tr.c

   1 /* built-in troff requests */
   2 #include <ctype.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include "roff.h"
   7
   8 static int tr_nl = 1;           /* just read a newline */
   9 static int c_pc = '%';          /* page number character */
  10 int c_ec = '\\';
  11 int c_cc = '.';
  12 int c_c2 = '\'';
  13
  14 /* skip everything until the end of line */
  15 static void jmp_eol(void)
  16 {
  17         int c;
  18         do {
  19                 c = cp_next();
  20         } while (c >= 0 && c != '\n');
  21 }
  22
  23 static void tr_vs(char **args)
  24 {
  25         int vs = args[1] ? eval_re(args[1], n_v, 'p') : n_v0;
  26         n_v0 = n_v;
  27         n_v = MAX(0, vs);
  28 }
  29
  30 static void tr_ls(char **args)
  31 {
  32         int ls = args[1] ? eval_re(args[1], n_L, 0) : n_L0;
  33         n_L0 = n_L;
  34         n_L = MAX(1, ls);
  35 }
  36
  37 static void tr_pl(char **args)
  38 {
  39         int n = eval_re(args[1] ? args[1] : "11i", n_p, 'v');
  40         n_p = MAX(0, n);
  41 }
  42
  43 static void tr_nr(char **args)
  44 {
  45         int id;
  46         if (!args[2])
  47                 return;
  48         id = map(args[1]);
  49         num_set(id, eval_re(args[2], num_get(id, 0), 'u'));
  50         num_inc(id, args[3] ? eval(args[3], 'u') : 0);
  51 }
  52
  53 static void tr_rr(char **args)
  54 {
  55         int i;
  56         for (i = 1; i <= NARGS; i++)
  57                 if (args[i])
  58                         num_del(map(args[i]));
  59 }
  60
  61 static void tr_af(char **args)
  62 {
  63         if (args[2])
  64                 num_setfmt(map(args[1]), args[2]);
  65 }
  66
  67 static void tr_ds(char **args)
  68 {
  69         if (args[2])
  70                 str_set(map(args[1]), args[2]);
  71 }
  72
  73 static void tr_as(char **args)
  74 {
  75         int reg;
  76         char *s1, *s2, *s;
  77         if (!args[2])
  78                 return;
  79         reg = map(args[1]);
  80         s1 = str_get(reg) ? str_get(reg) : "";
  81         s2 = args[2];
  82         s = xmalloc(strlen(s1) + strlen(s2) + 1);
  83         strcpy(s, s1);
  84         strcat(s, s2);
  85         str_set(reg, s);
  86         free(s);
  87 }
  88
  89 static void tr_rm(char **args)
  90 {
  91         int i;
  92         for (i = 1; i <= NARGS; i++)
  93                 if (args[i])
  94                         str_rm(map(args[i]));
  95 }
  96
  97 static void tr_rn(char **args)
  98 {
  99         if (!args[2])
 100                 return;
 101         str_rn(map(args[1]), map(args[2]));
 102 }
 103
 104 static void tr_po(char **args)
 105 {
 106         int po = args[1] ? eval_re(args[1], n_o, 'm') : n_o0;
 107         n_o0 = n_o;
 108         n_o = MAX(0, po);
 109 }
 110
 111 static void read_regname(char *s)
 112 {
 113         int c = cp_next();
 114         int n = n_cp ? 2 : NMLEN - 1;
 115         while (c == ' ' || c == '\t')
 116                 c = cp_next();
 117         while (c >= 0 && c != ' ' && c != '\t' && c != '\n' && --n >= 0) {
 118                 *s++ = c;
 119                 c = cp_next();
 120         }
 121         if (c >= 0)
 122                 cp_back(c);
 123         *s = '\0';
 124 }
 125
 126 static void macrobody(struct sbuf *sbuf, char *end)
 127 {
 128         char buf[NMLEN];
 129         int i, c;
 130         int first = 1;
 131         cp_back('\n');
 132         cp_copymode(1);
 133         while ((c = cp_next()) >= 0) {
 134                 if (sbuf && !first)
 135                         sbuf_add(sbuf, c);
 136                 first = 0;
 137                 if (c == '\n') {
 138                         if ((c = cp_next()) != '.') {
 139                                 cp_back(c);
 140                                 continue;
 141                         }
 142                         read_regname(buf);
 143                         if ((n_cp && end[0] == buf[0] && end[1] == buf[1]) ||
 144                                                 !strcmp(end, buf)) {
 145                                 jmp_eol();
 146                                 break;
 147                         }
 148                         if (sbuf) {
 149                                 sbuf_add(sbuf, '.');
 150                                 for (i = 0; buf[i]; i++)
 151                                         sbuf_add(sbuf, (unsigned char) buf[i]);
 152                         }
 153                 }
 154         }
 155         cp_copymode(0);
 156 }
 157
 158 static void tr_de(char **args)
 159 {
 160         struct sbuf sbuf;
 161         int id;
 162         if (!args[1])
 163                 return;
 164         id = map(args[1]);
 165         sbuf_init(&sbuf);
 166         if (args[0][1] == 'a' && args[0][2] == 'm' && str_get(id))
 167                 sbuf_append(&sbuf, str_get(id));
 168         macrobody(&sbuf, args[2] ? args[2] : ".");
 169         str_set(id, sbuf_buf(&sbuf));
 170         sbuf_done(&sbuf);
 171 }
 172
 173 static void tr_ig(char **args)
 174 {
 175         macrobody(NULL, args[1] ? args[1] : ".");
 176 }
 177
 178 /* read into sbuf until stop; if stop is NULL, stop at whitespace */
 179 static int read_until(struct sbuf *sbuf, char *stop,
 180                         int (*next)(void), void (*back)(int))
 181 {
 182         char cs[GNLEN], cs2[GNLEN];
 183         int c;
 184         while ((c = next()) >= 0) {
 185                 back(c);
 186                 if (c == '\n')
 187                         return 1;
 188                 if (!stop && (c == ' ' || c == '\t'))
 189                         return 0;
 190                 charnext(cs, next, back);
 191                 if (stop && !strcmp(stop, cs))
 192                         return 0;
 193                 charnext_str(cs2, cs);
 194                 sbuf_append(sbuf, cs2);
 195         }
 196         return 1;
 197 }
 198
 199 /* evaluate .if strcmp (i.e. 'str'str') */
 200 static int if_strcmp(int (*next)(void), void (*back)(int))
 201 {
 202         char delim[GNLEN];
 203         struct sbuf s1, s2;
 204         int ret;
 205         charnext(delim, next, back);
 206         sbuf_init(&s1);
 207         sbuf_init(&s2);
 208         read_until(&s1, delim, next, back);
 209         read_until(&s2, delim, next, back);
 210         ret = !strcmp(sbuf_buf(&s1), sbuf_buf(&s2));
 211         sbuf_done(&s1);
 212         sbuf_done(&s2);
 213         return ret;
 214 }
 215
 216 /* evaluate .if condition letters */
 217 static int if_cond(int (*next)(void), void (*back)(int))
 218 {
 219         switch (cp_next()) {
 220         case 'o':
 221                 return n_pg % 2;
 222         case 'e':
 223                 return !(n_pg % 2);
 224         case 't':
 225                 return 1;
 226         case 'n':
 227                 return 0;
 228         }
 229         return 0;
 230 }
 231
 232 /* evaluate .if condition */
 233 static int if_eval(int (*next)(void), void (*back)(int))
 234 {
 235         struct sbuf sbuf;
 236         int ret;
 237         sbuf_init(&sbuf);
 238         if (!read_until(&sbuf, NULL, next, back))
 239                 back(' ');
 240         ret = eval(sbuf_buf(&sbuf), '\0') > 0;
 241         sbuf_done(&sbuf);
 242         return ret;
 243 }
 244
 245 static int eval_if(int (*next)(void), void (*back)(int))
 246 {
 247         int neg = 0;
 248         int ret;
 249         int c;
 250         do {
 251                 c = next();
 252         } while (c == ' ' || c == '\t');
 253         if (c == '!') {
 254                 neg = 1;
 255                 c = next();
 256         }
 257         back(c);
 258         if (strchr("oetn", c)) {
 259                 ret = if_cond(next, back);
 260         } else if (!isdigit(c) && !strchr("-+*/%<=>&:.|()", c)) {
 261                 ret = if_strcmp(next, back);
 262         } else {
 263                 ret = if_eval(next, back);
 264         }
 265         return ret != neg;
 266 }
 267
 268 static int ie_cond[NIES];       /* .ie condition stack */
 269 static int ie_depth;
 270
 271 static void tr_if(char **args)
 272 {
 273         int c = eval_if(cp_next, cp_back);
 274         if (args[0][1] == 'i' && args[0][2] == 'e')     /* .ie command */
 275                 if (ie_depth < NIES)
 276                         ie_cond[ie_depth++] = c;
 277         cp_blk(!c);
 278 }
 279
 280 static void tr_el(char **args)
 281 {
 282         cp_blk(ie_depth > 0 ? ie_cond[--ie_depth] : 1);
 283 }
 284
 285 static void tr_na(char **args)
 286 {
 287         n_na = 1;
 288 }
 289
 290 static int adjmode(int c, int def)
 291 {
 292         switch (c) {
 293         case 'l':
 294                 return AD_L;
 295         case 'r':
 296                 return AD_R;
 297         case 'c':
 298                 return AD_C;
 299         case 'b':
 300         case 'n':
 301                 return AD_B;
 302         }
 303         return def;
 304 }
 305
 306 static void tr_ad(char **args)
 307 {
 308         char *s = args[1];
 309         n_na = 0;
 310         if (!s)
 311                 return;
 312         if (isdigit(s[0]))
 313                 n_j = atoi(s) & 15;
 314         else
 315                 n_j = s[0] == 'p' ? AD_P | adjmode(s[1], AD_B) : adjmode(s[0], n_j);
 316 }
 317
 318 static void tr_tm(char **args)
 319 {
 320         fprintf(stderr, "%s\n", args[1]);
 321 }
 322
 323 static void tr_so(char **args)
 324 {
 325         if (args[1])
 326                 in_so(args[1]);
 327 }
 328
 329 static void tr_nx(char **args)
 330 {
 331         in_nx(args[1]);
 332 }
 333
 334 static void tr_ex(char **args)
 335 {
 336         in_ex();
 337 }
 338
 339 static void tr_sy(char **args)
 340 {
 341         system(args[1]);
 342 }
 343
 344 static void tr_lt(char **args)
 345 {
 346         int lt = args[1] ? eval_re(args[1], n_lt, 'm') : n_t0;
 347         n_t0 = n_t0;
 348         n_lt = MAX(0, lt);
 349 }
 350
 351 static void tr_pc(char **args)
 352 {
 353         c_pc = args[1] ? args[1][0] : -1;
 354 }
 355
 356 static int tl_next(void)
 357 {
 358         int c = cp_next();
 359         if (c >= 0 && c == c_pc) {
 360                 in_push(num_str(map("%")), NULL);
 361                 c = cp_next();
 362         }
 363         return c;
 364 }
 365
 366 static void tr_tl(char **args)
 367 {
 368         int c;
 369         do {
 370                 c = cp_next();
 371         } while (c >= 0 && (c == ' ' || c == '\t'));
 372         cp_back(c);
 373         ren_tl(tl_next, cp_back);
 374         do {
 375                 c = cp_next();
 376         } while (c >= 0 && c != '\n');
 377 }
 378
 379 static void tr_ec(char **args)
 380 {
 381         c_ec = args[1] ? args[1][0] : '\\';
 382 }
 383
 384 static void tr_cc(char **args)
 385 {
 386         c_ec = args[1] ? args[1][0] : '.';
 387 }
 388
 389 static void tr_c2(char **args)
 390 {
 391         c_ec = args[1] ? args[1][0] : '\'';
 392 }
 393
 394 static void tr_eo(char **args)
 395 {
 396         c_ec = -1;
 397 }
 398
 399 static void tr_hc(char **args)
 400 {
 401         char *s = args[1];
 402         if (!s || charread(&s, c_hc) < 0)
 403                 strcpy(c_hc, "\\%");
 404 }
 405
 406 static void tr_nh(char **args)
 407 {
 408         n_hy = 0;
 409 }
 410
 411 static void tr_hy(char **args)
 412 {
 413         n_hy = args[1] ? atoi(args[1]) : 1;
 414 }
 415
 416 static void tr_hyp(char **args)
 417 {
 418         n_hyp = args[1] ? atoi(args[1]) : 1;
 419 }
 420
 421 static void tr_lg(char **args)
 422 {
 423         if (args[1])
 424                 n_lg = atoi(args[1]);
 425 }
 426
 427 static void tr_kn(char **args)
 428 {
 429         if (args[1])
 430                 n_kn = atoi(args[1]);
 431 }
 432
 433 static void tr_cp(char **args)
 434 {
 435         if (args[1])
 436                 n_cp = atoi(args[1]);
 437 }
 438
 439 static void tr_ss(char **args)
 440 {
 441         if (args[1]) {
 442                 n_ss = eval_re(args[1], n_ss, 0);
 443                 n_sss = args[2] ? eval_re(args[2], n_sss, 0) : n_ss;
 444         }
 445 }
 446
 447 static void tr_ssh(char **args)
 448 {
 449         n_ssh = args[1] ? eval_re(args[1], n_ssh, 0) : 0;
 450 }
 451
 452 static void tr_cs(char **args)
 453 {
 454         if (!args[1])
 455                 return;
 456         font_setcs(dev_font(dev_pos(args[1])), args[2] ? eval(args[2], 0) : 0);
 457 }
 458
 459 static void tr_ff(char **args)
 460 {
 461         struct font *fn;
 462         int i;
 463         if (!args[2])
 464                 return;
 465         fn = dev_font(dev_pos(args[1]));
 466         for (i = 2; i <= NARGS; i++)
 467                 if (fn && args[i] && args[i][0] && args[i][1])
 468                         font_feat(fn, args[i] + 1, args[i][0] == '+');
 469 }
 470
 471 static void tr_nm(char **args)
 472 {
 473         if (!args[1]) {
 474                 n_nm = 0;
 475                 return;
 476         }
 477         n_nm = 1;
 478         n_ln = eval_re(args[1], n_ln, 0);
 479         n_ln = MAX(0, n_ln);
 480         if (args[2] && isdigit(args[2][0]))
 481                 n_nM = MAX(1, eval(args[2], 0));
 482         if (args[3] && isdigit(args[3][0]))
 483                 n_nS = MAX(0, eval(args[3], 0));
 484         if (args[4] && isdigit(args[4][0]))
 485                 n_nI = MAX(0, eval(args[4], 0));
 486 }
 487
 488 static void tr_nn(char **args)
 489 {
 490         n_nn = args[1] ? eval(args[1], 0) : 1;
 491 }
 492
 493 static void tr_bd(char **args)
 494 {
 495         if (!args[1] || !strcmp("S", args[1]))
 496                 return;
 497         font_setbd(dev_font(dev_pos(args[1])), args[2] ? eval(args[2], 'u') : 0);
 498 }
 499
 500 static void tr_it(char **args)
 501 {
 502         if (args[2]) {
 503                 n_it = map(args[2]);
 504                 n_itn = eval(args[1], 0);
 505         } else {
 506                 n_it = 0;
 507         }
 508 }
 509
 510 static void tr_mc(char **args)
 511 {
 512         char *s = args[1];
 513         if (s && charread(&s, c_mc) >= 0) {
 514                 n_mc = 1;
 515                 n_mcn = args[2] ? eval(args[2], 'm') : SC_EM;
 516         } else {
 517                 n_mc = 0;
 518         }
 519 }
 520
 521 static void tr_tc(char **args)
 522 {
 523         char *s = args[1];
 524         if (!s || charread(&s, c_tc) < 0)
 525                 strcpy(c_tc, "");
 526 }
 527
 528 static void tr_lc(char **args)
 529 {
 530         char *s = args[1];
 531         if (!s || charread(&s, c_lc) < 0)
 532                 strcpy(c_lc, "");
 533 }
 534
 535 static void tr_lf(char **args)
 536 {
 537         if (args[1])
 538                 in_lf(args[2], eval(args[1], 0));
 539 }
 540
 541 static void tr_chop(char **args)
 542 {
 543         struct sbuf sbuf;
 544         int id;
 545         if (args[1])
 546                 in_lf(args[2], eval(args[1], 0));
 547         id = map(args[1]);
 548         if (str_get(id)) {
 549                 sbuf_init(&sbuf);
 550                 sbuf_append(&sbuf, str_get(id));
 551                 if (!sbuf_empty(&sbuf)) {
 552                         sbuf_cut(&sbuf, sbuf_len(&sbuf) - 1);
 553                         str_set(id, sbuf_buf(&sbuf));
 554                 }
 555                 sbuf_done(&sbuf);
 556         }
 557 }
 558
 559 /* character translation (.tr) */
 560 static struct dict cmap;                /* character mapping */
 561 static char cmap_src[NCMAPS][GNLEN];    /* source character */
 562 static char cmap_dst[NCMAPS][GNLEN];    /* character mapping */
 563 static int cmap_n;                      /* number of translated character */
 564
 565 void cmap_add(char *c1, char *c2)
 566 {
 567         int i = dict_get(&cmap, c1);
 568         if (i >= 0) {
 569                 strcpy(cmap_dst[i], c2);
 570         } else if (cmap_n < NCMAPS) {
 571                 strcpy(cmap_src[cmap_n], c1);
 572                 strcpy(cmap_dst[cmap_n], c2);
 573                 dict_put(&cmap, cmap_src[cmap_n], cmap_n);
 574                 cmap_n++;
 575         }
 576 }
 577
 578 char *cmap_map(char *c)
 579 {
 580         int i = dict_get(&cmap, c);
 581         return i >= 0 ? cmap_dst[i] : c;
 582 }
 583
 584 static void tr_tr(char **args)
 585 {
 586         char *s = args[1];
 587         char c1[GNLEN], c2[GNLEN];
 588         while (s && charread(&s, c1) >= 0) {
 589                 if (charread(&s, c2) < 0)
 590                         strcpy(c2, " ");
 591                 cmap_add(c1, c2);
 592         }
 593 }
 594
 595 /* character definition (.char) */
 596 static char cdef_src[NCDEFS][GNLEN];    /* source character */
 597 static char *cdef_dst[NCDEFS];          /* character definition */
 598 static int cdef_fn[NCDEFS];             /* owning font */
 599 static int cdef_n;                      /* number of defined characters */
 600 static int cdef_expanding;              /* inside cdef_expand() call */
 601
 602 static int cdef_find(char *c, int fn)
 603 {
 604         int i;
 605         for (i = 0; i < cdef_n; i++)
 606                 if ((!cdef_fn[i] || cdef_fn[i] == fn) && !strcmp(cdef_src[i], c))
 607                         return i;
 608         return -1;
 609 }
 610
 611 /* return the definition of the given character */
 612 char *cdef_map(char *c, int fn)
 613 {
 614         int i = cdef_find(c, fn);
 615         return !cdef_expanding && i >= 0 ? cdef_dst[i] : NULL;
 616 }
 617
 618 int cdef_expand(struct wb *wb, char *s, int fn)
 619 {
 620         char *d = cdef_map(s, fn);
 621         if (!d)
 622                 return 1;
 623         cdef_expanding = 1;
 624         ren_parse(wb, d);
 625         cdef_expanding = 0;
 626         return 0;
 627 }
 628
 629 static void cdef_add(char *fn, char *cs, char *def)
 630 {
 631         char c[GNLEN];
 632         int i;
 633         if (!def || charread(&cs, c) < 0)
 634                 return;
 635         i = cdef_find(c, -1);
 636         if (i < 0 && cdef_n < NCDEFS)
 637                 i = cdef_n++;
 638         if (i >= 0) {
 639                 strncpy(cdef_src[i], c, sizeof(cdef_src[i]) - 1);
 640                 cdef_dst[i] = xmalloc(strlen(def) + 1);
 641                 strcpy(cdef_dst[i], def);
 642                 cdef_fn[i] = fn ? dev_pos(fn) : 0;
 643         }
 644 }
 645
 646 static void cdef_remove(char *cs)
 647 {
 648         char c[GNLEN];
 649         int i;
 650         if (!cs || charread(&cs, c) < 0)
 651                 return;
 652         for (i = 0; i < cdef_n; i++) {
 653                 if (!strcmp(cdef_src[i], c)) {
 654                         free(cdef_dst[i]);
 655                         cdef_dst[i] = NULL;
 656                         cdef_src[i][0] = '\0';
 657                 }
 658         }
 659 }
 660
 661 static void tr_char(char **args)
 662 {
 663         cdef_add(NULL, args[1], args[2]);
 664 }
 665
 666 static void tr_rchar(char **args)
 667 {
 668         int i;
 669         for (i = 1; i <= NARGS; i++)
 670                 if (args[i])
 671                         cdef_remove(args[i]);
 672 }
 673
 674 static void tr_ochar(char **args)
 675 {
 676         cdef_add(args[1], args[2], args[3]);
 677 }
 678
 679 static void tr_fmap(char **args)
 680 {
 681         struct font *fn;
 682         if (!args[2])
 683                 return;
 684         fn = dev_font(dev_pos(args[1]));
 685         if (fn)
 686                 font_map(fn, args[2], args[3] ? font_glyph(fn, args[3]) : NULL);
 687 }
 688
 689 static void arg_regname(struct sbuf *sbuf)
 690 {
 691         char reg[NMLEN];
 692         read_regname(reg);
 693         sbuf_append(sbuf, reg);
 694         sbuf_add(sbuf, 0);
 695 }
 696
 697 static void arg_string(struct sbuf *sbuf)
 698 {
 699         int c;
 700         while ((c = cp_next()) == ' ')
 701                 ;
 702         if (c == '"')
 703                 c = cp_next();
 704         while (c > 0 && c != '\n') {
 705                 sbuf_add(sbuf, c);
 706                 c = cp_next();
 707         }
 708         sbuf_add(sbuf, 0);
 709         if (c >= 0)
 710                 cp_back(c);
 711 }
 712
 713 static int mkargs_arg(struct sbuf *sbuf, int (*next)(void), void (*back)(int))
 714 {
 715         int quoted = 0;
 716         int c;
 717         c = next();
 718         while (c == ' ')
 719                 c = next();
 720         if (c == '\n')
 721                 back(c);
 722         if (c < 0 || c == '\n')
 723                 return 1;
 724         if (c == '"') {
 725                 quoted = 1;
 726                 c = next();
 727         }
 728         while (c >= 0 && c != '\n') {
 729                 if (!quoted && c == ' ')
 730                         break;
 731                 if (quoted && c == '"') {
 732                         c = next();
 733                         if (c != '"')
 734                                 break;
 735                 }
 736                 sbuf_add(sbuf, c);
 737                 c = next();
 738         }
 739         sbuf_add(sbuf, 0);
 740         if (c >= 0)
 741                 back(c);
 742         return 0;
 743 }
 744
 745 /* read macro arguments */
 746 int tr_readargs(char **args, struct sbuf *sbuf, int (*next)(void), void (*back)(int))
 747 {
 748         int idx[NARGS];
 749         int i, n = 0;
 750         while (n < NARGS) {
 751                 idx[n] = sbuf_len(sbuf);
 752                 if (mkargs_arg(sbuf, next, back))
 753                         break;
 754                 n++;
 755         }
 756         for (i = 0; i < n; i++)
 757                 args[i] = sbuf_buf(sbuf) + idx[i];
 758         return n;
 759 }
 760
 761 /* read macro arguments; trims tabs if rmtabs is nonzero */
 762 static int mkargs(char **args, struct sbuf *sbuf)
 763 {
 764         int n = tr_readargs(args, sbuf, cp_next, cp_back);
 765         jmp_eol();
 766         return n;
 767 }
 768
 769 /* read request arguments; trims tabs too */
 770 static int mkargs_req(char **args, struct sbuf *sbuf)
 771 {
 772         int idx[NARGS];
 773         int i, n = 0;
 774         int c;
 775         c = cp_next();
 776         while (n < NARGS) {
 777                 idx[n] = sbuf_len(sbuf);
 778                 while (c == ' ' || c == '\t')
 779                         c = cp_next();
 780                 while (c >= 0 && c != '\n' && c != ' ' && c != '\t') {
 781                         sbuf_add(sbuf, c);
 782                         c = cp_next();
 783                 }
 784                 if (sbuf_len(sbuf) > idx[n])
 785                         n++;
 786                 sbuf_add(sbuf, 0);
 787                 if (c == '\n')
 788                         cp_back(c);
 789                 if (c < 0 || c == '\n')
 790                         break;
 791         }
 792         for (i = 0; i < n; i++)
 793                 args[i] = sbuf_buf(sbuf) + idx[i];
 794         jmp_eol();
 795         return n;
 796 }
 797
 798 /* read arguments for .ds */
 799 static int mkargs_ds(char **args, struct sbuf *sbuf)
 800 {
 801         int idx[NARGS];
 802         int i, n = 0;
 803         idx[n++] = sbuf_len(sbuf);
 804         arg_regname(sbuf);
 805         idx[n++] = sbuf_len(sbuf);
 806         cp_copymode(1);
 807         arg_string(sbuf);
 808         cp_copymode(0);
 809         jmp_eol();
 810         for (i = 0; i < n; i++)
 811                 args[i] = sbuf_buf(sbuf) + idx[i];
 812         return n;
 813 }
 814
 815 /* read arguments for commands .nr that expect a register name */
 816 static int mkargs_reg1(char **args, struct sbuf *sbuf)
 817 {
 818         int n;
 819         int idx0 = sbuf_len(sbuf);
 820         arg_regname(sbuf);
 821         n = mkargs_req(args + 1, sbuf) + 1;
 822         args[0] = sbuf_buf(sbuf) + idx0;
 823         return n;
 824 }
 825
 826 /* do not read arguments; for .if, .ie and .el */
 827 static int mkargs_null(char **args, struct sbuf *sbuf)
 828 {
 829         return 0;
 830 }
 831
 832 /* read the whole line for .tm */
 833 static int mkargs_eol(char **args, struct sbuf *sbuf)
 834 {
 835         int idx0 = sbuf_len(sbuf);
 836         int c;
 837         c = cp_next();
 838         while (c == ' ')
 839                 c = cp_next();
 840         while (c >= 0 && c != '\n') {
 841                 sbuf_add(sbuf, c);
 842                 c = cp_next();
 843         }
 844         args[0] = sbuf_buf(sbuf) + idx0;
 845         return 1;
 846 }
 847
 848 static struct cmd {
 849         char *id;
 850         void (*f)(char **args);
 851         int (*args)(char **args, struct sbuf *sbuf);
 852 } cmds[] = {
 853         {TR_DIVBEG, tr_divbeg},
 854         {TR_DIVEND, tr_divend},
 855         {TR_POPREN, tr_popren},
 856         {"ab", tr_ab, mkargs_eol},
 857         {"ad", tr_ad},
 858         {"af", tr_af},
 859         {"am", tr_de, mkargs_reg1},
 860         {"as", tr_as, mkargs_ds},
 861         {"bd", tr_bd},
 862         {"bp", tr_bp},
 863         {"br", tr_br},
 864         {"c2", tr_c2},
 865         {"cc", tr_cc},
 866         {"ochar", tr_ochar},
 867         {"ce", tr_ce},
 868         {"ch", tr_ch},
 869         {"char", tr_char, mkargs_ds},
 870         {"chop", tr_chop, mkargs_reg1},
 871         {"cl", tr_cl},
 872         {"cp", tr_cp},
 873         {"cs", tr_cs},
 874         {"da", tr_di},
 875         {"de", tr_de, mkargs_reg1},
 876         {"di", tr_di},
 877         {"ds", tr_ds, mkargs_ds},
 878         {"dt", tr_dt},
 879         {"ec", tr_ec},
 880         {"el", tr_el, mkargs_null},
 881         {"em", tr_em},
 882         {"eo", tr_eo},
 883         {"ev", tr_ev},
 884         {"ex", tr_ex},
 885         {"fc", tr_fc},
 886         {"ff", tr_ff},
 887         {"fi", tr_fi},
 888         {"fmap", tr_fmap},
 889         {"fp", tr_fp},
 890         {"fspecial", tr_fspecial},
 891         {"ft", tr_ft},
 892         {"hc", tr_hc},
 893         {"hcode", tr_hcode},
 894         {"hpf", tr_hpf},
 895         {"hpfa", tr_hpfa},
 896         {"hy", tr_hy},
 897         {"hyp", tr_hyp},
 898         {"hw", tr_hw},
 899         {"ie", tr_if, mkargs_null},
 900         {"if", tr_if, mkargs_null},
 901         {"ig", tr_ig},
 902         {"in", tr_in},
 903         {"it", tr_it},
 904         {"kn", tr_kn},
 905         {"lc", tr_lc},
 906         {"lf", tr_lf},
 907         {"lg", tr_lg},
 908         {"ll", tr_ll},
 909         {"ls", tr_ls},
 910         {"lt", tr_lt},
 911         {"mc", tr_mc},
 912         {"mk", tr_mk},
 913         {"na", tr_na},
 914         {"ne", tr_ne},
 915         {"nf", tr_nf},
 916         {"nh", tr_nh},
 917         {"nm", tr_nm},
 918         {"nn", tr_nn},
 919         {"nr", tr_nr, mkargs_reg1},
 920         {"ns", tr_ns},
 921         {"nx", tr_nx},
 922         {"os", tr_os},
 923         {"pc", tr_pc},
 924         {"pl", tr_pl},
 925         {"pn", tr_pn},
 926         {"po", tr_po},
 927         {"ps", tr_ps},
 928         {"rchar", tr_rchar, mkargs_ds},
 929         {"rm", tr_rm},
 930         {"rn", tr_rn},
 931         {"rr", tr_rr},
 932         {"rs", tr_rs},
 933         {"rt", tr_rt},
 934         {"so", tr_so},
 935         {"sp", tr_sp},
 936         {"ss", tr_ss},
 937         {"ssh", tr_ssh},
 938         {"sv", tr_sv},
 939         {"sy", tr_sy, mkargs_eol},
 940         {"ta", tr_ta},
 941         {"tc", tr_tc},
 942         {"ti", tr_ti},
 943         {"tl", tr_tl, mkargs_null},
 944         {"tm", tr_tm, mkargs_eol},
 945         {"tr", tr_tr, mkargs_eol},
 946         {"vs", tr_vs},
 947         {"wh", tr_wh},
 948 };
 949
 950 /* read the next troff request; return zero if a request was executed. */
 951 int tr_nextreq(void)
 952 {
 953         char *args[NARGS + 3] = {NULL};
 954         char cmd[RNLEN + 1];
 955         struct cmd *req;
 956         struct sbuf sbuf;
 957         int c;
 958         if (!tr_nl)
 959                 return 1;
 960         c = cp_next();
 961         if (c < 0 || (c != c_cc && c != c_c2)) {
 962                 cp_back(c);
 963                 return 1;
 964         }
 965         memset(args, 0, sizeof(args));
 966         args[0] = cmd;
 967         cmd[0] = c;
 968         req = NULL;
 969         cp_prefixblock(' ');
 970         read_regname(cmd + 1);
 971         sbuf_init(&sbuf);
 972         req = str_dget(map(cmd + 1));
 973         if (req) {
 974                 if (req->args)
 975                         req->args(args + 1, &sbuf);
 976                 else
 977                         mkargs_req(args + 1, &sbuf);
 978                 req->f(args);
 979         } else {
 980                 cp_copymode(1);
 981                 mkargs(args + 1, &sbuf);
 982                 cp_copymode(0);
 983                 if (str_get(map(cmd + 1)))
 984                         in_push(str_get(map(cmd + 1)), args + 1);
 985         }
 986         sbuf_done(&sbuf);
 987         return 0;
 988 }
 989
 990 int tr_next(void)
 991 {
 992         int c;
 993         while (!tr_nextreq())
 994                 ;
 995         c = cp_next();
 996         tr_nl = c == '\n' || c < 0;
 997         return c;
 998 }
 999
1000 void tr_init(void)
1001 {
1002         int i;
1003         for (i = 0; i < LEN(cmds); i++)
1004                 str_dset(map(cmds[i].id), &cmds[i]);
1005         dict_init(&cmap, NCMAPS, -1, 0, 0);
1006 }