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Don't dereference NULL pointers when formatting missing denominators,
[mandoc.git] / html.c
1 /* $Id: html.c,v 1.184 2014/12/20 00:20:11 schwarze Exp $ */
2 /*
3 * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
4 * Copyright (c) 2011, 2012, 2013, 2014 Ingo Schwarze <schwarze@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
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.
17 */
18 #include "config.h"
19
20 #include <sys/types.h>
21
22 #include <assert.h>
23 #include <ctype.h>
24 #include <stdarg.h>
25 #include <stdio.h>
26 #include <stdint.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <unistd.h>
30
31 #include "mandoc.h"
32 #include "mandoc_aux.h"
33 #include "out.h"
34 #include "html.h"
35 #include "main.h"
36
37 struct htmldata {
38 const char *name;
39 int flags;
40 #define HTML_CLRLINE (1 << 0)
41 #define HTML_NOSTACK (1 << 1)
42 #define HTML_AUTOCLOSE (1 << 2) /* Tag has auto-closure. */
43 };
44
45 static const struct htmldata htmltags[TAG_MAX] = {
46 {"html", HTML_CLRLINE}, /* TAG_HTML */
47 {"head", HTML_CLRLINE}, /* TAG_HEAD */
48 {"body", HTML_CLRLINE}, /* TAG_BODY */
49 {"meta", HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_META */
50 {"title", HTML_CLRLINE}, /* TAG_TITLE */
51 {"div", HTML_CLRLINE}, /* TAG_DIV */
52 {"h1", 0}, /* TAG_H1 */
53 {"h2", 0}, /* TAG_H2 */
54 {"span", 0}, /* TAG_SPAN */
55 {"link", HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_LINK */
56 {"br", HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_BR */
57 {"a", 0}, /* TAG_A */
58 {"table", HTML_CLRLINE}, /* TAG_TABLE */
59 {"tbody", HTML_CLRLINE}, /* TAG_TBODY */
60 {"col", HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_COL */
61 {"tr", HTML_CLRLINE}, /* TAG_TR */
62 {"td", HTML_CLRLINE}, /* TAG_TD */
63 {"li", HTML_CLRLINE}, /* TAG_LI */
64 {"ul", HTML_CLRLINE}, /* TAG_UL */
65 {"ol", HTML_CLRLINE}, /* TAG_OL */
66 {"dl", HTML_CLRLINE}, /* TAG_DL */
67 {"dt", HTML_CLRLINE}, /* TAG_DT */
68 {"dd", HTML_CLRLINE}, /* TAG_DD */
69 {"blockquote", HTML_CLRLINE}, /* TAG_BLOCKQUOTE */
70 {"pre", HTML_CLRLINE }, /* TAG_PRE */
71 {"b", 0 }, /* TAG_B */
72 {"i", 0 }, /* TAG_I */
73 {"code", 0 }, /* TAG_CODE */
74 {"small", 0 }, /* TAG_SMALL */
75 {"style", HTML_CLRLINE}, /* TAG_STYLE */
76 {"math", HTML_CLRLINE}, /* TAG_MATH */
77 {"mrow", 0}, /* TAG_MROW */
78 {"mi", 0}, /* TAG_MI */
79 {"mo", 0}, /* TAG_MO */
80 {"msup", 0}, /* TAG_MSUP */
81 {"msub", 0}, /* TAG_MSUB */
82 {"msubsup", 0}, /* TAG_MSUBSUP */
83 {"mfrac", 0}, /* TAG_MFRAC */
84 {"msqrt", 0}, /* TAG_MSQRT */
85 {"mfenced", 0}, /* TAG_MFENCED */
86 {"mtable", 0}, /* TAG_MTABLE */
87 {"mtr", 0}, /* TAG_MTR */
88 {"mtd", 0}, /* TAG_MTD */
89 {"munderover", 0}, /* TAG_MUNDEROVER */
90 {"munder", 0}, /* TAG_MUNDER*/
91 {"mover", 0}, /* TAG_MOVER*/
92 };
93
94 static const char *const htmlattrs[ATTR_MAX] = {
95 "name", /* ATTR_NAME */
96 "rel", /* ATTR_REL */
97 "href", /* ATTR_HREF */
98 "type", /* ATTR_TYPE */
99 "media", /* ATTR_MEDIA */
100 "class", /* ATTR_CLASS */
101 "style", /* ATTR_STYLE */
102 "id", /* ATTR_ID */
103 "colspan", /* ATTR_COLSPAN */
104 "charset", /* ATTR_CHARSET */
105 "open", /* ATTR_OPEN */
106 "close", /* ATTR_CLOSE */
107 "mathvariant", /* ATTR_MATHVARIANT */
108 };
109
110 static const char *const roffscales[SCALE_MAX] = {
111 "cm", /* SCALE_CM */
112 "in", /* SCALE_IN */
113 "pc", /* SCALE_PC */
114 "pt", /* SCALE_PT */
115 "em", /* SCALE_EM */
116 "em", /* SCALE_MM */
117 "ex", /* SCALE_EN */
118 "ex", /* SCALE_BU */
119 "em", /* SCALE_VS */
120 "ex", /* SCALE_FS */
121 };
122
123 static void bufncat(struct html *, const char *, size_t);
124 static void print_ctag(struct html *, struct tag *);
125 static int print_escape(char);
126 static int print_encode(struct html *, const char *, int);
127 static void print_metaf(struct html *, enum mandoc_esc);
128 static void print_attr(struct html *, const char *, const char *);
129
130
131 void *
132 html_alloc(const struct mchars *mchars, char *outopts)
133 {
134 struct html *h;
135 const char *toks[5];
136 char *v;
137
138 toks[0] = "style";
139 toks[1] = "man";
140 toks[2] = "includes";
141 toks[3] = "fragment";
142 toks[4] = NULL;
143
144 h = mandoc_calloc(1, sizeof(struct html));
145
146 h->tags.head = NULL;
147 h->symtab = mchars;
148
149 while (outopts && *outopts)
150 switch (getsubopt(&outopts, UNCONST(toks), &v)) {
151 case 0:
152 h->style = v;
153 break;
154 case 1:
155 h->base_man = v;
156 break;
157 case 2:
158 h->base_includes = v;
159 break;
160 case 3:
161 h->oflags |= HTML_FRAGMENT;
162 break;
163 default:
164 break;
165 }
166
167 return(h);
168 }
169
170 void
171 html_free(void *p)
172 {
173 struct tag *tag;
174 struct html *h;
175
176 h = (struct html *)p;
177
178 while ((tag = h->tags.head) != NULL) {
179 h->tags.head = tag->next;
180 free(tag);
181 }
182
183 free(h);
184 }
185
186 void
187 print_gen_head(struct html *h)
188 {
189 struct htmlpair tag[4];
190 struct tag *t;
191
192 tag[0].key = ATTR_CHARSET;
193 tag[0].val = "utf-8";
194 print_otag(h, TAG_META, 1, tag);
195
196 /*
197 * Print a default style-sheet.
198 */
199 t = print_otag(h, TAG_STYLE, 0, NULL);
200 print_text(h, "table.head, table.foot { width: 100%; }\n"
201 "td.head-rtitle, td.foot-os { text-align: right; }\n"
202 "td.head-vol { text-align: center; }\n"
203 "table.foot td { width: 50%; }\n"
204 "table.head td { width: 33%; }\n"
205 "div.spacer { margin: 1em 0; }\n");
206 print_tagq(h, t);
207
208 if (h->style) {
209 tag[0].key = ATTR_REL;
210 tag[0].val = "stylesheet";
211 tag[1].key = ATTR_HREF;
212 tag[1].val = h->style;
213 tag[2].key = ATTR_TYPE;
214 tag[2].val = "text/css";
215 tag[3].key = ATTR_MEDIA;
216 tag[3].val = "all";
217 print_otag(h, TAG_LINK, 4, tag);
218 }
219 }
220
221 static void
222 print_metaf(struct html *h, enum mandoc_esc deco)
223 {
224 enum htmlfont font;
225
226 switch (deco) {
227 case ESCAPE_FONTPREV:
228 font = h->metal;
229 break;
230 case ESCAPE_FONTITALIC:
231 font = HTMLFONT_ITALIC;
232 break;
233 case ESCAPE_FONTBOLD:
234 font = HTMLFONT_BOLD;
235 break;
236 case ESCAPE_FONTBI:
237 font = HTMLFONT_BI;
238 break;
239 case ESCAPE_FONT:
240 /* FALLTHROUGH */
241 case ESCAPE_FONTROMAN:
242 font = HTMLFONT_NONE;
243 break;
244 default:
245 abort();
246 /* NOTREACHED */
247 }
248
249 if (h->metaf) {
250 print_tagq(h, h->metaf);
251 h->metaf = NULL;
252 }
253
254 h->metal = h->metac;
255 h->metac = font;
256
257 switch (font) {
258 case HTMLFONT_ITALIC:
259 h->metaf = print_otag(h, TAG_I, 0, NULL);
260 break;
261 case HTMLFONT_BOLD:
262 h->metaf = print_otag(h, TAG_B, 0, NULL);
263 break;
264 case HTMLFONT_BI:
265 h->metaf = print_otag(h, TAG_B, 0, NULL);
266 print_otag(h, TAG_I, 0, NULL);
267 break;
268 default:
269 break;
270 }
271 }
272
273 int
274 html_strlen(const char *cp)
275 {
276 size_t rsz;
277 int skip, sz;
278
279 /*
280 * Account for escaped sequences within string length
281 * calculations. This follows the logic in term_strlen() as we
282 * must calculate the width of produced strings.
283 * Assume that characters are always width of "1". This is
284 * hacky, but it gets the job done for approximation of widths.
285 */
286
287 sz = 0;
288 skip = 0;
289 while (1) {
290 rsz = strcspn(cp, "\\");
291 if (rsz) {
292 cp += rsz;
293 if (skip) {
294 skip = 0;
295 rsz--;
296 }
297 sz += rsz;
298 }
299 if ('\0' == *cp)
300 break;
301 cp++;
302 switch (mandoc_escape(&cp, NULL, NULL)) {
303 case ESCAPE_ERROR:
304 return(sz);
305 case ESCAPE_UNICODE:
306 /* FALLTHROUGH */
307 case ESCAPE_NUMBERED:
308 /* FALLTHROUGH */
309 case ESCAPE_SPECIAL:
310 if (skip)
311 skip = 0;
312 else
313 sz++;
314 break;
315 case ESCAPE_SKIPCHAR:
316 skip = 1;
317 break;
318 default:
319 break;
320 }
321 }
322 return(sz);
323 }
324
325 static int
326 print_escape(char c)
327 {
328
329 switch (c) {
330 case '<':
331 printf("&lt;");
332 break;
333 case '>':
334 printf("&gt;");
335 break;
336 case '&':
337 printf("&amp;");
338 break;
339 case '"':
340 printf("&quot;");
341 break;
342 case ASCII_NBRSP:
343 putchar('-');
344 break;
345 case ASCII_HYPH:
346 putchar('-');
347 /* FALLTHROUGH */
348 case ASCII_BREAK:
349 break;
350 default:
351 return(0);
352 }
353 return(1);
354 }
355
356 static int
357 print_encode(struct html *h, const char *p, int norecurse)
358 {
359 size_t sz;
360 int c, len, nospace;
361 const char *seq;
362 enum mandoc_esc esc;
363 static const char rejs[9] = { '\\', '<', '>', '&', '"',
364 ASCII_NBRSP, ASCII_HYPH, ASCII_BREAK, '\0' };
365
366 nospace = 0;
367
368 while ('\0' != *p) {
369 if (HTML_SKIPCHAR & h->flags && '\\' != *p) {
370 h->flags &= ~HTML_SKIPCHAR;
371 p++;
372 continue;
373 }
374
375 sz = strcspn(p, rejs);
376
377 fwrite(p, 1, sz, stdout);
378 p += (int)sz;
379
380 if ('\0' == *p)
381 break;
382
383 if (print_escape(*p++))
384 continue;
385
386 esc = mandoc_escape(&p, &seq, &len);
387 if (ESCAPE_ERROR == esc)
388 break;
389
390 switch (esc) {
391 case ESCAPE_FONT:
392 /* FALLTHROUGH */
393 case ESCAPE_FONTPREV:
394 /* FALLTHROUGH */
395 case ESCAPE_FONTBOLD:
396 /* FALLTHROUGH */
397 case ESCAPE_FONTITALIC:
398 /* FALLTHROUGH */
399 case ESCAPE_FONTBI:
400 /* FALLTHROUGH */
401 case ESCAPE_FONTROMAN:
402 if (0 == norecurse)
403 print_metaf(h, esc);
404 continue;
405 case ESCAPE_SKIPCHAR:
406 h->flags |= HTML_SKIPCHAR;
407 continue;
408 default:
409 break;
410 }
411
412 if (h->flags & HTML_SKIPCHAR) {
413 h->flags &= ~HTML_SKIPCHAR;
414 continue;
415 }
416
417 switch (esc) {
418 case ESCAPE_UNICODE:
419 /* Skip past "u" header. */
420 c = mchars_num2uc(seq + 1, len - 1);
421 break;
422 case ESCAPE_NUMBERED:
423 c = mchars_num2char(seq, len);
424 if (c < 0)
425 continue;
426 break;
427 case ESCAPE_SPECIAL:
428 c = mchars_spec2cp(h->symtab, seq, len);
429 if (c <= 0)
430 continue;
431 break;
432 case ESCAPE_NOSPACE:
433 if ('\0' == *p)
434 nospace = 1;
435 continue;
436 default:
437 continue;
438 }
439 if ((c < 0x20 && c != 0x09) ||
440 (c > 0x7E && c < 0xA0))
441 c = 0xFFFD;
442 if (c > 0x7E)
443 printf("&#%d;", c);
444 else if ( ! print_escape(c))
445 putchar(c);
446 }
447
448 return(nospace);
449 }
450
451 static void
452 print_attr(struct html *h, const char *key, const char *val)
453 {
454 printf(" %s=\"", key);
455 (void)print_encode(h, val, 1);
456 putchar('\"');
457 }
458
459 struct tag *
460 print_otag(struct html *h, enum htmltag tag,
461 int sz, const struct htmlpair *p)
462 {
463 int i;
464 struct tag *t;
465
466 /* Push this tags onto the stack of open scopes. */
467
468 if ( ! (HTML_NOSTACK & htmltags[tag].flags)) {
469 t = mandoc_malloc(sizeof(struct tag));
470 t->tag = tag;
471 t->next = h->tags.head;
472 h->tags.head = t;
473 } else
474 t = NULL;
475
476 if ( ! (HTML_NOSPACE & h->flags))
477 if ( ! (HTML_CLRLINE & htmltags[tag].flags)) {
478 /* Manage keeps! */
479 if ( ! (HTML_KEEP & h->flags)) {
480 if (HTML_PREKEEP & h->flags)
481 h->flags |= HTML_KEEP;
482 putchar(' ');
483 } else
484 printf("&#160;");
485 }
486
487 if ( ! (h->flags & HTML_NONOSPACE))
488 h->flags &= ~HTML_NOSPACE;
489 else
490 h->flags |= HTML_NOSPACE;
491
492 /* Print out the tag name and attributes. */
493
494 printf("<%s", htmltags[tag].name);
495 for (i = 0; i < sz; i++)
496 print_attr(h, htmlattrs[p[i].key], p[i].val);
497
498 /* Accommodate for "well-formed" singleton escaping. */
499
500 if (HTML_AUTOCLOSE & htmltags[tag].flags)
501 putchar('/');
502
503 putchar('>');
504
505 h->flags |= HTML_NOSPACE;
506
507 if ((HTML_AUTOCLOSE | HTML_CLRLINE) & htmltags[tag].flags)
508 putchar('\n');
509
510 return(t);
511 }
512
513 static void
514 print_ctag(struct html *h, struct tag *tag)
515 {
516
517 /*
518 * Remember to close out and nullify the current
519 * meta-font and table, if applicable.
520 */
521 if (tag == h->metaf)
522 h->metaf = NULL;
523 if (tag == h->tblt)
524 h->tblt = NULL;
525
526 printf("</%s>", htmltags[tag->tag].name);
527 if (HTML_CLRLINE & htmltags[tag->tag].flags) {
528 h->flags |= HTML_NOSPACE;
529 putchar('\n');
530 }
531
532 h->tags.head = tag->next;
533 free(tag);
534 }
535
536 void
537 print_gen_decls(struct html *h)
538 {
539
540 puts("<!DOCTYPE html>");
541 }
542
543 void
544 print_text(struct html *h, const char *word)
545 {
546
547 if ( ! (HTML_NOSPACE & h->flags)) {
548 /* Manage keeps! */
549 if ( ! (HTML_KEEP & h->flags)) {
550 if (HTML_PREKEEP & h->flags)
551 h->flags |= HTML_KEEP;
552 putchar(' ');
553 } else
554 printf("&#160;");
555 }
556
557 assert(NULL == h->metaf);
558 switch (h->metac) {
559 case HTMLFONT_ITALIC:
560 h->metaf = print_otag(h, TAG_I, 0, NULL);
561 break;
562 case HTMLFONT_BOLD:
563 h->metaf = print_otag(h, TAG_B, 0, NULL);
564 break;
565 case HTMLFONT_BI:
566 h->metaf = print_otag(h, TAG_B, 0, NULL);
567 print_otag(h, TAG_I, 0, NULL);
568 break;
569 default:
570 break;
571 }
572
573 assert(word);
574 if ( ! print_encode(h, word, 0)) {
575 if ( ! (h->flags & HTML_NONOSPACE))
576 h->flags &= ~HTML_NOSPACE;
577 h->flags &= ~HTML_NONEWLINE;
578 } else
579 h->flags |= HTML_NOSPACE | HTML_NONEWLINE;
580
581 if (h->metaf) {
582 print_tagq(h, h->metaf);
583 h->metaf = NULL;
584 }
585
586 h->flags &= ~HTML_IGNDELIM;
587 }
588
589 void
590 print_tagq(struct html *h, const struct tag *until)
591 {
592 struct tag *tag;
593
594 while ((tag = h->tags.head) != NULL) {
595 print_ctag(h, tag);
596 if (until && tag == until)
597 return;
598 }
599 }
600
601 void
602 print_stagq(struct html *h, const struct tag *suntil)
603 {
604 struct tag *tag;
605
606 while ((tag = h->tags.head) != NULL) {
607 if (suntil && tag == suntil)
608 return;
609 print_ctag(h, tag);
610 }
611 }
612
613 void
614 print_paragraph(struct html *h)
615 {
616 struct tag *t;
617 struct htmlpair tag;
618
619 PAIR_CLASS_INIT(&tag, "spacer");
620 t = print_otag(h, TAG_DIV, 1, &tag);
621 print_tagq(h, t);
622 }
623
624
625 void
626 bufinit(struct html *h)
627 {
628
629 h->buf[0] = '\0';
630 h->buflen = 0;
631 }
632
633 void
634 bufcat_style(struct html *h, const char *key, const char *val)
635 {
636
637 bufcat(h, key);
638 bufcat(h, ":");
639 bufcat(h, val);
640 bufcat(h, ";");
641 }
642
643 void
644 bufcat(struct html *h, const char *p)
645 {
646
647 /*
648 * XXX This is broken and not easy to fix.
649 * When using the -Oincludes option, buffmt_includes()
650 * may pass in strings overrunning BUFSIZ, causing a crash.
651 */
652
653 h->buflen = strlcat(h->buf, p, BUFSIZ);
654 assert(h->buflen < BUFSIZ);
655 }
656
657 void
658 bufcat_fmt(struct html *h, const char *fmt, ...)
659 {
660 va_list ap;
661
662 va_start(ap, fmt);
663 (void)vsnprintf(h->buf + (int)h->buflen,
664 BUFSIZ - h->buflen - 1, fmt, ap);
665 va_end(ap);
666 h->buflen = strlen(h->buf);
667 }
668
669 static void
670 bufncat(struct html *h, const char *p, size_t sz)
671 {
672
673 assert(h->buflen + sz + 1 < BUFSIZ);
674 strncat(h->buf, p, sz);
675 h->buflen += sz;
676 }
677
678 void
679 buffmt_includes(struct html *h, const char *name)
680 {
681 const char *p, *pp;
682
683 pp = h->base_includes;
684
685 bufinit(h);
686 while (NULL != (p = strchr(pp, '%'))) {
687 bufncat(h, pp, (size_t)(p - pp));
688 switch (*(p + 1)) {
689 case'I':
690 bufcat(h, name);
691 break;
692 default:
693 bufncat(h, p, 2);
694 break;
695 }
696 pp = p + 2;
697 }
698 if (pp)
699 bufcat(h, pp);
700 }
701
702 void
703 buffmt_man(struct html *h, const char *name, const char *sec)
704 {
705 const char *p, *pp;
706
707 pp = h->base_man;
708
709 bufinit(h);
710 while (NULL != (p = strchr(pp, '%'))) {
711 bufncat(h, pp, (size_t)(p - pp));
712 switch (*(p + 1)) {
713 case 'S':
714 bufcat(h, sec ? sec : "1");
715 break;
716 case 'N':
717 bufcat_fmt(h, "%s", name);
718 break;
719 default:
720 bufncat(h, p, 2);
721 break;
722 }
723 pp = p + 2;
724 }
725 if (pp)
726 bufcat(h, pp);
727 }
728
729 void
730 bufcat_su(struct html *h, const char *p, const struct roffsu *su)
731 {
732 double v;
733
734 v = su->scale;
735 if (SCALE_MM == su->unit && 0.0 == (v /= 100.0))
736 v = 1.0;
737 else if (SCALE_BU == su->unit)
738 v /= 24.0;
739
740 bufcat_fmt(h, "%s: %.2f%s;", p, v, roffscales[su->unit]);
741 }
742
743 void
744 bufcat_id(struct html *h, const char *src)
745 {
746
747 /* Cf. <http://www.w3.org/TR/html4/types.html#h-6.2>. */
748
749 while ('\0' != *src)
750 bufcat_fmt(h, "%.2x", *src++);
751 }
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