term.c

   1 /*      $Id: term.c,v 1.219 2014/03/30 21:28:01 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2010-2014 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 <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "mandoc.h"
  31 #include "mandoc_aux.h"
  32 #include "out.h"
  33 #include "term.h"
  34 #include "main.h"
  35
  36 static  size_t           cond_width(const struct termp *, int, int *);
  37 static  void             adjbuf(struct termp *p, size_t);
  38 static  void             bufferc(struct termp *, char);
  39 static  void             encode(struct termp *, const char *, size_t);
  40 static  void             encode1(struct termp *, int);
  41
  42 void
  43 term_free(struct termp *p)
  44 {
  45
  46         if (p->buf)
  47                 free(p->buf);
  48         if (p->symtab)
  49                 mchars_free(p->symtab);
  50
  51         free(p);
  52 }
  53
  54
  55 void
  56 term_begin(struct termp *p, term_margin head,
  57                 term_margin foot, const void *arg)
  58 {
  59
  60         p->headf = head;
  61         p->footf = foot;
  62         p->argf = arg;
  63         (*p->begin)(p);
  64 }
  65
  66
  67 void
  68 term_end(struct termp *p)
  69 {
  70
  71         (*p->end)(p);
  72 }
  73
  74 /*
  75  * Flush a line of text.  A "line" is loosely defined as being something
  76  * that should be followed by a newline, regardless of whether it's
  77  * broken apart by newlines getting there.  A line can also be a
  78  * fragment of a columnar list (`Bl -tag' or `Bl -column'), which does
  79  * not have a trailing newline.
  80  *
  81  * The following flags may be specified:
  82  *
  83  *  - TERMP_NOBREAK: this is the most important and is used when making
  84  *    columns.  In short: don't print a newline and instead expect the
  85  *    next call to do the padding up to the start of the next column.
  86  *    p->trailspace may be set to 0, 1, or 2, depending on how many
  87  *    space characters are required at the end of the column.
  88  *
  89  *  - TERMP_DANGLE: don't newline when TERMP_NOBREAK is specified and
  90  *    the line is overrun, and don't pad-right if it's underrun.
  91  *
  92  *  - TERMP_HANG: like TERMP_DANGLE, but doesn't newline when
  93  *    overrunning, instead save the position and continue at that point
  94  *    when the next invocation.
  95  *
  96  *  In-line line breaking:
  97  *
  98  *  If TERMP_NOBREAK is specified and the line overruns the right
  99  *  margin, it will break and pad-right to the right margin after
 100  *  writing.  If maxrmargin is violated, it will break and continue
 101  *  writing from the right-margin, which will lead to the above scenario
 102  *  upon exit.  Otherwise, the line will break at the right margin.
 103  */
 104 void
 105 term_flushln(struct termp *p)
 106 {
 107         size_t           i;     /* current input position in p->buf */
 108         int              ntab;  /* number of tabs to prepend */
 109         size_t           vis;   /* current visual position on output */
 110         size_t           vbl;   /* number of blanks to prepend to output */
 111         size_t           vend;  /* end of word visual position on output */
 112         size_t           bp;    /* visual right border position */
 113         size_t           dv;    /* temporary for visual pos calculations */
 114         size_t           j;     /* temporary loop index for p->buf */
 115         size_t           jhy;   /* last hyph before overflow w/r/t j */
 116         size_t           maxvis; /* output position of visible boundary */
 117         size_t           mmax; /* used in calculating bp */
 118
 119         /*
 120          * First, establish the maximum columns of "visible" content.
 121          * This is usually the difference between the right-margin and
 122          * an indentation, but can be, for tagged lists or columns, a
 123          * small set of values.
 124          *
 125          * The following unsigned-signed subtractions look strange,
 126          * but they are actually correct.  If the int p->overstep
 127          * is negative, it gets sign extended.  Subtracting that
 128          * very large size_t effectively adds a small number to dv.
 129          */
 130         assert  (p->rmargin >= p->offset);
 131         dv     = p->rmargin - p->offset;
 132         maxvis = (int)dv > p->overstep ? dv - (size_t)p->overstep : 0;
 133         dv     = p->maxrmargin - p->offset;
 134         mmax   = (int)dv > p->overstep ? dv - (size_t)p->overstep : 0;
 135
 136         bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
 137
 138         /*
 139          * Calculate the required amount of padding.
 140          */
 141         vbl = p->offset + p->overstep > p->viscol ?
 142               p->offset + p->overstep - p->viscol : 0;
 143
 144         vis = vend = 0;
 145         i = 0;
 146
 147         while (i < p->col) {
 148                 /*
 149                  * Handle literal tab characters: collapse all
 150                  * subsequent tabs into a single huge set of spaces.
 151                  */
 152                 ntab = 0;
 153                 while (i < p->col && '\t' == p->buf[i]) {
 154                         vend = (vis / p->tabwidth + 1) * p->tabwidth;
 155                         vbl += vend - vis;
 156                         vis = vend;
 157                         ntab++;
 158                         i++;
 159                 }
 160
 161                 /*
 162                  * Count up visible word characters.  Control sequences
 163                  * (starting with the CSI) aren't counted.  A space
 164                  * generates a non-printing word, which is valid (the
 165                  * space is printed according to regular spacing rules).
 166                  */
 167
 168                 for (j = i, jhy = 0; j < p->col; j++) {
 169                         if (' ' == p->buf[j] || '\t' == p->buf[j])
 170                                 break;
 171
 172                         /* Back over the the last printed character. */
 173                         if (8 == p->buf[j]) {
 174                                 assert(j);
 175                                 vend -= (*p->width)(p, p->buf[j - 1]);
 176                                 continue;
 177                         }
 178
 179                         /* Regular word. */
 180                         /* Break at the hyphen point if we overrun. */
 181                         if (vend > vis && vend < bp &&
 182                             (ASCII_HYPH == p->buf[j] ||
 183                              ASCII_BREAK == p->buf[j]))
 184                                 jhy = j;
 185
 186                         /*
 187                          * Hyphenation now decided, put back a real
 188                          * hyphen such that we get the correct width.
 189                          */
 190                         if (ASCII_HYPH == p->buf[j])
 191                                 p->buf[j] = '-';
 192
 193                         vend += (*p->width)(p, p->buf[j]);
 194                 }
 195
 196                 /*
 197                  * Find out whether we would exceed the right margin.
 198                  * If so, break to the next line.
 199                  */
 200                 if (vend > bp && 0 == jhy && vis > 0) {
 201                         vend -= vis;
 202                         (*p->endline)(p);
 203                         p->viscol = 0;
 204                         if (TERMP_NOBREAK & p->flags) {
 205                                 vbl = p->rmargin;
 206                                 vend += p->rmargin - p->offset;
 207                         } else
 208                                 vbl = p->offset;
 209
 210                         /* use pending tabs on the new line */
 211
 212                         if (0 < ntab)
 213                                 vbl += ntab * p->tabwidth;
 214
 215                         /*
 216                          * Remove the p->overstep width.
 217                          * Again, if p->overstep is negative,
 218                          * sign extension does the right thing.
 219                          */
 220
 221                         bp += (size_t)p->overstep;
 222                         p->overstep = 0;
 223                 }
 224
 225                 /* Write out the [remaining] word. */
 226                 for ( ; i < p->col; i++) {
 227                         if (vend > bp && jhy > 0 && i > jhy)
 228                                 break;
 229                         if ('\t' == p->buf[i])
 230                                 break;
 231                         if (' ' == p->buf[i]) {
 232                                 j = i;
 233                                 while (' ' == p->buf[i])
 234                                         i++;
 235                                 dv = (i - j) * (*p->width)(p, ' ');
 236                                 vbl += dv;
 237                                 vend += dv;
 238                                 break;
 239                         }
 240                         if (ASCII_NBRSP == p->buf[i]) {
 241                                 vbl += (*p->width)(p, ' ');
 242                                 continue;
 243                         }
 244                         if (ASCII_BREAK == p->buf[i])
 245                                 continue;
 246
 247                         /*
 248                          * Now we definitely know there will be
 249                          * printable characters to output,
 250                          * so write preceding white space now.
 251                          */
 252                         if (vbl) {
 253                                 (*p->advance)(p, vbl);
 254                                 p->viscol += vbl;
 255                                 vbl = 0;
 256                         }
 257
 258                         (*p->letter)(p, p->buf[i]);
 259                         if (8 == p->buf[i])
 260                                 p->viscol -= (*p->width)(p, p->buf[i-1]);
 261                         else
 262                                 p->viscol += (*p->width)(p, p->buf[i]);
 263                 }
 264                 vis = vend;
 265         }
 266
 267         /*
 268          * If there was trailing white space, it was not printed;
 269          * so reset the cursor position accordingly.
 270          */
 271         if (vis)
 272                 vis -= vbl;
 273
 274         p->col = 0;
 275         p->overstep = 0;
 276
 277         if ( ! (TERMP_NOBREAK & p->flags)) {
 278                 p->viscol = 0;
 279                 (*p->endline)(p);
 280                 return;
 281         }
 282
 283         if (TERMP_HANG & p->flags) {
 284                 p->overstep = (int)(vis - maxvis +
 285                                 p->trailspace * (*p->width)(p, ' '));
 286
 287                 /*
 288                  * If we have overstepped the margin, temporarily move
 289                  * it to the right and flag the rest of the line to be
 290                  * shorter.
 291                  * If there is a request to keep the columns together,
 292                  * allow negative overstep when the column is not full.
 293                  */
 294                 if (p->trailspace && p->overstep < 0)
 295                         p->overstep = 0;
 296                 return;
 297
 298         } else if (TERMP_DANGLE & p->flags)
 299                 return;
 300
 301         /* If the column was overrun, break the line. */
 302         if (maxvis < vis + p->trailspace * (*p->width)(p, ' ')) {
 303                 (*p->endline)(p);
 304                 p->viscol = 0;
 305         }
 306 }
 307
 308
 309 /*
 310  * A newline only breaks an existing line; it won't assert vertical
 311  * space.  All data in the output buffer is flushed prior to the newline
 312  * assertion.
 313  */
 314 void
 315 term_newln(struct termp *p)
 316 {
 317
 318         p->flags |= TERMP_NOSPACE;
 319         if (p->col || p->viscol)
 320                 term_flushln(p);
 321 }
 322
 323
 324 /*
 325  * Asserts a vertical space (a full, empty line-break between lines).
 326  * Note that if used twice, this will cause two blank spaces and so on.
 327  * All data in the output buffer is flushed prior to the newline
 328  * assertion.
 329  */
 330 void
 331 term_vspace(struct termp *p)
 332 {
 333
 334         term_newln(p);
 335         p->viscol = 0;
 336         if (0 < p->skipvsp)
 337                 p->skipvsp--;
 338         else
 339                 (*p->endline)(p);
 340 }
 341
 342 void
 343 term_fontlast(struct termp *p)
 344 {
 345         enum termfont    f;
 346
 347         f = p->fontl;
 348         p->fontl = p->fontq[p->fonti];
 349         p->fontq[p->fonti] = f;
 350 }
 351
 352
 353 void
 354 term_fontrepl(struct termp *p, enum termfont f)
 355 {
 356
 357         p->fontl = p->fontq[p->fonti];
 358         p->fontq[p->fonti] = f;
 359 }
 360
 361
 362 void
 363 term_fontpush(struct termp *p, enum termfont f)
 364 {
 365
 366         assert(p->fonti + 1 < 10);
 367         p->fontl = p->fontq[p->fonti];
 368         p->fontq[++p->fonti] = f;
 369 }
 370
 371
 372 const void *
 373 term_fontq(struct termp *p)
 374 {
 375
 376         return(&p->fontq[p->fonti]);
 377 }
 378
 379
 380 enum termfont
 381 term_fonttop(struct termp *p)
 382 {
 383
 384         return(p->fontq[p->fonti]);
 385 }
 386
 387
 388 void
 389 term_fontpopq(struct termp *p, const void *key)
 390 {
 391
 392         while (p->fonti >= 0 && key < (void *)(p->fontq + p->fonti))
 393                 p->fonti--;
 394         assert(p->fonti >= 0);
 395 }
 396
 397
 398 void
 399 term_fontpop(struct termp *p)
 400 {
 401
 402         assert(p->fonti);
 403         p->fonti--;
 404 }
 405
 406 /*
 407  * Handle pwords, partial words, which may be either a single word or a
 408  * phrase that cannot be broken down (such as a literal string).  This
 409  * handles word styling.
 410  */
 411 void
 412 term_word(struct termp *p, const char *word)
 413 {
 414         const char       nbrsp[2] = { ASCII_NBRSP, 0 };
 415         const char      *seq, *cp;
 416         char             c;
 417         int              sz, uc;
 418         size_t           ssz;
 419         enum mandoc_esc  esc;
 420
 421         if ( ! (TERMP_NOSPACE & p->flags)) {
 422                 if ( ! (TERMP_KEEP & p->flags)) {
 423                         bufferc(p, ' ');
 424                         if (TERMP_SENTENCE & p->flags)
 425                                 bufferc(p, ' ');
 426                 } else
 427                         bufferc(p, ASCII_NBRSP);
 428         }
 429         if (TERMP_PREKEEP & p->flags)
 430                 p->flags |= TERMP_KEEP;
 431
 432         if ( ! (p->flags & TERMP_NONOSPACE))
 433                 p->flags &= ~TERMP_NOSPACE;
 434         else
 435                 p->flags |= TERMP_NOSPACE;
 436
 437         p->flags &= ~TERMP_SENTENCE;
 438
 439         while ('\0' != *word) {
 440                 if ('\\' != *word) {
 441                         if (TERMP_SKIPCHAR & p->flags) {
 442                                 p->flags &= ~TERMP_SKIPCHAR;
 443                                 word++;
 444                                 continue;
 445                         }
 446                         if (TERMP_NBRWORD & p->flags) {
 447                                 if (' ' == *word) {
 448                                         encode(p, nbrsp, 1);
 449                                         word++;
 450                                         continue;
 451                                 }
 452                                 ssz = strcspn(word, "\\ ");
 453                         } else
 454                                 ssz = strcspn(word, "\\");
 455                         encode(p, word, ssz);
 456                         word += (int)ssz;
 457                         continue;
 458                 }
 459
 460                 word++;
 461                 esc = mandoc_escape(&word, &seq, &sz);
 462                 if (ESCAPE_ERROR == esc)
 463                         break;
 464
 465                 if (TERMENC_ASCII != p->enc)
 466                         switch (esc) {
 467                         case (ESCAPE_UNICODE):
 468                                 uc = mchars_num2uc(seq + 1, sz - 1);
 469                                 if ('\0' == uc)
 470                                         break;
 471                                 encode1(p, uc);
 472                                 continue;
 473                         case (ESCAPE_SPECIAL):
 474                                 uc = mchars_spec2cp(p->symtab, seq, sz);
 475                                 if (uc <= 0)
 476                                         break;
 477                                 encode1(p, uc);
 478                                 continue;
 479                         default:
 480                                 break;
 481                         }
 482
 483                 switch (esc) {
 484                 case (ESCAPE_UNICODE):
 485                         encode1(p, '?');
 486                         break;
 487                 case (ESCAPE_NUMBERED):
 488                         c = mchars_num2char(seq, sz);
 489                         if ('\0' != c)
 490                                 encode(p, &c, 1);
 491                         break;
 492                 case (ESCAPE_SPECIAL):
 493                         cp = mchars_spec2str(p->symtab, seq, sz, &ssz);
 494                         if (NULL != cp)
 495                                 encode(p, cp, ssz);
 496                         else if (1 == ssz)
 497                                 encode(p, seq, sz);
 498                         break;
 499                 case (ESCAPE_FONTBOLD):
 500                         term_fontrepl(p, TERMFONT_BOLD);
 501                         break;
 502                 case (ESCAPE_FONTITALIC):
 503                         term_fontrepl(p, TERMFONT_UNDER);
 504                         break;
 505                 case (ESCAPE_FONTBI):
 506                         term_fontrepl(p, TERMFONT_BI);
 507                         break;
 508                 case (ESCAPE_FONT):
 509                         /* FALLTHROUGH */
 510                 case (ESCAPE_FONTROMAN):
 511                         term_fontrepl(p, TERMFONT_NONE);
 512                         break;
 513                 case (ESCAPE_FONTPREV):
 514                         term_fontlast(p);
 515                         break;
 516                 case (ESCAPE_NOSPACE):
 517                         if (TERMP_SKIPCHAR & p->flags)
 518                                 p->flags &= ~TERMP_SKIPCHAR;
 519                         else if ('\0' == *word)
 520                                 p->flags |= TERMP_NOSPACE;
 521                         break;
 522                 case (ESCAPE_SKIPCHAR):
 523                         p->flags |= TERMP_SKIPCHAR;
 524                         break;
 525                 default:
 526                         break;
 527                 }
 528         }
 529         p->flags &= ~TERMP_NBRWORD;
 530 }
 531
 532 static void
 533 adjbuf(struct termp *p, size_t sz)
 534 {
 535
 536         if (0 == p->maxcols)
 537                 p->maxcols = 1024;
 538         while (sz >= p->maxcols)
 539                 p->maxcols <<= 2;
 540
 541         p->buf = mandoc_realloc(p->buf, sizeof(int) * p->maxcols);
 542 }
 543
 544 static void
 545 bufferc(struct termp *p, char c)
 546 {
 547
 548         if (p->col + 1 >= p->maxcols)
 549                 adjbuf(p, p->col + 1);
 550
 551         p->buf[p->col++] = c;
 552 }
 553
 554 /*
 555  * See encode().
 556  * Do this for a single (probably unicode) value.
 557  * Does not check for non-decorated glyphs.
 558  */
 559 static void
 560 encode1(struct termp *p, int c)
 561 {
 562         enum termfont     f;
 563
 564         if (TERMP_SKIPCHAR & p->flags) {
 565                 p->flags &= ~TERMP_SKIPCHAR;
 566                 return;
 567         }
 568
 569         if (p->col + 6 >= p->maxcols)
 570                 adjbuf(p, p->col + 6);
 571
 572         f = term_fonttop(p);
 573
 574         if (TERMFONT_UNDER == f || TERMFONT_BI == f) {
 575                 p->buf[p->col++] = '_';
 576                 p->buf[p->col++] = 8;
 577         }
 578         if (TERMFONT_BOLD == f || TERMFONT_BI == f) {
 579                 if (ASCII_HYPH == c)
 580                         p->buf[p->col++] = '-';
 581                 else
 582                         p->buf[p->col++] = c;
 583                 p->buf[p->col++] = 8;
 584         }
 585         p->buf[p->col++] = c;
 586 }
 587
 588 static void
 589 encode(struct termp *p, const char *word, size_t sz)
 590 {
 591         size_t            i;
 592
 593         if (TERMP_SKIPCHAR & p->flags) {
 594                 p->flags &= ~TERMP_SKIPCHAR;
 595                 return;
 596         }
 597
 598         /*
 599          * Encode and buffer a string of characters.  If the current
 600          * font mode is unset, buffer directly, else encode then buffer
 601          * character by character.
 602          */
 603
 604         if (TERMFONT_NONE == term_fonttop(p)) {
 605                 if (p->col + sz >= p->maxcols)
 606                         adjbuf(p, p->col + sz);
 607                 for (i = 0; i < sz; i++)
 608                         p->buf[p->col++] = word[i];
 609                 return;
 610         }
 611
 612         /* Pre-buffer, assuming worst-case. */
 613
 614         if (p->col + 1 + (sz * 5) >= p->maxcols)
 615                 adjbuf(p, p->col + 1 + (sz * 5));
 616
 617         for (i = 0; i < sz; i++) {
 618                 if (ASCII_HYPH == word[i] ||
 619                     isgraph((unsigned char)word[i]))
 620                         encode1(p, word[i]);
 621                 else
 622                         p->buf[p->col++] = word[i];
 623         }
 624 }
 625
 626 void
 627 term_setwidth(struct termp *p, const char *wstr)
 628 {
 629         struct roffsu    su;
 630         size_t           width;
 631         int              iop;
 632
 633         if (NULL != wstr) {
 634                 switch (*wstr) {
 635                 case ('+'):
 636                         iop = 1;
 637                         wstr++;
 638                         break;
 639                 case ('-'):
 640                         iop = -1;
 641                         wstr++;
 642                         break;
 643                 default:
 644                         iop = 0;
 645                         break;
 646                 }
 647                 if ( ! a2roffsu(wstr, &su, SCALE_MAX)) {
 648                         wstr = NULL;
 649                         iop = 0;
 650                 }
 651         }
 652         width = (NULL != wstr) ? term_hspan(p, &su) : 0;
 653         (*p->setwidth)(p, iop, width);
 654 }
 655
 656 size_t
 657 term_len(const struct termp *p, size_t sz)
 658 {
 659
 660         return((*p->width)(p, ' ') * sz);
 661 }
 662
 663 static size_t
 664 cond_width(const struct termp *p, int c, int *skip)
 665 {
 666
 667         if (*skip) {
 668                 (*skip) = 0;
 669                 return(0);
 670         } else
 671                 return((*p->width)(p, c));
 672 }
 673
 674 size_t
 675 term_strlen(const struct termp *p, const char *cp)
 676 {
 677         size_t           sz, rsz, i;
 678         int              ssz, skip, c;
 679         const char      *seq, *rhs;
 680         enum mandoc_esc  esc;
 681         static const char rej[] = { '\\', ASCII_NBRSP, ASCII_HYPH,
 682                         ASCII_BREAK, '\0' };
 683
 684         /*
 685          * Account for escaped sequences within string length
 686          * calculations.  This follows the logic in term_word() as we
 687          * must calculate the width of produced strings.
 688          */
 689
 690         sz = 0;
 691         skip = 0;
 692         while ('\0' != *cp) {
 693                 rsz = strcspn(cp, rej);
 694                 for (i = 0; i < rsz; i++)
 695                         sz += cond_width(p, *cp++, &skip);
 696
 697                 switch (*cp) {
 698                 case ('\\'):
 699                         cp++;
 700                         esc = mandoc_escape(&cp, &seq, &ssz);
 701                         if (ESCAPE_ERROR == esc)
 702                                 return(sz);
 703
 704                         if (TERMENC_ASCII != p->enc)
 705                                 switch (esc) {
 706                                 case (ESCAPE_UNICODE):
 707                                         c = mchars_num2uc
 708                                                 (seq + 1, ssz - 1);
 709                                         if ('\0' == c)
 710                                                 break;
 711                                         sz += cond_width(p, c, &skip);
 712                                         continue;
 713                                 case (ESCAPE_SPECIAL):
 714                                         c = mchars_spec2cp
 715                                                 (p->symtab, seq, ssz);
 716                                         if (c <= 0)
 717                                                 break;
 718                                         sz += cond_width(p, c, &skip);
 719                                         continue;
 720                                 default:
 721                                         break;
 722                                 }
 723
 724                         rhs = NULL;
 725
 726                         switch (esc) {
 727                         case (ESCAPE_UNICODE):
 728                                 sz += cond_width(p, '?', &skip);
 729                                 break;
 730                         case (ESCAPE_NUMBERED):
 731                                 c = mchars_num2char(seq, ssz);
 732                                 if ('\0' != c)
 733                                         sz += cond_width(p, c, &skip);
 734                                 break;
 735                         case (ESCAPE_SPECIAL):
 736                                 rhs = mchars_spec2str
 737                                         (p->symtab, seq, ssz, &rsz);
 738
 739                                 if (ssz != 1 || rhs)
 740                                         break;
 741
 742                                 rhs = seq;
 743                                 rsz = ssz;
 744                                 break;
 745                         case (ESCAPE_SKIPCHAR):
 746                                 skip = 1;
 747                                 break;
 748                         default:
 749                                 break;
 750                         }
 751
 752                         if (NULL == rhs)
 753                                 break;
 754
 755                         if (skip) {
 756                                 skip = 0;
 757                                 break;
 758                         }
 759
 760                         for (i = 0; i < rsz; i++)
 761                                 sz += (*p->width)(p, *rhs++);
 762                         break;
 763                 case (ASCII_NBRSP):
 764                         sz += cond_width(p, ' ', &skip);
 765                         cp++;
 766                         break;
 767                 case (ASCII_HYPH):
 768                         sz += cond_width(p, '-', &skip);
 769                         cp++;
 770                         /* FALLTHROUGH */
 771                 case (ASCII_BREAK):
 772                         break;
 773                 default:
 774                         break;
 775                 }
 776         }
 777
 778         return(sz);
 779 }
 780
 781 /* ARGSUSED */
 782 size_t
 783 term_vspan(const struct termp *p, const struct roffsu *su)
 784 {
 785         double           r;
 786
 787         switch (su->unit) {
 788         case (SCALE_CM):
 789                 r = su->scale * 2;
 790                 break;
 791         case (SCALE_IN):
 792                 r = su->scale * 6;
 793                 break;
 794         case (SCALE_PC):
 795                 r = su->scale;
 796                 break;
 797         case (SCALE_PT):
 798                 r = su->scale / 8;
 799                 break;
 800         case (SCALE_MM):
 801                 r = su->scale / 1000;
 802                 break;
 803         case (SCALE_VS):
 804                 r = su->scale;
 805                 break;
 806         default:
 807                 r = su->scale - 1;
 808                 break;
 809         }
 810
 811         if (r < 0.0)
 812                 r = 0.0;
 813         return(/* LINTED */(size_t)
 814                         r);
 815 }
 816
 817 size_t
 818 term_hspan(const struct termp *p, const struct roffsu *su)
 819 {
 820         double           v;
 821
 822         v = ((*p->hspan)(p, su));
 823         if (v < 0.0)
 824                 v = 0.0;
 825         return((size_t) /* LINTED */
 826                         v);
 827 }