tr.c

   1 #include <ctype.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include "roff.h"
   6
   7 static int tr_nl = 1;
   8 static int c_pc = '%';          /* page number character */
   9 int c_ec = '\\';
  10 int c_cc = '.';
  11 int c_c2 = '\'';
  12
  13 /* skip everything until the end of line */
  14 static void jmp_eol(void)
  15 {
  16         int c;
  17         do {
  18                 c = cp_next();
  19         } while (c >= 0 && c != '\n');
  20 }
  21
  22 static void tr_vs(char **args)
  23 {
  24         int vs = args[1] ? eval_re(args[1], n_v, 'p') : n_v0;
  25         n_v0 = n_v;
  26         n_v = MAX(0, vs);
  27 }
  28
  29 static void tr_ls(char **args)
  30 {
  31         int ls = args[1] ? eval_re(args[1], n_L, 0) : n_L0;
  32         n_L0 = n_L;
  33         n_L = MAX(1, ls);
  34 }
  35
  36 static void tr_pl(char **args)
  37 {
  38         int n = eval_re(args[1] ? args[1] : "11i", n_p, 'v');
  39         n_p = MAX(0, n);
  40 }
  41
  42 static void tr_nr(char **args)
  43 {
  44         int id;
  45         if (!args[2])
  46                 return;
  47         id = map(args[1]);
  48         num_set(id, eval_re(args[2], num_get(id, 0), 'u'));
  49         num_inc(id, args[3] ? eval(args[3], 'u') : 0);
  50 }
  51
  52 static void tr_rr(char **args)
  53 {
  54         int i;
  55         for (i = 1; i <= NARGS; i++)
  56                 if (args[i])
  57                         num_del(map(args[i]));
  58 }
  59
  60 static void tr_af(char **args)
  61 {
  62         if (args[2])
  63                 num_setfmt(map(args[1]), args[2]);
  64 }
  65
  66 static void tr_ds(char **args)
  67 {
  68         if (args[2])
  69                 str_set(map(args[1]), args[2]);
  70 }
  71
  72 static void tr_as(char **args)
  73 {
  74         int reg;
  75         char *s1, *s2, *s;
  76         if (!args[2])
  77                 return;
  78         reg = map(args[1]);
  79         s1 = str_get(reg) ? str_get(reg) : "";
  80         s2 = args[2];
  81         s = malloc(strlen(s1) + strlen(s2) + 1);
  82         strcpy(s, s1);
  83         strcat(s, s2);
  84         str_set(reg, s);
  85         free(s);
  86 }
  87
  88 static void tr_rm(char **args)
  89 {
  90         int i;
  91         for (i = 1; i <= NARGS; i++)
  92                 if (args[i])
  93                         str_rm(map(args[i]));
  94 }
  95
  96 static void tr_rn(char **args)
  97 {
  98         if (!args[2])
  99                 return;
 100         str_rn(map(args[1]), map(args[2]));
 101 }
 102
 103 static void tr_po(char **args)
 104 {
 105         int po = args[1] ? eval_re(args[1], n_o, 'm') : n_o0;
 106         n_o0 = n_o;
 107         n_o = MAX(0, po);
 108 }
 109
 110 static char *arg_regname(char *s, int len);
 111
 112 static void macrobody(struct sbuf *sbuf, char *end)
 113 {
 114         char buf[NMLEN];
 115         int i, c;
 116         int first = 1;
 117         cp_back('\n');
 118         cp_wid(0);              /* copy-mode; disable \w handling */
 119         while ((c = cp_next()) >= 0) {
 120                 if (sbuf && !first)
 121                         sbuf_add(sbuf, c);
 122                 first = 0;
 123                 if (c == '\n') {
 124                         c = cp_next();
 125                         if (c == '.') {
 126                                 arg_regname(buf, sizeof(buf));
 127                                 if ((n_cp && end[0] == buf[0] && end[1] == buf[1]) ||
 128                                                         !strcmp(end, buf)) {
 129                                         jmp_eol();
 130                                         break;
 131                                 }
 132                                 if (!sbuf)
 133                                         continue;
 134                                 sbuf_add(sbuf, '.');
 135                                 for (i = 0; buf[i]; i++)
 136                                         sbuf_add(sbuf, (unsigned char) buf[i]);
 137                                 continue;
 138                         }
 139                         if (sbuf && c >= 0)
 140                                 sbuf_add(sbuf, c);
 141                 }
 142         }
 143         cp_wid(1);
 144 }
 145
 146 static void tr_de(char **args)
 147 {
 148         struct sbuf sbuf;
 149         int id;
 150         if (!args[1])
 151                 return;
 152         id = map(args[1]);
 153         sbuf_init(&sbuf);
 154         if (args[0][1] == 'a' && args[0][2] == 'm' && str_get(id))
 155                 sbuf_append(&sbuf, str_get(id));
 156         macrobody(&sbuf, args[2] ? args[2] : ".");
 157         str_set(id, sbuf_buf(&sbuf));
 158         sbuf_done(&sbuf);
 159 }
 160
 161 static void tr_ig(char **args)
 162 {
 163         macrobody(NULL, args[1] ? args[1] : ".");
 164 }
 165
 166 void schar_read(char *d, int (*next)(void))
 167 {
 168         d[0] = next();
 169         d[1] = '\0';
 170         if (d[0] == c_ni) {
 171                 d[1] = next();
 172                 d[2] = '\0';
 173         }
 174         if (d[0] == c_ec) {
 175                 d[1] = next();
 176                 d[2] = '\0';
 177                 if (d[1] == '(') {
 178                         d[2] = next();
 179                         d[3] = next();
 180                         d[4] = '\0';
 181                 }
 182         }
 183 }
 184
 185 int schar_jump(char *d, int (*next)(void), void (*back)(int))
 186 {
 187         int c, i;
 188         for (i = 0; d[i]; i++)
 189                 if ((c = next()) != d[i])
 190                         break;
 191         if (d[i]) {
 192                 back(c);
 193                 while (i > 0)
 194                         back(d[--i]);
 195                 return 1;
 196         }
 197         return 0;
 198 }
 199
 200 /* read into sbuf until stop; if stop is NULL, stop at whitespace */
 201 static int read_until(struct sbuf *sbuf, char *stop)
 202 {
 203         int c;
 204         while ((c = cp_next()) >= 0) {
 205                 cp_back(c);
 206                 if (c == '\n')
 207                         return 1;
 208                 if (!stop && (c == ' ' || c == '\t'))
 209                         return 0;
 210                 if (stop && !schar_jump(stop, cp_next, cp_back))
 211                         return 0;
 212                 sbuf_add(sbuf, cp_next());
 213         }
 214         return 1;
 215 }
 216
 217 /* evaluate .if strcmp (i.e. 'str'str') */
 218 static int if_strcmp(void)
 219 {
 220         char delim[GNLEN];
 221         struct sbuf s1, s2;
 222         int ret;
 223         schar_read(delim, cp_next);
 224         sbuf_init(&s1);
 225         sbuf_init(&s2);
 226         read_until(&s1, delim);
 227         read_until(&s2, delim);
 228         ret = !strcmp(sbuf_buf(&s1), sbuf_buf(&s2));
 229         sbuf_done(&s1);
 230         sbuf_done(&s2);
 231         return ret;
 232 }
 233
 234 /* evaluate .if condition letters */
 235 static int if_cond(void)
 236 {
 237         switch (cp_next()) {
 238         case 'o':
 239                 return n_pg % 2;
 240         case 'e':
 241                 return !(n_pg % 2);
 242         case 't':
 243                 return 1;
 244         case 'n':
 245                 return 0;
 246         }
 247         return 0;
 248 }
 249
 250 /* evaluate .if condition */
 251 static int if_eval(void)
 252 {
 253         struct sbuf sbuf;
 254         int ret;
 255         sbuf_init(&sbuf);
 256         if (!read_until(&sbuf, NULL))
 257                 cp_back(' ');
 258         ret = eval(sbuf_buf(&sbuf), '\0') > 0;
 259         sbuf_done(&sbuf);
 260         return ret;
 261 }
 262
 263 static int ie_cond[NIES];       /* .ie condition stack */
 264 static int ie_depth;
 265
 266 static void tr_if(char **args)
 267 {
 268         int neg = 0;
 269         int ret;
 270         int c;
 271         do {
 272                 c = cp_next();
 273         } while (c == ' ' || c == '\t');
 274         if (c == '!') {
 275                 neg = 1;
 276                 c = cp_next();
 277         }
 278         cp_back(c);
 279         if (strchr("oetn", c)) {
 280                 ret = if_cond();
 281         } else if (!isdigit(c) && !strchr("-+*/%<=>&:.|()", c)) {
 282                 ret = if_strcmp();
 283         } else {
 284                 ret = if_eval();
 285         }
 286         if (args[0][1] == 'i' && args[0][2] == 'e')     /* .ie command */
 287                 if (ie_depth < NIES)
 288                         ie_cond[ie_depth++] = ret != neg;
 289         cp_blk(ret == neg);
 290 }
 291
 292 static void tr_el(char **args)
 293 {
 294         cp_blk(ie_depth > 0 ? ie_cond[--ie_depth] : 1);
 295 }
 296
 297 static void tr_na(char **args)
 298 {
 299         n_na = 1;
 300 }
 301
 302 static void tr_ad(char **args)
 303 {
 304         n_na = 0;
 305         if (!args[1])
 306                 return;
 307         switch (args[1][0]) {
 308         case '0' + AD_L:
 309         case 'l':
 310                 n_j = AD_L;
 311                 break;
 312         case '0' + AD_R:
 313         case 'r':
 314                 n_j = AD_R;
 315                 break;
 316         case '0' + AD_C:
 317         case 'c':
 318                 n_j = AD_C;
 319                 break;
 320         case '0' + AD_B:
 321         case 'b':
 322         case 'n':
 323                 n_j = AD_B;
 324                 break;
 325         }
 326 }
 327
 328 static void tr_tm(char **args)
 329 {
 330         fprintf(stderr, "%s\n", args[1]);
 331 }
 332
 333 static void tr_so(char **args)
 334 {
 335         if (args[1])
 336                 in_so(args[1]);
 337 }
 338
 339 static void tr_nx(char **args)
 340 {
 341         if (args[1])
 342                 in_nx(args[1]);
 343 }
 344
 345 static void tr_ex(char **args)
 346 {
 347         in_ex();
 348 }
 349
 350 static void tr_lt(char **args)
 351 {
 352         int lt = args[1] ? eval_re(args[1], n_lt, 'm') : n_t0;
 353         n_t0 = n_t0;
 354         n_lt = MAX(0, lt);
 355 }
 356
 357 static void tr_pc(char **args)
 358 {
 359         c_pc = args[1] ? args[1][0] : -1;
 360 }
 361
 362 static int tl_next(void)
 363 {
 364         int c = cp_next();
 365         if (c >= 0 && c == c_pc) {
 366                 in_push(num_str(REG('%', '\0')), NULL);
 367                 c = cp_next();
 368         }
 369         return c;
 370 }
 371
 372 static void tr_tl(char **args)
 373 {
 374         int c;
 375         do {
 376                 c = cp_next();
 377         } while (c >= 0 && (c == ' ' || c == '\t'));
 378         cp_back(c);
 379         ren_tl(tl_next, cp_back);
 380         do {
 381                 c = cp_next();
 382         } while (c >= 0 && c != '\n');
 383 }
 384
 385 static void tr_ec(char **args)
 386 {
 387         c_ec = args[1] ? args[1][0] : '\\';
 388 }
 389
 390 static void tr_cc(char **args)
 391 {
 392         c_ec = args[1] ? args[1][0] : '.';
 393 }
 394
 395 static void tr_c2(char **args)
 396 {
 397         c_ec = args[1] ? args[1][0] : '\'';
 398 }
 399
 400 static void tr_eo(char **args)
 401 {
 402         c_ec = -1;
 403 }
 404
 405 static void tr_hc(char **args)
 406 {
 407         strcpy(c_hc, args[1] ? args[1] : "\\%");
 408 }
 409
 410 static void tr_nh(char **args)
 411 {
 412         n_hy = 0;
 413 }
 414
 415 static void tr_hy(char **args)
 416 {
 417         n_hy = args[1] ? atoi(args[1]) : 1;
 418 }
 419
 420 static void tr_lg(char **args)
 421 {
 422         if (args[1])
 423                 n_lg = atoi(args[1]);
 424 }
 425
 426 static void tr_kn(char **args)
 427 {
 428         if (args[1])
 429                 n_kn = atoi(args[1]);
 430 }
 431
 432 static void tr_cp(char **args)
 433 {
 434         if (args[1])
 435                 n_cp = atoi(args[1]);
 436 }
 437
 438 static char *arg_regname(char *s, int len)
 439 {
 440         char *e = n_cp ? s + 2 : s + len;
 441         int c = cp_next();
 442         while (c == ' ' || c == '\t')
 443                 c = cp_next();
 444         while (s < e && c >= 0 && c != ' ' && c != '\t' && c != '\n') {
 445                 *s++ = c;
 446                 c = cp_next();
 447         }
 448         if (c >= 0)
 449                 cp_back(c);
 450         *s++ = '\0';
 451         return s;
 452 }
 453
 454 static char *arg_normal(char *s, int len)
 455 {
 456         char *e = s + len - 1;
 457         int quoted = 0;
 458         int c;
 459         c = cp_next();
 460         while (c == ' ')
 461                 c = cp_next();
 462         if (c == '"') {
 463                 quoted = 1;
 464                 c = cp_next();
 465         }
 466         while (s < e && c > 0 && c != '\n') {
 467                 if (!quoted && c == ' ')
 468                         break;
 469                 if (quoted && c == '"') {
 470                         c = cp_next();
 471                         if (c != '"')
 472                                 break;
 473                 }
 474                 *s++ = c;
 475                 c = cp_next();
 476         }
 477         if (c >= 0)
 478                 cp_back(c);
 479         *s++ = '\0';
 480         return s;
 481 }
 482
 483 static char *arg_string(char *s, int len)
 484 {
 485         char *e = s + len - 1;
 486         int c;
 487         while ((c = cp_next()) == ' ')
 488                 ;
 489         if (c == '"')
 490                 c = cp_next();
 491         while (s < e && c > 0 && c != '\n') {
 492                 *s++ = c;
 493                 c = cp_next();
 494         }
 495         *s++ = '\0';
 496         if (c >= 0)
 497                 cp_back(c);
 498         return s;
 499 }
 500
 501 /* read macro arguments; trims tabs if rmtabs is nonzero */
 502 static int mkargs(char **args, char *buf, int len)
 503 {
 504         char *s = buf;
 505         char *e = buf + len - 1;
 506         int c;
 507         int n = 0;
 508         while (n < NARGS) {
 509                 char *r = s;
 510                 c = cp_next();
 511                 if (c < 0 || c == '\n')
 512                         return n;
 513                 cp_back(c);
 514                 s = arg_normal(s, e - s);
 515                 if (*r != '\0')
 516                         args[n++] = r;
 517         }
 518         jmp_eol();
 519         return n;
 520 }
 521
 522 /* read request arguments; trims tabs too */
 523 static int mkargs_req(char **args, char *buf, int len)
 524 {
 525         char *r, *s = buf;
 526         char *e = buf + len - 1;
 527         int c;
 528         int n = 0;
 529         c = cp_next();
 530         while (n < NARGS && s < e) {
 531                 r = s;
 532                 while (c == ' ' || c == '\t')
 533                         c = cp_next();
 534                 while (c >= 0 && c != '\n' && c != ' ' && c != '\t' && s < e) {
 535                         *s++ = c;
 536                         c = cp_next();
 537                 }
 538                 *s++ = '\0';
 539                 if (*r != '\0')
 540                         args[n++] = r;
 541                 if (c < 0 || c == '\n')
 542                         return n;
 543         }
 544         jmp_eol();
 545         return n;
 546 }
 547
 548 /* read arguments for .ds */
 549 static int mkargs_ds(char **args, char *buf, int len)
 550 {
 551         char *s = buf;
 552         char *e = buf + len - 1;
 553         int c;
 554         args[0] = s;
 555         s = arg_regname(s, e - s);
 556         args[1] = s;
 557         cp_wid(0);
 558         s = arg_string(s, e - s);
 559         cp_wid(1);
 560         c = cp_next();
 561         if (c >= 0 && c != '\n')
 562                 jmp_eol();
 563         return 2;
 564 }
 565
 566 /* read arguments for commands .nr that expect a register name */
 567 static int mkargs_reg1(char **args, char *buf, int len)
 568 {
 569         char *s = buf;
 570         char *e = buf + len - 1;
 571         args[0] = s;
 572         s = arg_regname(s, e - s);
 573         return mkargs_req(args + 1, s, e - s) + 1;
 574 }
 575
 576 /* do not read arguments; for .if, .ie and .el */
 577 static int mkargs_null(char **args, char *buf, int len)
 578 {
 579         return 0;
 580 }
 581
 582 /* read the whole line for .tm */
 583 static int mkargs_eol(char **args, char *buf, int len)
 584 {
 585         char *s = buf;
 586         char *e = buf + len - 1;
 587         int c;
 588         args[0] = s;
 589         c = cp_next();
 590         while (c == ' ')
 591                 c = cp_next();
 592         while (s < e && c >= 0 && c != '\n') {
 593                 *s++ = c;
 594                 c = cp_next();
 595         }
 596         *s = '\0';
 597         return 1;
 598 }
 599
 600 static struct cmd {
 601         char *id;
 602         void (*f)(char **args);
 603         int (*args)(char **args, char *buf, int len);
 604 } cmds[] = {
 605         {TR_DIVBEG, tr_divbeg},
 606         {TR_DIVEND, tr_divend},
 607         {TR_EJECT, tr_eject},
 608         {"ad", tr_ad},
 609         {"af", tr_af},
 610         {"am", tr_de, mkargs_reg1},
 611         {"as", tr_as, mkargs_ds},
 612         {"bp", tr_bp},
 613         {"br", tr_br},
 614         {"c2", tr_c2},
 615         {"cc", tr_cc},
 616         {"ce", tr_ce},
 617         {"ch", tr_ch},
 618         {"cp", tr_cp},
 619         {"da", tr_di},
 620         {"de", tr_de, mkargs_reg1},
 621         {"di", tr_di},
 622         {"ds", tr_ds, mkargs_ds},
 623         {"dt", tr_dt},
 624         {"ec", tr_ec},
 625         {"el", tr_el, mkargs_null},
 626         {"em", tr_em},
 627         {"eo", tr_eo},
 628         {"ev", tr_ev},
 629         {"ex", tr_ex},
 630         {"fc", tr_fc},
 631         {"fi", tr_fi},
 632         {"fp", tr_fp},
 633         {"ft", tr_ft},
 634         {"hc", tr_hc},
 635         {"hy", tr_hy},
 636         {"hw", tr_hw},
 637         {"ie", tr_if, mkargs_null},
 638         {"if", tr_if, mkargs_null},
 639         {"ig", tr_ig},
 640         {"in", tr_in},
 641         {"kn", tr_kn},
 642         {"lg", tr_lg},
 643         {"ll", tr_ll},
 644         {"ls", tr_ls},
 645         {"lt", tr_lt},
 646         {"mk", tr_mk},
 647         {"na", tr_na},
 648         {"ne", tr_ne},
 649         {"nf", tr_nf},
 650         {"nh", tr_nh},
 651         {"nr", tr_nr, mkargs_reg1},
 652         {"ns", tr_ns},
 653         {"nx", tr_nx},
 654         {"os", tr_os},
 655         {"pc", tr_pc},
 656         {"pl", tr_pl},
 657         {"pn", tr_pn},
 658         {"po", tr_po},
 659         {"ps", tr_ps},
 660         {"rm", tr_rm},
 661         {"rn", tr_rn},
 662         {"rr", tr_rr},
 663         {"rs", tr_rs},
 664         {"rt", tr_rt},
 665         {"so", tr_so},
 666         {"sp", tr_sp},
 667         {"sv", tr_sv},
 668         {"ta", tr_ta},
 669         {"ti", tr_ti},
 670         {"tl", tr_tl, mkargs_null},
 671         {"tm", tr_tm, mkargs_eol},
 672         {"vs", tr_vs},
 673         {"wh", tr_wh},
 674 };
 675
 676 int tr_next(void)
 677 {
 678         int c = cp_next();
 679         int nl = c == '\n';
 680         char *args[NARGS + 3] = {NULL};
 681         char cmd[RNLEN];
 682         char buf[LNLEN];
 683         struct cmd *req;
 684         while (tr_nl && c >= 0 && (c == c_cc || c == c_c2)) {
 685                 nl = 1;
 686                 memset(args, 0, sizeof(args));
 687                 args[0] = cmd;
 688                 cmd[0] = c;
 689                 req = NULL;
 690                 arg_regname(cmd + 1, sizeof(cmd) - 1);
 691                 req = str_dget(map(cmd + 1));
 692                 if (req) {
 693                         if (req->args)
 694                                 req->args(args + 1, buf, sizeof(buf));
 695                         else
 696                                 mkargs_req(args + 1, buf, sizeof(buf));
 697                         req->f(args);
 698                 } else {
 699                         cp_wid(0);
 700                         mkargs(args + 1, buf, sizeof(buf));
 701                         cp_wid(1);
 702                         if (str_get(map(cmd + 1)))
 703                                 in_push(str_get(map(cmd + 1)), args + 1);
 704                 }
 705                 c = cp_next();
 706                 nl = c == '\n';
 707         }
 708         tr_nl = c < 0 || nl;
 709         return c;
 710 }
 711
 712 void tr_init(void)
 713 {
 714         int i;
 715         for (i = 0; i < LEN(cmds); i++)
 716                 str_dset(map(cmds[i].id), &cmds[i]);
 717 }
 718
 719 void tr_first(void)
 720 {
 721         cp_back(tr_next());
 722         tr_nl = 1;
 723 }