man_html.c

   1 /*      $Id: man_html.c,v 1.24 2009/11/16 08:46:59 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17 #include <sys/types.h>
  18
  19 #include <assert.h>
  20 #include <ctype.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "out.h"
  26 #include "html.h"
  27 #include "man.h"
  28 #include "main.h"
  29
  30 /* TODO: preserve ident widths. */
  31 /* FIXME: have PD set the default vspace width. */
  32
  33 #define INDENT            5
  34 #define HALFINDENT        3
  35
  36 #define MAN_ARGS          const struct man_meta *m, \
  37                           const struct man_node *n, \
  38                           struct html *h
  39
  40 struct  htmlman {
  41         int             (*pre)(MAN_ARGS);
  42         int             (*post)(MAN_ARGS);
  43 };
  44
  45 static  void              print_man(MAN_ARGS);
  46 static  void              print_man_head(MAN_ARGS);
  47 static  void              print_man_nodelist(MAN_ARGS);
  48 static  void              print_man_node(MAN_ARGS);
  49
  50 static  int               a2width(const struct man_node *,
  51                                 struct roffsu *);
  52
  53 static  int               man_alt_pre(MAN_ARGS);
  54 static  int               man_br_pre(MAN_ARGS);
  55 static  int               man_ign_pre(MAN_ARGS);
  56 static  void              man_root_post(MAN_ARGS);
  57 static  int               man_root_pre(MAN_ARGS);
  58 static  int               man_B_pre(MAN_ARGS);
  59 static  int               man_HP_pre(MAN_ARGS);
  60 static  int               man_I_pre(MAN_ARGS);
  61 static  int               man_IP_pre(MAN_ARGS);
  62 static  int               man_PP_pre(MAN_ARGS);
  63 static  int               man_RS_pre(MAN_ARGS);
  64 static  int               man_SB_pre(MAN_ARGS);
  65 static  int               man_SH_pre(MAN_ARGS);
  66 static  int               man_SM_pre(MAN_ARGS);
  67 static  int               man_SS_pre(MAN_ARGS);
  68
  69 #ifdef __linux__
  70 extern  size_t            strlcpy(char *, const char *, size_t);
  71 extern  size_t            strlcat(char *, const char *, size_t);
  72 #endif
  73
  74 static  const struct htmlman mans[MAN_MAX] = {
  75         { man_br_pre, NULL }, /* br */
  76         { NULL, NULL }, /* TH */
  77         { man_SH_pre, NULL }, /* SH */
  78         { man_SS_pre, NULL }, /* SS */
  79         { man_IP_pre, NULL }, /* TP */
  80         { man_PP_pre, NULL }, /* LP */
  81         { man_PP_pre, NULL }, /* PP */
  82         { man_PP_pre, NULL }, /* P */
  83         { man_IP_pre, NULL }, /* IP */
  84         { man_HP_pre, NULL }, /* HP */
  85         { man_SM_pre, NULL }, /* SM */
  86         { man_SB_pre, NULL }, /* SB */
  87         { man_alt_pre, NULL }, /* BI */
  88         { man_alt_pre, NULL }, /* IB */
  89         { man_alt_pre, NULL }, /* BR */
  90         { man_alt_pre, NULL }, /* RB */
  91         { NULL, NULL }, /* R */
  92         { man_B_pre, NULL }, /* B */
  93         { man_I_pre, NULL }, /* I */
  94         { man_alt_pre, NULL }, /* IR */
  95         { man_alt_pre, NULL }, /* RI */
  96         { NULL, NULL }, /* na */
  97         { NULL, NULL }, /* i */
  98         { man_br_pre, NULL }, /* sp */
  99         { NULL, NULL }, /* nf */
 100         { NULL, NULL }, /* fi */
 101         { NULL, NULL }, /* r */
 102         { NULL, NULL }, /* RE */
 103         { man_RS_pre, NULL }, /* RS */
 104         { man_ign_pre, NULL }, /* DT */
 105         { man_ign_pre, NULL }, /* UC */
 106         { man_ign_pre, NULL }, /* PD */
 107 };
 108
 109
 110 void
 111 html_man(void *arg, const struct man *m)
 112 {
 113         struct html     *h;
 114         struct tag      *t;
 115
 116         h = (struct html *)arg;
 117
 118         print_gen_doctype(h);
 119
 120         t = print_otag(h, TAG_HTML, 0, NULL);
 121         print_man(man_meta(m), man_node(m), h);
 122         print_tagq(h, t);
 123
 124         printf("\n");
 125 }
 126
 127
 128 static void
 129 print_man(MAN_ARGS)
 130 {
 131         struct tag      *t;
 132         struct htmlpair  tag;
 133
 134         t = print_otag(h, TAG_HEAD, 0, NULL);
 135
 136         print_man_head(m, n, h);
 137         print_tagq(h, t);
 138         t = print_otag(h, TAG_BODY, 0, NULL);
 139
 140         tag.key = ATTR_CLASS;
 141         tag.val = "body";
 142         print_otag(h, TAG_DIV, 1, &tag);
 143
 144         print_man_nodelist(m, n, h);
 145
 146         print_tagq(h, t);
 147 }
 148
 149
 150 /* ARGSUSED */
 151 static void
 152 print_man_head(MAN_ARGS)
 153 {
 154
 155         print_gen_head(h);
 156         bufinit(h);
 157         buffmt(h, "%s(%d)", m->title, m->msec);
 158
 159         print_otag(h, TAG_TITLE, 0, NULL);
 160         print_text(h, h->buf);
 161 }
 162
 163
 164 static void
 165 print_man_nodelist(MAN_ARGS)
 166 {
 167
 168         print_man_node(m, n, h);
 169         if (n->next)
 170                 print_man_nodelist(m, n->next, h);
 171 }
 172
 173
 174 static void
 175 print_man_node(MAN_ARGS)
 176 {
 177         int              child;
 178         struct tag      *t;
 179
 180         child = 1;
 181         t = h->tags.head;
 182
 183         bufinit(h);
 184
 185         switch (n->type) {
 186         case (MAN_ROOT):
 187                 child = man_root_pre(m, n, h);
 188                 break;
 189         case (MAN_TEXT):
 190                 print_text(h, n->string);
 191                 return;
 192         default:
 193                 /*
 194                  * Close out scope of font prior to opening a macro
 195                  * scope.  Assert that the metafont is on the top of the
 196                  * stack (it's never nested).
 197                  */
 198                 if (h->metaf) {
 199                         assert(h->metaf == t);
 200                         print_tagq(h, h->metaf);
 201                         assert(NULL == h->metaf);
 202                         t = h->tags.head;
 203                 }
 204                 if (mans[n->tok].pre)
 205                         child = (*mans[n->tok].pre)(m, n, h);
 206                 break;
 207         }
 208
 209         if (child && n->child)
 210                 print_man_nodelist(m, n->child, h);
 211
 212         /* This will automatically close out any font scope. */
 213         print_stagq(h, t);
 214
 215         bufinit(h);
 216
 217         switch (n->type) {
 218         case (MAN_ROOT):
 219                 man_root_post(m, n, h);
 220                 break;
 221         case (MAN_TEXT):
 222                 break;
 223         default:
 224                 if (mans[n->tok].post)
 225                         (*mans[n->tok].post)(m, n, h);
 226                 break;
 227         }
 228 }
 229
 230
 231 static int
 232 a2width(const struct man_node *n, struct roffsu *su)
 233 {
 234
 235         if (MAN_TEXT != n->type)
 236                 return(0);
 237         if (a2roffsu(n->string, su, SCALE_BU))
 238                 return(1);
 239
 240         return(0);
 241 }
 242
 243
 244 /* ARGSUSED */
 245 static int
 246 man_root_pre(MAN_ARGS)
 247 {
 248         struct htmlpair  tag[3];
 249         struct tag      *t, *tt;
 250         char             b[BUFSIZ], title[BUFSIZ];
 251
 252         b[0] = 0;
 253         if (m->vol)
 254                 (void)strlcat(b, m->vol, BUFSIZ);
 255
 256         snprintf(title, BUFSIZ - 1, "%s(%d)", m->title, m->msec);
 257
 258         PAIR_CLASS_INIT(&tag[0], "header");
 259         bufcat_style(h, "width", "100%");
 260         PAIR_STYLE_INIT(&tag[1], h);
 261         PAIR_SUMMARY_INIT(&tag[2], "header");
 262
 263         t = print_otag(h, TAG_TABLE, 3, tag);
 264         tt = print_otag(h, TAG_TR, 0, NULL);
 265
 266         bufinit(h);
 267         bufcat_style(h, "width", "10%");
 268         PAIR_STYLE_INIT(&tag[0], h);
 269         print_otag(h, TAG_TD, 1, tag);
 270         print_text(h, title);
 271         print_stagq(h, tt);
 272
 273         bufinit(h);
 274         bufcat_style(h, "width", "80%");
 275         bufcat_style(h, "white-space", "nowrap");
 276         bufcat_style(h, "text-align", "center");
 277         PAIR_STYLE_INIT(&tag[0], h);
 278         print_otag(h, TAG_TD, 1, tag);
 279         print_text(h, b);
 280         print_stagq(h, tt);
 281
 282         bufinit(h);
 283         bufcat_style(h, "width", "10%");
 284         bufcat_style(h, "text-align", "right");
 285         PAIR_STYLE_INIT(&tag[0], h);
 286         print_otag(h, TAG_TD, 1, tag);
 287         print_text(h, title);
 288         print_tagq(h, t);
 289         return(1);
 290 }
 291
 292
 293 /* ARGSUSED */
 294 static void
 295 man_root_post(MAN_ARGS)
 296 {
 297         struct htmlpair  tag[3];
 298         struct tag      *t, *tt;
 299         char             b[DATESIZ];
 300
 301         time2a(m->date, b, DATESIZ);
 302
 303         PAIR_CLASS_INIT(&tag[0], "footer");
 304         bufcat_style(h, "width", "100%");
 305         PAIR_STYLE_INIT(&tag[1], h);
 306         PAIR_SUMMARY_INIT(&tag[2], "footer");
 307
 308         t = print_otag(h, TAG_TABLE, 3, tag);
 309         tt = print_otag(h, TAG_TR, 0, NULL);
 310
 311         bufinit(h);
 312         bufcat_style(h, "width", "50%");
 313         PAIR_STYLE_INIT(&tag[0], h);
 314         print_otag(h, TAG_TD, 1, tag);
 315         print_text(h, b);
 316         print_stagq(h, tt);
 317
 318         bufinit(h);
 319         bufcat_style(h, "width", "50%");
 320         bufcat_style(h, "text-align", "right");
 321         PAIR_STYLE_INIT(&tag[0], h);
 322         print_otag(h, TAG_TD, 1, tag);
 323         if (m->source)
 324                 print_text(h, m->source);
 325         print_tagq(h, t);
 326 }
 327
 328
 329
 330 /* ARGSUSED */
 331 static int
 332 man_br_pre(MAN_ARGS)
 333 {
 334         struct roffsu    su;
 335         struct htmlpair  tag;
 336
 337         SCALE_VS_INIT(&su, 1);
 338
 339         if (MAN_sp == n->tok && n->child)
 340                 a2roffsu(n->child->string, &su, SCALE_VS);
 341         else if (MAN_br == n->tok)
 342                 su.scale = 0;
 343
 344         bufcat_su(h, "height", &su);
 345         PAIR_STYLE_INIT(&tag, h);
 346         print_otag(h, TAG_DIV, 1, &tag);
 347
 348         /* So the div isn't empty: */
 349         print_text(h, "\\~");
 350
 351         return(0);
 352 }
 353
 354
 355 /* ARGSUSED */
 356 static int
 357 man_SH_pre(MAN_ARGS)
 358 {
 359         struct htmlpair  tag[2];
 360         struct roffsu    su;
 361
 362         if (MAN_BODY == n->type) {
 363                 SCALE_HS_INIT(&su, INDENT);
 364                 bufcat_su(h, "margin-left", &su);
 365                 PAIR_CLASS_INIT(&tag[0], "sec-body");
 366                 PAIR_STYLE_INIT(&tag[1], h);
 367                 print_otag(h, TAG_DIV, 2, tag);
 368                 return(1);
 369         } else if (MAN_BLOCK == n->type) {
 370                 PAIR_CLASS_INIT(&tag[0], "sec-block");
 371                 if (n->prev && MAN_SH == n->prev->tok)
 372                         if (NULL == n->prev->body->child) {
 373                                 print_otag(h, TAG_DIV, 1, tag);
 374                                 return(1);
 375                         }
 376
 377                 SCALE_VS_INIT(&su, 1);
 378                 bufcat_su(h, "margin-top", &su);
 379                 if (NULL == n->next)
 380                         bufcat_su(h, "margin-bottom", &su);
 381                 PAIR_STYLE_INIT(&tag[1], h);
 382                 print_otag(h, TAG_DIV, 2, tag);
 383                 return(1);
 384         }
 385
 386         PAIR_CLASS_INIT(&tag[0], "sec-head");
 387         print_otag(h, TAG_DIV, 1, tag);
 388         return(1);
 389 }
 390
 391
 392 /* ARGSUSED */
 393 static int
 394 man_alt_pre(MAN_ARGS)
 395 {
 396         const struct man_node   *nn;
 397         struct tag              *t;
 398         int                      i;
 399         enum htmlfont            fp;
 400
 401         for (i = 0, nn = n->child; nn; nn = nn->next, i++) {
 402                 switch (n->tok) {
 403                 case (MAN_BI):
 404                         fp = i % 2 ? HTMLFONT_ITALIC : HTMLFONT_BOLD;
 405                         break;
 406                 case (MAN_IB):
 407                         fp = i % 2 ? HTMLFONT_BOLD : HTMLFONT_ITALIC;
 408                         break;
 409                 case (MAN_RI):
 410                         fp = i % 2 ? HTMLFONT_ITALIC : HTMLFONT_NONE;
 411                         break;
 412                 case (MAN_IR):
 413                         fp = i % 2 ? HTMLFONT_NONE : HTMLFONT_ITALIC;
 414                         break;
 415                 case (MAN_BR):
 416                         fp = i % 2 ? HTMLFONT_NONE : HTMLFONT_BOLD;
 417                         break;
 418                 case (MAN_RB):
 419                         fp = i % 2 ? HTMLFONT_BOLD : HTMLFONT_NONE;
 420                         break;
 421                 default:
 422                         abort();
 423                         /* NOTREACHED */
 424                 }
 425
 426                 if (i)
 427                         h->flags |= HTML_NOSPACE;
 428
 429                 /*
 430                  * Open and close the scope with each argument, so that
 431                  * internal \f escapes, which are common, are also
 432                  * closed out with the scope.
 433                  */
 434                 t = print_ofont(h, fp);
 435                 print_man_node(m, nn, h);
 436                 print_tagq(h, t);
 437         }
 438
 439         return(0);
 440 }
 441
 442
 443 /* ARGSUSED */
 444 static int
 445 man_SB_pre(MAN_ARGS)
 446 {
 447         struct htmlpair  tag;
 448
 449         /* FIXME: print_ofont(). */
 450         PAIR_CLASS_INIT(&tag, "small bold");
 451         print_otag(h, TAG_SPAN, 1, &tag);
 452         return(1);
 453 }
 454
 455
 456 /* ARGSUSED */
 457 static int
 458 man_SM_pre(MAN_ARGS)
 459 {
 460         struct htmlpair  tag;
 461
 462         PAIR_CLASS_INIT(&tag, "small");
 463         print_otag(h, TAG_SPAN, 1, &tag);
 464         return(1);
 465 }
 466
 467
 468 /* ARGSUSED */
 469 static int
 470 man_SS_pre(MAN_ARGS)
 471 {
 472         struct htmlpair  tag[3];
 473         struct roffsu    su;
 474
 475         SCALE_VS_INIT(&su, 1);
 476
 477         if (MAN_BODY == n->type) {
 478                 PAIR_CLASS_INIT(&tag[0], "ssec-body");
 479                 if (n->parent->next && n->child) {
 480                         bufcat_su(h, "margin-bottom", &su);
 481                         PAIR_STYLE_INIT(&tag[1], h);
 482                         print_otag(h, TAG_DIV, 2, tag);
 483                         return(1);
 484                 }
 485
 486                 print_otag(h, TAG_DIV, 1, tag);
 487                 return(1);
 488         } else if (MAN_BLOCK == n->type) {
 489                 PAIR_CLASS_INIT(&tag[0], "ssec-block");
 490                 if (n->prev && MAN_SS == n->prev->tok)
 491                         if (n->prev->body->child) {
 492                                 bufcat_su(h, "margin-top", &su);
 493                                 PAIR_STYLE_INIT(&tag[1], h);
 494                                 print_otag(h, TAG_DIV, 2, tag);
 495                                 return(1);
 496                         }
 497
 498                 print_otag(h, TAG_DIV, 1, tag);
 499                 return(1);
 500         }
 501
 502         SCALE_HS_INIT(&su, INDENT - HALFINDENT);
 503         bufcat_su(h, "margin-left", &su);
 504         PAIR_CLASS_INIT(&tag[0], "ssec-head");
 505         PAIR_STYLE_INIT(&tag[1], h);
 506         print_otag(h, TAG_DIV, 2, tag);
 507         return(1);
 508 }
 509
 510
 511 /* ARGSUSED */
 512 static int
 513 man_PP_pre(MAN_ARGS)
 514 {
 515         struct htmlpair  tag;
 516         struct roffsu    su;
 517         int              i;
 518
 519         if (MAN_BLOCK != n->type)
 520                 return(1);
 521
 522         i = 0;
 523
 524         if (MAN_ROOT == n->parent->type) {
 525                 SCALE_HS_INIT(&su, INDENT);
 526                 bufcat_su(h, "margin-left", &su);
 527                 i = 1;
 528         }
 529         if (n->prev) {
 530                 SCALE_VS_INIT(&su, 1);
 531                 bufcat_su(h, "margin-top", &su);
 532                 i = 1;
 533         }
 534
 535         PAIR_STYLE_INIT(&tag, h);
 536         print_otag(h, TAG_DIV, i, &tag);
 537         return(1);
 538 }
 539
 540
 541 /* ARGSUSED */
 542 static int
 543 man_IP_pre(MAN_ARGS)
 544 {
 545         struct roffsu            su;
 546         struct htmlpair          tag;
 547         const struct man_node   *nn;
 548         int                      width;
 549
 550         /*
 551          * This scattering of 1-BU margins and pads is to make sure that
 552          * when text overruns its box, the subsequent text isn't flush
 553          * up against it.  However, the rest of the right-hand box must
 554          * also be adjusted in consideration of this 1-BU space.
 555          */
 556
 557         if (MAN_BODY == n->type) {
 558                 SCALE_HS_INIT(&su, INDENT);
 559                 bufcat_su(h, "margin-left", &su);
 560                 PAIR_STYLE_INIT(&tag, h);
 561                 print_otag(h, TAG_DIV, 1, &tag);
 562                 return(1);
 563         }
 564
 565         nn = MAN_BLOCK == n->type ?
 566                 n->head->child : n->parent->head->child;
 567
 568         SCALE_HS_INIT(&su, INDENT);
 569         width = 0;
 570
 571         if (MAN_IP == n->tok && NULL != nn)
 572                 if (NULL != (nn = nn->next)) {
 573                         for ( ; nn->next; nn = nn->next)
 574                                 /* Do nothing. */ ;
 575                         width = a2width(nn, &su);
 576                 }
 577
 578         if (MAN_TP == n->tok && NULL != nn)
 579                 width = a2width(nn, &su);
 580
 581         if (MAN_BLOCK == n->type) {
 582                 bufcat_su(h, "margin-left", &su);
 583                 SCALE_VS_INIT(&su, 1);
 584                 bufcat_su(h, "margin-top", &su);
 585                 bufcat_style(h, "clear", "both");
 586                 PAIR_STYLE_INIT(&tag, h);
 587                 print_otag(h, TAG_DIV, 1, &tag);
 588                 return(1);
 589         }
 590
 591         bufcat_su(h, "min-width", &su);
 592         SCALE_INVERT(&su);
 593         bufcat_su(h, "margin-left", &su);
 594         SCALE_HS_INIT(&su, 1);
 595         bufcat_su(h, "margin-right", &su);
 596         bufcat_style(h, "clear", "left");
 597
 598         if (n->next && n->next->child)
 599                 bufcat_style(h, "float", "left");
 600
 601         PAIR_STYLE_INIT(&tag, h);
 602         print_otag(h, TAG_DIV, 1, &tag);
 603
 604         /* With a length string, manually omit the last child. */
 605
 606         if ( ! width)
 607                 return(1);
 608
 609         if (MAN_IP == n->tok)
 610                 for (nn = n->child; nn->next; nn = nn->next)
 611                         print_man_node(m, nn, h);
 612         if (MAN_TP == n->tok)
 613                 for (nn = n->child->next; nn; nn = nn->next)
 614                         print_man_node(m, nn, h);
 615
 616         return(0);
 617 }
 618
 619
 620 /* ARGSUSED */
 621 static int
 622 man_HP_pre(MAN_ARGS)
 623 {
 624         const struct man_node   *nn;
 625         struct htmlpair          tag;
 626         struct roffsu            su;
 627
 628         if (MAN_HEAD == n->type)
 629                 return(0);
 630
 631         nn = MAN_BLOCK == n->type ?
 632                 n->head->child : n->parent->head->child;
 633
 634         SCALE_HS_INIT(&su, INDENT);
 635
 636         if (NULL != nn)
 637                 (void)a2width(nn, &su);
 638
 639         if (MAN_BLOCK == n->type) {
 640                 bufcat_su(h, "margin-left", &su);
 641                 SCALE_VS_INIT(&su, 1);
 642                 bufcat_su(h, "margin-top", &su);
 643                 bufcat_style(h, "clear", "both");
 644                 PAIR_STYLE_INIT(&tag, h);
 645                 print_otag(h, TAG_DIV, 1, &tag);
 646                 return(1);
 647         }
 648
 649         bufcat_su(h, "margin-left", &su);
 650         SCALE_INVERT(&su);
 651         bufcat_su(h, "text-indent", &su);
 652
 653         PAIR_STYLE_INIT(&tag, h);
 654         print_otag(h, TAG_DIV, 1, &tag);
 655         return(1);
 656 }
 657
 658
 659 /* ARGSUSED */
 660 static int
 661 man_B_pre(MAN_ARGS)
 662 {
 663
 664         print_ofont(h, HTMLFONT_BOLD);
 665         return(1);
 666 }
 667
 668
 669 /* ARGSUSED */
 670 static int
 671 man_I_pre(MAN_ARGS)
 672 {
 673
 674         print_ofont(h, HTMLFONT_ITALIC);
 675         return(1);
 676 }
 677
 678
 679 /* ARGSUSED */
 680 static int
 681 man_ign_pre(MAN_ARGS)
 682 {
 683
 684         return(0);
 685 }
 686
 687
 688 /* ARGSUSED */
 689 static int
 690 man_RS_pre(MAN_ARGS)
 691 {
 692         struct htmlpair  tag;
 693         struct roffsu    su;
 694
 695         if (MAN_HEAD == n->type)
 696                 return(0);
 697         else if (MAN_BODY == n->type)
 698                 return(1);
 699
 700         SCALE_HS_INIT(&su, INDENT);
 701         bufcat_su(h, "margin-left", &su);
 702
 703         if (n->head->child) {
 704                 SCALE_VS_INIT(&su, 1);
 705                 a2width(n->head->child, &su);
 706                 bufcat_su(h, "margin-top", &su);
 707         }
 708
 709         PAIR_STYLE_INIT(&tag, h);
 710         print_otag(h, TAG_DIV, 1, &tag);
 711         return(1);
 712 }