contrib/mdocml/html.c

   1 /*      $Id: html.c,v 1.159 2014/07/23 15:00:08 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 #ifdef HAVE_CONFIG_H
  19 #include "config.h"
  20 #endif
  21
  22 #include <sys/types.h>
  23
  24 #include <assert.h>
  25 #include <ctype.h>
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <stdint.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32
  33 #include "mandoc.h"
  34 #include "mandoc_aux.h"
  35 #include "libmandoc.h"
  36 #include "out.h"
  37 #include "html.h"
  38 #include "main.h"
  39
  40 struct  htmldata {
  41         const char       *name;
  42         int               flags;
  43 #define HTML_CLRLINE     (1 << 0)
  44 #define HTML_NOSTACK     (1 << 1)
  45 #define HTML_AUTOCLOSE   (1 << 2) /* Tag has auto-closure. */
  46 };
  47
  48 static  const struct htmldata htmltags[TAG_MAX] = {
  49         {"html",        HTML_CLRLINE}, /* TAG_HTML */
  50         {"head",        HTML_CLRLINE}, /* TAG_HEAD */
  51         {"body",        HTML_CLRLINE}, /* TAG_BODY */
  52         {"meta",        HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_META */
  53         {"title",       HTML_CLRLINE}, /* TAG_TITLE */
  54         {"div",         HTML_CLRLINE}, /* TAG_DIV */
  55         {"h1",          0}, /* TAG_H1 */
  56         {"h2",          0}, /* TAG_H2 */
  57         {"span",        0}, /* TAG_SPAN */
  58         {"link",        HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_LINK */
  59         {"br",          HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_BR */
  60         {"a",           0}, /* TAG_A */
  61         {"table",       HTML_CLRLINE}, /* TAG_TABLE */
  62         {"tbody",       HTML_CLRLINE}, /* TAG_TBODY */
  63         {"col",         HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_COL */
  64         {"tr",          HTML_CLRLINE}, /* TAG_TR */
  65         {"td",          HTML_CLRLINE}, /* TAG_TD */
  66         {"li",          HTML_CLRLINE}, /* TAG_LI */
  67         {"ul",          HTML_CLRLINE}, /* TAG_UL */
  68         {"ol",          HTML_CLRLINE}, /* TAG_OL */
  69         {"dl",          HTML_CLRLINE}, /* TAG_DL */
  70         {"dt",          HTML_CLRLINE}, /* TAG_DT */
  71         {"dd",          HTML_CLRLINE}, /* TAG_DD */
  72         {"blockquote",  HTML_CLRLINE}, /* TAG_BLOCKQUOTE */
  73         {"p",           HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_P */
  74         {"pre",         HTML_CLRLINE }, /* TAG_PRE */
  75         {"b",           0 }, /* TAG_B */
  76         {"i",           0 }, /* TAG_I */
  77         {"code",        0 }, /* TAG_CODE */
  78         {"small",       0 }, /* TAG_SMALL */
  79 };
  80
  81 static  const char      *const htmlattrs[ATTR_MAX] = {
  82         "http-equiv", /* ATTR_HTTPEQUIV */
  83         "content", /* ATTR_CONTENT */
  84         "name", /* ATTR_NAME */
  85         "rel", /* ATTR_REL */
  86         "href", /* ATTR_HREF */
  87         "type", /* ATTR_TYPE */
  88         "media", /* ATTR_MEDIA */
  89         "class", /* ATTR_CLASS */
  90         "style", /* ATTR_STYLE */
  91         "width", /* ATTR_WIDTH */
  92         "id", /* ATTR_ID */
  93         "summary", /* ATTR_SUMMARY */
  94         "align", /* ATTR_ALIGN */
  95         "colspan", /* ATTR_COLSPAN */
  96 };
  97
  98 static  const char      *const roffscales[SCALE_MAX] = {
  99         "cm", /* SCALE_CM */
 100         "in", /* SCALE_IN */
 101         "pc", /* SCALE_PC */
 102         "pt", /* SCALE_PT */
 103         "em", /* SCALE_EM */
 104         "em", /* SCALE_MM */
 105         "ex", /* SCALE_EN */
 106         "ex", /* SCALE_BU */
 107         "em", /* SCALE_VS */
 108         "ex", /* SCALE_FS */
 109 };
 110
 111 static  void     bufncat(struct html *, const char *, size_t);
 112 static  void     print_ctag(struct html *, enum htmltag);
 113 static  int      print_escape(char);
 114 static  int      print_encode(struct html *, const char *, int);
 115 static  void     print_metaf(struct html *, enum mandoc_esc);
 116 static  void     print_attr(struct html *, const char *, const char *);
 117 static  void     *ml_alloc(char *, enum htmltype);
 118
 119
 120 static void *
 121 ml_alloc(char *outopts, enum htmltype type)
 122 {
 123         struct html     *h;
 124         const char      *toks[5];
 125         char            *v;
 126
 127         toks[0] = "style";
 128         toks[1] = "man";
 129         toks[2] = "includes";
 130         toks[3] = "fragment";
 131         toks[4] = NULL;
 132
 133         h = mandoc_calloc(1, sizeof(struct html));
 134
 135         h->type = type;
 136         h->tags.head = NULL;
 137         h->symtab = mchars_alloc();
 138
 139         while (outopts && *outopts)
 140                 switch (getsubopt(&outopts, UNCONST(toks), &v)) {
 141                 case 0:
 142                         h->style = v;
 143                         break;
 144                 case 1:
 145                         h->base_man = v;
 146                         break;
 147                 case 2:
 148                         h->base_includes = v;
 149                         break;
 150                 case 3:
 151                         h->oflags |= HTML_FRAGMENT;
 152                         break;
 153                 default:
 154                         break;
 155                 }
 156
 157         return(h);
 158 }
 159
 160 void *
 161 html_alloc(char *outopts)
 162 {
 163
 164         return(ml_alloc(outopts, HTML_HTML_4_01_STRICT));
 165 }
 166
 167 void *
 168 xhtml_alloc(char *outopts)
 169 {
 170
 171         return(ml_alloc(outopts, HTML_XHTML_1_0_STRICT));
 172 }
 173
 174 void
 175 html_free(void *p)
 176 {
 177         struct tag      *tag;
 178         struct html     *h;
 179
 180         h = (struct html *)p;
 181
 182         while ((tag = h->tags.head) != NULL) {
 183                 h->tags.head = tag->next;
 184                 free(tag);
 185         }
 186
 187         if (h->symtab)
 188                 mchars_free(h->symtab);
 189
 190         free(h);
 191 }
 192
 193 void
 194 print_gen_head(struct html *h)
 195 {
 196         struct htmlpair  tag[4];
 197
 198         tag[0].key = ATTR_HTTPEQUIV;
 199         tag[0].val = "Content-Type";
 200         tag[1].key = ATTR_CONTENT;
 201         tag[1].val = "text/html; charset=utf-8";
 202         print_otag(h, TAG_META, 2, tag);
 203
 204         tag[0].key = ATTR_NAME;
 205         tag[0].val = "resource-type";
 206         tag[1].key = ATTR_CONTENT;
 207         tag[1].val = "document";
 208         print_otag(h, TAG_META, 2, tag);
 209
 210         if (h->style) {
 211                 tag[0].key = ATTR_REL;
 212                 tag[0].val = "stylesheet";
 213                 tag[1].key = ATTR_HREF;
 214                 tag[1].val = h->style;
 215                 tag[2].key = ATTR_TYPE;
 216                 tag[2].val = "text/css";
 217                 tag[3].key = ATTR_MEDIA;
 218                 tag[3].val = "all";
 219                 print_otag(h, TAG_LINK, 4, tag);
 220         }
 221 }
 222
 223 static void
 224 print_metaf(struct html *h, enum mandoc_esc deco)
 225 {
 226         enum htmlfont    font;
 227
 228         switch (deco) {
 229         case ESCAPE_FONTPREV:
 230                 font = h->metal;
 231                 break;
 232         case ESCAPE_FONTITALIC:
 233                 font = HTMLFONT_ITALIC;
 234                 break;
 235         case ESCAPE_FONTBOLD:
 236                 font = HTMLFONT_BOLD;
 237                 break;
 238         case ESCAPE_FONTBI:
 239                 font = HTMLFONT_BI;
 240                 break;
 241         case ESCAPE_FONT:
 242                 /* FALLTHROUGH */
 243         case ESCAPE_FONTROMAN:
 244                 font = HTMLFONT_NONE;
 245                 break;
 246         default:
 247                 abort();
 248                 /* NOTREACHED */
 249         }
 250
 251         if (h->metaf) {
 252                 print_tagq(h, h->metaf);
 253                 h->metaf = NULL;
 254         }
 255
 256         h->metal = h->metac;
 257         h->metac = font;
 258
 259         switch (font) {
 260         case HTMLFONT_ITALIC:
 261                 h->metaf = print_otag(h, TAG_I, 0, NULL);
 262                 break;
 263         case HTMLFONT_BOLD:
 264                 h->metaf = print_otag(h, TAG_B, 0, NULL);
 265                 break;
 266         case HTMLFONT_BI:
 267                 h->metaf = print_otag(h, TAG_B, 0, NULL);
 268                 print_otag(h, TAG_I, 0, NULL);
 269                 break;
 270         default:
 271                 break;
 272         }
 273 }
 274
 275 int
 276 html_strlen(const char *cp)
 277 {
 278         size_t           rsz;
 279         int              skip, sz;
 280
 281         /*
 282          * Account for escaped sequences within string length
 283          * calculations.  This follows the logic in term_strlen() as we
 284          * must calculate the width of produced strings.
 285          * Assume that characters are always width of "1".  This is
 286          * hacky, but it gets the job done for approximation of widths.
 287          */
 288
 289         sz = 0;
 290         skip = 0;
 291         while (1) {
 292                 rsz = strcspn(cp, "\\");
 293                 if (rsz) {
 294                         cp += rsz;
 295                         if (skip) {
 296                                 skip = 0;
 297                                 rsz--;
 298                         }
 299                         sz += rsz;
 300                 }
 301                 if ('\0' == *cp)
 302                         break;
 303                 cp++;
 304                 switch (mandoc_escape(&cp, NULL, NULL)) {
 305                 case ESCAPE_ERROR:
 306                         return(sz);
 307                 case ESCAPE_UNICODE:
 308                         /* FALLTHROUGH */
 309                 case ESCAPE_NUMBERED:
 310                         /* FALLTHROUGH */
 311                 case ESCAPE_SPECIAL:
 312                         if (skip)
 313                                 skip = 0;
 314                         else
 315                                 sz++;
 316                         break;
 317                 case ESCAPE_SKIPCHAR:
 318                         skip = 1;
 319                         break;
 320                 default:
 321                         break;
 322                 }
 323         }
 324         return(sz);
 325 }
 326
 327 static int
 328 print_escape(char c)
 329 {
 330
 331         switch (c) {
 332         case '<':
 333                 printf("&lt;");
 334                 break;
 335         case '>':
 336                 printf("&gt;");
 337                 break;
 338         case '&':
 339                 printf("&amp;");
 340                 break;
 341         case '"':
 342                 printf("&quot;");
 343                 break;
 344         case ASCII_NBRSP:
 345                 putchar('-');
 346                 break;
 347         case ASCII_HYPH:
 348                 putchar('-');
 349                 /* FALLTHROUGH */
 350         case ASCII_BREAK:
 351                 break;
 352         default:
 353                 return(0);
 354         }
 355         return(1);
 356 }
 357
 358 static int
 359 print_encode(struct html *h, const char *p, int norecurse)
 360 {
 361         size_t           sz;
 362         int              c, len, nospace;
 363         const char      *seq;
 364         enum mandoc_esc  esc;
 365         static const char rejs[9] = { '\\', '<', '>', '&', '"',
 366                 ASCII_NBRSP, ASCII_HYPH, ASCII_BREAK, '\0' };
 367
 368         nospace = 0;
 369
 370         while ('\0' != *p) {
 371                 if (HTML_SKIPCHAR & h->flags && '\\' != *p) {
 372                         h->flags &= ~HTML_SKIPCHAR;
 373                         p++;
 374                         continue;
 375                 }
 376
 377                 sz = strcspn(p, rejs);
 378
 379                 fwrite(p, 1, sz, stdout);
 380                 p += (int)sz;
 381
 382                 if ('\0' == *p)
 383                         break;
 384
 385                 if (print_escape(*p++))
 386                         continue;
 387
 388                 esc = mandoc_escape(&p, &seq, &len);
 389                 if (ESCAPE_ERROR == esc)
 390                         break;
 391
 392                 switch (esc) {
 393                 case ESCAPE_FONT:
 394                         /* FALLTHROUGH */
 395                 case ESCAPE_FONTPREV:
 396                         /* FALLTHROUGH */
 397                 case ESCAPE_FONTBOLD:
 398                         /* FALLTHROUGH */
 399                 case ESCAPE_FONTITALIC:
 400                         /* FALLTHROUGH */
 401                 case ESCAPE_FONTBI:
 402                         /* FALLTHROUGH */
 403                 case ESCAPE_FONTROMAN:
 404                         if (0 == norecurse)
 405                                 print_metaf(h, esc);
 406                         continue;
 407                 case ESCAPE_SKIPCHAR:
 408                         h->flags |= HTML_SKIPCHAR;
 409                         continue;
 410                 default:
 411                         break;
 412                 }
 413
 414                 if (h->flags & HTML_SKIPCHAR) {
 415                         h->flags &= ~HTML_SKIPCHAR;
 416                         continue;
 417                 }
 418
 419                 switch (esc) {
 420                 case ESCAPE_UNICODE:
 421                         /* Skip past "u" header. */
 422                         c = mchars_num2uc(seq + 1, len - 1);
 423                         if ('\0' != c)
 424                                 printf("&#x%x;", c);
 425                         break;
 426                 case ESCAPE_NUMBERED:
 427                         c = mchars_num2char(seq, len);
 428                         if ( ! ('\0' == c || print_escape(c)))
 429                                 putchar(c);
 430                         break;
 431                 case ESCAPE_SPECIAL:
 432                         c = mchars_spec2cp(h->symtab, seq, len);
 433                         if (c > 0)
 434                                 printf("&#%d;", c);
 435                         else if (-1 == c && 1 == len &&
 436                             !print_escape(*seq))
 437                                 putchar((int)*seq);
 438                         break;
 439                 case ESCAPE_NOSPACE:
 440                         if ('\0' == *p)
 441                                 nospace = 1;
 442                         break;
 443                 default:
 444                         break;
 445                 }
 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         /* Add non-overridable attributes. */
 499
 500         if (TAG_HTML == tag && HTML_XHTML_1_0_STRICT == h->type) {
 501                 print_attr(h, "xmlns", "http://www.w3.org/1999/xhtml");
 502                 print_attr(h, "xml:lang", "en");
 503                 print_attr(h, "lang", "en");
 504         }
 505
 506         /* Accommodate for XML "well-formed" singleton escaping. */
 507
 508         if (HTML_AUTOCLOSE & htmltags[tag].flags)
 509                 switch (h->type) {
 510                 case HTML_XHTML_1_0_STRICT:
 511                         putchar('/');
 512                         break;
 513                 default:
 514                         break;
 515                 }
 516
 517         putchar('>');
 518
 519         h->flags |= HTML_NOSPACE;
 520
 521         if ((HTML_AUTOCLOSE | HTML_CLRLINE) & htmltags[tag].flags)
 522                 putchar('\n');
 523
 524         return(t);
 525 }
 526
 527 static void
 528 print_ctag(struct html *h, enum htmltag tag)
 529 {
 530
 531         printf("</%s>", htmltags[tag].name);
 532         if (HTML_CLRLINE & htmltags[tag].flags) {
 533                 h->flags |= HTML_NOSPACE;
 534                 putchar('\n');
 535         }
 536 }
 537
 538 void
 539 print_gen_decls(struct html *h)
 540 {
 541         const char      *doctype;
 542         const char      *dtd;
 543         const char      *name;
 544
 545         switch (h->type) {
 546         case HTML_HTML_4_01_STRICT:
 547                 name = "HTML";
 548                 doctype = "-//W3C//DTD HTML 4.01//EN";
 549                 dtd = "http://www.w3.org/TR/html4/strict.dtd";
 550                 break;
 551         default:
 552                 puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
 553                 name = "html";
 554                 doctype = "-//W3C//DTD XHTML 1.0 Strict//EN";
 555                 dtd = "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";
 556                 break;
 557         }
 558
 559         printf("<!DOCTYPE %s PUBLIC \"%s\" \"%s\">\n",
 560             name, doctype, dtd);
 561 }
 562
 563 void
 564 print_text(struct html *h, const char *word)
 565 {
 566
 567         if ( ! (HTML_NOSPACE & h->flags)) {
 568                 /* Manage keeps! */
 569                 if ( ! (HTML_KEEP & h->flags)) {
 570                         if (HTML_PREKEEP & h->flags)
 571                                 h->flags |= HTML_KEEP;
 572                         putchar(' ');
 573                 } else
 574                         printf("&#160;");
 575         }
 576
 577         assert(NULL == h->metaf);
 578         switch (h->metac) {
 579         case HTMLFONT_ITALIC:
 580                 h->metaf = print_otag(h, TAG_I, 0, NULL);
 581                 break;
 582         case HTMLFONT_BOLD:
 583                 h->metaf = print_otag(h, TAG_B, 0, NULL);
 584                 break;
 585         case HTMLFONT_BI:
 586                 h->metaf = print_otag(h, TAG_B, 0, NULL);
 587                 print_otag(h, TAG_I, 0, NULL);
 588                 break;
 589         default:
 590                 break;
 591         }
 592
 593         assert(word);
 594         if ( ! print_encode(h, word, 0)) {
 595                 if ( ! (h->flags & HTML_NONOSPACE))
 596                         h->flags &= ~HTML_NOSPACE;
 597         } else
 598                 h->flags |= HTML_NOSPACE;
 599
 600         if (h->metaf) {
 601                 print_tagq(h, h->metaf);
 602                 h->metaf = NULL;
 603         }
 604
 605         h->flags &= ~HTML_IGNDELIM;
 606 }
 607
 608 void
 609 print_tagq(struct html *h, const struct tag *until)
 610 {
 611         struct tag      *tag;
 612
 613         while ((tag = h->tags.head) != NULL) {
 614                 /*
 615                  * Remember to close out and nullify the current
 616                  * meta-font and table, if applicable.
 617                  */
 618                 if (tag == h->metaf)
 619                         h->metaf = NULL;
 620                 if (tag == h->tblt)
 621                         h->tblt = NULL;
 622                 print_ctag(h, tag->tag);
 623                 h->tags.head = tag->next;
 624                 free(tag);
 625                 if (until && tag == until)
 626                         return;
 627         }
 628 }
 629
 630 void
 631 print_stagq(struct html *h, const struct tag *suntil)
 632 {
 633         struct tag      *tag;
 634
 635         while ((tag = h->tags.head) != NULL) {
 636                 if (suntil && tag == suntil)
 637                         return;
 638                 /*
 639                  * Remember to close out and nullify the current
 640                  * meta-font and table, if applicable.
 641                  */
 642                 if (tag == h->metaf)
 643                         h->metaf = NULL;
 644                 if (tag == h->tblt)
 645                         h->tblt = NULL;
 646                 print_ctag(h, tag->tag);
 647                 h->tags.head = tag->next;
 648                 free(tag);
 649         }
 650 }
 651
 652 void
 653 bufinit(struct html *h)
 654 {
 655
 656         h->buf[0] = '\0';
 657         h->buflen = 0;
 658 }
 659
 660 void
 661 bufcat_style(struct html *h, const char *key, const char *val)
 662 {
 663
 664         bufcat(h, key);
 665         bufcat(h, ":");
 666         bufcat(h, val);
 667         bufcat(h, ";");
 668 }
 669
 670 void
 671 bufcat(struct html *h, const char *p)
 672 {
 673
 674         /*
 675          * XXX This is broken and not easy to fix.
 676          * When using the -Oincludes option, buffmt_includes()
 677          * may pass in strings overrunning BUFSIZ, causing a crash.
 678          */
 679
 680         h->buflen = strlcat(h->buf, p, BUFSIZ);
 681         assert(h->buflen < BUFSIZ);
 682 }
 683
 684 void
 685 bufcat_fmt(struct html *h, const char *fmt, ...)
 686 {
 687         va_list          ap;
 688
 689         va_start(ap, fmt);
 690         (void)vsnprintf(h->buf + (int)h->buflen,
 691             BUFSIZ - h->buflen - 1, fmt, ap);
 692         va_end(ap);
 693         h->buflen = strlen(h->buf);
 694 }
 695
 696 static void
 697 bufncat(struct html *h, const char *p, size_t sz)
 698 {
 699
 700         assert(h->buflen + sz + 1 < BUFSIZ);
 701         strncat(h->buf, p, sz);
 702         h->buflen += sz;
 703 }
 704
 705 void
 706 buffmt_includes(struct html *h, const char *name)
 707 {
 708         const char      *p, *pp;
 709
 710         pp = h->base_includes;
 711
 712         bufinit(h);
 713         while (NULL != (p = strchr(pp, '%'))) {
 714                 bufncat(h, pp, (size_t)(p - pp));
 715                 switch (*(p + 1)) {
 716                 case'I':
 717                         bufcat(h, 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 buffmt_man(struct html *h, const char *name, const char *sec)
 731 {
 732         const char      *p, *pp;
 733
 734         pp = h->base_man;
 735
 736         bufinit(h);
 737         while (NULL != (p = strchr(pp, '%'))) {
 738                 bufncat(h, pp, (size_t)(p - pp));
 739                 switch (*(p + 1)) {
 740                 case 'S':
 741                         bufcat(h, sec ? sec : "1");
 742                         break;
 743                 case 'N':
 744                         bufcat_fmt(h, "%s", name);
 745                         break;
 746                 default:
 747                         bufncat(h, p, 2);
 748                         break;
 749                 }
 750                 pp = p + 2;
 751         }
 752         if (pp)
 753                 bufcat(h, pp);
 754 }
 755
 756 void
 757 bufcat_su(struct html *h, const char *p, const struct roffsu *su)
 758 {
 759         double           v;
 760
 761         v = su->scale;
 762         if (SCALE_MM == su->unit && 0.0 == (v /= 100.0))
 763                 v = 1.0;
 764
 765         bufcat_fmt(h, "%s: %.2f%s;", p, v, roffscales[su->unit]);
 766 }
 767
 768 void
 769 bufcat_id(struct html *h, const char *src)
 770 {
 771
 772         /* Cf. <http://www.w3.org/TR/html4/types.html#h-6.2>. */
 773
 774         while ('\0' != *src)
 775                 bufcat_fmt(h, "%.2x", *src++);
 776 }