Annotation of src/usr.bin/mandoc/term.c, Revision 1.42
1.42 ! schwarze 1: /* $Id: term.c,v 1.41 2010/06/27 21:54:42 schwarze Exp $ */
1.1 kristaps 2: /*
1.38 schwarze 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
1.2 schwarze 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: *
1.2 schwarze 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: */
1.20 schwarze 17: #include <sys/types.h>
18:
1.1 kristaps 19: #include <assert.h>
1.20 schwarze 20: #include <ctype.h>
1.36 schwarze 21: #include <stdint.h>
1.1 kristaps 22: #include <stdio.h>
23: #include <stdlib.h>
24: #include <string.h>
25:
1.34 schwarze 26: #include "mandoc.h"
1.15 schwarze 27: #include "chars.h"
1.16 schwarze 28: #include "out.h"
1.1 kristaps 29: #include "term.h"
1.16 schwarze 30: #include "main.h"
1.1 kristaps 31:
1.20 schwarze 32: static void spec(struct termp *, const char *, size_t);
33: static void res(struct termp *, const char *, size_t);
34: static void buffera(struct termp *, const char *, size_t);
35: static void bufferc(struct termp *, char);
36: static void adjbuf(struct termp *p, size_t);
37: static void encode(struct termp *, const char *, size_t);
1.1 kristaps 38:
39:
1.37 schwarze 40: void
41: term_free(struct termp *p)
1.1 kristaps 42: {
43:
1.37 schwarze 44: if (p->buf)
45: free(p->buf);
46: if (p->symtab)
47: chars_free(p->symtab);
48:
49: free(p);
1.1 kristaps 50: }
51:
52:
1.13 schwarze 53: void
1.37 schwarze 54: term_begin(struct termp *p, term_margin head,
55: term_margin foot, const void *arg)
1.1 kristaps 56: {
57:
1.37 schwarze 58: p->headf = head;
59: p->footf = foot;
60: p->argf = arg;
61: (*p->begin)(p);
1.1 kristaps 62: }
63:
64:
1.37 schwarze 65: void
66: term_end(struct termp *p)
1.1 kristaps 67: {
68:
1.37 schwarze 69: (*p->end)(p);
1.1 kristaps 70: }
71:
72:
1.37 schwarze 73: struct termp *
74: term_alloc(enum termenc enc)
1.1 kristaps 75: {
1.36 schwarze 76: struct termp *p;
1.1 kristaps 77:
1.19 schwarze 78: p = calloc(1, sizeof(struct termp));
79: if (NULL == p) {
80: perror(NULL);
81: exit(EXIT_FAILURE);
82: }
1.36 schwarze 83:
1.1 kristaps 84: p->enc = enc;
85: return(p);
86: }
87:
88:
89: /*
90: * Flush a line of text. A "line" is loosely defined as being something
91: * that should be followed by a newline, regardless of whether it's
92: * broken apart by newlines getting there. A line can also be a
1.27 schwarze 93: * fragment of a columnar list (`Bl -tag' or `Bl -column'), which does
94: * not have a trailing newline.
1.1 kristaps 95: *
1.27 schwarze 96: * The following flags may be specified:
1.1 kristaps 97: *
98: * - TERMP_NOLPAD: when beginning to write the line, don't left-pad the
99: * offset value. This is useful when doing columnar lists where the
100: * prior column has right-padded.
101: *
102: * - TERMP_NOBREAK: this is the most important and is used when making
103: * columns. In short: don't print a newline and instead pad to the
104: * right margin. Used in conjunction with TERMP_NOLPAD.
105: *
1.9 schwarze 106: * - TERMP_TWOSPACE: when padding, make sure there are at least two
107: * space characters of padding. Otherwise, rather break the line.
108: *
1.6 schwarze 109: * - TERMP_DANGLE: don't newline when TERMP_NOBREAK is specified and
110: * the line is overrun, and don't pad-right if it's underrun.
111: *
112: * - TERMP_HANG: like TERMP_DANGLE, but doesn't newline when
113: * overruning, instead save the position and continue at that point
114: * when the next invocation.
1.1 kristaps 115: *
116: * In-line line breaking:
117: *
118: * If TERMP_NOBREAK is specified and the line overruns the right
119: * margin, it will break and pad-right to the right margin after
120: * writing. If maxrmargin is violated, it will break and continue
1.19 schwarze 121: * writing from the right-margin, which will lead to the above scenario
122: * upon exit. Otherwise, the line will break at the right margin.
1.1 kristaps 123: */
124: void
125: term_flushln(struct termp *p)
126: {
1.19 schwarze 127: int i; /* current input position in p->buf */
128: size_t vis; /* current visual position on output */
129: size_t vbl; /* number of blanks to prepend to output */
1.33 schwarze 130: size_t vend; /* end of word visual position on output */
1.19 schwarze 131: size_t bp; /* visual right border position */
1.42 ! schwarze 132: int j; /* temporary loop index for p->buf */
! 133: int jhy; /* last hyph before overflow w/r/t j */
! 134: size_t maxvis; /* output position of visible boundary */
! 135: size_t mmax; /* used in calculating bp */
1.1 kristaps 136:
137: /*
138: * First, establish the maximum columns of "visible" content.
139: * This is usually the difference between the right-margin and
140: * an indentation, but can be, for tagged lists or columns, a
1.19 schwarze 141: * small set of values.
1.1 kristaps 142: */
143:
144: assert(p->offset < p->rmargin);
1.9 schwarze 145:
1.26 schwarze 146: maxvis = (int)(p->rmargin - p->offset) - p->overstep < 0 ?
1.19 schwarze 147: /* LINTED */
1.26 schwarze 148: 0 : p->rmargin - p->offset - p->overstep;
149: mmax = (int)(p->maxrmargin - p->offset) - p->overstep < 0 ?
1.19 schwarze 150: /* LINTED */
1.26 schwarze 151: 0 : p->maxrmargin - p->offset - p->overstep;
1.9 schwarze 152:
1.1 kristaps 153: bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
1.19 schwarze 154:
1.33 schwarze 155: /*
156: * Indent the first line of a paragraph.
157: */
158: vbl = p->flags & TERMP_NOLPAD ? 0 : p->offset;
159:
1.42 ! schwarze 160: vis = vend = i = 0;
1.19 schwarze 161:
1.22 schwarze 162: while (i < (int)p->col) {
163: /*
1.42 ! schwarze 164: * Handle literal tab characters: collapse all
! 165: * subsequent tabs into a single huge set of spaces.
1.30 schwarze 166: */
167: for (j = i; j < (int)p->col; j++) {
168: if ('\t' != p->buf[j])
169: break;
1.42 ! schwarze 170: vend = (vis / p->tabwidth + 1) * p->tabwidth;
1.30 schwarze 171: vbl += vend - vis;
172: vis = vend;
173: }
1.22 schwarze 174:
1.1 kristaps 175: /*
176: * Count up visible word characters. Control sequences
177: * (starting with the CSI) aren't counted. A space
178: * generates a non-printing word, which is valid (the
179: * space is printed according to regular spacing rules).
180: */
181:
182: /* LINTED */
1.30 schwarze 183: for (jhy = 0; j < (int)p->col; j++) {
184: if ((j && ' ' == p->buf[j]) || '\t' == p->buf[j])
1.1 kristaps 185: break;
1.42 ! schwarze 186:
! 187: /* Back over the the last printed character. */
! 188: if (8 == p->buf[j]) {
! 189: assert(j);
! 190: vend -= (*p->width)(p, p->buf[j - 1]);
! 191: continue;
! 192: }
! 193:
! 194: /* Regular word. */
! 195: /* Break at the hyphen point if we overrun. */
! 196: if (vend > vis && vend < bp &&
! 197: ASCII_HYPH == p->buf[j])
! 198: jhy = j;
! 199:
! 200: vend += (*p->width)(p, p->buf[j]);
1.1 kristaps 201: }
202:
203: /*
1.5 schwarze 204: * Find out whether we would exceed the right margin.
1.33 schwarze 205: * If so, break to the next line.
1.5 schwarze 206: */
1.33 schwarze 207: if (vend > bp && 0 == jhy && vis > 0) {
1.22 schwarze 208: vend -= vis;
1.37 schwarze 209: (*p->endline)(p);
1.5 schwarze 210: if (TERMP_NOBREAK & p->flags) {
1.29 schwarze 211: p->viscol = p->rmargin;
1.37 schwarze 212: (*p->advance)(p, p->rmargin);
1.22 schwarze 213: vend += p->rmargin - p->offset;
1.5 schwarze 214: } else {
1.33 schwarze 215: p->viscol = 0;
216: vbl = p->offset;
1.5 schwarze 217: }
1.33 schwarze 218:
1.26 schwarze 219: /* Remove the p->overstep width. */
1.33 schwarze 220:
1.18 schwarze 221: bp += (int)/* LINTED */
1.26 schwarze 222: p->overstep;
223: p->overstep = 0;
1.1 kristaps 224: }
225:
1.3 schwarze 226: /*
1.30 schwarze 227: * Skip leading tabs, they were handled above.
228: */
229: while (i < (int)p->col && '\t' == p->buf[i])
230: i++;
231:
1.33 schwarze 232: /* Write out the [remaining] word. */
1.1 kristaps 233: for ( ; i < (int)p->col; i++) {
1.25 schwarze 234: if (vend > bp && jhy > 0 && i > jhy)
1.30 schwarze 235: break;
236: if ('\t' == p->buf[i])
1.1 kristaps 237: break;
1.22 schwarze 238: if (' ' == p->buf[i]) {
1.33 schwarze 239: while (' ' == p->buf[i]) {
1.42 ! schwarze 240: vbl += (*p->width)(p, p->buf[i]);
1.33 schwarze 241: i++;
242: }
1.22 schwarze 243: break;
244: }
1.33 schwarze 245: if (ASCII_NBRSP == p->buf[i]) {
1.42 ! schwarze 246: vbl += (*p->width)(p, ' ');
1.33 schwarze 247: continue;
248: }
249:
250: /*
251: * Now we definitely know there will be
252: * printable characters to output,
253: * so write preceding white space now.
254: */
255: if (vbl) {
1.37 schwarze 256: (*p->advance)(p, vbl);
1.33 schwarze 257: p->viscol += vbl;
258: vbl = 0;
259: }
1.35 schwarze 260:
1.42 ! schwarze 261: if (ASCII_HYPH == p->buf[i]) {
1.37 schwarze 262: (*p->letter)(p, '-');
1.42 ! schwarze 263: p->viscol += (*p->width)(p, '-');
! 264: } else {
1.37 schwarze 265: (*p->letter)(p, p->buf[i]);
1.42 ! schwarze 266: p->viscol += (*p->width)(p, p->buf[i]);
! 267: }
1.1 kristaps 268: }
1.33 schwarze 269: vend += vbl;
1.22 schwarze 270: vis = vend;
1.1 kristaps 271: }
1.18 schwarze 272:
1.9 schwarze 273: p->col = 0;
1.26 schwarze 274: p->overstep = 0;
1.1 kristaps 275:
1.9 schwarze 276: if ( ! (TERMP_NOBREAK & p->flags)) {
1.29 schwarze 277: p->viscol = 0;
1.37 schwarze 278: (*p->endline)(p);
1.1 kristaps 279: return;
280: }
281:
1.9 schwarze 282: if (TERMP_HANG & p->flags) {
283: /* We need one blank after the tag. */
1.26 schwarze 284: p->overstep = /* LINTED */
1.42 ! schwarze 285: vis - maxvis + (*p->width)(p, ' ');
1.9 schwarze 286:
287: /*
288: * Behave exactly the same way as groff:
289: * If we have overstepped the margin, temporarily move
290: * it to the right and flag the rest of the line to be
291: * shorter.
292: * If we landed right at the margin, be happy.
293: * If we are one step before the margin, temporarily
294: * move it one step LEFT and flag the rest of the line
295: * to be longer.
296: */
1.26 schwarze 297: if (p->overstep >= -1) {
298: assert((int)maxvis + p->overstep >= 0);
1.9 schwarze 299: /* LINTED */
1.26 schwarze 300: maxvis += p->overstep;
1.9 schwarze 301: } else
1.26 schwarze 302: p->overstep = 0;
1.9 schwarze 303:
304: } else if (TERMP_DANGLE & p->flags)
305: return;
1.1 kristaps 306:
1.9 schwarze 307: /* Right-pad. */
308: if (maxvis > vis + /* LINTED */
1.42 ! schwarze 309: ((TERMP_TWOSPACE & p->flags) ?
! 310: (*p->width)(p, ' ') : 0)) {
1.29 schwarze 311: p->viscol += maxvis - vis;
1.37 schwarze 312: (*p->advance)(p, maxvis - vis);
313: vis += (maxvis - vis);
1.29 schwarze 314: } else { /* ...or newline break. */
1.37 schwarze 315: (*p->endline)(p);
1.29 schwarze 316: p->viscol = p->rmargin;
1.37 schwarze 317: (*p->advance)(p, p->rmargin);
1.9 schwarze 318: }
1.1 kristaps 319: }
320:
321:
322: /*
323: * A newline only breaks an existing line; it won't assert vertical
324: * space. All data in the output buffer is flushed prior to the newline
325: * assertion.
326: */
327: void
328: term_newln(struct termp *p)
329: {
330:
331: p->flags |= TERMP_NOSPACE;
1.29 schwarze 332: if (0 == p->col && 0 == p->viscol) {
1.1 kristaps 333: p->flags &= ~TERMP_NOLPAD;
334: return;
335: }
336: term_flushln(p);
337: p->flags &= ~TERMP_NOLPAD;
338: }
339:
340:
341: /*
342: * Asserts a vertical space (a full, empty line-break between lines).
343: * Note that if used twice, this will cause two blank spaces and so on.
344: * All data in the output buffer is flushed prior to the newline
345: * assertion.
346: */
347: void
348: term_vspace(struct termp *p)
349: {
350:
351: term_newln(p);
1.29 schwarze 352: p->viscol = 0;
1.37 schwarze 353: (*p->endline)(p);
1.1 kristaps 354: }
355:
356:
357: static void
1.20 schwarze 358: spec(struct termp *p, const char *word, size_t len)
1.1 kristaps 359: {
360: const char *rhs;
361: size_t sz;
362:
1.15 schwarze 363: rhs = chars_a2ascii(p->symtab, word, len, &sz);
1.20 schwarze 364: if (rhs)
365: encode(p, rhs, sz);
1.11 schwarze 366: }
367:
368:
369: static void
1.20 schwarze 370: res(struct termp *p, const char *word, size_t len)
1.11 schwarze 371: {
372: const char *rhs;
373: size_t sz;
374:
1.15 schwarze 375: rhs = chars_a2res(p->symtab, word, len, &sz);
1.20 schwarze 376: if (rhs)
377: encode(p, rhs, sz);
378: }
379:
380:
381: void
382: term_fontlast(struct termp *p)
383: {
384: enum termfont f;
1.11 schwarze 385:
1.20 schwarze 386: f = p->fontl;
387: p->fontl = p->fontq[p->fonti];
388: p->fontq[p->fonti] = f;
389: }
390:
391:
392: void
393: term_fontrepl(struct termp *p, enum termfont f)
394: {
395:
396: p->fontl = p->fontq[p->fonti];
397: p->fontq[p->fonti] = f;
1.1 kristaps 398: }
399:
400:
1.20 schwarze 401: void
402: term_fontpush(struct termp *p, enum termfont f)
1.1 kristaps 403: {
1.7 schwarze 404:
1.20 schwarze 405: assert(p->fonti + 1 < 10);
406: p->fontl = p->fontq[p->fonti];
407: p->fontq[++p->fonti] = f;
408: }
1.1 kristaps 409:
410:
1.20 schwarze 411: const void *
412: term_fontq(struct termp *p)
413: {
1.1 kristaps 414:
1.20 schwarze 415: return(&p->fontq[p->fonti]);
416: }
1.1 kristaps 417:
418:
1.20 schwarze 419: enum termfont
420: term_fonttop(struct termp *p)
421: {
1.1 kristaps 422:
1.20 schwarze 423: return(p->fontq[p->fonti]);
424: }
1.7 schwarze 425:
426:
1.20 schwarze 427: void
428: term_fontpopq(struct termp *p, const void *key)
429: {
1.1 kristaps 430:
1.20 schwarze 431: while (p->fonti >= 0 && key != &p->fontq[p->fonti])
432: p->fonti--;
433: assert(p->fonti >= 0);
434: }
1.1 kristaps 435:
436:
1.20 schwarze 437: void
438: term_fontpop(struct termp *p)
439: {
1.1 kristaps 440:
1.20 schwarze 441: assert(p->fonti);
442: p->fonti--;
1.1 kristaps 443: }
444:
445:
446: /*
447: * Handle pwords, partial words, which may be either a single word or a
448: * phrase that cannot be broken down (such as a literal string). This
449: * handles word styling.
450: */
1.7 schwarze 451: void
452: term_word(struct termp *p, const char *word)
1.1 kristaps 453: {
1.20 schwarze 454: const char *sv, *seq;
455: int sz;
456: size_t ssz;
457: enum roffdeco deco;
1.1 kristaps 458:
1.14 schwarze 459: sv = word;
460:
1.20 schwarze 461: if (word[0] && '\0' == word[1])
1.14 schwarze 462: switch (word[0]) {
463: case('.'):
464: /* FALLTHROUGH */
465: case(','):
466: /* FALLTHROUGH */
467: case(';'):
468: /* FALLTHROUGH */
469: case(':'):
470: /* FALLTHROUGH */
471: case('?'):
472: /* FALLTHROUGH */
473: case('!'):
474: /* FALLTHROUGH */
475: case(')'):
476: /* FALLTHROUGH */
477: case(']'):
478: if ( ! (TERMP_IGNDELIM & p->flags))
479: p->flags |= TERMP_NOSPACE;
480: break;
481: default:
482: break;
483: }
1.1 kristaps 484:
1.31 schwarze 485: if ( ! (TERMP_NOSPACE & p->flags)) {
1.40 schwarze 486: if ( ! (TERMP_KEEP & p->flags)) {
487: if (TERMP_PREKEEP & p->flags)
488: p->flags |= TERMP_KEEP;
1.31 schwarze 489: bufferc(p, ' ');
1.40 schwarze 490: if (TERMP_SENTENCE & p->flags)
491: bufferc(p, ' ');
492: } else
493: bufferc(p, ASCII_NBRSP);
1.31 schwarze 494: }
1.1 kristaps 495:
496: if ( ! (p->flags & TERMP_NONOSPACE))
497: p->flags &= ~TERMP_NOSPACE;
498:
1.31 schwarze 499: p->flags &= ~TERMP_SENTENCE;
500:
1.20 schwarze 501: /* FIXME: use strcspn. */
502:
503: while (*word) {
504: if ('\\' != *word) {
505: encode(p, word, 1);
506: word++;
507: continue;
508: }
509:
510: seq = ++word;
511: sz = a2roffdeco(&deco, &seq, &ssz);
512:
513: switch (deco) {
514: case (DECO_RESERVED):
515: res(p, seq, ssz);
516: break;
517: case (DECO_SPECIAL):
518: spec(p, seq, ssz);
519: break;
520: case (DECO_BOLD):
521: term_fontrepl(p, TERMFONT_BOLD);
522: break;
523: case (DECO_ITALIC):
524: term_fontrepl(p, TERMFONT_UNDER);
525: break;
526: case (DECO_ROMAN):
527: term_fontrepl(p, TERMFONT_NONE);
528: break;
529: case (DECO_PREVIOUS):
530: term_fontlast(p);
531: break;
532: default:
533: break;
534: }
535:
536: word += sz;
537: if (DECO_NOSPACE == deco && '\0' == *word)
538: p->flags |= TERMP_NOSPACE;
539: }
1.1 kristaps 540:
1.31 schwarze 541: /*
542: * Note that we don't process the pipe: the parser sees it as
543: * punctuation, but we don't in terms of typography.
544: */
1.14 schwarze 545: if (sv[0] && 0 == sv[1])
546: switch (sv[0]) {
547: case('('):
548: /* FALLTHROUGH */
549: case('['):
550: p->flags |= TERMP_NOSPACE;
551: break;
552: default:
553: break;
554: }
1.1 kristaps 555: }
556:
557:
558: static void
1.20 schwarze 559: adjbuf(struct termp *p, size_t sz)
1.1 kristaps 560: {
561:
1.20 schwarze 562: if (0 == p->maxcols)
563: p->maxcols = 1024;
564: while (sz >= p->maxcols)
565: p->maxcols <<= 2;
566:
567: p->buf = realloc(p->buf, p->maxcols);
568: if (NULL == p->buf) {
569: perror(NULL);
570: exit(EXIT_FAILURE);
1.1 kristaps 571: }
572: }
573:
1.4 schwarze 574:
575: static void
1.20 schwarze 576: buffera(struct termp *p, const char *word, size_t sz)
577: {
578:
579: if (p->col + sz >= p->maxcols)
580: adjbuf(p, p->col + sz);
581:
582: memcpy(&p->buf[(int)p->col], word, sz);
583: p->col += sz;
584: }
585:
586:
587: static void
588: bufferc(struct termp *p, char c)
589: {
590:
591: if (p->col + 1 >= p->maxcols)
592: adjbuf(p, p->col + 1);
593:
594: p->buf[(int)p->col++] = c;
595: }
596:
597:
598: static void
599: encode(struct termp *p, const char *word, size_t sz)
1.4 schwarze 600: {
1.20 schwarze 601: enum termfont f;
602: int i;
603:
604: /*
605: * Encode and buffer a string of characters. If the current
606: * font mode is unset, buffer directly, else encode then buffer
607: * character by character.
608: */
609:
1.38 schwarze 610: if (TERMFONT_NONE == (f = term_fonttop(p))) {
1.20 schwarze 611: buffera(p, word, sz);
612: return;
613: }
614:
615: for (i = 0; i < (int)sz; i++) {
616: if ( ! isgraph((u_char)word[i])) {
617: bufferc(p, word[i]);
618: continue;
1.4 schwarze 619: }
1.20 schwarze 620:
621: if (TERMFONT_UNDER == f)
622: bufferc(p, '_');
623: else
624: bufferc(p, word[i]);
625:
626: bufferc(p, 8);
627: bufferc(p, word[i]);
1.4 schwarze 628: }
629: }
1.16 schwarze 630:
631:
632: size_t
1.39 schwarze 633: term_len(const struct termp *p, size_t sz)
634: {
635:
636: return((*p->width)(p, ' ') * sz);
637: }
638:
639:
640: size_t
641: term_strlen(const struct termp *p, const char *cp)
642: {
643: size_t sz;
644:
645: for (sz = 0; *cp; cp++)
646: sz += (*p->width)(p, *cp);
647:
648: return(sz);
649: }
650:
651:
652: size_t
653: term_vspan(const struct termp *p, const struct roffsu *su)
1.16 schwarze 654: {
655: double r;
656:
657: switch (su->unit) {
658: case (SCALE_CM):
659: r = su->scale * 2;
660: break;
661: case (SCALE_IN):
662: r = su->scale * 6;
663: break;
664: case (SCALE_PC):
665: r = su->scale;
666: break;
667: case (SCALE_PT):
668: r = su->scale / 8;
669: break;
670: case (SCALE_MM):
671: r = su->scale / 1000;
672: break;
673: case (SCALE_VS):
674: r = su->scale;
675: break;
676: default:
677: r = su->scale - 1;
678: break;
679: }
680:
681: if (r < 0.0)
682: r = 0.0;
683: return(/* LINTED */(size_t)
684: r);
685: }
686:
687:
688: size_t
1.39 schwarze 689: term_hspan(const struct termp *p, const struct roffsu *su)
1.16 schwarze 690: {
691: double r;
692:
693: /* XXX: CM, IN, and PT are approximations. */
694:
695: switch (su->unit) {
696: case (SCALE_CM):
697: r = 4 * su->scale;
698: break;
699: case (SCALE_IN):
700: /* XXX: this is an approximation. */
701: r = 10 * su->scale;
702: break;
703: case (SCALE_PC):
704: r = (10 * su->scale) / 6;
705: break;
706: case (SCALE_PT):
707: r = (10 * su->scale) / 72;
708: break;
709: case (SCALE_MM):
710: r = su->scale / 1000; /* FIXME: double-check. */
711: break;
712: case (SCALE_VS):
713: r = su->scale * 2 - 1; /* FIXME: double-check. */
714: break;
715: default:
716: r = su->scale;
717: break;
718: }
719:
720: if (r < 0.0)
721: r = 0.0;
722: return((size_t)/* LINTED */
723: r);
724: }
725:
726:
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