1 /* $Id: term.c,v 1.259 2017/01/08 18:16:58 schwarze Exp $ */ 2 /* 3 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv> 4 * Copyright (c) 2010-2017 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 <stdio.h> 25 #include <stdlib.h> 26 #include <string.h> 27 28 #include "mandoc.h" 29 #include "mandoc_aux.h" 30 #include "out.h" 31 #include "term.h" 32 #include "main.h" 33 34 static size_t cond_width(const struct termp *, int, int *); 35 static void adjbuf(struct termp *p, size_t); 36 static void bufferc(struct termp *, char); 37 static void encode(struct termp *, const char *, size_t); 38 static void encode1(struct termp *, int); 39 40 41 void 42 term_free(struct termp *p) 43 { 44 45 free(p->buf); 46 free(p->fontq); 47 free(p); 48 } 49 50 void 51 term_begin(struct termp *p, term_margin head, 52 term_margin foot, const struct roff_meta *arg) 53 { 54 55 p->headf = head; 56 p->footf = foot; 57 p->argf = arg; 58 (*p->begin)(p); 59 } 60 61 void 62 term_end(struct termp *p) 63 { 64 65 (*p->end)(p); 66 } 67 68 /* 69 * Flush a chunk of text. By default, break the output line each time 70 * the right margin is reached, and continue output on the next line 71 * at the same offset as the chunk itself. By default, also break the 72 * output line at the end of the chunk. 73 * The following flags may be specified: 74 * 75 * - TERMP_NOBREAK: Do not break the output line at the right margin, 76 * but only at the max right margin. Also, do not break the output 77 * line at the end of the chunk, such that the next call can pad to 78 * the next column. However, if less than p->trailspace blanks, 79 * which can be 0, 1, or 2, remain to the right margin, the line 80 * will be broken. 81 * - TERMP_BRTRSP: Consider trailing whitespace significant 82 * when deciding whether the chunk fits or not. 83 * - TERMP_BRIND: If the chunk does not fit and the output line has 84 * to be broken, start the next line at the right margin instead 85 * of at the offset. Used together with TERMP_NOBREAK for the tags 86 * in various kinds of tagged lists. 87 * - TERMP_DANGLE: Do not break the output line at the right margin, 88 * append the next chunk after it even if this one is too long. 89 * To be used together with TERMP_NOBREAK. 90 * - TERMP_HANG: Like TERMP_DANGLE, and also suppress padding before 91 * the next chunk if this column is not full. 92 */ 93 void 94 term_flushln(struct termp *p) 95 { 96 size_t i; /* current input position in p->buf */ 97 int ntab; /* number of tabs to prepend */ 98 size_t vis; /* current visual position on output */ 99 size_t vbl; /* number of blanks to prepend to output */ 100 size_t vend; /* end of word visual position on output */ 101 size_t bp; /* visual right border position */ 102 size_t dv; /* temporary for visual pos calculations */ 103 size_t j; /* temporary loop index for p->buf */ 104 size_t jhy; /* last hyph before overflow w/r/t j */ 105 size_t maxvis; /* output position of visible boundary */ 106 107 /* 108 * First, establish the maximum columns of "visible" content. 109 * This is usually the difference between the right-margin and 110 * an indentation, but can be, for tagged lists or columns, a 111 * small set of values. 112 * 113 * The following unsigned-signed subtractions look strange, 114 * but they are actually correct. If the int p->overstep 115 * is negative, it gets sign extended. Subtracting that 116 * very large size_t effectively adds a small number to dv. 117 */ 118 dv = p->rmargin > p->offset ? p->rmargin - p->offset : 0; 119 maxvis = (int)dv > p->overstep ? dv - (size_t)p->overstep : 0; 120 121 if (p->flags & TERMP_NOBREAK) { 122 dv = p->maxrmargin > p->offset ? 123 p->maxrmargin - p->offset : 0; 124 bp = (int)dv > p->overstep ? 125 dv - (size_t)p->overstep : 0; 126 } else 127 bp = maxvis; 128 129 /* 130 * Calculate the required amount of padding. 131 */ 132 vbl = p->offset + p->overstep > p->viscol ? 133 p->offset + p->overstep - p->viscol : 0; 134 135 vis = vend = 0; 136 i = 0; 137 138 while (i < p->col) { 139 /* 140 * Handle literal tab characters: collapse all 141 * subsequent tabs into a single huge set of spaces. 142 */ 143 ntab = 0; 144 while (i < p->col && '\t' == p->buf[i]) { 145 vend = (vis / p->tabwidth + 1) * p->tabwidth; 146 vbl += vend - vis; 147 vis = vend; 148 ntab++; 149 i++; 150 } 151 152 /* 153 * Count up visible word characters. Control sequences 154 * (starting with the CSI) aren't counted. A space 155 * generates a non-printing word, which is valid (the 156 * space is printed according to regular spacing rules). 157 */ 158 159 for (j = i, jhy = 0; j < p->col; j++) { 160 if (' ' == p->buf[j] || '\t' == p->buf[j]) 161 break; 162 163 /* Back over the last printed character. */ 164 if (8 == p->buf[j]) { 165 assert(j); 166 vend -= (*p->width)(p, p->buf[j - 1]); 167 continue; 168 } 169 170 /* Regular word. */ 171 /* Break at the hyphen point if we overrun. */ 172 if (vend > vis && vend < bp && 173 (ASCII_HYPH == p->buf[j] || 174 ASCII_BREAK == p->buf[j])) 175 jhy = j; 176 177 /* 178 * Hyphenation now decided, put back a real 179 * hyphen such that we get the correct width. 180 */ 181 if (ASCII_HYPH == p->buf[j]) 182 p->buf[j] = '-'; 183 184 vend += (*p->width)(p, p->buf[j]); 185 } 186 187 /* 188 * Find out whether we would exceed the right margin. 189 * If so, break to the next line. 190 */ 191 if (vend > bp && 0 == jhy && vis > 0) { 192 vend -= vis; 193 (*p->endline)(p); 194 p->viscol = 0; 195 if (TERMP_BRIND & p->flags) { 196 vbl = p->rmargin; 197 vend += p->rmargin; 198 vend -= p->offset; 199 } else 200 vbl = p->offset; 201 202 /* use pending tabs on the new line */ 203 204 if (0 < ntab) 205 vbl += ntab * p->tabwidth; 206 207 /* 208 * Remove the p->overstep width. 209 * Again, if p->overstep is negative, 210 * sign extension does the right thing. 211 */ 212 213 bp += (size_t)p->overstep; 214 p->overstep = 0; 215 } 216 217 /* Write out the [remaining] word. */ 218 for ( ; i < p->col; i++) { 219 if (vend > bp && jhy > 0 && i > jhy) 220 break; 221 if ('\t' == p->buf[i]) 222 break; 223 if (' ' == p->buf[i]) { 224 j = i; 225 while (i < p->col && ' ' == p->buf[i]) 226 i++; 227 dv = (i - j) * (*p->width)(p, ' '); 228 vbl += dv; 229 vend += dv; 230 break; 231 } 232 if (ASCII_NBRSP == p->buf[i]) { 233 vbl += (*p->width)(p, ' '); 234 continue; 235 } 236 if (ASCII_BREAK == p->buf[i]) 237 continue; 238 239 /* 240 * Now we definitely know there will be 241 * printable characters to output, 242 * so write preceding white space now. 243 */ 244 if (vbl) { 245 (*p->advance)(p, vbl); 246 p->viscol += vbl; 247 vbl = 0; 248 } 249 250 (*p->letter)(p, p->buf[i]); 251 if (8 == p->buf[i]) 252 p->viscol -= (*p->width)(p, p->buf[i-1]); 253 else 254 p->viscol += (*p->width)(p, p->buf[i]); 255 } 256 vis = vend; 257 } 258 259 /* 260 * If there was trailing white space, it was not printed; 261 * so reset the cursor position accordingly. 262 */ 263 if (vis > vbl) 264 vis -= vbl; 265 else 266 vis = 0; 267 268 p->col = 0; 269 p->overstep = 0; 270 p->flags &= ~(TERMP_BACKAFTER | TERMP_BACKBEFORE); 271 272 if ( ! (TERMP_NOBREAK & p->flags)) { 273 p->viscol = 0; 274 (*p->endline)(p); 275 return; 276 } 277 278 if (TERMP_HANG & p->flags) { 279 p->overstep += (int)(p->offset + vis - p->rmargin + 280 p->trailspace * (*p->width)(p, ' ')); 281 282 /* 283 * If we have overstepped the margin, temporarily move 284 * it to the right and flag the rest of the line to be 285 * shorter. 286 * If there is a request to keep the columns together, 287 * allow negative overstep when the column is not full. 288 */ 289 if (p->trailspace && p->overstep < 0) 290 p->overstep = 0; 291 return; 292 293 } else if (TERMP_DANGLE & p->flags) 294 return; 295 296 /* Trailing whitespace is significant in some columns. */ 297 if (vis && vbl && (TERMP_BRTRSP & p->flags)) 298 vis += vbl; 299 300 /* If the column was overrun, break the line. */ 301 if (maxvis < vis + p->trailspace * (*p->width)(p, ' ')) { 302 (*p->endline)(p); 303 p->viscol = 0; 304 } 305 } 306 307 /* 308 * A newline only breaks an existing line; it won't assert vertical 309 * space. All data in the output buffer is flushed prior to the newline 310 * assertion. 311 */ 312 void 313 term_newln(struct termp *p) 314 { 315 316 p->flags |= TERMP_NOSPACE; 317 if (p->col || p->viscol) 318 term_flushln(p); 319 } 320 321 /* 322 * Asserts a vertical space (a full, empty line-break between lines). 323 * Note that if used twice, this will cause two blank spaces and so on. 324 * All data in the output buffer is flushed prior to the newline 325 * assertion. 326 */ 327 void 328 term_vspace(struct termp *p) 329 { 330 331 term_newln(p); 332 p->viscol = 0; 333 if (0 < p->skipvsp) 334 p->skipvsp--; 335 else 336 (*p->endline)(p); 337 } 338 339 /* Swap current and previous font; for \fP and .ft P */ 340 void 341 term_fontlast(struct termp *p) 342 { 343 enum termfont f; 344 345 f = p->fontl; 346 p->fontl = p->fontq[p->fonti]; 347 p->fontq[p->fonti] = f; 348 } 349 350 /* Set font, save current, discard previous; for \f, .ft, .B etc. */ 351 void 352 term_fontrepl(struct termp *p, enum termfont f) 353 { 354 355 p->fontl = p->fontq[p->fonti]; 356 p->fontq[p->fonti] = f; 357 } 358 359 /* Set font, save previous. */ 360 void 361 term_fontpush(struct termp *p, enum termfont f) 362 { 363 364 p->fontl = p->fontq[p->fonti]; 365 if (++p->fonti == p->fontsz) { 366 p->fontsz += 8; 367 p->fontq = mandoc_reallocarray(p->fontq, 368 p->fontsz, sizeof(*p->fontq)); 369 } 370 p->fontq[p->fonti] = f; 371 } 372 373 /* Flush to make the saved pointer current again. */ 374 void 375 term_fontpopq(struct termp *p, int i) 376 { 377 378 assert(i >= 0); 379 if (p->fonti > i) 380 p->fonti = i; 381 } 382 383 /* Pop one font off the stack. */ 384 void 385 term_fontpop(struct termp *p) 386 { 387 388 assert(p->fonti); 389 p->fonti--; 390 } 391 392 /* 393 * Handle pwords, partial words, which may be either a single word or a 394 * phrase that cannot be broken down (such as a literal string). This 395 * handles word styling. 396 */ 397 void 398 term_word(struct termp *p, const char *word) 399 { 400 const char nbrsp[2] = { ASCII_NBRSP, 0 }; 401 const char *seq, *cp; 402 int sz, uc; 403 size_t ssz; 404 enum mandoc_esc esc; 405 406 if ( ! (TERMP_NOSPACE & p->flags)) { 407 if ( ! (TERMP_KEEP & p->flags)) { 408 bufferc(p, ' '); 409 if (TERMP_SENTENCE & p->flags) 410 bufferc(p, ' '); 411 } else 412 bufferc(p, ASCII_NBRSP); 413 } 414 if (TERMP_PREKEEP & p->flags) 415 p->flags |= TERMP_KEEP; 416 417 if ( ! (p->flags & TERMP_NONOSPACE)) 418 p->flags &= ~TERMP_NOSPACE; 419 else 420 p->flags |= TERMP_NOSPACE; 421 422 p->flags &= ~(TERMP_SENTENCE | TERMP_NONEWLINE); 423 p->skipvsp = 0; 424 425 while ('\0' != *word) { 426 if ('\\' != *word) { 427 if (TERMP_NBRWORD & p->flags) { 428 if (' ' == *word) { 429 encode(p, nbrsp, 1); 430 word++; 431 continue; 432 } 433 ssz = strcspn(word, "\\ "); 434 } else 435 ssz = strcspn(word, "\\"); 436 encode(p, word, ssz); 437 word += (int)ssz; 438 continue; 439 } 440 441 word++; 442 esc = mandoc_escape(&word, &seq, &sz); 443 if (ESCAPE_ERROR == esc) 444 continue; 445 446 switch (esc) { 447 case ESCAPE_UNICODE: 448 uc = mchars_num2uc(seq + 1, sz - 1); 449 break; 450 case ESCAPE_NUMBERED: 451 uc = mchars_num2char(seq, sz); 452 if (uc < 0) 453 continue; 454 break; 455 case ESCAPE_SPECIAL: 456 if (p->enc == TERMENC_ASCII) { 457 cp = mchars_spec2str(seq, sz, &ssz); 458 if (cp != NULL) 459 encode(p, cp, ssz); 460 } else { 461 uc = mchars_spec2cp(seq, sz); 462 if (uc > 0) 463 encode1(p, uc); 464 } 465 continue; 466 case ESCAPE_FONTBOLD: 467 term_fontrepl(p, TERMFONT_BOLD); 468 continue; 469 case ESCAPE_FONTITALIC: 470 term_fontrepl(p, TERMFONT_UNDER); 471 continue; 472 case ESCAPE_FONTBI: 473 term_fontrepl(p, TERMFONT_BI); 474 continue; 475 case ESCAPE_FONT: 476 case ESCAPE_FONTROMAN: 477 term_fontrepl(p, TERMFONT_NONE); 478 continue; 479 case ESCAPE_FONTPREV: 480 term_fontlast(p); 481 continue; 482 case ESCAPE_NOSPACE: 483 if (p->flags & TERMP_BACKAFTER) 484 p->flags &= ~TERMP_BACKAFTER; 485 else if (*word == '\0') 486 p->flags |= (TERMP_NOSPACE | TERMP_NONEWLINE); 487 continue; 488 case ESCAPE_SKIPCHAR: 489 p->flags |= TERMP_BACKAFTER; 490 continue; 491 case ESCAPE_OVERSTRIKE: 492 cp = seq + sz; 493 while (seq < cp) { 494 if (*seq == '\\') { 495 mandoc_escape(&seq, NULL, NULL); 496 continue; 497 } 498 encode1(p, *seq++); 499 if (seq < cp) { 500 if (p->flags & TERMP_BACKBEFORE) 501 p->flags |= TERMP_BACKAFTER; 502 else 503 p->flags |= TERMP_BACKBEFORE; 504 } 505 } 506 /* Trim trailing backspace/blank pair. */ 507 if (p->col > 2 && 508 (p->buf[p->col - 1] == ' ' || 509 p->buf[p->col - 1] == '\t')) 510 p->col -= 2; 511 continue; 512 default: 513 continue; 514 } 515 516 /* 517 * Common handling for Unicode and numbered 518 * character escape sequences. 519 */ 520 521 if (p->enc == TERMENC_ASCII) { 522 cp = ascii_uc2str(uc); 523 encode(p, cp, strlen(cp)); 524 } else { 525 if ((uc < 0x20 && uc != 0x09) || 526 (uc > 0x7E && uc < 0xA0)) 527 uc = 0xFFFD; 528 encode1(p, uc); 529 } 530 } 531 p->flags &= ~TERMP_NBRWORD; 532 } 533 534 static void 535 adjbuf(struct termp *p, size_t sz) 536 { 537 538 if (0 == p->maxcols) 539 p->maxcols = 1024; 540 while (sz >= p->maxcols) 541 p->maxcols <<= 2; 542 543 p->buf = mandoc_reallocarray(p->buf, p->maxcols, sizeof(int)); 544 } 545 546 static void 547 bufferc(struct termp *p, char c) 548 { 549 550 if (p->col + 1 >= p->maxcols) 551 adjbuf(p, p->col + 1); 552 553 p->buf[p->col++] = c; 554 } 555 556 /* 557 * See encode(). 558 * Do this for a single (probably unicode) value. 559 * Does not check for non-decorated glyphs. 560 */ 561 static void 562 encode1(struct termp *p, int c) 563 { 564 enum termfont f; 565 566 if (p->col + 7 >= p->maxcols) 567 adjbuf(p, p->col + 7); 568 569 f = (c == ASCII_HYPH || c > 127 || isgraph(c)) ? 570 p->fontq[p->fonti] : TERMFONT_NONE; 571 572 if (p->flags & TERMP_BACKBEFORE) { 573 if (p->buf[p->col - 1] == ' ' || p->buf[p->col - 1] == '\t') 574 p->col--; 575 else 576 p->buf[p->col++] = 8; 577 p->flags &= ~TERMP_BACKBEFORE; 578 } 579 if (TERMFONT_UNDER == f || TERMFONT_BI == f) { 580 p->buf[p->col++] = '_'; 581 p->buf[p->col++] = 8; 582 } 583 if (TERMFONT_BOLD == f || TERMFONT_BI == f) { 584 if (ASCII_HYPH == c) 585 p->buf[p->col++] = '-'; 586 else 587 p->buf[p->col++] = c; 588 p->buf[p->col++] = 8; 589 } 590 p->buf[p->col++] = c; 591 if (p->flags & TERMP_BACKAFTER) { 592 p->flags |= TERMP_BACKBEFORE; 593 p->flags &= ~TERMP_BACKAFTER; 594 } 595 } 596 597 static void 598 encode(struct termp *p, const char *word, size_t sz) 599 { 600 size_t i; 601 602 if (p->col + 2 + (sz * 5) >= p->maxcols) 603 adjbuf(p, p->col + 2 + (sz * 5)); 604 605 for (i = 0; i < sz; i++) { 606 if (ASCII_HYPH == word[i] || 607 isgraph((unsigned char)word[i])) 608 encode1(p, word[i]); 609 else { 610 p->buf[p->col++] = word[i]; 611 612 /* 613 * Postpone the effect of \z while handling 614 * an overstrike sequence from ascii_uc2str(). 615 */ 616 617 if (word[i] == '\b' && 618 (p->flags & TERMP_BACKBEFORE)) { 619 p->flags &= ~TERMP_BACKBEFORE; 620 p->flags |= TERMP_BACKAFTER; 621 } 622 } 623 } 624 } 625 626 void 627 term_setwidth(struct termp *p, const char *wstr) 628 { 629 struct roffsu su; 630 int iop, width; 631 632 iop = 0; 633 width = 0; 634 if (NULL != wstr) { 635 switch (*wstr) { 636 case '+': 637 iop = 1; 638 wstr++; 639 break; 640 case '-': 641 iop = -1; 642 wstr++; 643 break; 644 default: 645 break; 646 } 647 if (a2roffsu(wstr, &su, SCALE_MAX)) 648 width = term_hspan(p, &su); 649 else 650 iop = 0; 651 } 652 (*p->setwidth)(p, iop, width); 653 } 654 655 size_t 656 term_len(const struct termp *p, size_t sz) 657 { 658 659 return (*p->width)(p, ' ') * sz; 660 } 661 662 static size_t 663 cond_width(const struct termp *p, int c, int *skip) 664 { 665 666 if (*skip) { 667 (*skip) = 0; 668 return 0; 669 } else 670 return (*p->width)(p, c); 671 } 672 673 size_t 674 term_strlen(const struct termp *p, const char *cp) 675 { 676 size_t sz, rsz, i; 677 int ssz, skip, uc; 678 const char *seq, *rhs; 679 enum mandoc_esc esc; 680 static const char rej[] = { '\\', ASCII_NBRSP, ASCII_HYPH, 681 ASCII_BREAK, '\0' }; 682 683 /* 684 * Account for escaped sequences within string length 685 * calculations. This follows the logic in term_word() as we 686 * must calculate the width of produced strings. 687 */ 688 689 sz = 0; 690 skip = 0; 691 while ('\0' != *cp) { 692 rsz = strcspn(cp, rej); 693 for (i = 0; i < rsz; i++) 694 sz += cond_width(p, *cp++, &skip); 695 696 switch (*cp) { 697 case '\\': 698 cp++; 699 esc = mandoc_escape(&cp, &seq, &ssz); 700 if (ESCAPE_ERROR == esc) 701 continue; 702 703 rhs = NULL; 704 705 switch (esc) { 706 case ESCAPE_UNICODE: 707 uc = mchars_num2uc(seq + 1, ssz - 1); 708 break; 709 case ESCAPE_NUMBERED: 710 uc = mchars_num2char(seq, ssz); 711 if (uc < 0) 712 continue; 713 break; 714 case ESCAPE_SPECIAL: 715 if (p->enc == TERMENC_ASCII) { 716 rhs = mchars_spec2str(seq, ssz, &rsz); 717 if (rhs != NULL) 718 break; 719 } else { 720 uc = mchars_spec2cp(seq, ssz); 721 if (uc > 0) 722 sz += cond_width(p, uc, &skip); 723 } 724 continue; 725 case ESCAPE_SKIPCHAR: 726 skip = 1; 727 continue; 728 case ESCAPE_OVERSTRIKE: 729 rsz = 0; 730 rhs = seq + ssz; 731 while (seq < rhs) { 732 if (*seq == '\\') { 733 mandoc_escape(&seq, NULL, NULL); 734 continue; 735 } 736 i = (*p->width)(p, *seq++); 737 if (rsz < i) 738 rsz = i; 739 } 740 sz += rsz; 741 continue; 742 default: 743 continue; 744 } 745 746 /* 747 * Common handling for Unicode and numbered 748 * character escape sequences. 749 */ 750 751 if (rhs == NULL) { 752 if (p->enc == TERMENC_ASCII) { 753 rhs = ascii_uc2str(uc); 754 rsz = strlen(rhs); 755 } else { 756 if ((uc < 0x20 && uc != 0x09) || 757 (uc > 0x7E && uc < 0xA0)) 758 uc = 0xFFFD; 759 sz += cond_width(p, uc, &skip); 760 continue; 761 } 762 } 763 764 if (skip) { 765 skip = 0; 766 break; 767 } 768 769 /* 770 * Common handling for all escape sequences 771 * printing more than one character. 772 */ 773 774 for (i = 0; i < rsz; i++) 775 sz += (*p->width)(p, *rhs++); 776 break; 777 case ASCII_NBRSP: 778 sz += cond_width(p, ' ', &skip); 779 cp++; 780 break; 781 case ASCII_HYPH: 782 sz += cond_width(p, '-', &skip); 783 cp++; 784 break; 785 default: 786 break; 787 } 788 } 789 790 return sz; 791 } 792 793 int 794 term_vspan(const struct termp *p, const struct roffsu *su) 795 { 796 double r; 797 int ri; 798 799 switch (su->unit) { 800 case SCALE_BU: 801 r = su->scale / 40.0; 802 break; 803 case SCALE_CM: 804 r = su->scale * 6.0 / 2.54; 805 break; 806 case SCALE_FS: 807 r = su->scale * 65536.0 / 40.0; 808 break; 809 case SCALE_IN: 810 r = su->scale * 6.0; 811 break; 812 case SCALE_MM: 813 r = su->scale * 0.006; 814 break; 815 case SCALE_PC: 816 r = su->scale; 817 break; 818 case SCALE_PT: 819 r = su->scale / 12.0; 820 break; 821 case SCALE_EN: 822 case SCALE_EM: 823 r = su->scale * 0.6; 824 break; 825 case SCALE_VS: 826 r = su->scale; 827 break; 828 default: 829 abort(); 830 } 831 ri = r > 0.0 ? r + 0.4995 : r - 0.4995; 832 return ri < 66 ? ri : 1; 833 } 834 835 /* 836 * Convert a scaling width to basic units, rounding down. 837 */ 838 int 839 term_hspan(const struct termp *p, const struct roffsu *su) 840 { 841 842 return (*p->hspan)(p, su); 843 } 844