Annotation of mandoc/term.c, Revision 1.148
1.148 ! kristaps 1: /* $Id: term.c,v 1.147 2010/06/11 07:23:04 kristaps Exp $ */
1.1 kristaps 2: /*
1.148 ! kristaps 3: * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@bsd.lv>
1.1 kristaps 4: *
5: * Permission to use, copy, modify, and distribute this software for any
1.74 kristaps 6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
1.1 kristaps 8: *
1.74 kristaps 9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1 kristaps 16: */
1.128 kristaps 17: #ifdef HAVE_CONFIG_H
18: #include "config.h"
19: #endif
20:
1.126 kristaps 21: #include <sys/types.h>
22:
1.1 kristaps 23: #include <assert.h>
1.122 kristaps 24: #include <ctype.h>
1.141 kristaps 25: #include <stdint.h>
1.22 kristaps 26: #include <stdio.h>
1.1 kristaps 27: #include <stdlib.h>
28: #include <string.h>
29:
1.137 kristaps 30: #include "mandoc.h"
1.101 kristaps 31: #include "chars.h"
1.107 kristaps 32: #include "out.h"
1.71 kristaps 33: #include "term.h"
34: #include "man.h"
35: #include "mdoc.h"
1.105 kristaps 36: #include "main.h"
1.1 kristaps 37:
1.125 kristaps 38: static void spec(struct termp *, const char *, size_t);
39: static void res(struct termp *, const char *, size_t);
40: static void buffera(struct termp *, const char *, size_t);
41: static void bufferc(struct termp *, char);
42: static void adjbuf(struct termp *p, size_t);
43: static void encode(struct termp *, const char *, size_t);
1.11 kristaps 44:
45:
1.145 kristaps 46: void
1.71 kristaps 47: term_free(struct termp *p)
1.14 kristaps 48: {
49:
1.71 kristaps 50: if (p->buf)
51: free(p->buf);
1.102 kristaps 52: if (p->symtab)
1.101 kristaps 53: chars_free(p->symtab);
1.145 kristaps 54:
1.142 kristaps 55: free(p);
56: }
57:
58:
59: void
60: term_begin(struct termp *p, term_margin head,
61: term_margin foot, const void *arg)
62: {
63:
64: p->headf = head;
65: p->footf = foot;
66: p->argf = arg;
1.146 kristaps 67: (*p->begin)(p);
1.142 kristaps 68: }
69:
70:
71: void
72: term_end(struct termp *p)
73: {
74:
1.146 kristaps 75: (*p->end)(p);
1.14 kristaps 76: }
77:
78:
1.145 kristaps 79: struct termp *
80: term_alloc(enum termenc enc)
1.14 kristaps 81: {
1.141 kristaps 82: struct termp *p;
1.14 kristaps 83:
1.117 kristaps 84: p = calloc(1, sizeof(struct termp));
85: if (NULL == p) {
1.120 kristaps 86: perror(NULL);
1.117 kristaps 87: exit(EXIT_FAILURE);
88: }
1.141 kristaps 89:
1.138 schwarze 90: p->tabwidth = 5;
1.71 kristaps 91: p->enc = enc;
1.145 kristaps 92: p->defrmargin = 78;
1.71 kristaps 93: return(p);
1.14 kristaps 94: }
95:
96:
1.71 kristaps 97: /*
98: * Flush a line of text. A "line" is loosely defined as being something
99: * that should be followed by a newline, regardless of whether it's
100: * broken apart by newlines getting there. A line can also be a
1.130 kristaps 101: * fragment of a columnar list (`Bl -tag' or `Bl -column'), which does
102: * not have a trailing newline.
1.71 kristaps 103: *
1.130 kristaps 104: * The following flags may be specified:
1.71 kristaps 105: *
106: * - TERMP_NOLPAD: when beginning to write the line, don't left-pad the
107: * offset value. This is useful when doing columnar lists where the
108: * prior column has right-padded.
109: *
110: * - TERMP_NOBREAK: this is the most important and is used when making
111: * columns. In short: don't print a newline and instead pad to the
112: * right margin. Used in conjunction with TERMP_NOLPAD.
113: *
1.91 kristaps 114: * - TERMP_TWOSPACE: when padding, make sure there are at least two
115: * space characters of padding. Otherwise, rather break the line.
116: *
1.84 kristaps 117: * - TERMP_DANGLE: don't newline when TERMP_NOBREAK is specified and
118: * the line is overrun, and don't pad-right if it's underrun.
119: *
120: * - TERMP_HANG: like TERMP_DANGLE, but doesn't newline when
121: * overruning, instead save the position and continue at that point
122: * when the next invocation.
1.71 kristaps 123: *
124: * In-line line breaking:
125: *
126: * If TERMP_NOBREAK is specified and the line overruns the right
127: * margin, it will break and pad-right to the right margin after
128: * writing. If maxrmargin is violated, it will break and continue
1.114 kristaps 129: * writing from the right-margin, which will lead to the above scenario
130: * upon exit. Otherwise, the line will break at the right margin.
1.71 kristaps 131: */
132: void
133: term_flushln(struct termp *p)
1.53 kristaps 134: {
1.114 kristaps 135: int i; /* current input position in p->buf */
136: size_t vis; /* current visual position on output */
137: size_t vbl; /* number of blanks to prepend to output */
1.136 schwarze 138: size_t vend; /* end of word visual position on output */
1.114 kristaps 139: size_t bp; /* visual right border position */
140: int j; /* temporary loop index */
1.140 kristaps 141: int jhy; /* last hyphen before line overflow */
1.114 kristaps 142: size_t maxvis, mmax;
1.53 kristaps 143:
1.71 kristaps 144: /*
145: * First, establish the maximum columns of "visible" content.
146: * This is usually the difference between the right-margin and
147: * an indentation, but can be, for tagged lists or columns, a
1.115 kristaps 148: * small set of values.
1.71 kristaps 149: */
1.53 kristaps 150:
1.71 kristaps 151: assert(p->offset < p->rmargin);
1.92 kristaps 152:
1.129 kristaps 153: maxvis = (int)(p->rmargin - p->offset) - p->overstep < 0 ?
1.119 kristaps 154: /* LINTED */
1.129 kristaps 155: 0 : p->rmargin - p->offset - p->overstep;
156: mmax = (int)(p->maxrmargin - p->offset) - p->overstep < 0 ?
1.119 kristaps 157: /* LINTED */
1.129 kristaps 158: 0 : p->maxrmargin - p->offset - p->overstep;
1.92 kristaps 159:
1.71 kristaps 160: bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
1.115 kristaps 161:
1.136 schwarze 162: /*
163: * Indent the first line of a paragraph.
164: */
165: vbl = p->flags & TERMP_NOLPAD ? 0 : p->offset;
166:
1.115 kristaps 167: /*
168: * FIXME: if bp is zero, we still output the first word before
169: * breaking the line.
170: */
171:
1.136 schwarze 172: vis = vend = i = 0;
173: while (i < (int)p->col) {
1.71 kristaps 174:
175: /*
1.138 schwarze 176: * Handle literal tab characters.
177: */
178: for (j = i; j < (int)p->col; j++) {
179: if ('\t' != p->buf[j])
180: break;
181: vend = (vis/p->tabwidth+1)*p->tabwidth;
182: vbl += vend - vis;
183: vis = vend;
184: }
185:
186: /*
1.71 kristaps 187: * Count up visible word characters. Control sequences
188: * (starting with the CSI) aren't counted. A space
189: * generates a non-printing word, which is valid (the
190: * space is printed according to regular spacing rules).
191: */
192:
193: /* LINTED */
1.140 kristaps 194: for (jhy = 0; j < (int)p->col; j++) {
1.138 schwarze 195: if ((j && ' ' == p->buf[j]) || '\t' == p->buf[j])
1.71 kristaps 196: break;
1.140 kristaps 197: if (8 != p->buf[j]) {
198: if (vend > vis && vend < bp &&
199: ASCII_HYPH == p->buf[j])
200: jhy = j;
201: vend++;
202: } else
1.136 schwarze 203: vend--;
1.71 kristaps 204: }
1.53 kristaps 205:
1.71 kristaps 206: /*
1.81 kristaps 207: * Find out whether we would exceed the right margin.
1.136 schwarze 208: * If so, break to the next line.
1.81 kristaps 209: */
1.140 kristaps 210: if (vend > bp && 0 == jhy && vis > 0) {
1.136 schwarze 211: vend -= vis;
1.146 kristaps 212: (*p->endline)(p);
1.81 kristaps 213: if (TERMP_NOBREAK & p->flags) {
1.139 schwarze 214: p->viscol = p->rmargin;
1.146 kristaps 215: (*p->advance)(p, p->rmargin);
1.136 schwarze 216: vend += p->rmargin - p->offset;
1.81 kristaps 217: } else {
1.139 schwarze 218: p->viscol = 0;
1.136 schwarze 219: vbl = p->offset;
1.81 kristaps 220: }
1.130 kristaps 221:
1.129 kristaps 222: /* Remove the p->overstep width. */
1.130 kristaps 223:
1.112 kristaps 224: bp += (int)/* LINTED */
1.129 kristaps 225: p->overstep;
226: p->overstep = 0;
1.71 kristaps 227: }
1.53 kristaps 228:
1.138 schwarze 229: /*
230: * Skip leading tabs, they were handled above.
231: */
232: while (i < (int)p->col && '\t' == p->buf[i])
233: i++;
234:
1.130 kristaps 235: /* Write out the [remaining] word. */
1.136 schwarze 236: for ( ; i < (int)p->col; i++) {
1.140 kristaps 237: if (vend > bp && jhy > 0 && i > jhy)
238: break;
1.138 schwarze 239: if ('\t' == p->buf[i])
240: break;
1.136 schwarze 241: if (' ' == p->buf[i]) {
242: while (' ' == p->buf[i]) {
243: vbl++;
244: i++;
245: }
1.71 kristaps 246: break;
1.136 schwarze 247: }
248: if (ASCII_NBRSP == p->buf[i]) {
249: vbl++;
250: continue;
251: }
1.130 kristaps 252:
1.136 schwarze 253: /*
254: * Now we definitely know there will be
255: * printable characters to output,
256: * so write preceding white space now.
257: */
258: if (vbl) {
1.146 kristaps 259: (*p->advance)(p, vbl);
1.139 schwarze 260: p->viscol += vbl;
1.136 schwarze 261: vbl = 0;
262: }
1.140 kristaps 263:
264: if (ASCII_HYPH == p->buf[i])
1.146 kristaps 265: (*p->letter)(p, '-');
1.140 kristaps 266: else
1.146 kristaps 267: (*p->letter)(p, p->buf[i]);
1.140 kristaps 268:
1.139 schwarze 269: p->viscol += 1;
1.136 schwarze 270: }
271: vend += vbl;
272: vis = vend;
1.71 kristaps 273: }
1.111 kristaps 274:
1.91 kristaps 275: p->col = 0;
1.129 kristaps 276: p->overstep = 0;
1.15 kristaps 277:
1.91 kristaps 278: if ( ! (TERMP_NOBREAK & p->flags)) {
1.139 schwarze 279: p->viscol = 0;
1.146 kristaps 280: (*p->endline)(p);
1.15 kristaps 281: return;
1.71 kristaps 282: }
1.15 kristaps 283:
1.91 kristaps 284: if (TERMP_HANG & p->flags) {
285: /* We need one blank after the tag. */
1.129 kristaps 286: p->overstep = /* LINTED */
1.92 kristaps 287: vis - maxvis + 1;
1.91 kristaps 288:
289: /*
290: * Behave exactly the same way as groff:
1.92 kristaps 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.
1.91 kristaps 294: * If we landed right at the margin, be happy.
1.92 kristaps 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.
1.91 kristaps 298: */
1.129 kristaps 299: if (p->overstep >= -1) {
300: assert((int)maxvis + p->overstep >= 0);
1.92 kristaps 301: /* LINTED */
1.129 kristaps 302: maxvis += p->overstep;
1.92 kristaps 303: } else
1.129 kristaps 304: p->overstep = 0;
1.91 kristaps 305:
306: } else if (TERMP_DANGLE & p->flags)
307: return;
1.15 kristaps 308:
1.92 kristaps 309: /* Right-pad. */
310: if (maxvis > vis + /* LINTED */
1.139 schwarze 311: ((TERMP_TWOSPACE & p->flags) ? 1 : 0)) {
312: p->viscol += maxvis - vis;
1.146 kristaps 313: (*p->advance)(p, maxvis - vis);
1.142 kristaps 314: vis += (maxvis - vis);
1.139 schwarze 315: } else { /* ...or newline break. */
1.146 kristaps 316: (*p->endline)(p);
1.139 schwarze 317: p->viscol = p->rmargin;
1.146 kristaps 318: (*p->advance)(p, p->rmargin);
1.91 kristaps 319: }
1.15 kristaps 320: }
321:
322:
1.71 kristaps 323: /*
324: * A newline only breaks an existing line; it won't assert vertical
325: * space. All data in the output buffer is flushed prior to the newline
326: * assertion.
327: */
328: void
329: term_newln(struct termp *p)
1.15 kristaps 330: {
331:
1.71 kristaps 332: p->flags |= TERMP_NOSPACE;
1.139 schwarze 333: if (0 == p->col && 0 == p->viscol) {
1.71 kristaps 334: p->flags &= ~TERMP_NOLPAD;
1.15 kristaps 335: return;
1.16 kristaps 336: }
1.71 kristaps 337: term_flushln(p);
338: p->flags &= ~TERMP_NOLPAD;
1.16 kristaps 339: }
340:
341:
1.71 kristaps 342: /*
343: * Asserts a vertical space (a full, empty line-break between lines).
344: * Note that if used twice, this will cause two blank spaces and so on.
345: * All data in the output buffer is flushed prior to the newline
346: * assertion.
347: */
348: void
349: term_vspace(struct termp *p)
1.16 kristaps 350: {
351:
1.62 kristaps 352: term_newln(p);
1.139 schwarze 353: p->viscol = 0;
1.146 kristaps 354: (*p->endline)(p);
1.16 kristaps 355: }
356:
357:
1.71 kristaps 358: static void
1.125 kristaps 359: spec(struct termp *p, const char *word, size_t len)
1.17 kristaps 360: {
1.71 kristaps 361: const char *rhs;
362: size_t sz;
1.17 kristaps 363:
1.101 kristaps 364: rhs = chars_a2ascii(p->symtab, word, len, &sz);
1.125 kristaps 365: if (rhs)
366: encode(p, rhs, sz);
1.94 kristaps 367: }
368:
369:
370: static void
1.125 kristaps 371: res(struct termp *p, const char *word, size_t len)
1.94 kristaps 372: {
373: const char *rhs;
374: size_t sz;
375:
1.101 kristaps 376: rhs = chars_a2res(p->symtab, word, len, &sz);
1.125 kristaps 377: if (rhs)
378: encode(p, rhs, sz);
379: }
380:
381:
382: void
383: term_fontlast(struct termp *p)
384: {
385: enum termfont f;
386:
387: f = p->fontl;
388: p->fontl = p->fontq[p->fonti];
389: p->fontq[p->fonti] = f;
390: }
391:
392:
393: void
394: term_fontrepl(struct termp *p, enum termfont f)
395: {
396:
397: p->fontl = p->fontq[p->fonti];
398: p->fontq[p->fonti] = f;
399: }
400:
401:
402: void
403: term_fontpush(struct termp *p, enum termfont f)
404: {
405:
406: assert(p->fonti + 1 < 10);
407: p->fontl = p->fontq[p->fonti];
408: p->fontq[++p->fonti] = f;
409: }
410:
411:
412: const void *
413: term_fontq(struct termp *p)
414: {
415:
416: return(&p->fontq[p->fonti]);
417: }
418:
419:
420: enum termfont
421: term_fonttop(struct termp *p)
422: {
423:
424: return(p->fontq[p->fonti]);
425: }
426:
427:
428: void
429: term_fontpopq(struct termp *p, const void *key)
430: {
431:
432: while (p->fonti >= 0 && key != &p->fontq[p->fonti])
433: p->fonti--;
434: assert(p->fonti >= 0);
435: }
1.94 kristaps 436:
1.125 kristaps 437:
438: void
439: term_fontpop(struct termp *p)
440: {
441:
442: assert(p->fonti);
443: p->fonti--;
1.17 kristaps 444: }
445:
446:
1.71 kristaps 447: /*
448: * Handle pwords, partial words, which may be either a single word or a
449: * phrase that cannot be broken down (such as a literal string). This
450: * handles word styling.
451: */
1.86 kristaps 452: void
453: term_word(struct termp *p, const char *word)
1.65 kristaps 454: {
1.124 kristaps 455: const char *sv, *seq;
1.125 kristaps 456: int sz;
1.124 kristaps 457: size_t ssz;
458: enum roffdeco deco;
1.71 kristaps 459:
1.100 kristaps 460: sv = word;
461:
1.123 kristaps 462: if (word[0] && '\0' == word[1])
1.100 kristaps 463: switch (word[0]) {
464: case('.'):
465: /* FALLTHROUGH */
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: if ( ! (TERMP_IGNDELIM & p->flags))
480: p->flags |= TERMP_NOSPACE;
481: break;
482: default:
483: break;
484: }
1.65 kristaps 485:
1.133 kristaps 486: if ( ! (TERMP_NOSPACE & p->flags)) {
1.125 kristaps 487: bufferc(p, ' ');
1.133 kristaps 488: if (TERMP_SENTENCE & p->flags)
489: bufferc(p, ' ');
490: }
1.65 kristaps 491:
1.71 kristaps 492: if ( ! (p->flags & TERMP_NONOSPACE))
493: p->flags &= ~TERMP_NOSPACE;
1.133 kristaps 494:
495: p->flags &= ~TERMP_SENTENCE;
1.65 kristaps 496:
1.125 kristaps 497: /* FIXME: use strcspn. */
1.124 kristaps 498:
499: while (*word) {
500: if ('\\' != *word) {
1.125 kristaps 501: encode(p, word, 1);
1.124 kristaps 502: word++;
503: continue;
504: }
505:
506: seq = ++word;
507: sz = a2roffdeco(&deco, &seq, &ssz);
508:
509: switch (deco) {
510: case (DECO_RESERVED):
1.125 kristaps 511: res(p, seq, ssz);
1.124 kristaps 512: break;
513: case (DECO_SPECIAL):
1.125 kristaps 514: spec(p, seq, ssz);
1.124 kristaps 515: break;
516: case (DECO_BOLD):
1.125 kristaps 517: term_fontrepl(p, TERMFONT_BOLD);
1.124 kristaps 518: break;
519: case (DECO_ITALIC):
1.125 kristaps 520: term_fontrepl(p, TERMFONT_UNDER);
1.124 kristaps 521: break;
522: case (DECO_ROMAN):
1.125 kristaps 523: term_fontrepl(p, TERMFONT_NONE);
1.124 kristaps 524: break;
525: case (DECO_PREVIOUS):
1.125 kristaps 526: term_fontlast(p);
1.124 kristaps 527: break;
528: default:
529: break;
530: }
1.127 kristaps 531:
1.124 kristaps 532: word += sz;
1.127 kristaps 533: if (DECO_NOSPACE == deco && '\0' == *word)
534: p->flags |= TERMP_NOSPACE;
1.124 kristaps 535: }
1.65 kristaps 536:
1.131 kristaps 537: /*
538: * Note that we don't process the pipe: the parser sees it as
539: * punctuation, but we don't in terms of typography.
540: */
1.100 kristaps 541: if (sv[0] && 0 == sv[1])
542: switch (sv[0]) {
543: case('('):
544: /* FALLTHROUGH */
545: case('['):
546: p->flags |= TERMP_NOSPACE;
547: break;
548: default:
549: break;
550: }
1.65 kristaps 551: }
552:
553:
1.71 kristaps 554: static void
1.125 kristaps 555: adjbuf(struct termp *p, size_t sz)
1.51 kristaps 556: {
557:
1.125 kristaps 558: if (0 == p->maxcols)
559: p->maxcols = 1024;
560: while (sz >= p->maxcols)
561: p->maxcols <<= 2;
562:
563: p->buf = realloc(p->buf, p->maxcols);
564: if (NULL == p->buf) {
565: perror(NULL);
566: exit(EXIT_FAILURE);
1.71 kristaps 567: }
1.51 kristaps 568: }
569:
1.79 kristaps 570:
571: static void
1.125 kristaps 572: buffera(struct termp *p, const char *word, size_t sz)
1.79 kristaps 573: {
1.125 kristaps 574:
575: if (p->col + sz >= p->maxcols)
576: adjbuf(p, p->col + sz);
577:
1.126 kristaps 578: memcpy(&p->buf[(int)p->col], word, sz);
1.125 kristaps 579: p->col += sz;
580: }
581:
582:
583: static void
584: bufferc(struct termp *p, char c)
585: {
586:
587: if (p->col + 1 >= p->maxcols)
588: adjbuf(p, p->col + 1);
589:
1.126 kristaps 590: p->buf[(int)p->col++] = c;
1.125 kristaps 591: }
592:
593:
594: static void
595: encode(struct termp *p, const char *word, size_t sz)
596: {
597: enum termfont f;
598: int i;
599:
600: /*
601: * Encode and buffer a string of characters. If the current
602: * font mode is unset, buffer directly, else encode then buffer
603: * character by character.
604: */
605:
1.147 kristaps 606: if (TERMFONT_NONE == (f = term_fonttop(p))) {
1.125 kristaps 607: buffera(p, word, sz);
608: return;
609: }
610:
611: for (i = 0; i < (int)sz; i++) {
612: if ( ! isgraph((u_char)word[i])) {
613: bufferc(p, word[i]);
614: continue;
1.79 kristaps 615: }
1.125 kristaps 616:
617: if (TERMFONT_UNDER == f)
618: bufferc(p, '_');
619: else
620: bufferc(p, word[i]);
621:
622: bufferc(p, 8);
623: bufferc(p, word[i]);
1.79 kristaps 624: }
625: }
1.106 kristaps 626:
627:
1.107 kristaps 628: size_t
629: term_vspan(const struct roffsu *su)
1.106 kristaps 630: {
631: double r;
632:
1.107 kristaps 633: switch (su->unit) {
1.106 kristaps 634: case (SCALE_CM):
1.107 kristaps 635: r = su->scale * 2;
1.106 kristaps 636: break;
637: case (SCALE_IN):
1.107 kristaps 638: r = su->scale * 6;
1.106 kristaps 639: break;
640: case (SCALE_PC):
1.107 kristaps 641: r = su->scale;
1.106 kristaps 642: break;
643: case (SCALE_PT):
1.107 kristaps 644: r = su->scale / 8;
1.106 kristaps 645: break;
646: case (SCALE_MM):
1.107 kristaps 647: r = su->scale / 1000;
1.106 kristaps 648: break;
649: case (SCALE_VS):
1.107 kristaps 650: r = su->scale;
1.106 kristaps 651: break;
652: default:
1.107 kristaps 653: r = su->scale - 1;
1.106 kristaps 654: break;
655: }
656:
657: if (r < 0.0)
658: r = 0.0;
1.107 kristaps 659: return(/* LINTED */(size_t)
1.106 kristaps 660: r);
661: }
662:
663:
1.107 kristaps 664: size_t
665: term_hspan(const struct roffsu *su)
1.106 kristaps 666: {
667: double r;
668:
1.108 kristaps 669: /* XXX: CM, IN, and PT are approximations. */
670:
1.107 kristaps 671: switch (su->unit) {
1.106 kristaps 672: case (SCALE_CM):
1.108 kristaps 673: r = 4 * su->scale;
1.106 kristaps 674: break;
675: case (SCALE_IN):
1.108 kristaps 676: /* XXX: this is an approximation. */
677: r = 10 * su->scale;
1.106 kristaps 678: break;
679: case (SCALE_PC):
1.108 kristaps 680: r = (10 * su->scale) / 6;
1.106 kristaps 681: break;
682: case (SCALE_PT):
1.108 kristaps 683: r = (10 * su->scale) / 72;
1.106 kristaps 684: break;
685: case (SCALE_MM):
1.107 kristaps 686: r = su->scale / 1000; /* FIXME: double-check. */
1.106 kristaps 687: break;
688: case (SCALE_VS):
1.107 kristaps 689: r = su->scale * 2 - 1; /* FIXME: double-check. */
1.106 kristaps 690: break;
691: default:
1.107 kristaps 692: r = su->scale;
1.106 kristaps 693: break;
694: }
695:
696: if (r < 0.0)
697: r = 0.0;
1.107 kristaps 698: return((size_t)/* LINTED */
1.106 kristaps 699: r);
700: }
701:
702:
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