Annotation of src/usr.bin/mandoc/term.c, Revision 1.52
1.52 ! schwarze 1: /* $Id: term.c,v 1.51 2010/09/23 20:22:31 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: */
145:
146: assert(p->offset < p->rmargin);
1.9 schwarze 147:
1.26 schwarze 148: maxvis = (int)(p->rmargin - p->offset) - p->overstep < 0 ?
1.19 schwarze 149: /* LINTED */
1.26 schwarze 150: 0 : p->rmargin - p->offset - p->overstep;
151: mmax = (int)(p->maxrmargin - p->offset) - p->overstep < 0 ?
1.19 schwarze 152: /* LINTED */
1.26 schwarze 153: 0 : p->maxrmargin - p->offset - p->overstep;
1.9 schwarze 154:
1.1 kristaps 155: bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
1.19 schwarze 156:
1.33 schwarze 157: /*
158: * Indent the first line of a paragraph.
159: */
160: vbl = p->flags & TERMP_NOLPAD ? 0 : p->offset;
161:
1.42 schwarze 162: vis = vend = i = 0;
1.19 schwarze 163:
1.22 schwarze 164: while (i < (int)p->col) {
165: /*
1.42 schwarze 166: * Handle literal tab characters: collapse all
167: * subsequent tabs into a single huge set of spaces.
1.30 schwarze 168: */
1.49 schwarze 169: while (i < (int)p->col && '\t' == p->buf[i]) {
1.42 schwarze 170: vend = (vis / p->tabwidth + 1) * p->tabwidth;
1.30 schwarze 171: vbl += vend - vis;
172: vis = vend;
1.49 schwarze 173: i++;
1.30 schwarze 174: }
1.22 schwarze 175:
1.1 kristaps 176: /*
177: * Count up visible word characters. Control sequences
178: * (starting with the CSI) aren't counted. A space
179: * generates a non-printing word, which is valid (the
180: * space is printed according to regular spacing rules).
181: */
182:
183: /* LINTED */
1.49 schwarze 184: for (j = i, jhy = 0; j < (int)p->col; j++) {
1.30 schwarze 185: if ((j && ' ' == p->buf[j]) || '\t' == p->buf[j])
1.1 kristaps 186: break;
1.42 schwarze 187:
188: /* Back over the the last printed character. */
189: if (8 == p->buf[j]) {
190: assert(j);
191: vend -= (*p->width)(p, p->buf[j - 1]);
192: continue;
193: }
194:
195: /* Regular word. */
196: /* Break at the hyphen point if we overrun. */
197: if (vend > vis && vend < bp &&
198: ASCII_HYPH == p->buf[j])
199: jhy = j;
200:
201: vend += (*p->width)(p, p->buf[j]);
1.1 kristaps 202: }
203:
204: /*
1.5 schwarze 205: * Find out whether we would exceed the right margin.
1.33 schwarze 206: * If so, break to the next line.
1.5 schwarze 207: */
1.33 schwarze 208: if (vend > bp && 0 == jhy && vis > 0) {
1.22 schwarze 209: vend -= vis;
1.37 schwarze 210: (*p->endline)(p);
1.5 schwarze 211: if (TERMP_NOBREAK & p->flags) {
1.29 schwarze 212: p->viscol = p->rmargin;
1.37 schwarze 213: (*p->advance)(p, p->rmargin);
1.22 schwarze 214: vend += p->rmargin - p->offset;
1.5 schwarze 215: } else {
1.33 schwarze 216: p->viscol = 0;
217: vbl = p->offset;
1.5 schwarze 218: }
1.33 schwarze 219:
1.26 schwarze 220: /* Remove the p->overstep width. */
1.33 schwarze 221:
1.18 schwarze 222: bp += (int)/* LINTED */
1.26 schwarze 223: p->overstep;
224: p->overstep = 0;
1.1 kristaps 225: }
1.30 schwarze 226:
1.33 schwarze 227: /* Write out the [remaining] word. */
1.1 kristaps 228: for ( ; i < (int)p->col; i++) {
1.25 schwarze 229: if (vend > bp && jhy > 0 && i > jhy)
1.30 schwarze 230: break;
231: if ('\t' == p->buf[i])
1.1 kristaps 232: break;
1.22 schwarze 233: if (' ' == p->buf[i]) {
1.46 schwarze 234: j = i;
235: while (' ' == p->buf[i])
1.33 schwarze 236: i++;
1.51 schwarze 237: dv = (i - j) * (*p->width)(p, ' ');
238: vbl += dv;
239: vend += dv;
1.22 schwarze 240: break;
241: }
1.33 schwarze 242: if (ASCII_NBRSP == p->buf[i]) {
1.42 schwarze 243: vbl += (*p->width)(p, ' ');
1.33 schwarze 244: continue;
245: }
246:
247: /*
248: * Now we definitely know there will be
249: * printable characters to output,
250: * so write preceding white space now.
251: */
252: if (vbl) {
1.37 schwarze 253: (*p->advance)(p, vbl);
1.33 schwarze 254: p->viscol += vbl;
255: vbl = 0;
256: }
1.35 schwarze 257:
1.42 schwarze 258: if (ASCII_HYPH == p->buf[i]) {
1.37 schwarze 259: (*p->letter)(p, '-');
1.42 schwarze 260: p->viscol += (*p->width)(p, '-');
261: } else {
1.37 schwarze 262: (*p->letter)(p, p->buf[i]);
1.42 schwarze 263: p->viscol += (*p->width)(p, p->buf[i]);
264: }
1.1 kristaps 265: }
1.22 schwarze 266: vis = vend;
1.1 kristaps 267: }
1.48 schwarze 268:
269: /*
270: * If there was trailing white space, it was not printed;
271: * so reset the cursor position accordingly.
272: */
273: vis -= vbl;
1.18 schwarze 274:
1.9 schwarze 275: p->col = 0;
1.26 schwarze 276: p->overstep = 0;
1.1 kristaps 277:
1.9 schwarze 278: if ( ! (TERMP_NOBREAK & p->flags)) {
1.29 schwarze 279: p->viscol = 0;
1.37 schwarze 280: (*p->endline)(p);
1.1 kristaps 281: return;
282: }
283:
1.9 schwarze 284: if (TERMP_HANG & p->flags) {
285: /* We need one blank after the tag. */
1.26 schwarze 286: p->overstep = /* LINTED */
1.42 schwarze 287: vis - maxvis + (*p->width)(p, ' ');
1.9 schwarze 288:
289: /*
290: * Behave exactly the same way as groff:
291: * If we have overstepped the margin, temporarily move
292: * it to the right and flag the rest of the line to be
293: * shorter.
294: * If we landed right at the margin, be happy.
295: * If we are one step before the margin, temporarily
296: * move it one step LEFT and flag the rest of the line
297: * to be longer.
298: */
1.26 schwarze 299: if (p->overstep >= -1) {
300: assert((int)maxvis + p->overstep >= 0);
1.9 schwarze 301: /* LINTED */
1.26 schwarze 302: maxvis += p->overstep;
1.9 schwarze 303: } else
1.26 schwarze 304: p->overstep = 0;
1.9 schwarze 305:
306: } else if (TERMP_DANGLE & p->flags)
307: return;
1.1 kristaps 308:
1.9 schwarze 309: /* Right-pad. */
310: if (maxvis > vis + /* LINTED */
1.42 schwarze 311: ((TERMP_TWOSPACE & p->flags) ?
312: (*p->width)(p, ' ') : 0)) {
1.29 schwarze 313: p->viscol += maxvis - vis;
1.37 schwarze 314: (*p->advance)(p, maxvis - vis);
315: vis += (maxvis - vis);
1.29 schwarze 316: } else { /* ...or newline break. */
1.37 schwarze 317: (*p->endline)(p);
1.29 schwarze 318: p->viscol = p->rmargin;
1.37 schwarze 319: (*p->advance)(p, p->rmargin);
1.9 schwarze 320: }
1.1 kristaps 321: }
322:
323:
324: /*
325: * A newline only breaks an existing line; it won't assert vertical
326: * space. All data in the output buffer is flushed prior to the newline
327: * assertion.
328: */
329: void
330: term_newln(struct termp *p)
331: {
332:
333: p->flags |= TERMP_NOSPACE;
1.29 schwarze 334: if (0 == p->col && 0 == p->viscol) {
1.1 kristaps 335: p->flags &= ~TERMP_NOLPAD;
336: return;
337: }
338: term_flushln(p);
339: p->flags &= ~TERMP_NOLPAD;
340: }
341:
342:
343: /*
344: * Asserts a vertical space (a full, empty line-break between lines).
345: * Note that if used twice, this will cause two blank spaces and so on.
346: * All data in the output buffer is flushed prior to the newline
347: * assertion.
348: */
349: void
350: term_vspace(struct termp *p)
351: {
352:
353: term_newln(p);
1.29 schwarze 354: p->viscol = 0;
1.37 schwarze 355: (*p->endline)(p);
1.1 kristaps 356: }
357:
358:
359: static void
1.45 schwarze 360: spec(struct termp *p, enum roffdeco d, const char *word, size_t len)
1.1 kristaps 361: {
362: const char *rhs;
363: size_t sz;
364:
1.45 schwarze 365: rhs = chars_spec2str(p->symtab, word, len, &sz);
1.20 schwarze 366: if (rhs)
367: encode(p, rhs, sz);
1.45 schwarze 368: else if (DECO_SSPECIAL == d)
369: encode(p, word, len);
1.11 schwarze 370: }
371:
372:
373: static void
1.20 schwarze 374: res(struct termp *p, const char *word, size_t len)
1.11 schwarze 375: {
376: const char *rhs;
377: size_t sz;
378:
1.45 schwarze 379: rhs = chars_res2str(p->symtab, word, len, &sz);
1.20 schwarze 380: if (rhs)
381: encode(p, rhs, sz);
382: }
383:
384:
385: void
386: term_fontlast(struct termp *p)
387: {
388: enum termfont f;
1.11 schwarze 389:
1.20 schwarze 390: f = p->fontl;
391: p->fontl = p->fontq[p->fonti];
392: p->fontq[p->fonti] = f;
393: }
394:
395:
396: void
397: term_fontrepl(struct termp *p, enum termfont f)
398: {
399:
400: p->fontl = p->fontq[p->fonti];
401: p->fontq[p->fonti] = f;
1.1 kristaps 402: }
403:
404:
1.20 schwarze 405: void
406: term_fontpush(struct termp *p, enum termfont f)
1.1 kristaps 407: {
1.7 schwarze 408:
1.20 schwarze 409: assert(p->fonti + 1 < 10);
410: p->fontl = p->fontq[p->fonti];
411: p->fontq[++p->fonti] = f;
412: }
1.1 kristaps 413:
414:
1.20 schwarze 415: const void *
416: term_fontq(struct termp *p)
417: {
1.1 kristaps 418:
1.20 schwarze 419: return(&p->fontq[p->fonti]);
420: }
1.1 kristaps 421:
422:
1.20 schwarze 423: enum termfont
424: term_fonttop(struct termp *p)
425: {
1.1 kristaps 426:
1.20 schwarze 427: return(p->fontq[p->fonti]);
428: }
1.7 schwarze 429:
430:
1.20 schwarze 431: void
432: term_fontpopq(struct termp *p, const void *key)
433: {
1.1 kristaps 434:
1.20 schwarze 435: while (p->fonti >= 0 && key != &p->fontq[p->fonti])
436: p->fonti--;
437: assert(p->fonti >= 0);
438: }
1.1 kristaps 439:
440:
1.20 schwarze 441: void
442: term_fontpop(struct termp *p)
443: {
1.1 kristaps 444:
1.20 schwarze 445: assert(p->fonti);
446: p->fonti--;
1.1 kristaps 447: }
448:
449:
450: /*
451: * Handle pwords, partial words, which may be either a single word or a
452: * phrase that cannot be broken down (such as a literal string). This
453: * handles word styling.
454: */
1.7 schwarze 455: void
456: term_word(struct termp *p, const char *word)
1.1 kristaps 457: {
1.20 schwarze 458: const char *sv, *seq;
459: size_t ssz;
460: enum roffdeco deco;
1.1 kristaps 461:
1.14 schwarze 462: sv = word;
463:
1.20 schwarze 464: if (word[0] && '\0' == word[1])
1.14 schwarze 465: switch (word[0]) {
466: case('.'):
467: /* FALLTHROUGH */
468: case(','):
469: /* FALLTHROUGH */
470: case(';'):
471: /* FALLTHROUGH */
472: case(':'):
473: /* FALLTHROUGH */
474: case('?'):
475: /* FALLTHROUGH */
476: case('!'):
477: /* FALLTHROUGH */
478: case(')'):
479: /* FALLTHROUGH */
480: case(']'):
481: if ( ! (TERMP_IGNDELIM & p->flags))
482: p->flags |= TERMP_NOSPACE;
483: break;
484: default:
485: break;
486: }
1.1 kristaps 487:
1.31 schwarze 488: if ( ! (TERMP_NOSPACE & p->flags)) {
1.40 schwarze 489: if ( ! (TERMP_KEEP & p->flags)) {
490: if (TERMP_PREKEEP & p->flags)
491: p->flags |= TERMP_KEEP;
1.31 schwarze 492: bufferc(p, ' ');
1.40 schwarze 493: if (TERMP_SENTENCE & p->flags)
494: bufferc(p, ' ');
495: } else
496: bufferc(p, ASCII_NBRSP);
1.31 schwarze 497: }
1.1 kristaps 498:
499: if ( ! (p->flags & TERMP_NONOSPACE))
500: p->flags &= ~TERMP_NOSPACE;
1.46 schwarze 501: else
502: p->flags |= TERMP_NOSPACE;
1.1 kristaps 503:
1.52 ! schwarze 504: p->flags &= ~(TERMP_SENTENCE | TERMP_IGNDELIM);
1.31 schwarze 505:
1.45 schwarze 506: while (*word) {
507: if ((ssz = strcspn(word, "\\")) > 0)
508: encode(p, word, ssz);
1.20 schwarze 509:
1.45 schwarze 510: word += ssz;
511: if ('\\' != *word)
1.20 schwarze 512: continue;
513:
514: seq = ++word;
1.50 schwarze 515: word += a2roffdeco(&deco, &seq, &ssz);
1.20 schwarze 516:
517: switch (deco) {
518: case (DECO_RESERVED):
519: res(p, seq, ssz);
520: break;
521: case (DECO_SPECIAL):
1.45 schwarze 522: /* FALLTHROUGH */
523: case (DECO_SSPECIAL):
524: spec(p, deco, seq, ssz);
1.20 schwarze 525: break;
526: case (DECO_BOLD):
527: term_fontrepl(p, TERMFONT_BOLD);
528: break;
529: case (DECO_ITALIC):
530: term_fontrepl(p, TERMFONT_UNDER);
531: break;
532: case (DECO_ROMAN):
533: term_fontrepl(p, TERMFONT_NONE);
534: break;
535: case (DECO_PREVIOUS):
536: term_fontlast(p);
537: break;
538: default:
539: break;
540: }
541:
542: if (DECO_NOSPACE == deco && '\0' == *word)
543: p->flags |= TERMP_NOSPACE;
544: }
1.1 kristaps 545:
1.31 schwarze 546: /*
547: * Note that we don't process the pipe: the parser sees it as
548: * punctuation, but we don't in terms of typography.
549: */
1.45 schwarze 550: if (sv[0] && '\0' == sv[1])
1.14 schwarze 551: switch (sv[0]) {
552: case('('):
553: /* FALLTHROUGH */
554: case('['):
555: p->flags |= TERMP_NOSPACE;
556: break;
557: default:
558: break;
559: }
1.1 kristaps 560: }
561:
562:
563: static void
1.20 schwarze 564: adjbuf(struct termp *p, size_t sz)
1.1 kristaps 565: {
566:
1.20 schwarze 567: if (0 == p->maxcols)
568: p->maxcols = 1024;
569: while (sz >= p->maxcols)
570: p->maxcols <<= 2;
571:
572: p->buf = realloc(p->buf, p->maxcols);
573: if (NULL == p->buf) {
574: perror(NULL);
1.50 schwarze 575: exit((int)MANDOCLEVEL_SYSERR);
1.1 kristaps 576: }
577: }
578:
1.4 schwarze 579:
580: static void
1.20 schwarze 581: bufferc(struct termp *p, char c)
582: {
583:
584: if (p->col + 1 >= p->maxcols)
585: adjbuf(p, p->col + 1);
586:
587: p->buf[(int)p->col++] = c;
588: }
589:
590:
591: static void
592: encode(struct termp *p, const char *word, size_t sz)
1.4 schwarze 593: {
1.20 schwarze 594: enum termfont f;
595: int i;
596:
597: /*
598: * Encode and buffer a string of characters. If the current
599: * font mode is unset, buffer directly, else encode then buffer
600: * character by character.
601: */
602:
1.38 schwarze 603: if (TERMFONT_NONE == (f = term_fonttop(p))) {
1.46 schwarze 604: if (p->col + sz >= p->maxcols)
605: adjbuf(p, p->col + sz);
606: memcpy(&p->buf[(int)p->col], word, sz);
607: p->col += sz;
1.20 schwarze 608: return;
609: }
610:
1.46 schwarze 611: /* Pre-buffer, assuming worst-case. */
612:
613: if (p->col + 1 + (sz * 3) >= p->maxcols)
614: adjbuf(p, p->col + 1 + (sz * 3));
615:
1.20 schwarze 616: for (i = 0; i < (int)sz; i++) {
617: if ( ! isgraph((u_char)word[i])) {
1.46 schwarze 618: p->buf[(int)p->col++] = word[i];
1.20 schwarze 619: continue;
1.4 schwarze 620: }
1.20 schwarze 621:
622: if (TERMFONT_UNDER == f)
1.46 schwarze 623: p->buf[(int)p->col++] = '_';
1.20 schwarze 624: else
1.46 schwarze 625: p->buf[(int)p->col++] = word[i];
1.20 schwarze 626:
1.46 schwarze 627: p->buf[(int)p->col++] = 8;
628: p->buf[(int)p->col++] = word[i];
1.4 schwarze 629: }
630: }
1.16 schwarze 631:
632:
633: size_t
1.39 schwarze 634: term_len(const struct termp *p, size_t sz)
635: {
636:
637: return((*p->width)(p, ' ') * sz);
638: }
639:
640:
641: size_t
642: term_strlen(const struct termp *p, const char *cp)
643: {
1.50 schwarze 644: size_t sz, ssz, rsz, i;
645: enum roffdeco d;
646: const char *seq, *rhs;
647:
648: for (sz = 0; '\0' != *cp; )
649: /*
650: * Account for escaped sequences within string length
651: * calculations. This follows the logic in term_word()
652: * as we must calculate the width of produced strings.
653: */
654: if ('\\' == *cp) {
655: seq = ++cp;
656: cp += a2roffdeco(&d, &seq, &ssz);
657:
658: switch (d) {
659: case (DECO_RESERVED):
660: rhs = chars_res2str
661: (p->symtab, seq, ssz, &rsz);
662: break;
663: case (DECO_SPECIAL):
664: /* FALLTHROUGH */
665: case (DECO_SSPECIAL):
666: rhs = chars_spec2str
667: (p->symtab, seq, ssz, &rsz);
668:
669: /* Allow for one-char escapes. */
670: if (DECO_SSPECIAL != d || rhs)
671: break;
672:
673: rhs = seq;
674: rsz = ssz;
675: break;
676: default:
677: rhs = NULL;
678: break;
679: }
1.39 schwarze 680:
1.50 schwarze 681: if (rhs)
682: for (i = 0; i < rsz; i++)
683: sz += (*p->width)(p, *rhs++);
684: } else
685: sz += (*p->width)(p, *cp++);
1.39 schwarze 686:
687: return(sz);
688: }
689:
690:
1.44 schwarze 691: /* ARGSUSED */
1.39 schwarze 692: size_t
693: term_vspan(const struct termp *p, const struct roffsu *su)
1.16 schwarze 694: {
695: double r;
696:
697: switch (su->unit) {
698: case (SCALE_CM):
699: r = su->scale * 2;
700: break;
701: case (SCALE_IN):
702: r = su->scale * 6;
703: break;
704: case (SCALE_PC):
705: r = su->scale;
706: break;
707: case (SCALE_PT):
708: r = su->scale / 8;
709: break;
710: case (SCALE_MM):
711: r = su->scale / 1000;
712: break;
713: case (SCALE_VS):
714: r = su->scale;
715: break;
716: default:
717: r = su->scale - 1;
718: break;
719: }
720:
721: if (r < 0.0)
722: r = 0.0;
723: return(/* LINTED */(size_t)
724: r);
725: }
726:
727:
728: size_t
1.39 schwarze 729: term_hspan(const struct termp *p, const struct roffsu *su)
1.16 schwarze 730: {
1.44 schwarze 731: double v;
1.16 schwarze 732:
1.44 schwarze 733: v = ((*p->hspan)(p, su));
734: if (v < 0.0)
735: v = 0.0;
736: return((size_t) /* LINTED */
737: v);
1.16 schwarze 738: }
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