:
388: void
389: term_fontrepl(struct termp *p, enum termfont f)
390: {
391:
392: p->fontl = p->fontq[p->fonti];
393: p->fontq[p->fonti] = f;
1.1 kristaps 394: }
395:
396:
1.20 schwarze 397: void
398: term_fontpush(struct termp *p, enum termfont f)
1.1 kristaps 399: {
1.7 schwarze 400:
1.20 schwarze 401: assert(p->fonti + 1 < 10);
402: p->fontl = p->fontq[p->fonti];
403: p->fontq[++p->fonti] = f;
404: }
1.1 kristaps 405:
406:
1.20 schwarze 407: const void *
408: term_fontq(struct termp *p)
409: {
1.1 kristaps 410:
1.20 schwarze 411: return(&p->fontq[p->fonti]);
412: }
1.1 kristaps 413:
414:
1.20 schwarze 415: enum termfont
416: term_fonttop(struct termp *p)
417: {
1.1 kristaps 418:
1.20 schwarze 419: return(p->fontq[p->fonti]);
420: }
1.7 schwarze 421:
422:
1.20 schwarze 423: void
424: term_fontpopq(struct termp *p, const void *key)
425: {
1.1 kristaps 426:
1.20 schwarze 427: while (p->fonti >= 0 && key != &p->fontq[p->fonti])
428: p->fonti--;
429: assert(p->fonti >= 0);
430: }
1.1 kristaps 431:
432:
1.20 schwarze 433: void
434: term_fontpop(struct termp *p)
435: {
1.1 kristaps 436:
1.20 schwarze 437: assert(p->fonti);
438: p->fonti--;
1.1 kristaps 439: }
440:
441:
442: /*
443: * Handle pwords, partial words, which may be either a single word or a
444: * phrase that cannot be broken down (such as a literal string). This
445: * handles word styling.
446: */
1.7 schwarze 447: void
448: term_word(struct termp *p, const char *word)
1.1 kristaps 449: {
1.20 schwarze 450: const char *sv, *seq;
451: size_t ssz;
452: enum roffdeco deco;
1.1 kristaps 453:
1.14 schwarze 454: sv = word;
455:
1.20 schwarze 456: if (word[0] && '\0' == word[1])
1.14 schwarze 457: switch (word[0]) {
458: case('.'):
459: /* FALLTHROUGH */
460: case(','):
461: /* FALLTHROUGH */
462: case(';'):
463: /* FALLTHROUGH */
464: case(':'):
465: /* FALLTHROUGH */
466: case('?'):
467: /* FALLTHROUGH */
468: case('!'):
469: /* FALLTHROUGH */
470: case(')'):
471: /* FALLTHROUGH */
472: case(']'):
473: if ( ! (TERMP_IGNDELIM & p->flags))
474: p->flags |= TERMP_NOSPACE;
475: break;
476: default:
477: break;
478: }
1.1 kristaps 479:
1.31 schwarze 480: if ( ! (TERMP_NOSPACE & p->flags)) {
1.40 schwarze 481: if ( ! (TERMP_KEEP & p->flags)) {
482: if (TERMP_PREKEEP & p->flags)
483: p->flags |= TERMP_KEEP;
1.31 schwarze 484: bufferc(p, ' ');
1.40 schwarze 485: if (TERMP_SENTENCE & p->flags)
486: bufferc(p, ' ');
487: } else
488: bufferc(p, ASCII_NBRSP);
1.31 schwarze 489: }
1.1 kristaps 490:
491: if ( ! (p->flags & TERMP_NONOSPACE))
492: p->flags &= ~TERMP_NOSPACE;
1.46 schwarze 493: else
494: p->flags |= TERMP_NOSPACE;
1.1 kristaps 495:
1.52 schwarze 496: p->flags &= ~(TERMP_SENTENCE | TERMP_IGNDELIM);
1.31 schwarze 497:
1.45 schwarze 498: while (*word) {
499: if ((ssz = strcspn(word, "\\")) > 0)
500: encode(p, word, ssz);
1.20 schwarze 501:
1.45 schwarze 502: word += ssz;
503: if ('\\' != *word)
1.20 schwarze 504: continue;
505:
506: seq = ++word;
1.50 schwarze 507: word += a2roffdeco(&deco, &seq, &ssz);
1.20 schwarze 508:
509: switch (deco) {
510: case (DECO_RESERVED):
511: res(p, seq, ssz);
512: break;
513: case (DECO_SPECIAL):
1.45 schwarze 514: /* FALLTHROUGH */
515: case (DECO_SSPECIAL):
516: spec(p, deco, seq, ssz);
1.20 schwarze 517: break;
518: case (DECO_BOLD):
519: term_fontrepl(p, TERMFONT_BOLD);
520: break;
521: case (DECO_ITALIC):
522: term_fontrepl(p, TERMFONT_UNDER);
523: break;
524: case (DECO_ROMAN):
525: term_fontrepl(p, TERMFONT_NONE);
526: break;
527: case (DECO_PREVIOUS):
528: term_fontlast(p);
529: break;
530: default:
531: break;
532: }
533:
534: if (DECO_NOSPACE == deco && '\0' == *word)
535: p->flags |= TERMP_NOSPACE;
536: }
1.1 kristaps 537:
1.31 schwarze 538: /*
539: * Note that we don't process the pipe: the parser sees it as
540: * punctuation, but we don't in terms of typography.
541: */
1.45 schwarze 542: if (sv[0] && '\0' == sv[1])
1.14 schwarze 543: switch (sv[0]) {
544: case('('):
545: /* FALLTHROUGH */
546: case('['):
547: p->flags |= TERMP_NOSPACE;
548: break;
549: default:
550: break;
551: }
1.1 kristaps 552: }
553:
554:
555: static void
1.20 schwarze 556: adjbuf(struct termp *p, size_t sz)
1.1 kristaps 557: {
558:
1.20 schwarze 559: if (0 == p->maxcols)
560: p->maxcols = 1024;
561: while (sz >= p->maxcols)
562: p->maxcols <<= 2;
563:
564: p->buf = realloc(p->buf, p->maxcols);
565: if (NULL == p->buf) {
566: perror(NULL);
1.50 schwarze 567: exit((int)MANDOCLEVEL_SYSERR);
1.1 kristaps 568: }
569: }
570:
1.4 schwarze 571:
572: static void
1.20 schwarze 573: bufferc(struct termp *p, char c)
574: {
575:
576: if (p->col + 1 >= p->maxcols)
577: adjbuf(p, p->col + 1);
578:
579: p->buf[(int)p->col++] = c;
580: }
581:
582:
583: static void
584: encode(struct termp *p, const char *word, size_t sz)
1.4 schwarze 585: {
1.20 schwarze 586: enum termfont f;
587: int i;
588:
589: /*
590: * Encode and buffer a string of characters. If the current
591: * font mode is unset, buffer directly, else encode then buffer
592: * character by character.
593: */
594:
1.38 schwarze 595: if (TERMFONT_NONE == (f = term_fonttop(p))) {
1.46 schwarze 596: if (p->col + sz >= p->maxcols)
597: adjbuf(p, p->col + sz);
598: memcpy(&p->buf[(int)p->col], word, sz);
599: p->col += sz;
1.20 schwarze 600: return;
601: }
602:
1.46 schwarze 603: /* Pre-buffer, assuming worst-case. */
604:
605: if (p->col + 1 + (sz * 3) >= p->maxcols)
606: adjbuf(p, p->col + 1 + (sz * 3));
607:
1.20 schwarze 608: for (i = 0; i < (int)sz; i++) {
609: if ( ! isgraph((u_char)word[i])) {
1.46 schwarze 610: p->buf[(int)p->col++] = word[i];
1.20 schwarze 611: continue;
1.4 schwarze 612: }
1.20 schwarze 613:
614: if (TERMFONT_UNDER == f)
1.46 schwarze 615: p->buf[(int)p->col++] = '_';
1.20 schwarze 616: else
1.46 schwarze 617: p->buf[(int)p->col++] = word[i];
1.20 schwarze 618:
1.46 schwarze 619: p->buf[(int)p->col++] = 8;
620: p->buf[(int)p->col++] = word[i];
1.4 schwarze 621: }
622: }
1.16 schwarze 623:
624:
625: size_t
1.39 schwarze 626: term_len(const struct termp *p, size_t sz)
627: {
628:
629: return((*p->width)(p, ' ') * sz);
630: }
631:
632:
633: size_t
634: term_strlen(const struct termp *p, const char *cp)
635: {
1.50 schwarze 636: size_t sz, ssz, rsz, i;
637: enum roffdeco d;
638: const char *seq, *rhs;
639:
640: for (sz = 0; '\0' != *cp; )
641: /*
642: * Account for escaped sequences within string length
643: * calculations. This follows the logic in term_word()
644: * as we must calculate the width of produced strings.
645: */
646: if ('\\' == *cp) {
647: seq = ++cp;
648: cp += a2roffdeco(&d, &seq, &ssz);
649:
650: switch (d) {
651: case (DECO_RESERVED):
652: rhs = chars_res2str
653: (p->symtab, seq, ssz, &rsz);
654: break;
655: case (DECO_SPECIAL):
656: /* FALLTHROUGH */
657: case (DECO_SSPECIAL):
658: rhs = chars_spec2str
659: (p->symtab, seq, ssz, &rsz);
660:
661: /* Allow for one-char escapes. */
662: if (DECO_SSPECIAL != d || rhs)
663: break;
664:
665: rhs = seq;
666: rsz = ssz;
667: break;
668: default:
669: rhs = NULL;
670: break;
671: }
1.39 schwarze 672:
1.50 schwarze 673: if (rhs)
674: for (i = 0; i < rsz; i++)
675: sz += (*p->width)(p, *rhs++);
676: } else
677: sz += (*p->width)(p, *cp++);
1.39 schwarze 678:
679: return(sz);
680: }
681:
682:
1.44 schwarze 683: /* ARGSUSED */
1.39 schwarze 684: size_t
685: term_vspan(const struct termp *p, const struct roffsu *su)
1.16 schwarze 686: {
687: double r;
688:
689: switch (su->unit) {
690: case (SCALE_CM):
691: r = su->scale * 2;
692: break;
693: case (SCALE_IN):
694: r = su->scale * 6;
695: break;
696: case (SCALE_PC):
697: r = su->scale;
698: break;
699: case (SCALE_PT):
700: r = su->scale / 8;
701: break;
702: case (SCALE_MM):
703: r = su->scale / 1000;
704: break;
705: case (SCALE_VS):
706: r = su->scale;
707: break;
708: default:
709: r = su->scale - 1;
710: break;
711: }
712:
713: if (r < 0.0)
714: r = 0.0;
715: return(/* LINTED */(size_t)
716: r);
717: }
718:
719:
720: size_t
1.39 schwarze 721: term_hspan(const struct termp *p, const struct roffsu *su)
1.16 schwarze 722: {
1.44 schwarze 723: double v;
1.16 schwarze 724:
1.44 schwarze 725: v = ((*p->hspan)(p, su));
726: if (v < 0.0)
727: v = 0.0;
728: return((size_t) /* LINTED */
729: v);
1.16 schwarze 730: }
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