contrib/mdocml/html.c

   1 /*      $Id: html.c,v 1.183 2014/12/02 10:08:06 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 *, enum htmltag);
 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, enum htmltag tag)
 515 {
 516
 517         printf("</%s>", htmltags[tag].name);
 518         if (HTML_CLRLINE & htmltags[tag].flags) {
 519                 h->flags |= HTML_NOSPACE;
 520                 putchar('\n');
 521         }
 522 }
 523
 524 void
 525 print_gen_decls(struct html *h)
 526 {
 527
 528         puts("<!DOCTYPE html>");
 529 }
 530
 531 void
 532 print_text(struct html *h, const char *word)
 533 {
 534
 535         if ( ! (HTML_NOSPACE & h->flags)) {
 536                 /* Manage keeps! */
 537                 if ( ! (HTML_KEEP & h->flags)) {
 538                         if (HTML_PREKEEP & h->flags)
 539                                 h->flags |= HTML_KEEP;
 540                         putchar(' ');
 541                 } else
 542                         printf("&#160;");
 543         }
 544
 545         assert(NULL == h->metaf);
 546         switch (h->metac) {
 547         case HTMLFONT_ITALIC:
 548                 h->metaf = print_otag(h, TAG_I, 0, NULL);
 549                 break;
 550         case HTMLFONT_BOLD:
 551                 h->metaf = print_otag(h, TAG_B, 0, NULL);
 552                 break;
 553         case HTMLFONT_BI:
 554                 h->metaf = print_otag(h, TAG_B, 0, NULL);
 555                 print_otag(h, TAG_I, 0, NULL);
 556                 break;
 557         default:
 558                 break;
 559         }
 560
 561         assert(word);
 562         if ( ! print_encode(h, word, 0)) {
 563                 if ( ! (h->flags & HTML_NONOSPACE))
 564                         h->flags &= ~HTML_NOSPACE;
 565                 h->flags &= ~HTML_NONEWLINE;
 566         } else
 567                 h->flags |= HTML_NOSPACE | HTML_NONEWLINE;
 568
 569         if (h->metaf) {
 570                 print_tagq(h, h->metaf);
 571                 h->metaf = NULL;
 572         }
 573
 574         h->flags &= ~HTML_IGNDELIM;
 575 }
 576
 577 void
 578 print_tagq(struct html *h, const struct tag *until)
 579 {
 580         struct tag      *tag;
 581
 582         while ((tag = h->tags.head) != NULL) {
 583                 /*
 584                  * Remember to close out and nullify the current
 585                  * meta-font and table, if applicable.
 586                  */
 587                 if (tag == h->metaf)
 588                         h->metaf = NULL;
 589                 if (tag == h->tblt)
 590                         h->tblt = NULL;
 591                 print_ctag(h, tag->tag);
 592                 h->tags.head = tag->next;
 593                 free(tag);
 594                 if (until && tag == until)
 595                         return;
 596         }
 597 }
 598
 599 void
 600 print_stagq(struct html *h, const struct tag *suntil)
 601 {
 602         struct tag      *tag;
 603
 604         while ((tag = h->tags.head) != NULL) {
 605                 if (suntil && tag == suntil)
 606                         return;
 607                 /*
 608                  * Remember to close out and nullify the current
 609                  * meta-font and table, if applicable.
 610                  */
 611                 if (tag == h->metaf)
 612                         h->metaf = NULL;
 613                 if (tag == h->tblt)
 614                         h->tblt = NULL;
 615                 print_ctag(h, tag->tag);
 616                 h->tags.head = tag->next;
 617                 free(tag);
 618         }
 619 }
 620
 621 void
 622 print_paragraph(struct html *h)
 623 {
 624         struct tag      *t;
 625         struct htmlpair  tag;
 626
 627         PAIR_CLASS_INIT(&tag, "spacer");
 628         t = print_otag(h, TAG_DIV, 1, &tag);
 629         print_tagq(h, t);
 630 }
 631
 632
 633 void
 634 bufinit(struct html *h)
 635 {
 636
 637         h->buf[0] = '\0';
 638         h->buflen = 0;
 639 }
 640
 641 void
 642 bufcat_style(struct html *h, const char *key, const char *val)
 643 {
 644
 645         bufcat(h, key);
 646         bufcat(h, ":");
 647         bufcat(h, val);
 648         bufcat(h, ";");
 649 }
 650
 651 void
 652 bufcat(struct html *h, const char *p)
 653 {
 654
 655         /*
 656          * XXX This is broken and not easy to fix.
 657          * When using the -Oincludes option, buffmt_includes()
 658          * may pass in strings overrunning BUFSIZ, causing a crash.
 659          */
 660
 661         h->buflen = strlcat(h->buf, p, BUFSIZ);
 662         assert(h->buflen < BUFSIZ);
 663 }
 664
 665 void
 666 bufcat_fmt(struct html *h, const char *fmt, ...)
 667 {
 668         va_list          ap;
 669
 670         va_start(ap, fmt);
 671         (void)vsnprintf(h->buf + (int)h->buflen,
 672             BUFSIZ - h->buflen - 1, fmt, ap);
 673         va_end(ap);
 674         h->buflen = strlen(h->buf);
 675 }
 676
 677 static void
 678 bufncat(struct html *h, const char *p, size_t sz)
 679 {
 680
 681         assert(h->buflen + sz + 1 < BUFSIZ);
 682         strncat(h->buf, p, sz);
 683         h->buflen += sz;
 684 }
 685
 686 void
 687 buffmt_includes(struct html *h, const char *name)
 688 {
 689         const char      *p, *pp;
 690
 691         pp = h->base_includes;
 692
 693         bufinit(h);
 694         while (NULL != (p = strchr(pp, '%'))) {
 695                 bufncat(h, pp, (size_t)(p - pp));
 696                 switch (*(p + 1)) {
 697                 case'I':
 698                         bufcat(h, name);
 699                         break;
 700                 default:
 701                         bufncat(h, p, 2);
 702                         break;
 703                 }
 704                 pp = p + 2;
 705         }
 706         if (pp)
 707                 bufcat(h, pp);
 708 }
 709
 710 void
 711 buffmt_man(struct html *h, const char *name, const char *sec)
 712 {
 713         const char      *p, *pp;
 714
 715         pp = h->base_man;
 716
 717         bufinit(h);
 718         while (NULL != (p = strchr(pp, '%'))) {
 719                 bufncat(h, pp, (size_t)(p - pp));
 720                 switch (*(p + 1)) {
 721                 case 'S':
 722                         bufcat(h, sec ? sec : "1");
 723                         break;
 724                 case 'N':
 725                         bufcat_fmt(h, "%s", name);
 726                         break;
 727                 default:
 728                         bufncat(h, p, 2);
 729                         break;
 730                 }
 731                 pp = p + 2;
 732         }
 733         if (pp)
 734                 bufcat(h, pp);
 735 }
 736
 737 void
 738 bufcat_su(struct html *h, const char *p, const struct roffsu *su)
 739 {
 740         double           v;
 741
 742         v = su->scale;
 743         if (SCALE_MM == su->unit && 0.0 == (v /= 100.0))
 744                 v = 1.0;
 745         else if (SCALE_BU == su->unit)
 746                 v /= 24.0;
 747
 748         bufcat_fmt(h, "%s: %.2f%s;", p, v, roffscales[su->unit]);
 749 }
 750
 751 void
 752 bufcat_id(struct html *h, const char *src)
 753 {
 754
 755         /* Cf. <http://www.w3.org/TR/html4/types.html#h-6.2>. */
 756
 757         while ('\0' != *src)
 758                 bufcat_fmt(h, "%.2x", *src++);
 759 }