1 /* $OpenBSD: term.c,v 1.118 2016/08/10 11:02:30 schwarze Exp $ */ 2 /* 3 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv> 4 * Copyright (c) 2010-2016 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 <sys/types.h> 19 20 #include <assert.h> 21 #include <ctype.h> 22 #include <stdio.h> 23 #include <stdlib.h> 24 #include <string.h> 25 26 #include "mandoc.h" 27 #include "mandoc_aux.h" 28 #include "out.h" 29 #include "term.h" 30 #include "main.h" 31 32 static size_t cond_width(const struct termp *, int, int *); 33 static void adjbuf(struct termp *p, size_t); 34 static void bufferc(struct termp *, char); 35 static void encode(struct termp *, const char *, size_t); 36 static void encode1(struct termp *, int); 37 38 39 void 40 term_free(struct termp *p) 41 { 42 43 free(p->buf); 44 free(p->fontq); 45 free(p); 46 } 47 48 void 49 term_begin(struct termp *p, term_margin head, 50 term_margin foot, const struct roff_meta *arg) 51 { 52 53 p->headf = head; 54 p->footf = foot; 55 p->argf = arg; 56 (*p->begin)(p); 57 } 58 59 void 60 term_end(struct termp *p) 61 { 62 63 (*p->end)(p); 64 } 65 66 /* 67 * Flush a chunk of text. By default, break the output line each time 68 * the right margin is reached, and continue output on the next line 69 * at the same offset as the chunk itself. By default, also break the 70 * output line at the end of the chunk. 71 * The following flags may be specified: 72 * 73 * - TERMP_NOBREAK: Do not break the output line at the right margin, 74 * but only at the max right margin. Also, do not break the output 75 * line at the end of the chunk, such that the next call can pad to 76 * the next column. However, if less than p->trailspace blanks, 77 * which can be 0, 1, or 2, remain to the right margin, the line 78 * will be broken. 79 * - TERMP_BRTRSP: Consider trailing whitespace significant 80 * when deciding whether the chunk fits or not. 81 * - TERMP_BRIND: If the chunk does not fit and the output line has 82 * to be broken, start the next line at the right margin instead 83 * of at the offset. Used together with TERMP_NOBREAK for the tags 84 * in various kinds of tagged lists. 85 * - TERMP_DANGLE: Do not break the output line at the right margin, 86 * append the next chunk after it even if this one is too long. 87 * To be used together with TERMP_NOBREAK. 88 * - TERMP_HANG: Like TERMP_DANGLE, and also suppress padding before 89 * the next chunk if this column is not full. 90 */ 91 void 92 term_flushln(struct termp *p) 93 { 94 size_t i; /* current input position in p->buf */ 95 int ntab; /* number of tabs to prepend */ 96 size_t vis; /* current visual position on output */ 97 size_t vbl; /* number of blanks to prepend to output */ 98 size_t vend; /* end of word visual position on output */ 99 size_t bp; /* visual right border position */ 100 size_t dv; /* temporary for visual pos calculations */ 101 size_t j; /* temporary loop index for p->buf */ 102 size_t jhy; /* last hyph before overflow w/r/t j */ 103 size_t maxvis; /* output position of visible boundary */ 104 105 /* 106 * First, establish the maximum columns of "visible" content. 107 * This is usually the difference between the right-margin and 108 * an indentation, but can be, for tagged lists or columns, a 109 * small set of values. 110 * 111 * The following unsigned-signed subtractions look strange, 112 * but they are actually correct. If the int p->overstep 113 * is negative, it gets sign extended. Subtracting that 114 * very large size_t effectively adds a small number to dv. 115 */ 116 dv = p->rmargin > p->offset ? p->rmargin - p->offset : 0; 117 maxvis = (int)dv > p->overstep ? dv - (size_t)p->overstep : 0; 118 119 if (p->flags & TERMP_NOBREAK) { 120 dv = p->maxrmargin > p->offset ? 121 p->maxrmargin - p->offset : 0; 122 bp = (int)dv > p->overstep ? 123 dv - (size_t)p->overstep : 0; 124 } else 125 bp = maxvis; 126 127 /* 128 * Calculate the required amount of padding. 129 */ 130 vbl = p->offset + p->overstep > p->viscol ? 131 p->offset + p->overstep - p->viscol : 0; 132 133 vis = vend = 0; 134 i = 0; 135 136 while (i < p->col) { 137 /* 138 * Handle literal tab characters: collapse all 139 * subsequent tabs into a single huge set of spaces. 140 */ 141 ntab = 0; 142 while (i < p->col && '\t' == p->buf[i]) { 143 vend = (vis / p->tabwidth + 1) * p->tabwidth; 144 vbl += vend - vis; 145 vis = vend; 146 ntab++; 147 i++; 148 } 149 150 /* 151 * Count up visible word characters. Control sequences 152 * (starting with the CSI) aren't counted. A space 153 * generates a non-printing word, which is valid (the 154 * space is printed according to regular spacing rules). 155 */ 156 157 for (j = i, jhy = 0; j < p->col; j++) { 158 if (' ' == p->buf[j] || '\t' == p->buf[j]) 159 break; 160 161 /* Back over the last printed character. */ 162 if (8 == p->buf[j]) { 163 assert(j); 164 vend -= (*p->width)(p, p->buf[j - 1]); 165 continue; 166 } 167 168 /* Regular word. */ 169 /* Break at the hyphen point if we overrun. */ 170 if (vend > vis && vend < bp && 171 (ASCII_HYPH == p->buf[j] || 172 ASCII_BREAK == p->buf[j])) 173 jhy = j; 174 175 /* 176 * Hyphenation now decided, put back a real 177 * hyphen such that we get the correct width. 178 */ 179 if (ASCII_HYPH == p->buf[j]) 180 p->buf[j] = '-'; 181 182 vend += (*p->width)(p, p->buf[j]); 183 } 184 185 /* 186 * Find out whether we would exceed the right margin. 187 * If so, break to the next line. 188 */ 189 if (vend > bp && 0 == jhy && vis > 0) { 190 vend -= vis; 191 (*p->endline)(p); 192 p->viscol = 0; 193 if (TERMP_BRIND & p->flags) { 194 vbl = p->rmargin; 195 vend += p->rmargin; 196 vend -= p->offset; 197 } else 198 vbl = p->offset; 199 200 /* use pending tabs on the new line */ 201 202 if (0 < ntab) 203 vbl += ntab * p->tabwidth; 204 205 /* 206 * Remove the p->overstep width. 207 * Again, if p->overstep is negative, 208 * sign extension does the right thing. 209 */ 210 211 bp += (size_t)p->overstep; 212 p->overstep = 0; 213 } 214 215 /* Write out the [remaining] word. */ 216 for ( ; i < p->col; i++) { 217 if (vend > bp && jhy > 0 && i > jhy) 218 break; 219 if ('\t' == p->buf[i]) 220 break; 221 if (' ' == p->buf[i]) { 222 j = i; 223 while (i < p->col && ' ' == p->buf[i]) 224 i++; 225 dv = (i - j) * (*p->width)(p, ' '); 226 vbl += dv; 227 vend += dv; 228 break; 229 } 230 if (ASCII_NBRSP == p->buf[i]) { 231 vbl += (*p->width)(p, ' '); 232 continue; 233 } 234 if (ASCII_BREAK == p->buf[i]) 235 continue; 236 237 /* 238 * Now we definitely know there will be 239 * printable characters to output, 240 * so write preceding white space now. 241 */ 242 if (vbl) { 243 (*p->advance)(p, vbl); 244 p->viscol += vbl; 245 vbl = 0; 246 } 247 248 (*p->letter)(p, p->buf[i]); 249 if (8 == p->buf[i]) 250 p->viscol -= (*p->width)(p, p->buf[i-1]); 251 else 252 p->viscol += (*p->width)(p, p->buf[i]); 253 } 254 vis = vend; 255 } 256 257 /* 258 * If there was trailing white space, it was not printed; 259 * so reset the cursor position accordingly. 260 */ 261 if (vis > vbl) 262 vis -= vbl; 263 else 264 vis = 0; 265 266 p->col = 0; 267 p->overstep = 0; 268 p->flags &= ~(TERMP_BACKAFTER | TERMP_BACKBEFORE); 269 270 if ( ! (TERMP_NOBREAK & p->flags)) { 271 p->viscol = 0; 272 (*p->endline)(p); 273 return; 274 } 275 276 if (TERMP_HANG & p->flags) { 277 p->overstep += (int)(p->offset + vis - p->rmargin + 278 p->trailspace * (*p->width)(p, ' ')); 279 280 /* 281 * If we have overstepped the margin, temporarily move 282 * it to the right and flag the rest of the line to be 283 * shorter. 284 * If there is a request to keep the columns together, 285 * allow negative overstep when the column is not full. 286 */ 287 if (p->trailspace && p->overstep < 0) 288 p->overstep = 0; 289 return; 290 291 } else if (TERMP_DANGLE & p->flags) 292 return; 293 294 /* Trailing whitespace is significant in some columns. */ 295 if (vis && vbl && (TERMP_BRTRSP & p->flags)) 296 vis += vbl; 297 298 /* If the column was overrun, break the line. */ 299 if (maxvis < vis + p->trailspace * (*p->width)(p, ' ')) { 300 (*p->endline)(p); 301 p->viscol = 0; 302 } 303 } 304 305 /* 306 * A newline only breaks an existing line; it won't assert vertical 307 * space. All data in the output buffer is flushed prior to the newline 308 * assertion. 309 */ 310 void 311 term_newln(struct termp *p) 312 { 313 314 p->flags |= TERMP_NOSPACE; 315 if (p->col || p->viscol) 316 term_flushln(p); 317 } 318 319 /* 320 * Asserts a vertical space (a full, empty line-break between lines). 321 * Note that if used twice, this will cause two blank spaces and so on. 322 * All data in the output buffer is flushed prior to the newline 323 * assertion. 324 */ 325 void 326 term_vspace(struct termp *p) 327 { 328 329 term_newln(p); 330 p->viscol = 0; 331 if (0 < p->skipvsp) 332 p->skipvsp--; 333 else 334 (*p->endline)(p); 335 } 336 337 /* Swap current and previous font; for \fP and .ft P */ 338 void 339 term_fontlast(struct termp *p) 340 { 341 enum termfont f; 342 343 f = p->fontl; 344 p->fontl = p->fontq[p->fonti]; 345 p->fontq[p->fonti] = f; 346 } 347 348 /* Set font, save current, discard previous; for \f, .ft, .B etc. */ 349 void 350 term_fontrepl(struct termp *p, enum termfont f) 351 { 352 353 p->fontl = p->fontq[p->fonti]; 354 p->fontq[p->fonti] = f; 355 } 356 357 /* Set font, save previous. */ 358 void 359 term_fontpush(struct termp *p, enum termfont f) 360 { 361 362 p->fontl = p->fontq[p->fonti]; 363 if (++p->fonti == p->fontsz) { 364 p->fontsz += 8; 365 p->fontq = mandoc_reallocarray(p->fontq, 366 p->fontsz, sizeof(*p->fontq)); 367 } 368 p->fontq[p->fonti] = f; 369 } 370 371 /* Flush to make the saved pointer current again. */ 372 void 373 term_fontpopq(struct termp *p, int i) 374 { 375 376 assert(i >= 0); 377 if (p->fonti > i) 378 p->fonti = i; 379 } 380 381 /* Pop one font off the stack. */ 382 void 383 term_fontpop(struct termp *p) 384 { 385 386 assert(p->fonti); 387 p->fonti--; 388 } 389 390 /* 391 * Handle pwords, partial words, which may be either a single word or a 392 * phrase that cannot be broken down (such as a literal string). This 393 * handles word styling. 394 */ 395 void 396 term_word(struct termp *p, const char *word) 397 { 398 const char nbrsp[2] = { ASCII_NBRSP, 0 }; 399 const char *seq, *cp; 400 int sz, uc; 401 size_t ssz; 402 enum mandoc_esc esc; 403 404 if ( ! (TERMP_NOSPACE & p->flags)) { 405 if ( ! (TERMP_KEEP & p->flags)) { 406 bufferc(p, ' '); 407 if (TERMP_SENTENCE & p->flags) 408 bufferc(p, ' '); 409 } else 410 bufferc(p, ASCII_NBRSP); 411 } 412 if (TERMP_PREKEEP & p->flags) 413 p->flags |= TERMP_KEEP; 414 415 if ( ! (p->flags & TERMP_NONOSPACE)) 416 p->flags &= ~TERMP_NOSPACE; 417 else 418 p->flags |= TERMP_NOSPACE; 419 420 p->flags &= ~(TERMP_SENTENCE | TERMP_NONEWLINE); 421 p->skipvsp = 0; 422 423 while ('\0' != *word) { 424 if ('\\' != *word) { 425 if (TERMP_NBRWORD & p->flags) { 426 if (' ' == *word) { 427 encode(p, nbrsp, 1); 428 word++; 429 continue; 430 } 431 ssz = strcspn(word, "\\ "); 432 } else 433 ssz = strcspn(word, "\\"); 434 encode(p, word, ssz); 435 word += (int)ssz; 436 continue; 437 } 438 439 word++; 440 esc = mandoc_escape(&word, &seq, &sz); 441 if (ESCAPE_ERROR == esc) 442 continue; 443 444 switch (esc) { 445 case ESCAPE_UNICODE: 446 uc = mchars_num2uc(seq + 1, sz - 1); 447 break; 448 case ESCAPE_NUMBERED: 449 uc = mchars_num2char(seq, sz); 450 if (uc < 0) 451 continue; 452 break; 453 case ESCAPE_SPECIAL: 454 if (p->enc == TERMENC_ASCII) { 455 cp = mchars_spec2str(seq, sz, &ssz); 456 if (cp != NULL) 457 encode(p, cp, ssz); 458 } else { 459 uc = mchars_spec2cp(seq, sz); 460 if (uc > 0) 461 encode1(p, uc); 462 } 463 continue; 464 case ESCAPE_FONTBOLD: 465 term_fontrepl(p, TERMFONT_BOLD); 466 continue; 467 case ESCAPE_FONTITALIC: 468 term_fontrepl(p, TERMFONT_UNDER); 469 continue; 470 case ESCAPE_FONTBI: 471 term_fontrepl(p, TERMFONT_BI); 472 continue; 473 case ESCAPE_FONT: 474 case ESCAPE_FONTROMAN: 475 term_fontrepl(p, TERMFONT_NONE); 476 continue; 477 case ESCAPE_FONTPREV: 478 term_fontlast(p); 479 continue; 480 case ESCAPE_NOSPACE: 481 if (p->flags & TERMP_BACKAFTER) 482 p->flags &= ~TERMP_BACKAFTER; 483 else if (*word == '\0') 484 p->flags |= (TERMP_NOSPACE | TERMP_NONEWLINE); 485 continue; 486 case ESCAPE_SKIPCHAR: 487 p->flags |= TERMP_BACKAFTER; 488 continue; 489 case ESCAPE_OVERSTRIKE: 490 cp = seq + sz; 491 while (seq < cp) { 492 if (*seq == '\\') { 493 mandoc_escape(&seq, NULL, NULL); 494 continue; 495 } 496 encode1(p, *seq++); 497 if (seq < cp) { 498 if (p->flags & TERMP_BACKBEFORE) 499 p->flags |= TERMP_BACKAFTER; 500 else 501 p->flags |= TERMP_BACKBEFORE; 502 } 503 } 504 /* Trim trailing backspace/blank pair. */ 505 if (p->col > 2 && 506 (p->buf[p->col - 1] == ' ' || 507 p->buf[p->col - 1] == '\t')) 508 p->col -= 2; 509 continue; 510 default: 511 continue; 512 } 513 514 /* 515 * Common handling for Unicode and numbered 516 * character escape sequences. 517 */ 518 519 if (p->enc == TERMENC_ASCII) { 520 cp = ascii_uc2str(uc); 521 encode(p, cp, strlen(cp)); 522 } else { 523 if ((uc < 0x20 && uc != 0x09) || 524 (uc > 0x7E && uc < 0xA0)) 525 uc = 0xFFFD; 526 encode1(p, uc); 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_reallocarray(p->buf, p->maxcols, sizeof(int)); 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 (p->col + 7 >= p->maxcols) 565 adjbuf(p, p->col + 7); 566 567 f = (c == ASCII_HYPH || c > 127 || isgraph(c)) ? 568 p->fontq[p->fonti] : TERMFONT_NONE; 569 570 if (p->flags & TERMP_BACKBEFORE) { 571 if (p->buf[p->col - 1] == ' ' || p->buf[p->col - 1] == '\t') 572 p->col--; 573 else 574 p->buf[p->col++] = 8; 575 p->flags &= ~TERMP_BACKBEFORE; 576 } 577 if (TERMFONT_UNDER == f || TERMFONT_BI == f) { 578 p->buf[p->col++] = '_'; 579 p->buf[p->col++] = 8; 580 } 581 if (TERMFONT_BOLD == f || TERMFONT_BI == f) { 582 if (ASCII_HYPH == c) 583 p->buf[p->col++] = '-'; 584 else 585 p->buf[p->col++] = c; 586 p->buf[p->col++] = 8; 587 } 588 p->buf[p->col++] = c; 589 if (p->flags & TERMP_BACKAFTER) { 590 p->flags |= TERMP_BACKBEFORE; 591 p->flags &= ~TERMP_BACKAFTER; 592 } 593 } 594 595 static void 596 encode(struct termp *p, const char *word, size_t sz) 597 { 598 size_t i; 599 600 if (p->col + 2 + (sz * 5) >= p->maxcols) 601 adjbuf(p, p->col + 2 + (sz * 5)); 602 603 for (i = 0; i < sz; i++) { 604 if (ASCII_HYPH == word[i] || 605 isgraph((unsigned char)word[i])) 606 encode1(p, word[i]); 607 else 608 p->buf[p->col++] = word[i]; 609 } 610 } 611 612 void 613 term_setwidth(struct termp *p, const char *wstr) 614 { 615 struct roffsu su; 616 int iop, width; 617 618 iop = 0; 619 width = 0; 620 if (NULL != wstr) { 621 switch (*wstr) { 622 case '+': 623 iop = 1; 624 wstr++; 625 break; 626 case '-': 627 iop = -1; 628 wstr++; 629 break; 630 default: 631 break; 632 } 633 if (a2roffsu(wstr, &su, SCALE_MAX)) 634 width = term_hspan(p, &su); 635 else 636 iop = 0; 637 } 638 (*p->setwidth)(p, iop, width); 639 } 640 641 size_t 642 term_len(const struct termp *p, size_t sz) 643 { 644 645 return (*p->width)(p, ' ') * sz; 646 } 647 648 static size_t 649 cond_width(const struct termp *p, int c, int *skip) 650 { 651 652 if (*skip) { 653 (*skip) = 0; 654 return 0; 655 } else 656 return (*p->width)(p, c); 657 } 658 659 size_t 660 term_strlen(const struct termp *p, const char *cp) 661 { 662 size_t sz, rsz, i; 663 int ssz, skip, uc; 664 const char *seq, *rhs; 665 enum mandoc_esc esc; 666 static const char rej[] = { '\\', ASCII_NBRSP, ASCII_HYPH, 667 ASCII_BREAK, '\0' }; 668 669 /* 670 * Account for escaped sequences within string length 671 * calculations. This follows the logic in term_word() as we 672 * must calculate the width of produced strings. 673 */ 674 675 sz = 0; 676 skip = 0; 677 while ('\0' != *cp) { 678 rsz = strcspn(cp, rej); 679 for (i = 0; i < rsz; i++) 680 sz += cond_width(p, *cp++, &skip); 681 682 switch (*cp) { 683 case '\\': 684 cp++; 685 esc = mandoc_escape(&cp, &seq, &ssz); 686 if (ESCAPE_ERROR == esc) 687 continue; 688 689 rhs = NULL; 690 691 switch (esc) { 692 case ESCAPE_UNICODE: 693 uc = mchars_num2uc(seq + 1, ssz - 1); 694 break; 695 case ESCAPE_NUMBERED: 696 uc = mchars_num2char(seq, ssz); 697 if (uc < 0) 698 continue; 699 break; 700 case ESCAPE_SPECIAL: 701 if (p->enc == TERMENC_ASCII) { 702 rhs = mchars_spec2str(seq, ssz, &rsz); 703 if (rhs != NULL) 704 break; 705 } else { 706 uc = mchars_spec2cp(seq, ssz); 707 if (uc > 0) 708 sz += cond_width(p, uc, &skip); 709 } 710 continue; 711 case ESCAPE_SKIPCHAR: 712 skip = 1; 713 continue; 714 case ESCAPE_OVERSTRIKE: 715 rsz = 0; 716 rhs = seq + ssz; 717 while (seq < rhs) { 718 if (*seq == '\\') { 719 mandoc_escape(&seq, NULL, NULL); 720 continue; 721 } 722 i = (*p->width)(p, *seq++); 723 if (rsz < i) 724 rsz = i; 725 } 726 sz += rsz; 727 continue; 728 default: 729 continue; 730 } 731 732 /* 733 * Common handling for Unicode and numbered 734 * character escape sequences. 735 */ 736 737 if (rhs == NULL) { 738 if (p->enc == TERMENC_ASCII) { 739 rhs = ascii_uc2str(uc); 740 rsz = strlen(rhs); 741 } else { 742 if ((uc < 0x20 && uc != 0x09) || 743 (uc > 0x7E && uc < 0xA0)) 744 uc = 0xFFFD; 745 sz += cond_width(p, uc, &skip); 746 continue; 747 } 748 } 749 750 if (skip) { 751 skip = 0; 752 break; 753 } 754 755 /* 756 * Common handling for all escape sequences 757 * printing more than one character. 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 break; 771 default: 772 break; 773 } 774 } 775 776 return sz; 777 } 778 779 int 780 term_vspan(const struct termp *p, const struct roffsu *su) 781 { 782 double r; 783 int ri; 784 785 switch (su->unit) { 786 case SCALE_BU: 787 r = su->scale / 40.0; 788 break; 789 case SCALE_CM: 790 r = su->scale * 6.0 / 2.54; 791 break; 792 case SCALE_FS: 793 r = su->scale * 65536.0 / 40.0; 794 break; 795 case SCALE_IN: 796 r = su->scale * 6.0; 797 break; 798 case SCALE_MM: 799 r = su->scale * 0.006; 800 break; 801 case SCALE_PC: 802 r = su->scale; 803 break; 804 case SCALE_PT: 805 r = su->scale / 12.0; 806 break; 807 case SCALE_EN: 808 case SCALE_EM: 809 r = su->scale * 0.6; 810 break; 811 case SCALE_VS: 812 r = su->scale; 813 break; 814 default: 815 abort(); 816 } 817 ri = r > 0.0 ? r + 0.4995 : r - 0.4995; 818 return ri < 66 ? ri : 1; 819 } 820 821 /* 822 * Convert a scaling width to basic units, rounding down. 823 */ 824 int 825 term_hspan(const struct termp *p, const struct roffsu *su) 826 { 827 828 return (*p->hspan)(p, su); 829 } 830