Annotation of src/usr.bin/mandoc/term.c, Revision 1.56
1.56 ! schwarze 1: /* $Id: term.c,v 1.55 2011/01/04 22:28:17 schwarze Exp $ */
1.1 kristaps 2: /*
1.44 schwarze 3: * Copyright (c) 2008, 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
1.56 ! schwarze 4: * Copyright (c) 2010, 2011 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: */
1.54 schwarze 145: assert (p->rmargin >= p->offset);
1.53 schwarze 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
1.56 ! schwarze 352: numbered(struct termp *p, const char *word, size_t len)
! 353: {
! 354: const char *rhs;
! 355:
! 356: rhs = chars_num2char(word, len);
! 357: if (rhs)
! 358: encode(p, rhs, 1);
! 359: }
! 360:
! 361:
! 362: static void
1.45 schwarze 363: spec(struct termp *p, enum roffdeco d, const char *word, size_t len)
1.1 kristaps 364: {
365: const char *rhs;
366: size_t sz;
367:
1.45 schwarze 368: rhs = chars_spec2str(p->symtab, word, len, &sz);
1.20 schwarze 369: if (rhs)
370: encode(p, rhs, sz);
1.45 schwarze 371: else if (DECO_SSPECIAL == d)
372: encode(p, word, len);
1.11 schwarze 373: }
374:
375:
376: static void
1.20 schwarze 377: res(struct termp *p, const char *word, size_t len)
1.11 schwarze 378: {
379: const char *rhs;
380: size_t sz;
381:
1.45 schwarze 382: rhs = chars_res2str(p->symtab, word, len, &sz);
1.20 schwarze 383: if (rhs)
384: encode(p, rhs, sz);
385: }
386:
387:
388: void
389: term_fontlast(struct termp *p)
390: {
391: enum termfont f;
1.11 schwarze 392:
1.20 schwarze 393: f = p->fontl;
394: p->fontl = p->fontq[p->fonti];
395: p->fontq[p->fonti] = f;
396: }
397:
398:
399: void
400: term_fontrepl(struct termp *p, enum termfont f)
401: {
402:
403: p->fontl = p->fontq[p->fonti];
404: p->fontq[p->fonti] = f;
1.1 kristaps 405: }
406:
407:
1.20 schwarze 408: void
409: term_fontpush(struct termp *p, enum termfont f)
1.1 kristaps 410: {
1.7 schwarze 411:
1.20 schwarze 412: assert(p->fonti + 1 < 10);
413: p->fontl = p->fontq[p->fonti];
414: p->fontq[++p->fonti] = f;
415: }
1.1 kristaps 416:
417:
1.20 schwarze 418: const void *
419: term_fontq(struct termp *p)
420: {
1.1 kristaps 421:
1.20 schwarze 422: return(&p->fontq[p->fonti]);
423: }
1.1 kristaps 424:
425:
1.20 schwarze 426: enum termfont
427: term_fonttop(struct termp *p)
428: {
1.1 kristaps 429:
1.20 schwarze 430: return(p->fontq[p->fonti]);
431: }
1.7 schwarze 432:
433:
1.20 schwarze 434: void
435: term_fontpopq(struct termp *p, const void *key)
436: {
1.1 kristaps 437:
1.20 schwarze 438: while (p->fonti >= 0 && key != &p->fontq[p->fonti])
439: p->fonti--;
440: assert(p->fonti >= 0);
441: }
1.1 kristaps 442:
443:
1.20 schwarze 444: void
445: term_fontpop(struct termp *p)
446: {
1.1 kristaps 447:
1.20 schwarze 448: assert(p->fonti);
449: p->fonti--;
1.1 kristaps 450: }
451:
452:
453: /*
454: * Handle pwords, partial words, which may be either a single word or a
455: * phrase that cannot be broken down (such as a literal string). This
456: * handles word styling.
457: */
1.7 schwarze 458: void
459: term_word(struct termp *p, const char *word)
1.1 kristaps 460: {
1.20 schwarze 461: const char *sv, *seq;
462: size_t ssz;
463: enum roffdeco deco;
1.1 kristaps 464:
1.14 schwarze 465: sv = word;
466:
1.20 schwarze 467: if (word[0] && '\0' == word[1])
1.14 schwarze 468: switch (word[0]) {
469: case('.'):
470: /* FALLTHROUGH */
471: case(','):
472: /* FALLTHROUGH */
473: case(';'):
474: /* FALLTHROUGH */
475: case(':'):
476: /* FALLTHROUGH */
477: case('?'):
478: /* FALLTHROUGH */
479: case('!'):
480: /* FALLTHROUGH */
481: case(')'):
482: /* FALLTHROUGH */
483: case(']'):
484: if ( ! (TERMP_IGNDELIM & p->flags))
485: p->flags |= TERMP_NOSPACE;
486: break;
487: default:
488: break;
489: }
1.1 kristaps 490:
1.31 schwarze 491: if ( ! (TERMP_NOSPACE & p->flags)) {
1.40 schwarze 492: if ( ! (TERMP_KEEP & p->flags)) {
493: if (TERMP_PREKEEP & p->flags)
494: p->flags |= TERMP_KEEP;
1.31 schwarze 495: bufferc(p, ' ');
1.40 schwarze 496: if (TERMP_SENTENCE & p->flags)
497: bufferc(p, ' ');
498: } else
499: bufferc(p, ASCII_NBRSP);
1.31 schwarze 500: }
1.1 kristaps 501:
502: if ( ! (p->flags & TERMP_NONOSPACE))
503: p->flags &= ~TERMP_NOSPACE;
1.46 schwarze 504: else
505: p->flags |= TERMP_NOSPACE;
1.1 kristaps 506:
1.52 schwarze 507: p->flags &= ~(TERMP_SENTENCE | TERMP_IGNDELIM);
1.31 schwarze 508:
1.45 schwarze 509: while (*word) {
510: if ((ssz = strcspn(word, "\\")) > 0)
511: encode(p, word, ssz);
1.20 schwarze 512:
1.45 schwarze 513: word += ssz;
514: if ('\\' != *word)
1.20 schwarze 515: continue;
516:
517: seq = ++word;
1.50 schwarze 518: word += a2roffdeco(&deco, &seq, &ssz);
1.20 schwarze 519:
520: switch (deco) {
1.56 ! schwarze 521: case (DECO_NUMBERED):
! 522: numbered(p, seq, ssz);
! 523: break;
1.20 schwarze 524: case (DECO_RESERVED):
525: res(p, seq, ssz);
526: break;
527: case (DECO_SPECIAL):
1.45 schwarze 528: /* FALLTHROUGH */
529: case (DECO_SSPECIAL):
530: spec(p, deco, seq, ssz);
1.20 schwarze 531: break;
532: case (DECO_BOLD):
533: term_fontrepl(p, TERMFONT_BOLD);
534: break;
535: case (DECO_ITALIC):
536: term_fontrepl(p, TERMFONT_UNDER);
537: break;
538: case (DECO_ROMAN):
539: term_fontrepl(p, TERMFONT_NONE);
540: break;
541: case (DECO_PREVIOUS):
542: term_fontlast(p);
543: break;
544: default:
545: break;
546: }
547:
548: if (DECO_NOSPACE == deco && '\0' == *word)
549: p->flags |= TERMP_NOSPACE;
550: }
1.1 kristaps 551:
1.31 schwarze 552: /*
553: * Note that we don't process the pipe: the parser sees it as
554: * punctuation, but we don't in terms of typography.
555: */
1.45 schwarze 556: if (sv[0] && '\0' == sv[1])
1.14 schwarze 557: switch (sv[0]) {
558: case('('):
559: /* FALLTHROUGH */
560: case('['):
561: p->flags |= TERMP_NOSPACE;
562: break;
563: default:
564: break;
565: }
1.1 kristaps 566: }
567:
568:
569: static void
1.20 schwarze 570: adjbuf(struct termp *p, size_t sz)
1.1 kristaps 571: {
572:
1.20 schwarze 573: if (0 == p->maxcols)
574: p->maxcols = 1024;
575: while (sz >= p->maxcols)
576: p->maxcols <<= 2;
577:
578: p->buf = realloc(p->buf, p->maxcols);
579: if (NULL == p->buf) {
580: perror(NULL);
1.50 schwarze 581: exit((int)MANDOCLEVEL_SYSERR);
1.1 kristaps 582: }
583: }
584:
1.4 schwarze 585:
586: static void
1.20 schwarze 587: bufferc(struct termp *p, char c)
588: {
589:
590: if (p->col + 1 >= p->maxcols)
591: adjbuf(p, p->col + 1);
592:
593: p->buf[(int)p->col++] = c;
594: }
595:
596:
597: static void
598: encode(struct termp *p, const char *word, size_t sz)
1.4 schwarze 599: {
1.20 schwarze 600: enum termfont f;
601: int i;
602:
603: /*
604: * Encode and buffer a string of characters. If the current
605: * font mode is unset, buffer directly, else encode then buffer
606: * character by character.
607: */
608:
1.38 schwarze 609: if (TERMFONT_NONE == (f = term_fonttop(p))) {
1.46 schwarze 610: if (p->col + sz >= p->maxcols)
611: adjbuf(p, p->col + sz);
612: memcpy(&p->buf[(int)p->col], word, sz);
613: p->col += sz;
1.20 schwarze 614: return;
615: }
616:
1.46 schwarze 617: /* Pre-buffer, assuming worst-case. */
618:
619: if (p->col + 1 + (sz * 3) >= p->maxcols)
620: adjbuf(p, p->col + 1 + (sz * 3));
621:
1.20 schwarze 622: for (i = 0; i < (int)sz; i++) {
623: if ( ! isgraph((u_char)word[i])) {
1.46 schwarze 624: p->buf[(int)p->col++] = word[i];
1.20 schwarze 625: continue;
1.4 schwarze 626: }
1.20 schwarze 627:
628: if (TERMFONT_UNDER == f)
1.46 schwarze 629: p->buf[(int)p->col++] = '_';
1.20 schwarze 630: else
1.46 schwarze 631: p->buf[(int)p->col++] = word[i];
1.20 schwarze 632:
1.46 schwarze 633: p->buf[(int)p->col++] = 8;
634: p->buf[(int)p->col++] = word[i];
1.4 schwarze 635: }
636: }
1.16 schwarze 637:
638:
639: size_t
1.39 schwarze 640: term_len(const struct termp *p, size_t sz)
641: {
642:
643: return((*p->width)(p, ' ') * sz);
644: }
645:
646:
647: size_t
648: term_strlen(const struct termp *p, const char *cp)
649: {
1.50 schwarze 650: size_t sz, ssz, rsz, i;
651: enum roffdeco d;
652: const char *seq, *rhs;
653:
654: for (sz = 0; '\0' != *cp; )
655: /*
656: * Account for escaped sequences within string length
657: * calculations. This follows the logic in term_word()
658: * as we must calculate the width of produced strings.
659: */
660: if ('\\' == *cp) {
661: seq = ++cp;
662: cp += a2roffdeco(&d, &seq, &ssz);
663:
664: switch (d) {
665: case (DECO_RESERVED):
666: rhs = chars_res2str
667: (p->symtab, seq, ssz, &rsz);
668: break;
669: case (DECO_SPECIAL):
670: /* FALLTHROUGH */
671: case (DECO_SSPECIAL):
672: rhs = chars_spec2str
673: (p->symtab, seq, ssz, &rsz);
674:
675: /* Allow for one-char escapes. */
676: if (DECO_SSPECIAL != d || rhs)
677: break;
678:
679: rhs = seq;
680: rsz = ssz;
681: break;
682: default:
683: rhs = NULL;
684: break;
685: }
1.39 schwarze 686:
1.50 schwarze 687: if (rhs)
688: for (i = 0; i < rsz; i++)
689: sz += (*p->width)(p, *rhs++);
1.55 schwarze 690: } else if (ASCII_NBRSP == *cp) {
691: sz += (*p->width)(p, ' ');
692: cp++;
693: } else if (ASCII_HYPH == *cp) {
694: sz += (*p->width)(p, '-');
695: cp++;
1.50 schwarze 696: } else
697: sz += (*p->width)(p, *cp++);
1.39 schwarze 698:
699: return(sz);
700: }
701:
702:
1.44 schwarze 703: /* ARGSUSED */
1.39 schwarze 704: size_t
705: term_vspan(const struct termp *p, const struct roffsu *su)
1.16 schwarze 706: {
707: double r;
708:
709: switch (su->unit) {
710: case (SCALE_CM):
711: r = su->scale * 2;
712: break;
713: case (SCALE_IN):
714: r = su->scale * 6;
715: break;
716: case (SCALE_PC):
717: r = su->scale;
718: break;
719: case (SCALE_PT):
720: r = su->scale / 8;
721: break;
722: case (SCALE_MM):
723: r = su->scale / 1000;
724: break;
725: case (SCALE_VS):
726: r = su->scale;
727: break;
728: default:
729: r = su->scale - 1;
730: break;
731: }
732:
733: if (r < 0.0)
734: r = 0.0;
735: return(/* LINTED */(size_t)
736: r);
737: }
738:
739:
740: size_t
1.39 schwarze 741: term_hspan(const struct termp *p, const struct roffsu *su)
1.16 schwarze 742: {
1.44 schwarze 743: double v;
1.16 schwarze 744:
1.44 schwarze 745: v = ((*p->hspan)(p, su));
746: if (v < 0.0)
747: v = 0.0;
748: return((size_t) /* LINTED */
749: v);
1.16 schwarze 750: }
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