1 /* $OpenBSD: term.c,v 1.140 2019/01/15 12:15:52 schwarze Exp $ */ 2 /* 3 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv> 4 * Copyright (c) 2010-2019 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 <stdint.h> 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <string.h> 26 27 #include "mandoc.h" 28 #include "mandoc_aux.h" 29 #include "out.h" 30 #include "term.h" 31 #include "main.h" 32 33 static size_t cond_width(const struct termp *, int, int *); 34 static void adjbuf(struct termp_col *, size_t); 35 static void bufferc(struct termp *, char); 36 static void encode(struct termp *, const char *, size_t); 37 static void encode1(struct termp *, int); 38 static void endline(struct termp *); 39 static void term_field(struct termp *, size_t, size_t, 40 size_t, size_t); 41 static void term_fill(struct termp *, size_t *, size_t *, 42 size_t); 43 44 45 void 46 term_setcol(struct termp *p, size_t maxtcol) 47 { 48 if (maxtcol > p->maxtcol) { 49 p->tcols = mandoc_recallocarray(p->tcols, 50 p->maxtcol, maxtcol, sizeof(*p->tcols)); 51 p->maxtcol = maxtcol; 52 } 53 p->lasttcol = maxtcol - 1; 54 p->tcol = p->tcols; 55 } 56 57 void 58 term_free(struct termp *p) 59 { 60 for (p->tcol = p->tcols; p->tcol < p->tcols + p->maxtcol; p->tcol++) 61 free(p->tcol->buf); 62 free(p->tcols); 63 free(p->fontq); 64 free(p); 65 } 66 67 void 68 term_begin(struct termp *p, term_margin head, 69 term_margin foot, const struct roff_meta *arg) 70 { 71 72 p->headf = head; 73 p->footf = foot; 74 p->argf = arg; 75 (*p->begin)(p); 76 } 77 78 void 79 term_end(struct termp *p) 80 { 81 82 (*p->end)(p); 83 } 84 85 /* 86 * Flush a chunk of text. By default, break the output line each time 87 * the right margin is reached, and continue output on the next line 88 * at the same offset as the chunk itself. By default, also break the 89 * output line at the end of the chunk. There are many flags modifying 90 * this behaviour, see the comments in the body of the function. 91 */ 92 void 93 term_flushln(struct termp *p) 94 { 95 size_t vbl; /* Number of blanks to prepend to the output. */ 96 size_t vbr; /* Actual visual position of the end of field. */ 97 size_t vfield; /* Desired visual field width. */ 98 size_t vtarget; /* Desired visual position of the right margin. */ 99 size_t ic; /* Character position in the input buffer. */ 100 size_t nbr; /* Number of characters to print in this field. */ 101 102 /* 103 * Normally, start writing at the left margin, but with the 104 * NOPAD flag, start writing at the current position instead. 105 */ 106 107 vbl = (p->flags & TERMP_NOPAD) || p->tcol->offset < p->viscol ? 108 0 : p->tcol->offset - p->viscol; 109 if (p->minbl && vbl < p->minbl) 110 vbl = p->minbl; 111 112 if ((p->flags & TERMP_MULTICOL) == 0) 113 p->tcol->col = 0; 114 115 /* Loop over output lines. */ 116 117 for (;;) { 118 vfield = p->tcol->rmargin > p->viscol + vbl ? 119 p->tcol->rmargin - p->viscol - vbl : 0; 120 121 /* 122 * Normally, break the line at the the right margin 123 * of the field, but with the NOBREAK flag, only 124 * break it at the max right margin of the screen, 125 * and with the BRNEVER flag, never break it at all. 126 */ 127 128 vtarget = p->flags & TERMP_BRNEVER ? SIZE_MAX : 129 (p->flags & TERMP_NOBREAK) == 0 ? vfield : 130 p->maxrmargin > p->viscol + vbl ? 131 p->maxrmargin - p->viscol - vbl : 0; 132 133 /* 134 * Figure out how much text will fit in the field. 135 * If there is whitespace only, print nothing. 136 */ 137 138 term_fill(p, &nbr, &vbr, vtarget); 139 if (nbr == 0) 140 break; 141 142 /* 143 * With the CENTER or RIGHT flag, increase the indentation 144 * to center the text between the left and right margins 145 * or to adjust it to the right margin, respectively. 146 */ 147 148 if (vbr < vtarget) { 149 if (p->flags & TERMP_CENTER) 150 vbl += (vtarget - vbr) / 2; 151 else if (p->flags & TERMP_RIGHT) 152 vbl += vtarget - vbr; 153 } 154 155 /* Finally, print the field content. */ 156 157 term_field(p, vbl, nbr, vbr, vtarget); 158 159 /* 160 * If there is no text left in the field, exit the loop. 161 * If the BRTRSP flag is set, consider trailing 162 * whitespace significant when deciding whether 163 * the field fits or not. 164 */ 165 166 for (ic = p->tcol->col; ic < p->tcol->lastcol; ic++) { 167 switch (p->tcol->buf[ic]) { 168 case '\t': 169 if (p->flags & TERMP_BRTRSP) 170 vbr = term_tab_next(vbr); 171 continue; 172 case ' ': 173 if (p->flags & TERMP_BRTRSP) 174 vbr += (*p->width)(p, ' '); 175 continue; 176 case '\n': 177 case ASCII_BREAK: 178 continue; 179 default: 180 break; 181 } 182 break; 183 } 184 if (ic == p->tcol->lastcol) 185 break; 186 187 /* 188 * At the location of an automtic line break, input 189 * space characters are consumed by the line break. 190 */ 191 192 while (p->tcol->col < p->tcol->lastcol && 193 p->tcol->buf[p->tcol->col] == ' ') 194 p->tcol->col++; 195 196 /* 197 * In multi-column mode, leave the rest of the text 198 * in the buffer to be handled by a subsequent 199 * invocation, such that the other columns of the 200 * table can be handled first. 201 * In single-column mode, simply break the line. 202 */ 203 204 if (p->flags & TERMP_MULTICOL) 205 return; 206 207 endline(p); 208 p->viscol = 0; 209 210 /* 211 * Normally, start the next line at the same indentation 212 * as this one, but with the BRIND flag, start it at the 213 * right margin instead. This is used together with 214 * NOBREAK for the tags in various kinds of tagged lists. 215 */ 216 217 vbl = p->flags & TERMP_BRIND ? 218 p->tcol->rmargin : p->tcol->offset; 219 } 220 221 /* Reset output state in preparation for the next field. */ 222 223 p->col = p->tcol->col = p->tcol->lastcol = 0; 224 p->minbl = p->trailspace; 225 p->flags &= ~(TERMP_BACKAFTER | TERMP_BACKBEFORE | TERMP_NOPAD); 226 227 if (p->flags & TERMP_MULTICOL) 228 return; 229 230 /* 231 * The HANG flag means that the next field 232 * always follows on the same line. 233 * The NOBREAK flag means that the next field 234 * follows on the same line unless the field was overrun. 235 * Normally, break the line at the end of each field. 236 */ 237 238 if ((p->flags & TERMP_HANG) == 0 && 239 ((p->flags & TERMP_NOBREAK) == 0 || 240 vbr + term_len(p, p->trailspace) > vfield)) 241 endline(p); 242 } 243 244 /* 245 * Store the number of input characters to print in this field in *nbr 246 * and their total visual width to print in *vbr. 247 * If there is only whitespace in the field, both remain zero. 248 * The desired visual width of the field is provided by vtarget. 249 * If the first word is longer, the field will be overrun. 250 */ 251 static void 252 term_fill(struct termp *p, size_t *nbr, size_t *vbr, size_t vtarget) 253 { 254 size_t ic; /* Character position in the input buffer. */ 255 size_t vis; /* Visual position of the current character. */ 256 size_t vn; /* Visual position of the next character. */ 257 int breakline; /* Break at the end of this word. */ 258 int graph; /* Last character was non-blank. */ 259 260 *nbr = *vbr = vis = 0; 261 breakline = graph = 0; 262 for (ic = p->tcol->col; ic < p->tcol->lastcol; ic++) { 263 switch (p->tcol->buf[ic]) { 264 case '\b': /* Escape \o (overstrike) or backspace markup. */ 265 assert(ic > 0); 266 vis -= (*p->width)(p, p->tcol->buf[ic - 1]); 267 continue; 268 269 case '\t': /* Normal ASCII whitespace. */ 270 case ' ': 271 case ASCII_BREAK: /* Escape \: (breakpoint). */ 272 switch (p->tcol->buf[ic]) { 273 case '\t': 274 vn = term_tab_next(vis); 275 break; 276 case ' ': 277 vn = vis + (*p->width)(p, ' '); 278 break; 279 case ASCII_BREAK: 280 vn = vis; 281 break; 282 } 283 /* Can break at the end of a word. */ 284 if (breakline || vn > vtarget) 285 break; 286 if (graph) { 287 *nbr = ic; 288 *vbr = vis; 289 graph = 0; 290 } 291 vis = vn; 292 continue; 293 294 case '\n': /* Escape \p (break at the end of the word). */ 295 breakline = 1; 296 continue; 297 298 case ASCII_HYPH: /* Breakable hyphen. */ 299 graph = 1; 300 /* 301 * We are about to decide whether to break the 302 * line or not, so we no longer need this hyphen 303 * to be marked as breakable. Put back a real 304 * hyphen such that we get the correct width. 305 */ 306 p->tcol->buf[ic] = '-'; 307 vis += (*p->width)(p, '-'); 308 if (vis > vtarget) { 309 ic++; 310 break; 311 } 312 *nbr = ic + 1; 313 *vbr = vis; 314 continue; 315 316 case ASCII_NBRSP: /* Non-breakable space. */ 317 p->tcol->buf[ic] = ' '; 318 /* FALLTHROUGH */ 319 default: /* Printable character. */ 320 graph = 1; 321 vis += (*p->width)(p, p->tcol->buf[ic]); 322 if (vis > vtarget && *nbr > 0) 323 return; 324 continue; 325 } 326 break; 327 } 328 329 /* 330 * If the last word extends to the end of the field without any 331 * trailing whitespace, the loop could not check yet whether it 332 * can remain on this line. So do the check now. 333 */ 334 335 if (graph && (vis <= vtarget || *nbr == 0)) { 336 *nbr = ic; 337 *vbr = vis; 338 } 339 } 340 341 /* 342 * Print the contents of one field 343 * with an indentation of vbl visual columns, 344 * an input string length of nbr characters, 345 * an output width of vbr visual columns, 346 * and a desired field width of vtarget visual columns. 347 */ 348 static void 349 term_field(struct termp *p, size_t vbl, size_t nbr, size_t vbr, size_t vtarget) 350 { 351 size_t ic; /* Character position in the input buffer. */ 352 size_t vis; /* Visual position of the current character. */ 353 size_t dv; /* Visual width of the current character. */ 354 size_t vn; /* Visual position of the next character. */ 355 356 vis = 0; 357 for (ic = p->tcol->col; ic < nbr; ic++) { 358 359 /* 360 * To avoid the printing of trailing whitespace, 361 * do not print whitespace right away, only count it. 362 */ 363 364 switch (p->tcol->buf[ic]) { 365 case '\n': 366 case ASCII_BREAK: 367 continue; 368 case '\t': 369 vn = term_tab_next(vis); 370 vbl += vn - vis; 371 vis = vn; 372 continue; 373 case ' ': 374 case ASCII_NBRSP: 375 dv = (*p->width)(p, ' '); 376 vbl += dv; 377 vis += dv; 378 continue; 379 default: 380 break; 381 } 382 383 /* 384 * We found a non-blank character to print, 385 * so write preceding white space now. 386 */ 387 388 if (vbl > 0) { 389 (*p->advance)(p, vbl); 390 p->viscol += vbl; 391 vbl = 0; 392 } 393 394 /* Print the character and adjust the visual position. */ 395 396 (*p->letter)(p, p->tcol->buf[ic]); 397 if (p->tcol->buf[ic] == '\b') { 398 dv = (*p->width)(p, p->tcol->buf[ic - 1]); 399 p->viscol -= dv; 400 vis -= dv; 401 } else { 402 dv = (*p->width)(p, p->tcol->buf[ic]); 403 p->viscol += dv; 404 vis += dv; 405 } 406 } 407 p->tcol->col = nbr; 408 } 409 410 static void 411 endline(struct termp *p) 412 { 413 if ((p->flags & (TERMP_NEWMC | TERMP_ENDMC)) == TERMP_ENDMC) { 414 p->mc = NULL; 415 p->flags &= ~TERMP_ENDMC; 416 } 417 if (p->mc != NULL) { 418 if (p->viscol && p->maxrmargin >= p->viscol) 419 (*p->advance)(p, p->maxrmargin - p->viscol + 1); 420 p->flags |= TERMP_NOBUF | TERMP_NOSPACE; 421 term_word(p, p->mc); 422 p->flags &= ~(TERMP_NOBUF | TERMP_NEWMC); 423 } 424 p->viscol = 0; 425 p->minbl = 0; 426 (*p->endline)(p); 427 } 428 429 /* 430 * A newline only breaks an existing line; it won't assert vertical 431 * space. All data in the output buffer is flushed prior to the newline 432 * assertion. 433 */ 434 void 435 term_newln(struct termp *p) 436 { 437 438 p->flags |= TERMP_NOSPACE; 439 if (p->tcol->lastcol || p->viscol) 440 term_flushln(p); 441 } 442 443 /* 444 * Asserts a vertical space (a full, empty line-break between lines). 445 * Note that if used twice, this will cause two blank spaces and so on. 446 * All data in the output buffer is flushed prior to the newline 447 * assertion. 448 */ 449 void 450 term_vspace(struct termp *p) 451 { 452 453 term_newln(p); 454 p->viscol = 0; 455 p->minbl = 0; 456 if (0 < p->skipvsp) 457 p->skipvsp--; 458 else 459 (*p->endline)(p); 460 } 461 462 /* Swap current and previous font; for \fP and .ft P */ 463 void 464 term_fontlast(struct termp *p) 465 { 466 enum termfont f; 467 468 f = p->fontl; 469 p->fontl = p->fontq[p->fonti]; 470 p->fontq[p->fonti] = f; 471 } 472 473 /* Set font, save current, discard previous; for \f, .ft, .B etc. */ 474 void 475 term_fontrepl(struct termp *p, enum termfont f) 476 { 477 478 p->fontl = p->fontq[p->fonti]; 479 p->fontq[p->fonti] = f; 480 } 481 482 /* Set font, save previous. */ 483 void 484 term_fontpush(struct termp *p, enum termfont f) 485 { 486 487 p->fontl = p->fontq[p->fonti]; 488 if (++p->fonti == p->fontsz) { 489 p->fontsz += 8; 490 p->fontq = mandoc_reallocarray(p->fontq, 491 p->fontsz, sizeof(*p->fontq)); 492 } 493 p->fontq[p->fonti] = f; 494 } 495 496 /* Flush to make the saved pointer current again. */ 497 void 498 term_fontpopq(struct termp *p, int i) 499 { 500 501 assert(i >= 0); 502 if (p->fonti > i) 503 p->fonti = i; 504 } 505 506 /* Pop one font off the stack. */ 507 void 508 term_fontpop(struct termp *p) 509 { 510 511 assert(p->fonti); 512 p->fonti--; 513 } 514 515 /* 516 * Handle pwords, partial words, which may be either a single word or a 517 * phrase that cannot be broken down (such as a literal string). This 518 * handles word styling. 519 */ 520 void 521 term_word(struct termp *p, const char *word) 522 { 523 struct roffsu su; 524 const char nbrsp[2] = { ASCII_NBRSP, 0 }; 525 const char *seq, *cp; 526 int sz, uc; 527 size_t csz, lsz, ssz; 528 enum mandoc_esc esc; 529 530 if ((p->flags & TERMP_NOBUF) == 0) { 531 if ((p->flags & TERMP_NOSPACE) == 0) { 532 if ((p->flags & TERMP_KEEP) == 0) { 533 bufferc(p, ' '); 534 if (p->flags & TERMP_SENTENCE) 535 bufferc(p, ' '); 536 } else 537 bufferc(p, ASCII_NBRSP); 538 } 539 if (p->flags & TERMP_PREKEEP) 540 p->flags |= TERMP_KEEP; 541 if (p->flags & TERMP_NONOSPACE) 542 p->flags |= TERMP_NOSPACE; 543 else 544 p->flags &= ~TERMP_NOSPACE; 545 p->flags &= ~(TERMP_SENTENCE | TERMP_NONEWLINE); 546 p->skipvsp = 0; 547 } 548 549 while ('\0' != *word) { 550 if ('\\' != *word) { 551 if (TERMP_NBRWORD & p->flags) { 552 if (' ' == *word) { 553 encode(p, nbrsp, 1); 554 word++; 555 continue; 556 } 557 ssz = strcspn(word, "\\ "); 558 } else 559 ssz = strcspn(word, "\\"); 560 encode(p, word, ssz); 561 word += (int)ssz; 562 continue; 563 } 564 565 word++; 566 esc = mandoc_escape(&word, &seq, &sz); 567 switch (esc) { 568 case ESCAPE_UNICODE: 569 uc = mchars_num2uc(seq + 1, sz - 1); 570 break; 571 case ESCAPE_NUMBERED: 572 uc = mchars_num2char(seq, sz); 573 if (uc < 0) 574 continue; 575 break; 576 case ESCAPE_SPECIAL: 577 if (p->enc == TERMENC_ASCII) { 578 cp = mchars_spec2str(seq, sz, &ssz); 579 if (cp != NULL) 580 encode(p, cp, ssz); 581 } else { 582 uc = mchars_spec2cp(seq, sz); 583 if (uc > 0) 584 encode1(p, uc); 585 } 586 continue; 587 case ESCAPE_UNDEF: 588 uc = *seq; 589 break; 590 case ESCAPE_FONTBOLD: 591 term_fontrepl(p, TERMFONT_BOLD); 592 continue; 593 case ESCAPE_FONTITALIC: 594 term_fontrepl(p, TERMFONT_UNDER); 595 continue; 596 case ESCAPE_FONTBI: 597 term_fontrepl(p, TERMFONT_BI); 598 continue; 599 case ESCAPE_FONT: 600 case ESCAPE_FONTCW: 601 case ESCAPE_FONTROMAN: 602 term_fontrepl(p, TERMFONT_NONE); 603 continue; 604 case ESCAPE_FONTPREV: 605 term_fontlast(p); 606 continue; 607 case ESCAPE_BREAK: 608 bufferc(p, '\n'); 609 continue; 610 case ESCAPE_NOSPACE: 611 if (p->flags & TERMP_BACKAFTER) 612 p->flags &= ~TERMP_BACKAFTER; 613 else if (*word == '\0') 614 p->flags |= (TERMP_NOSPACE | TERMP_NONEWLINE); 615 continue; 616 case ESCAPE_DEVICE: 617 if (p->type == TERMTYPE_PDF) 618 encode(p, "pdf", 3); 619 else if (p->type == TERMTYPE_PS) 620 encode(p, "ps", 2); 621 else if (p->enc == TERMENC_ASCII) 622 encode(p, "ascii", 5); 623 else 624 encode(p, "utf8", 4); 625 continue; 626 case ESCAPE_HORIZ: 627 if (*seq == '|') { 628 seq++; 629 uc = -p->col; 630 } else 631 uc = 0; 632 if (a2roffsu(seq, &su, SCALE_EM) == NULL) 633 continue; 634 uc += term_hen(p, &su); 635 if (uc > 0) 636 while (uc-- > 0) 637 bufferc(p, ASCII_NBRSP); 638 else if (p->col > (size_t)(-uc)) 639 p->col += uc; 640 else { 641 uc += p->col; 642 p->col = 0; 643 if (p->tcol->offset > (size_t)(-uc)) { 644 p->ti += uc; 645 p->tcol->offset += uc; 646 } else { 647 p->ti -= p->tcol->offset; 648 p->tcol->offset = 0; 649 } 650 } 651 continue; 652 case ESCAPE_HLINE: 653 if ((cp = a2roffsu(seq, &su, SCALE_EM)) == NULL) 654 continue; 655 uc = term_hen(p, &su); 656 if (uc <= 0) { 657 if (p->tcol->rmargin <= p->tcol->offset) 658 continue; 659 lsz = p->tcol->rmargin - p->tcol->offset; 660 } else 661 lsz = uc; 662 if (*cp == seq[-1]) 663 uc = -1; 664 else if (*cp == '\\') { 665 seq = cp + 1; 666 esc = mandoc_escape(&seq, &cp, &sz); 667 switch (esc) { 668 case ESCAPE_UNICODE: 669 uc = mchars_num2uc(cp + 1, sz - 1); 670 break; 671 case ESCAPE_NUMBERED: 672 uc = mchars_num2char(cp, sz); 673 break; 674 case ESCAPE_SPECIAL: 675 uc = mchars_spec2cp(cp, sz); 676 break; 677 case ESCAPE_UNDEF: 678 uc = *seq; 679 break; 680 default: 681 uc = -1; 682 break; 683 } 684 } else 685 uc = *cp; 686 if (uc < 0x20 || (uc > 0x7E && uc < 0xA0)) 687 uc = '_'; 688 if (p->enc == TERMENC_ASCII) { 689 cp = ascii_uc2str(uc); 690 csz = term_strlen(p, cp); 691 ssz = strlen(cp); 692 } else 693 csz = (*p->width)(p, uc); 694 while (lsz >= csz) { 695 if (p->enc == TERMENC_ASCII) 696 encode(p, cp, ssz); 697 else 698 encode1(p, uc); 699 lsz -= csz; 700 } 701 continue; 702 case ESCAPE_SKIPCHAR: 703 p->flags |= TERMP_BACKAFTER; 704 continue; 705 case ESCAPE_OVERSTRIKE: 706 cp = seq + sz; 707 while (seq < cp) { 708 if (*seq == '\\') { 709 mandoc_escape(&seq, NULL, NULL); 710 continue; 711 } 712 encode1(p, *seq++); 713 if (seq < cp) { 714 if (p->flags & TERMP_BACKBEFORE) 715 p->flags |= TERMP_BACKAFTER; 716 else 717 p->flags |= TERMP_BACKBEFORE; 718 } 719 } 720 /* Trim trailing backspace/blank pair. */ 721 if (p->tcol->lastcol > 2 && 722 (p->tcol->buf[p->tcol->lastcol - 1] == ' ' || 723 p->tcol->buf[p->tcol->lastcol - 1] == '\t')) 724 p->tcol->lastcol -= 2; 725 if (p->col > p->tcol->lastcol) 726 p->col = p->tcol->lastcol; 727 continue; 728 default: 729 continue; 730 } 731 732 /* 733 * Common handling for Unicode and numbered 734 * character escape sequences. 735 */ 736 737 if (p->enc == TERMENC_ASCII) { 738 cp = ascii_uc2str(uc); 739 encode(p, cp, strlen(cp)); 740 } else { 741 if ((uc < 0x20 && uc != 0x09) || 742 (uc > 0x7E && uc < 0xA0)) 743 uc = 0xFFFD; 744 encode1(p, uc); 745 } 746 } 747 p->flags &= ~TERMP_NBRWORD; 748 } 749 750 static void 751 adjbuf(struct termp_col *c, size_t sz) 752 { 753 if (c->maxcols == 0) 754 c->maxcols = 1024; 755 while (c->maxcols <= sz) 756 c->maxcols <<= 2; 757 c->buf = mandoc_reallocarray(c->buf, c->maxcols, sizeof(*c->buf)); 758 } 759 760 static void 761 bufferc(struct termp *p, char c) 762 { 763 if (p->flags & TERMP_NOBUF) { 764 (*p->letter)(p, c); 765 return; 766 } 767 if (p->col + 1 >= p->tcol->maxcols) 768 adjbuf(p->tcol, p->col + 1); 769 if (p->tcol->lastcol <= p->col || (c != ' ' && c != ASCII_NBRSP)) 770 p->tcol->buf[p->col] = c; 771 if (p->tcol->lastcol < ++p->col) 772 p->tcol->lastcol = p->col; 773 } 774 775 /* 776 * See encode(). 777 * Do this for a single (probably unicode) value. 778 * Does not check for non-decorated glyphs. 779 */ 780 static void 781 encode1(struct termp *p, int c) 782 { 783 enum termfont f; 784 785 if (p->flags & TERMP_NOBUF) { 786 (*p->letter)(p, c); 787 return; 788 } 789 790 if (p->col + 7 >= p->tcol->maxcols) 791 adjbuf(p->tcol, p->col + 7); 792 793 f = (c == ASCII_HYPH || c > 127 || isgraph(c)) ? 794 p->fontq[p->fonti] : TERMFONT_NONE; 795 796 if (p->flags & TERMP_BACKBEFORE) { 797 if (p->tcol->buf[p->col - 1] == ' ' || 798 p->tcol->buf[p->col - 1] == '\t') 799 p->col--; 800 else 801 p->tcol->buf[p->col++] = '\b'; 802 p->flags &= ~TERMP_BACKBEFORE; 803 } 804 if (f == TERMFONT_UNDER || f == TERMFONT_BI) { 805 p->tcol->buf[p->col++] = '_'; 806 p->tcol->buf[p->col++] = '\b'; 807 } 808 if (f == TERMFONT_BOLD || f == TERMFONT_BI) { 809 if (c == ASCII_HYPH) 810 p->tcol->buf[p->col++] = '-'; 811 else 812 p->tcol->buf[p->col++] = c; 813 p->tcol->buf[p->col++] = '\b'; 814 } 815 if (p->tcol->lastcol <= p->col || (c != ' ' && c != ASCII_NBRSP)) 816 p->tcol->buf[p->col] = c; 817 if (p->tcol->lastcol < ++p->col) 818 p->tcol->lastcol = p->col; 819 if (p->flags & TERMP_BACKAFTER) { 820 p->flags |= TERMP_BACKBEFORE; 821 p->flags &= ~TERMP_BACKAFTER; 822 } 823 } 824 825 static void 826 encode(struct termp *p, const char *word, size_t sz) 827 { 828 size_t i; 829 830 if (p->flags & TERMP_NOBUF) { 831 for (i = 0; i < sz; i++) 832 (*p->letter)(p, word[i]); 833 return; 834 } 835 836 if (p->col + 2 + (sz * 5) >= p->tcol->maxcols) 837 adjbuf(p->tcol, p->col + 2 + (sz * 5)); 838 839 for (i = 0; i < sz; i++) { 840 if (ASCII_HYPH == word[i] || 841 isgraph((unsigned char)word[i])) 842 encode1(p, word[i]); 843 else { 844 if (p->tcol->lastcol <= p->col || 845 (word[i] != ' ' && word[i] != ASCII_NBRSP)) 846 p->tcol->buf[p->col] = word[i]; 847 p->col++; 848 849 /* 850 * Postpone the effect of \z while handling 851 * an overstrike sequence from ascii_uc2str(). 852 */ 853 854 if (word[i] == '\b' && 855 (p->flags & TERMP_BACKBEFORE)) { 856 p->flags &= ~TERMP_BACKBEFORE; 857 p->flags |= TERMP_BACKAFTER; 858 } 859 } 860 } 861 if (p->tcol->lastcol < p->col) 862 p->tcol->lastcol = p->col; 863 } 864 865 void 866 term_setwidth(struct termp *p, const char *wstr) 867 { 868 struct roffsu su; 869 int iop, width; 870 871 iop = 0; 872 width = 0; 873 if (NULL != wstr) { 874 switch (*wstr) { 875 case '+': 876 iop = 1; 877 wstr++; 878 break; 879 case '-': 880 iop = -1; 881 wstr++; 882 break; 883 default: 884 break; 885 } 886 if (a2roffsu(wstr, &su, SCALE_MAX) != NULL) 887 width = term_hspan(p, &su); 888 else 889 iop = 0; 890 } 891 (*p->setwidth)(p, iop, width); 892 } 893 894 size_t 895 term_len(const struct termp *p, size_t sz) 896 { 897 898 return (*p->width)(p, ' ') * sz; 899 } 900 901 static size_t 902 cond_width(const struct termp *p, int c, int *skip) 903 { 904 905 if (*skip) { 906 (*skip) = 0; 907 return 0; 908 } else 909 return (*p->width)(p, c); 910 } 911 912 size_t 913 term_strlen(const struct termp *p, const char *cp) 914 { 915 size_t sz, rsz, i; 916 int ssz, skip, uc; 917 const char *seq, *rhs; 918 enum mandoc_esc esc; 919 static const char rej[] = { '\\', ASCII_NBRSP, ASCII_HYPH, 920 ASCII_BREAK, '\0' }; 921 922 /* 923 * Account for escaped sequences within string length 924 * calculations. This follows the logic in term_word() as we 925 * must calculate the width of produced strings. 926 */ 927 928 sz = 0; 929 skip = 0; 930 while ('\0' != *cp) { 931 rsz = strcspn(cp, rej); 932 for (i = 0; i < rsz; i++) 933 sz += cond_width(p, *cp++, &skip); 934 935 switch (*cp) { 936 case '\\': 937 cp++; 938 rhs = NULL; 939 esc = mandoc_escape(&cp, &seq, &ssz); 940 switch (esc) { 941 case ESCAPE_UNICODE: 942 uc = mchars_num2uc(seq + 1, ssz - 1); 943 break; 944 case ESCAPE_NUMBERED: 945 uc = mchars_num2char(seq, ssz); 946 if (uc < 0) 947 continue; 948 break; 949 case ESCAPE_SPECIAL: 950 if (p->enc == TERMENC_ASCII) { 951 rhs = mchars_spec2str(seq, ssz, &rsz); 952 if (rhs != NULL) 953 break; 954 } else { 955 uc = mchars_spec2cp(seq, ssz); 956 if (uc > 0) 957 sz += cond_width(p, uc, &skip); 958 } 959 continue; 960 case ESCAPE_UNDEF: 961 uc = *seq; 962 break; 963 case ESCAPE_DEVICE: 964 if (p->type == TERMTYPE_PDF) { 965 rhs = "pdf"; 966 rsz = 3; 967 } else if (p->type == TERMTYPE_PS) { 968 rhs = "ps"; 969 rsz = 2; 970 } else if (p->enc == TERMENC_ASCII) { 971 rhs = "ascii"; 972 rsz = 5; 973 } else { 974 rhs = "utf8"; 975 rsz = 4; 976 } 977 break; 978 case ESCAPE_SKIPCHAR: 979 skip = 1; 980 continue; 981 case ESCAPE_OVERSTRIKE: 982 rsz = 0; 983 rhs = seq + ssz; 984 while (seq < rhs) { 985 if (*seq == '\\') { 986 mandoc_escape(&seq, NULL, NULL); 987 continue; 988 } 989 i = (*p->width)(p, *seq++); 990 if (rsz < i) 991 rsz = i; 992 } 993 sz += rsz; 994 continue; 995 default: 996 continue; 997 } 998 999 /* 1000 * Common handling for Unicode and numbered 1001 * character escape sequences. 1002 */ 1003 1004 if (rhs == NULL) { 1005 if (p->enc == TERMENC_ASCII) { 1006 rhs = ascii_uc2str(uc); 1007 rsz = strlen(rhs); 1008 } else { 1009 if ((uc < 0x20 && uc != 0x09) || 1010 (uc > 0x7E && uc < 0xA0)) 1011 uc = 0xFFFD; 1012 sz += cond_width(p, uc, &skip); 1013 continue; 1014 } 1015 } 1016 1017 if (skip) { 1018 skip = 0; 1019 break; 1020 } 1021 1022 /* 1023 * Common handling for all escape sequences 1024 * printing more than one character. 1025 */ 1026 1027 for (i = 0; i < rsz; i++) 1028 sz += (*p->width)(p, *rhs++); 1029 break; 1030 case ASCII_NBRSP: 1031 sz += cond_width(p, ' ', &skip); 1032 cp++; 1033 break; 1034 case ASCII_HYPH: 1035 sz += cond_width(p, '-', &skip); 1036 cp++; 1037 break; 1038 default: 1039 break; 1040 } 1041 } 1042 1043 return sz; 1044 } 1045 1046 int 1047 term_vspan(const struct termp *p, const struct roffsu *su) 1048 { 1049 double r; 1050 int ri; 1051 1052 switch (su->unit) { 1053 case SCALE_BU: 1054 r = su->scale / 40.0; 1055 break; 1056 case SCALE_CM: 1057 r = su->scale * 6.0 / 2.54; 1058 break; 1059 case SCALE_FS: 1060 r = su->scale * 65536.0 / 40.0; 1061 break; 1062 case SCALE_IN: 1063 r = su->scale * 6.0; 1064 break; 1065 case SCALE_MM: 1066 r = su->scale * 0.006; 1067 break; 1068 case SCALE_PC: 1069 r = su->scale; 1070 break; 1071 case SCALE_PT: 1072 r = su->scale / 12.0; 1073 break; 1074 case SCALE_EN: 1075 case SCALE_EM: 1076 r = su->scale * 0.6; 1077 break; 1078 case SCALE_VS: 1079 r = su->scale; 1080 break; 1081 default: 1082 abort(); 1083 } 1084 ri = r > 0.0 ? r + 0.4995 : r - 0.4995; 1085 return ri < 66 ? ri : 1; 1086 } 1087 1088 /* 1089 * Convert a scaling width to basic units, rounding towards 0. 1090 */ 1091 int 1092 term_hspan(const struct termp *p, const struct roffsu *su) 1093 { 1094 1095 return (*p->hspan)(p, su); 1096 } 1097 1098 /* 1099 * Convert a scaling width to basic units, rounding to closest. 1100 */ 1101 int 1102 term_hen(const struct termp *p, const struct roffsu *su) 1103 { 1104 int bu; 1105 1106 if ((bu = (*p->hspan)(p, su)) >= 0) 1107 return (bu + 11) / 24; 1108 else 1109 return -((-bu + 11) / 24); 1110 } 1111