html.c

   1 /*      $Id: html.c,v 1.161 2014/08/13 15:25:22 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009, 2010, 2011 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 "libmandoc.h"
  34 #include "out.h"
  35 #include "html.h"
  36 #include "main.h"
  37
  38 struct  htmldata {
  39         const char       *name;
  40         int               flags;
  41 #define HTML_CLRLINE     (1 << 0)
  42 #define HTML_NOSTACK     (1 << 1)
  43 #define HTML_AUTOCLOSE   (1 << 2) /* Tag has auto-closure. */
  44 };
  45
  46 static  const struct htmldata htmltags[TAG_MAX] = {
  47         {"html",        HTML_CLRLINE}, /* TAG_HTML */
  48         {"head",        HTML_CLRLINE}, /* TAG_HEAD */
  49         {"body",        HTML_CLRLINE}, /* TAG_BODY */
  50         {"meta",        HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_META */
  51         {"title",       HTML_CLRLINE}, /* TAG_TITLE */
  52         {"div",         HTML_CLRLINE}, /* TAG_DIV */
  53         {"h1",          0}, /* TAG_H1 */
  54         {"h2",          0}, /* TAG_H2 */
  55         {"span",        0}, /* TAG_SPAN */
  56         {"link",        HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_LINK */
  57         {"br",          HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_BR */
  58         {"a",           0}, /* TAG_A */
  59         {"table",       HTML_CLRLINE}, /* TAG_TABLE */
  60         {"tbody",       HTML_CLRLINE}, /* TAG_TBODY */
  61         {"col",         HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_COL */
  62         {"tr",          HTML_CLRLINE}, /* TAG_TR */
  63         {"td",          HTML_CLRLINE}, /* TAG_TD */
  64         {"li",          HTML_CLRLINE}, /* TAG_LI */
  65         {"ul",          HTML_CLRLINE}, /* TAG_UL */
  66         {"ol",          HTML_CLRLINE}, /* TAG_OL */
  67         {"dl",          HTML_CLRLINE}, /* TAG_DL */
  68         {"dt",          HTML_CLRLINE}, /* TAG_DT */
  69         {"dd",          HTML_CLRLINE}, /* TAG_DD */
  70         {"blockquote",  HTML_CLRLINE}, /* TAG_BLOCKQUOTE */
  71         {"p",           HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_P */
  72         {"pre",         HTML_CLRLINE }, /* TAG_PRE */
  73         {"b",           0 }, /* TAG_B */
  74         {"i",           0 }, /* TAG_I */
  75         {"code",        0 }, /* TAG_CODE */
  76         {"small",       0 }, /* TAG_SMALL */
  77         {"em",          0 }, /* TAG_EM */
  78 };
  79
  80 static  const char      *const htmlattrs[ATTR_MAX] = {
  81         "http-equiv", /* ATTR_HTTPEQUIV */
  82         "content", /* ATTR_CONTENT */
  83         "name", /* ATTR_NAME */
  84         "rel", /* ATTR_REL */
  85         "href", /* ATTR_HREF */
  86         "type", /* ATTR_TYPE */
  87         "media", /* ATTR_MEDIA */
  88         "class", /* ATTR_CLASS */
  89         "style", /* ATTR_STYLE */
  90         "width", /* ATTR_WIDTH */
  91         "id", /* ATTR_ID */
  92         "summary", /* ATTR_SUMMARY */
  93         "align", /* ATTR_ALIGN */
  94         "colspan", /* ATTR_COLSPAN */
  95 };
  96
  97 static  const char      *const roffscales[SCALE_MAX] = {
  98         "cm", /* SCALE_CM */
  99         "in", /* SCALE_IN */
 100         "pc", /* SCALE_PC */
 101         "pt", /* SCALE_PT */
 102         "em", /* SCALE_EM */
 103         "em", /* SCALE_MM */
 104         "ex", /* SCALE_EN */
 105         "ex", /* SCALE_BU */
 106         "em", /* SCALE_VS */
 107         "ex", /* SCALE_FS */
 108 };
 109
 110 static  void     bufncat(struct html *, const char *, size_t);
 111 static  void     print_ctag(struct html *, enum htmltag);
 112 static  int      print_escape(char);
 113 static  int      print_encode(struct html *, const char *, int);
 114 static  void     print_metaf(struct html *, enum mandoc_esc);
 115 static  void     print_attr(struct html *, const char *, const char *);
 116 static  void     *ml_alloc(char *, enum htmltype);
 117
 118
 119 static void *
 120 ml_alloc(char *outopts, enum htmltype type)
 121 {
 122         struct html     *h;
 123         const char      *toks[5];
 124         char            *v;
 125
 126         toks[0] = "style";
 127         toks[1] = "man";
 128         toks[2] = "includes";
 129         toks[3] = "fragment";
 130         toks[4] = NULL;
 131
 132         h = mandoc_calloc(1, sizeof(struct html));
 133
 134         h->type = type;
 135         h->tags.head = NULL;
 136         h->symtab = mchars_alloc();
 137
 138         while (outopts && *outopts)
 139                 switch (getsubopt(&outopts, UNCONST(toks), &v)) {
 140                 case 0:
 141                         h->style = v;
 142                         break;
 143                 case 1:
 144                         h->base_man = v;
 145                         break;
 146                 case 2:
 147                         h->base_includes = v;
 148                         break;
 149                 case 3:
 150                         h->oflags |= HTML_FRAGMENT;
 151                         break;
 152                 default:
 153                         break;
 154                 }
 155
 156         return(h);
 157 }
 158
 159 void *
 160 html_alloc(char *outopts)
 161 {
 162
 163         return(ml_alloc(outopts, HTML_HTML_4_01_STRICT));
 164 }
 165
 166 void *
 167 xhtml_alloc(char *outopts)
 168 {
 169
 170         return(ml_alloc(outopts, HTML_XHTML_1_0_STRICT));
 171 }
 172
 173 void
 174 html_free(void *p)
 175 {
 176         struct tag      *tag;
 177         struct html     *h;
 178
 179         h = (struct html *)p;
 180
 181         while ((tag = h->tags.head) != NULL) {
 182                 h->tags.head = tag->next;
 183                 free(tag);
 184         }
 185
 186         if (h->symtab)
 187                 mchars_free(h->symtab);
 188
 189         free(h);
 190 }
 191
 192 void
 193 print_gen_head(struct html *h)
 194 {
 195         struct htmlpair  tag[4];
 196
 197         tag[0].key = ATTR_HTTPEQUIV;
 198         tag[0].val = "Content-Type";
 199         tag[1].key = ATTR_CONTENT;
 200         tag[1].val = "text/html; charset=utf-8";
 201         print_otag(h, TAG_META, 2, tag);
 202
 203         tag[0].key = ATTR_NAME;
 204         tag[0].val = "resource-type";
 205         tag[1].key = ATTR_CONTENT;
 206         tag[1].val = "document";
 207         print_otag(h, TAG_META, 2, tag);
 208
 209         if (h->style) {
 210                 tag[0].key = ATTR_REL;
 211                 tag[0].val = "stylesheet";
 212                 tag[1].key = ATTR_HREF;
 213                 tag[1].val = h->style;
 214                 tag[2].key = ATTR_TYPE;
 215                 tag[2].val = "text/css";
 216                 tag[3].key = ATTR_MEDIA;
 217                 tag[3].val = "all";
 218                 print_otag(h, TAG_LINK, 4, tag);
 219         }
 220 }
 221
 222 static void
 223 print_metaf(struct html *h, enum mandoc_esc deco)
 224 {
 225         enum htmlfont    font;
 226
 227         switch (deco) {
 228         case ESCAPE_FONTPREV:
 229                 font = h->metal;
 230                 break;
 231         case ESCAPE_FONTITALIC:
 232                 font = HTMLFONT_ITALIC;
 233                 break;
 234         case ESCAPE_FONTBOLD:
 235                 font = HTMLFONT_BOLD;
 236                 break;
 237         case ESCAPE_FONTBI:
 238                 font = HTMLFONT_BI;
 239                 break;
 240         case ESCAPE_FONT:
 241                 /* FALLTHROUGH */
 242         case ESCAPE_FONTROMAN:
 243                 font = HTMLFONT_NONE;
 244                 break;
 245         default:
 246                 abort();
 247                 /* NOTREACHED */
 248         }
 249
 250         if (h->metaf) {
 251                 print_tagq(h, h->metaf);
 252                 h->metaf = NULL;
 253         }
 254
 255         h->metal = h->metac;
 256         h->metac = font;
 257
 258         switch (font) {
 259         case HTMLFONT_ITALIC:
 260                 h->metaf = print_otag(h, TAG_I, 0, NULL);
 261                 break;
 262         case HTMLFONT_BOLD:
 263                 h->metaf = print_otag(h, TAG_B, 0, NULL);
 264                 break;
 265         case HTMLFONT_BI:
 266                 h->metaf = print_otag(h, TAG_B, 0, NULL);
 267                 print_otag(h, TAG_I, 0, NULL);
 268                 break;
 269         default:
 270                 break;
 271         }
 272 }
 273
 274 int
 275 html_strlen(const char *cp)
 276 {
 277         size_t           rsz;
 278         int              skip, sz;
 279
 280         /*
 281          * Account for escaped sequences within string length
 282          * calculations.  This follows the logic in term_strlen() as we
 283          * must calculate the width of produced strings.
 284          * Assume that characters are always width of "1".  This is
 285          * hacky, but it gets the job done for approximation of widths.
 286          */
 287
 288         sz = 0;
 289         skip = 0;
 290         while (1) {
 291                 rsz = strcspn(cp, "\\");
 292                 if (rsz) {
 293                         cp += rsz;
 294                         if (skip) {
 295                                 skip = 0;
 296                                 rsz--;
 297                         }
 298                         sz += rsz;
 299                 }
 300                 if ('\0' == *cp)
 301                         break;
 302                 cp++;
 303                 switch (mandoc_escape(&cp, NULL, NULL)) {
 304                 case ESCAPE_ERROR:
 305                         return(sz);
 306                 case ESCAPE_UNICODE:
 307                         /* FALLTHROUGH */
 308                 case ESCAPE_NUMBERED:
 309                         /* FALLTHROUGH */
 310                 case ESCAPE_SPECIAL:
 311                         if (skip)
 312                                 skip = 0;
 313                         else
 314                                 sz++;
 315                         break;
 316                 case ESCAPE_SKIPCHAR:
 317                         skip = 1;
 318                         break;
 319                 default:
 320                         break;
 321                 }
 322         }
 323         return(sz);
 324 }
 325
 326 static int
 327 print_escape(char c)
 328 {
 329
 330         switch (c) {
 331         case '<':
 332                 printf("&lt;");
 333                 break;
 334         case '>':
 335                 printf("&gt;");
 336                 break;
 337         case '&':
 338                 printf("&amp;");
 339                 break;
 340         case '"':
 341                 printf("&quot;");
 342                 break;
 343         case ASCII_NBRSP:
 344                 putchar('-');
 345                 break;
 346         case ASCII_HYPH:
 347                 putchar('-');
 348                 /* FALLTHROUGH */
 349         case ASCII_BREAK:
 350                 break;
 351         default:
 352                 return(0);
 353         }
 354         return(1);
 355 }
 356
 357 static int
 358 print_encode(struct html *h, const char *p, int norecurse)
 359 {
 360         size_t           sz;
 361         int              c, len, nospace;
 362         const char      *seq;
 363         enum mandoc_esc  esc;
 364         static const char rejs[9] = { '\\', '<', '>', '&', '"',
 365                 ASCII_NBRSP, ASCII_HYPH, ASCII_BREAK, '\0' };
 366
 367         nospace = 0;
 368
 369         while ('\0' != *p) {
 370                 if (HTML_SKIPCHAR & h->flags && '\\' != *p) {
 371                         h->flags &= ~HTML_SKIPCHAR;
 372                         p++;
 373                         continue;
 374                 }
 375
 376                 sz = strcspn(p, rejs);
 377
 378                 fwrite(p, 1, sz, stdout);
 379                 p += (int)sz;
 380
 381                 if ('\0' == *p)
 382                         break;
 383
 384                 if (print_escape(*p++))
 385                         continue;
 386
 387                 esc = mandoc_escape(&p, &seq, &len);
 388                 if (ESCAPE_ERROR == esc)
 389                         break;
 390
 391                 switch (esc) {
 392                 case ESCAPE_FONT:
 393                         /* FALLTHROUGH */
 394                 case ESCAPE_FONTPREV:
 395                         /* FALLTHROUGH */
 396                 case ESCAPE_FONTBOLD:
 397                         /* FALLTHROUGH */
 398                 case ESCAPE_FONTITALIC:
 399                         /* FALLTHROUGH */
 400                 case ESCAPE_FONTBI:
 401                         /* FALLTHROUGH */
 402                 case ESCAPE_FONTROMAN:
 403                         if (0 == norecurse)
 404                                 print_metaf(h, esc);
 405                         continue;
 406                 case ESCAPE_SKIPCHAR:
 407                         h->flags |= HTML_SKIPCHAR;
 408                         continue;
 409                 default:
 410                         break;
 411                 }
 412
 413                 if (h->flags & HTML_SKIPCHAR) {
 414                         h->flags &= ~HTML_SKIPCHAR;
 415                         continue;
 416                 }
 417
 418                 switch (esc) {
 419                 case ESCAPE_UNICODE:
 420                         /* Skip past "u" header. */
 421                         c = mchars_num2uc(seq + 1, len - 1);
 422                         if ('\0' != c)
 423                                 printf("&#x%x;", c);
 424                         break;
 425                 case ESCAPE_NUMBERED:
 426                         c = mchars_num2char(seq, len);
 427                         if ( ! ('\0' == c || print_escape(c)))
 428                                 putchar(c);
 429                         break;
 430                 case ESCAPE_SPECIAL:
 431                         c = mchars_spec2cp(h->symtab, seq, len);
 432                         if (c > 0)
 433                                 printf("&#%d;", c);
 434                         else if (-1 == c && 1 == len &&
 435                             !print_escape(*seq))
 436                                 putchar((int)*seq);
 437                         break;
 438                 case ESCAPE_NOSPACE:
 439                         if ('\0' == *p)
 440                                 nospace = 1;
 441                         break;
 442                 default:
 443                         break;
 444                 }
 445         }
 446
 447         return(nospace);
 448 }
 449
 450 static void
 451 print_attr(struct html *h, const char *key, const char *val)
 452 {
 453         printf(" %s=\"", key);
 454         (void)print_encode(h, val, 1);
 455         putchar('\"');
 456 }
 457
 458 struct tag *
 459 print_otag(struct html *h, enum htmltag tag,
 460                 int sz, const struct htmlpair *p)
 461 {
 462         int              i;
 463         struct tag      *t;
 464
 465         /* Push this tags onto the stack of open scopes. */
 466
 467         if ( ! (HTML_NOSTACK & htmltags[tag].flags)) {
 468                 t = mandoc_malloc(sizeof(struct tag));
 469                 t->tag = tag;
 470                 t->next = h->tags.head;
 471                 h->tags.head = t;
 472         } else
 473                 t = NULL;
 474
 475         if ( ! (HTML_NOSPACE & h->flags))
 476                 if ( ! (HTML_CLRLINE & htmltags[tag].flags)) {
 477                         /* Manage keeps! */
 478                         if ( ! (HTML_KEEP & h->flags)) {
 479                                 if (HTML_PREKEEP & h->flags)
 480                                         h->flags |= HTML_KEEP;
 481                                 putchar(' ');
 482                         } else
 483                                 printf("&#160;");
 484                 }
 485
 486         if ( ! (h->flags & HTML_NONOSPACE))
 487                 h->flags &= ~HTML_NOSPACE;
 488         else
 489                 h->flags |= HTML_NOSPACE;
 490
 491         /* Print out the tag name and attributes. */
 492
 493         printf("<%s", htmltags[tag].name);
 494         for (i = 0; i < sz; i++)
 495                 print_attr(h, htmlattrs[p[i].key], p[i].val);
 496
 497         /* Add non-overridable attributes. */
 498
 499         if (TAG_HTML == tag && HTML_XHTML_1_0_STRICT == h->type) {
 500                 print_attr(h, "xmlns", "http://www.w3.org/1999/xhtml");
 501                 print_attr(h, "xml:lang", "en");
 502                 print_attr(h, "lang", "en");
 503         }
 504
 505         /* Accommodate for XML "well-formed" singleton escaping. */
 506
 507         if (HTML_AUTOCLOSE & htmltags[tag].flags)
 508                 switch (h->type) {
 509                 case HTML_XHTML_1_0_STRICT:
 510                         putchar('/');
 511                         break;
 512                 default:
 513                         break;
 514                 }
 515
 516         putchar('>');
 517
 518         h->flags |= HTML_NOSPACE;
 519
 520         if ((HTML_AUTOCLOSE | HTML_CLRLINE) & htmltags[tag].flags)
 521                 putchar('\n');
 522
 523         return(t);
 524 }
 525
 526 static void
 527 print_ctag(struct html *h, enum htmltag tag)
 528 {
 529
 530         printf("</%s>", htmltags[tag].name);
 531         if (HTML_CLRLINE & htmltags[tag].flags) {
 532                 h->flags |= HTML_NOSPACE;
 533                 putchar('\n');
 534         }
 535 }
 536
 537 void
 538 print_gen_decls(struct html *h)
 539 {
 540         const char      *doctype;
 541         const char      *dtd;
 542         const char      *name;
 543
 544         switch (h->type) {
 545         case HTML_HTML_4_01_STRICT:
 546                 name = "HTML";
 547                 doctype = "-//W3C//DTD HTML 4.01//EN";
 548                 dtd = "http://www.w3.org/TR/html4/strict.dtd";
 549                 break;
 550         default:
 551                 puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
 552                 name = "html";
 553                 doctype = "-//W3C//DTD XHTML 1.0 Strict//EN";
 554                 dtd = "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";
 555                 break;
 556         }
 557
 558         printf("<!DOCTYPE %s PUBLIC \"%s\" \"%s\">\n",
 559             name, doctype, dtd);
 560 }
 561
 562 void
 563 print_text(struct html *h, const char *word)
 564 {
 565
 566         if ( ! (HTML_NOSPACE & h->flags)) {
 567                 /* Manage keeps! */
 568                 if ( ! (HTML_KEEP & h->flags)) {
 569                         if (HTML_PREKEEP & h->flags)
 570                                 h->flags |= HTML_KEEP;
 571                         putchar(' ');
 572                 } else
 573                         printf("&#160;");
 574         }
 575
 576         assert(NULL == h->metaf);
 577         switch (h->metac) {
 578         case HTMLFONT_ITALIC:
 579                 h->metaf = print_otag(h, TAG_I, 0, NULL);
 580                 break;
 581         case HTMLFONT_BOLD:
 582                 h->metaf = print_otag(h, TAG_B, 0, NULL);
 583                 break;
 584         case HTMLFONT_BI:
 585                 h->metaf = print_otag(h, TAG_B, 0, NULL);
 586                 print_otag(h, TAG_I, 0, NULL);
 587                 break;
 588         default:
 589                 break;
 590         }
 591
 592         assert(word);
 593         if ( ! print_encode(h, word, 0)) {
 594                 if ( ! (h->flags & HTML_NONOSPACE))
 595                         h->flags &= ~HTML_NOSPACE;
 596         } else
 597                 h->flags |= HTML_NOSPACE;
 598
 599         if (h->metaf) {
 600                 print_tagq(h, h->metaf);
 601                 h->metaf = NULL;
 602         }
 603
 604         h->flags &= ~HTML_IGNDELIM;
 605 }
 606
 607 void
 608 print_tagq(struct html *h, const struct tag *until)
 609 {
 610         struct tag      *tag;
 611
 612         while ((tag = h->tags.head) != NULL) {
 613                 /*
 614                  * Remember to close out and nullify the current
 615                  * meta-font and table, if applicable.
 616                  */
 617                 if (tag == h->metaf)
 618                         h->metaf = NULL;
 619                 if (tag == h->tblt)
 620                         h->tblt = NULL;
 621                 print_ctag(h, tag->tag);
 622                 h->tags.head = tag->next;
 623                 free(tag);
 624                 if (until && tag == until)
 625                         return;
 626         }
 627 }
 628
 629 void
 630 print_stagq(struct html *h, const struct tag *suntil)
 631 {
 632         struct tag      *tag;
 633
 634         while ((tag = h->tags.head) != NULL) {
 635                 if (suntil && tag == suntil)
 636                         return;
 637                 /*
 638                  * Remember to close out and nullify the current
 639                  * meta-font and table, if applicable.
 640                  */
 641                 if (tag == h->metaf)
 642                         h->metaf = NULL;
 643                 if (tag == h->tblt)
 644                         h->tblt = NULL;
 645                 print_ctag(h, tag->tag);
 646                 h->tags.head = tag->next;
 647                 free(tag);
 648         }
 649 }
 650
 651 void
 652 bufinit(struct html *h)
 653 {
 654
 655         h->buf[0] = '\0';
 656         h->buflen = 0;
 657 }
 658
 659 void
 660 bufcat_style(struct html *h, const char *key, const char *val)
 661 {
 662
 663         bufcat(h, key);
 664         bufcat(h, ":");
 665         bufcat(h, val);
 666         bufcat(h, ";");
 667 }
 668
 669 void
 670 bufcat(struct html *h, const char *p)
 671 {
 672
 673         /*
 674          * XXX This is broken and not easy to fix.
 675          * When using the -Oincludes option, buffmt_includes()
 676          * may pass in strings overrunning BUFSIZ, causing a crash.
 677          */
 678
 679         h->buflen = strlcat(h->buf, p, BUFSIZ);
 680         assert(h->buflen < BUFSIZ);
 681 }
 682
 683 void
 684 bufcat_fmt(struct html *h, const char *fmt, ...)
 685 {
 686         va_list          ap;
 687
 688         va_start(ap, fmt);
 689         (void)vsnprintf(h->buf + (int)h->buflen,
 690             BUFSIZ - h->buflen - 1, fmt, ap);
 691         va_end(ap);
 692         h->buflen = strlen(h->buf);
 693 }
 694
 695 static void
 696 bufncat(struct html *h, const char *p, size_t sz)
 697 {
 698
 699         assert(h->buflen + sz + 1 < BUFSIZ);
 700         strncat(h->buf, p, sz);
 701         h->buflen += sz;
 702 }
 703
 704 void
 705 buffmt_includes(struct html *h, const char *name)
 706 {
 707         const char      *p, *pp;
 708
 709         pp = h->base_includes;
 710
 711         bufinit(h);
 712         while (NULL != (p = strchr(pp, '%'))) {
 713                 bufncat(h, pp, (size_t)(p - pp));
 714                 switch (*(p + 1)) {
 715                 case'I':
 716                         bufcat(h, name);
 717                         break;
 718                 default:
 719                         bufncat(h, p, 2);
 720                         break;
 721                 }
 722                 pp = p + 2;
 723         }
 724         if (pp)
 725                 bufcat(h, pp);
 726 }
 727
 728 void
 729 buffmt_man(struct html *h, const char *name, const char *sec)
 730 {
 731         const char      *p, *pp;
 732
 733         pp = h->base_man;
 734
 735         bufinit(h);
 736         while (NULL != (p = strchr(pp, '%'))) {
 737                 bufncat(h, pp, (size_t)(p - pp));
 738                 switch (*(p + 1)) {
 739                 case 'S':
 740                         bufcat(h, sec ? sec : "1");
 741                         break;
 742                 case 'N':
 743                         bufcat_fmt(h, "%s", name);
 744                         break;
 745                 default:
 746                         bufncat(h, p, 2);
 747                         break;
 748                 }
 749                 pp = p + 2;
 750         }
 751         if (pp)
 752                 bufcat(h, pp);
 753 }
 754
 755 void
 756 bufcat_su(struct html *h, const char *p, const struct roffsu *su)
 757 {
 758         double           v;
 759
 760         v = su->scale;
 761         if (SCALE_MM == su->unit && 0.0 == (v /= 100.0))
 762                 v = 1.0;
 763
 764         bufcat_fmt(h, "%s: %.2f%s;", p, v, roffscales[su->unit]);
 765 }
 766
 767 void
 768 bufcat_id(struct html *h, const char *src)
 769 {
 770
 771         /* Cf. <http://www.w3.org/TR/html4/types.html#h-6.2>. */
 772
 773         while ('\0' != *src)
 774                 bufcat_fmt(h, "%.2x", *src++);
 775 }