html.c

   1 /*      $Id: html.c,v 1.187 2015/09/26 00:54:03 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2011-2015 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 AUTHORS DISCLAIM ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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 "manconf.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         {"pre",         HTML_CLRLINE }, /* TAG_PRE */
  72         {"b",           0 }, /* TAG_B */
  73         {"i",           0 }, /* TAG_I */
  74         {"code",        0 }, /* TAG_CODE */
  75         {"small",       0 }, /* TAG_SMALL */
  76         {"style",       HTML_CLRLINE}, /* TAG_STYLE */
  77         {"math",        HTML_CLRLINE}, /* TAG_MATH */
  78         {"mrow",        0}, /* TAG_MROW */
  79         {"mi",          0}, /* TAG_MI */
  80         {"mo",          0}, /* TAG_MO */
  81         {"msup",        0}, /* TAG_MSUP */
  82         {"msub",        0}, /* TAG_MSUB */
  83         {"msubsup",     0}, /* TAG_MSUBSUP */
  84         {"mfrac",       0}, /* TAG_MFRAC */
  85         {"msqrt",       0}, /* TAG_MSQRT */
  86         {"mfenced",     0}, /* TAG_MFENCED */
  87         {"mtable",      0}, /* TAG_MTABLE */
  88         {"mtr",         0}, /* TAG_MTR */
  89         {"mtd",         0}, /* TAG_MTD */
  90         {"munderover",  0}, /* TAG_MUNDEROVER */
  91         {"munder",      0}, /* TAG_MUNDER*/
  92         {"mover",       0}, /* TAG_MOVER*/
  93 };
  94
  95 static  const char      *const htmlattrs[ATTR_MAX] = {
  96         "name", /* ATTR_NAME */
  97         "rel", /* ATTR_REL */
  98         "href", /* ATTR_HREF */
  99         "type", /* ATTR_TYPE */
 100         "media", /* ATTR_MEDIA */
 101         "class", /* ATTR_CLASS */
 102         "style", /* ATTR_STYLE */
 103         "id", /* ATTR_ID */
 104         "colspan", /* ATTR_COLSPAN */
 105         "charset", /* ATTR_CHARSET */
 106         "open", /* ATTR_OPEN */
 107         "close", /* ATTR_CLOSE */
 108         "mathvariant", /* ATTR_MATHVARIANT */
 109 };
 110
 111 static  const char      *const roffscales[SCALE_MAX] = {
 112         "cm", /* SCALE_CM */
 113         "in", /* SCALE_IN */
 114         "pc", /* SCALE_PC */
 115         "pt", /* SCALE_PT */
 116         "em", /* SCALE_EM */
 117         "em", /* SCALE_MM */
 118         "ex", /* SCALE_EN */
 119         "ex", /* SCALE_BU */
 120         "em", /* SCALE_VS */
 121         "ex", /* SCALE_FS */
 122 };
 123
 124 static  void     bufncat(struct html *, const char *, size_t);
 125 static  void     print_ctag(struct html *, struct tag *);
 126 static  int      print_escape(char);
 127 static  int      print_encode(struct html *, const char *, int);
 128 static  void     print_metaf(struct html *, enum mandoc_esc);
 129 static  void     print_attr(struct html *, const char *, const char *);
 130
 131
 132 void *
 133 html_alloc(const struct mchars *mchars, const struct manoutput *outopts)
 134 {
 135         struct html     *h;
 136
 137         h = mandoc_calloc(1, sizeof(struct html));
 138
 139         h->tags.head = NULL;
 140         h->symtab = mchars;
 141
 142         h->style = outopts->style;
 143         h->base_man = outopts->man;
 144         h->base_includes = outopts->includes;
 145         if (outopts->fragment)
 146                 h->oflags |= HTML_FRAGMENT;
 147
 148         return(h);
 149 }
 150
 151 void
 152 html_free(void *p)
 153 {
 154         struct tag      *tag;
 155         struct html     *h;
 156
 157         h = (struct html *)p;
 158
 159         while ((tag = h->tags.head) != NULL) {
 160                 h->tags.head = tag->next;
 161                 free(tag);
 162         }
 163
 164         free(h);
 165 }
 166
 167 void
 168 print_gen_head(struct html *h)
 169 {
 170         struct htmlpair  tag[4];
 171         struct tag      *t;
 172
 173         tag[0].key = ATTR_CHARSET;
 174         tag[0].val = "utf-8";
 175         print_otag(h, TAG_META, 1, tag);
 176
 177         /*
 178          * Print a default style-sheet.
 179          */
 180         t = print_otag(h, TAG_STYLE, 0, NULL);
 181         print_text(h, "table.head, table.foot { width: 100%; }\n"
 182               "td.head-rtitle, td.foot-os { text-align: right; }\n"
 183               "td.head-vol { text-align: center; }\n"
 184               "table.foot td { width: 50%; }\n"
 185               "table.head td { width: 33%; }\n"
 186               "div.spacer { margin: 1em 0; }\n");
 187         print_tagq(h, t);
 188
 189         if (h->style) {
 190                 tag[0].key = ATTR_REL;
 191                 tag[0].val = "stylesheet";
 192                 tag[1].key = ATTR_HREF;
 193                 tag[1].val = h->style;
 194                 tag[2].key = ATTR_TYPE;
 195                 tag[2].val = "text/css";
 196                 tag[3].key = ATTR_MEDIA;
 197                 tag[3].val = "all";
 198                 print_otag(h, TAG_LINK, 4, tag);
 199         }
 200 }
 201
 202 static void
 203 print_metaf(struct html *h, enum mandoc_esc deco)
 204 {
 205         enum htmlfont    font;
 206
 207         switch (deco) {
 208         case ESCAPE_FONTPREV:
 209                 font = h->metal;
 210                 break;
 211         case ESCAPE_FONTITALIC:
 212                 font = HTMLFONT_ITALIC;
 213                 break;
 214         case ESCAPE_FONTBOLD:
 215                 font = HTMLFONT_BOLD;
 216                 break;
 217         case ESCAPE_FONTBI:
 218                 font = HTMLFONT_BI;
 219                 break;
 220         case ESCAPE_FONT:
 221                 /* FALLTHROUGH */
 222         case ESCAPE_FONTROMAN:
 223                 font = HTMLFONT_NONE;
 224                 break;
 225         default:
 226                 abort();
 227         }
 228
 229         if (h->metaf) {
 230                 print_tagq(h, h->metaf);
 231                 h->metaf = NULL;
 232         }
 233
 234         h->metal = h->metac;
 235         h->metac = font;
 236
 237         switch (font) {
 238         case HTMLFONT_ITALIC:
 239                 h->metaf = print_otag(h, TAG_I, 0, NULL);
 240                 break;
 241         case HTMLFONT_BOLD:
 242                 h->metaf = print_otag(h, TAG_B, 0, NULL);
 243                 break;
 244         case HTMLFONT_BI:
 245                 h->metaf = print_otag(h, TAG_B, 0, NULL);
 246                 print_otag(h, TAG_I, 0, NULL);
 247                 break;
 248         default:
 249                 break;
 250         }
 251 }
 252
 253 int
 254 html_strlen(const char *cp)
 255 {
 256         size_t           rsz;
 257         int              skip, sz;
 258
 259         /*
 260          * Account for escaped sequences within string length
 261          * calculations.  This follows the logic in term_strlen() as we
 262          * must calculate the width of produced strings.
 263          * Assume that characters are always width of "1".  This is
 264          * hacky, but it gets the job done for approximation of widths.
 265          */
 266
 267         sz = 0;
 268         skip = 0;
 269         while (1) {
 270                 rsz = strcspn(cp, "\\");
 271                 if (rsz) {
 272                         cp += rsz;
 273                         if (skip) {
 274                                 skip = 0;
 275                                 rsz--;
 276                         }
 277                         sz += rsz;
 278                 }
 279                 if ('\0' == *cp)
 280                         break;
 281                 cp++;
 282                 switch (mandoc_escape(&cp, NULL, NULL)) {
 283                 case ESCAPE_ERROR:
 284                         return(sz);
 285                 case ESCAPE_UNICODE:
 286                         /* FALLTHROUGH */
 287                 case ESCAPE_NUMBERED:
 288                         /* FALLTHROUGH */
 289                 case ESCAPE_SPECIAL:
 290                         /* FALLTHROUGH */
 291                 case ESCAPE_OVERSTRIKE:
 292                         if (skip)
 293                                 skip = 0;
 294                         else
 295                                 sz++;
 296                         break;
 297                 case ESCAPE_SKIPCHAR:
 298                         skip = 1;
 299                         break;
 300                 default:
 301                         break;
 302                 }
 303         }
 304         return(sz);
 305 }
 306
 307 static int
 308 print_escape(char c)
 309 {
 310
 311         switch (c) {
 312         case '<':
 313                 printf("&lt;");
 314                 break;
 315         case '>':
 316                 printf("&gt;");
 317                 break;
 318         case '&':
 319                 printf("&amp;");
 320                 break;
 321         case '"':
 322                 printf("&quot;");
 323                 break;
 324         case ASCII_NBRSP:
 325                 putchar('-');
 326                 break;
 327         case ASCII_HYPH:
 328                 putchar('-');
 329                 /* FALLTHROUGH */
 330         case ASCII_BREAK:
 331                 break;
 332         default:
 333                 return(0);
 334         }
 335         return(1);
 336 }
 337
 338 static int
 339 print_encode(struct html *h, const char *p, int norecurse)
 340 {
 341         size_t           sz;
 342         int              c, len, nospace;
 343         const char      *seq;
 344         enum mandoc_esc  esc;
 345         static const char rejs[9] = { '\\', '<', '>', '&', '"',
 346                 ASCII_NBRSP, ASCII_HYPH, ASCII_BREAK, '\0' };
 347
 348         nospace = 0;
 349
 350         while ('\0' != *p) {
 351                 if (HTML_SKIPCHAR & h->flags && '\\' != *p) {
 352                         h->flags &= ~HTML_SKIPCHAR;
 353                         p++;
 354                         continue;
 355                 }
 356
 357                 sz = strcspn(p, rejs);
 358
 359                 fwrite(p, 1, sz, stdout);
 360                 p += (int)sz;
 361
 362                 if ('\0' == *p)
 363                         break;
 364
 365                 if (print_escape(*p++))
 366                         continue;
 367
 368                 esc = mandoc_escape(&p, &seq, &len);
 369                 if (ESCAPE_ERROR == esc)
 370                         break;
 371
 372                 switch (esc) {
 373                 case ESCAPE_FONT:
 374                         /* FALLTHROUGH */
 375                 case ESCAPE_FONTPREV:
 376                         /* FALLTHROUGH */
 377                 case ESCAPE_FONTBOLD:
 378                         /* FALLTHROUGH */
 379                 case ESCAPE_FONTITALIC:
 380                         /* FALLTHROUGH */
 381                 case ESCAPE_FONTBI:
 382                         /* FALLTHROUGH */
 383                 case ESCAPE_FONTROMAN:
 384                         if (0 == norecurse)
 385                                 print_metaf(h, esc);
 386                         continue;
 387                 case ESCAPE_SKIPCHAR:
 388                         h->flags |= HTML_SKIPCHAR;
 389                         continue;
 390                 default:
 391                         break;
 392                 }
 393
 394                 if (h->flags & HTML_SKIPCHAR) {
 395                         h->flags &= ~HTML_SKIPCHAR;
 396                         continue;
 397                 }
 398
 399                 switch (esc) {
 400                 case ESCAPE_UNICODE:
 401                         /* Skip past "u" header. */
 402                         c = mchars_num2uc(seq + 1, len - 1);
 403                         break;
 404                 case ESCAPE_NUMBERED:
 405                         c = mchars_num2char(seq, len);
 406                         if (c < 0)
 407                                 continue;
 408                         break;
 409                 case ESCAPE_SPECIAL:
 410                         c = mchars_spec2cp(h->symtab, seq, len);
 411                         if (c <= 0)
 412                                 continue;
 413                         break;
 414                 case ESCAPE_NOSPACE:
 415                         if ('\0' == *p)
 416                                 nospace = 1;
 417                         continue;
 418                 case ESCAPE_OVERSTRIKE:
 419                         if (len == 0)
 420                                 continue;
 421                         c = seq[len - 1];
 422                         break;
 423                 default:
 424                         continue;
 425                 }
 426                 if ((c < 0x20 && c != 0x09) ||
 427                     (c > 0x7E && c < 0xA0))
 428                         c = 0xFFFD;
 429                 if (c > 0x7E)
 430                         printf("&#%d;", c);
 431                 else if ( ! print_escape(c))
 432                         putchar(c);
 433         }
 434
 435         return(nospace);
 436 }
 437
 438 static void
 439 print_attr(struct html *h, const char *key, const char *val)
 440 {
 441         printf(" %s=\"", key);
 442         (void)print_encode(h, val, 1);
 443         putchar('\"');
 444 }
 445
 446 struct tag *
 447 print_otag(struct html *h, enum htmltag tag,
 448                 int sz, const struct htmlpair *p)
 449 {
 450         int              i;
 451         struct tag      *t;
 452
 453         /* Push this tags onto the stack of open scopes. */
 454
 455         if ( ! (HTML_NOSTACK & htmltags[tag].flags)) {
 456                 t = mandoc_malloc(sizeof(struct tag));
 457                 t->tag = tag;
 458                 t->next = h->tags.head;
 459                 h->tags.head = t;
 460         } else
 461                 t = NULL;
 462
 463         if ( ! (HTML_NOSPACE & h->flags))
 464                 if ( ! (HTML_CLRLINE & htmltags[tag].flags)) {
 465                         /* Manage keeps! */
 466                         if ( ! (HTML_KEEP & h->flags)) {
 467                                 if (HTML_PREKEEP & h->flags)
 468                                         h->flags |= HTML_KEEP;
 469                                 putchar(' ');
 470                         } else
 471                                 printf("&#160;");
 472                 }
 473
 474         if ( ! (h->flags & HTML_NONOSPACE))
 475                 h->flags &= ~HTML_NOSPACE;
 476         else
 477                 h->flags |= HTML_NOSPACE;
 478
 479         /* Print out the tag name and attributes. */
 480
 481         printf("<%s", htmltags[tag].name);
 482         for (i = 0; i < sz; i++)
 483                 print_attr(h, htmlattrs[p[i].key], p[i].val);
 484
 485         /* Accommodate for "well-formed" singleton escaping. */
 486
 487         if (HTML_AUTOCLOSE & htmltags[tag].flags)
 488                 putchar('/');
 489
 490         putchar('>');
 491
 492         h->flags |= HTML_NOSPACE;
 493
 494         if ((HTML_AUTOCLOSE | HTML_CLRLINE) & htmltags[tag].flags)
 495                 putchar('\n');
 496
 497         return(t);
 498 }
 499
 500 static void
 501 print_ctag(struct html *h, struct tag *tag)
 502 {
 503
 504         /*
 505          * Remember to close out and nullify the current
 506          * meta-font and table, if applicable.
 507          */
 508         if (tag == h->metaf)
 509                 h->metaf = NULL;
 510         if (tag == h->tblt)
 511                 h->tblt = NULL;
 512
 513         printf("</%s>", htmltags[tag->tag].name);
 514         if (HTML_CLRLINE & htmltags[tag->tag].flags) {
 515                 h->flags |= HTML_NOSPACE;
 516                 putchar('\n');
 517         }
 518
 519         h->tags.head = tag->next;
 520         free(tag);
 521 }
 522
 523 void
 524 print_gen_decls(struct html *h)
 525 {
 526
 527         puts("<!DOCTYPE html>");
 528 }
 529
 530 void
 531 print_text(struct html *h, const char *word)
 532 {
 533
 534         if ( ! (HTML_NOSPACE & h->flags)) {
 535                 /* Manage keeps! */
 536                 if ( ! (HTML_KEEP & h->flags)) {
 537                         if (HTML_PREKEEP & h->flags)
 538                                 h->flags |= HTML_KEEP;
 539                         putchar(' ');
 540                 } else
 541                         printf("&#160;");
 542         }
 543
 544         assert(NULL == h->metaf);
 545         switch (h->metac) {
 546         case HTMLFONT_ITALIC:
 547                 h->metaf = print_otag(h, TAG_I, 0, NULL);
 548                 break;
 549         case HTMLFONT_BOLD:
 550                 h->metaf = print_otag(h, TAG_B, 0, NULL);
 551                 break;
 552         case HTMLFONT_BI:
 553                 h->metaf = print_otag(h, TAG_B, 0, NULL);
 554                 print_otag(h, TAG_I, 0, NULL);
 555                 break;
 556         default:
 557                 break;
 558         }
 559
 560         assert(word);
 561         if ( ! print_encode(h, word, 0)) {
 562                 if ( ! (h->flags & HTML_NONOSPACE))
 563                         h->flags &= ~HTML_NOSPACE;
 564                 h->flags &= ~HTML_NONEWLINE;
 565         } else
 566                 h->flags |= HTML_NOSPACE | HTML_NONEWLINE;
 567
 568         if (h->metaf) {
 569                 print_tagq(h, h->metaf);
 570                 h->metaf = NULL;
 571         }
 572
 573         h->flags &= ~HTML_IGNDELIM;
 574 }
 575
 576 void
 577 print_tagq(struct html *h, const struct tag *until)
 578 {
 579         struct tag      *tag;
 580
 581         while ((tag = h->tags.head) != NULL) {
 582                 print_ctag(h, tag);
 583                 if (until && tag == until)
 584                         return;
 585         }
 586 }
 587
 588 void
 589 print_stagq(struct html *h, const struct tag *suntil)
 590 {
 591         struct tag      *tag;
 592
 593         while ((tag = h->tags.head) != NULL) {
 594                 if (suntil && tag == suntil)
 595                         return;
 596                 print_ctag(h, tag);
 597         }
 598 }
 599
 600 void
 601 print_paragraph(struct html *h)
 602 {
 603         struct tag      *t;
 604         struct htmlpair  tag;
 605
 606         PAIR_CLASS_INIT(&tag, "spacer");
 607         t = print_otag(h, TAG_DIV, 1, &tag);
 608         print_tagq(h, t);
 609 }
 610
 611
 612 void
 613 bufinit(struct html *h)
 614 {
 615
 616         h->buf[0] = '\0';
 617         h->buflen = 0;
 618 }
 619
 620 void
 621 bufcat_style(struct html *h, const char *key, const char *val)
 622 {
 623
 624         bufcat(h, key);
 625         bufcat(h, ":");
 626         bufcat(h, val);
 627         bufcat(h, ";");
 628 }
 629
 630 void
 631 bufcat(struct html *h, const char *p)
 632 {
 633
 634         /*
 635          * XXX This is broken and not easy to fix.
 636          * When using the -Oincludes option, buffmt_includes()
 637          * may pass in strings overrunning BUFSIZ, causing a crash.
 638          */
 639
 640         h->buflen = strlcat(h->buf, p, BUFSIZ);
 641         assert(h->buflen < BUFSIZ);
 642 }
 643
 644 void
 645 bufcat_fmt(struct html *h, const char *fmt, ...)
 646 {
 647         va_list          ap;
 648
 649         va_start(ap, fmt);
 650         (void)vsnprintf(h->buf + (int)h->buflen,
 651             BUFSIZ - h->buflen - 1, fmt, ap);
 652         va_end(ap);
 653         h->buflen = strlen(h->buf);
 654 }
 655
 656 static void
 657 bufncat(struct html *h, const char *p, size_t sz)
 658 {
 659
 660         assert(h->buflen + sz + 1 < BUFSIZ);
 661         strncat(h->buf, p, sz);
 662         h->buflen += sz;
 663 }
 664
 665 void
 666 buffmt_includes(struct html *h, const char *name)
 667 {
 668         const char      *p, *pp;
 669
 670         pp = h->base_includes;
 671
 672         bufinit(h);
 673         while (NULL != (p = strchr(pp, '%'))) {
 674                 bufncat(h, pp, (size_t)(p - pp));
 675                 switch (*(p + 1)) {
 676                 case'I':
 677                         bufcat(h, name);
 678                         break;
 679                 default:
 680                         bufncat(h, p, 2);
 681                         break;
 682                 }
 683                 pp = p + 2;
 684         }
 685         if (pp)
 686                 bufcat(h, pp);
 687 }
 688
 689 void
 690 buffmt_man(struct html *h, const char *name, const char *sec)
 691 {
 692         const char      *p, *pp;
 693
 694         pp = h->base_man;
 695
 696         bufinit(h);
 697         while (NULL != (p = strchr(pp, '%'))) {
 698                 bufncat(h, pp, (size_t)(p - pp));
 699                 switch (*(p + 1)) {
 700                 case 'S':
 701                         bufcat(h, sec ? sec : "1");
 702                         break;
 703                 case 'N':
 704                         bufcat_fmt(h, "%s", name);
 705                         break;
 706                 default:
 707                         bufncat(h, p, 2);
 708                         break;
 709                 }
 710                 pp = p + 2;
 711         }
 712         if (pp)
 713                 bufcat(h, pp);
 714 }
 715
 716 void
 717 bufcat_su(struct html *h, const char *p, const struct roffsu *su)
 718 {
 719         double           v;
 720
 721         v = su->scale;
 722         if (SCALE_MM == su->unit && 0.0 == (v /= 100.0))
 723                 v = 1.0;
 724         else if (SCALE_BU == su->unit)
 725                 v /= 24.0;
 726
 727         bufcat_fmt(h, "%s: %.2f%s;", p, v, roffscales[su->unit]);
 728 }
 729
 730 void
 731 bufcat_id(struct html *h, const char *src)
 732 {
 733
 734         /* Cf. <http://www.w3.org/TR/html4/types.html#h-6.2>. */
 735
 736         while ('\0' != *src)
 737                 bufcat_fmt(h, "%.2x", *src++);
 738 }