1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Kenneth Almquist. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)parser.c 8.7 (Berkeley) 5/16/95"; 36 #endif 37 #endif /* not lint */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <stdlib.h> 42 #include <unistd.h> 43 44 #include "shell.h" 45 #include "parser.h" 46 #include "nodes.h" 47 #include "expand.h" /* defines rmescapes() */ 48 #include "syntax.h" 49 #include "options.h" 50 #include "input.h" 51 #include "output.h" 52 #include "var.h" 53 #include "error.h" 54 #include "memalloc.h" 55 #include "mystring.h" 56 #include "alias.h" 57 #include "show.h" 58 #include "eval.h" 59 #ifndef NO_HISTORY 60 #include "myhistedit.h" 61 #endif 62 63 /* 64 * Shell command parser. 65 */ 66 67 #define EOFMARKLEN 79 68 #define PROMPTLEN 128 69 70 /* values returned by readtoken */ 71 #include "token.h" 72 73 74 75 struct heredoc { 76 struct heredoc *next; /* next here document in list */ 77 union node *here; /* redirection node */ 78 char *eofmark; /* string indicating end of input */ 79 int striptabs; /* if set, strip leading tabs */ 80 }; 81 82 struct parser_temp { 83 struct parser_temp *next; 84 void *data; 85 }; 86 87 88 STATIC struct heredoc *heredoclist; /* list of here documents to read */ 89 STATIC int doprompt; /* if set, prompt the user */ 90 STATIC int needprompt; /* true if interactive and at start of line */ 91 STATIC int lasttoken; /* last token read */ 92 MKINIT int tokpushback; /* last token pushed back */ 93 STATIC char *wordtext; /* text of last word returned by readtoken */ 94 MKINIT int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */ 95 STATIC struct nodelist *backquotelist; 96 STATIC union node *redirnode; 97 STATIC struct heredoc *heredoc; 98 STATIC int quoteflag; /* set if (part of) last token was quoted */ 99 STATIC int startlinno; /* line # where last token started */ 100 STATIC int funclinno; /* line # where the current function started */ 101 STATIC struct parser_temp *parser_temp; 102 103 /* XXX When 'noaliases' is set to one, no alias expansion takes place. */ 104 static int noaliases = 0; 105 106 107 STATIC union node *list(int); 108 STATIC union node *andor(void); 109 STATIC union node *pipeline(void); 110 STATIC union node *command(void); 111 STATIC union node *simplecmd(union node **, union node *); 112 STATIC union node *makename(void); 113 STATIC void parsefname(void); 114 STATIC void parseheredoc(void); 115 STATIC int peektoken(void); 116 STATIC int readtoken(void); 117 STATIC int xxreadtoken(void); 118 STATIC int readtoken1(int, char const *, char *, int); 119 STATIC int noexpand(char *); 120 STATIC void synexpect(int); 121 STATIC void synerror(const char *); 122 STATIC void setprompt(int); 123 124 125 STATIC void * 126 parser_temp_alloc(size_t len) 127 { 128 struct parser_temp *t; 129 130 INTOFF; 131 t = ckmalloc(sizeof(*t)); 132 t->data = NULL; 133 t->next = parser_temp; 134 parser_temp = t; 135 t->data = ckmalloc(len); 136 INTON; 137 return t->data; 138 } 139 140 141 STATIC void * 142 parser_temp_realloc(void *ptr, size_t len) 143 { 144 struct parser_temp *t; 145 146 INTOFF; 147 t = parser_temp; 148 if (ptr != t->data) 149 error("bug: parser_temp_realloc misused"); 150 t->data = ckrealloc(t->data, len); 151 INTON; 152 return t->data; 153 } 154 155 156 STATIC void 157 parser_temp_free_upto(void *ptr) 158 { 159 struct parser_temp *t; 160 int done = 0; 161 162 INTOFF; 163 while (parser_temp != NULL && !done) { 164 t = parser_temp; 165 parser_temp = t->next; 166 done = t->data == ptr; 167 ckfree(t->data); 168 ckfree(t); 169 } 170 INTON; 171 if (!done) 172 error("bug: parser_temp_free_upto misused"); 173 } 174 175 176 STATIC void 177 parser_temp_free_all(void) 178 { 179 struct parser_temp *t; 180 181 INTOFF; 182 while (parser_temp != NULL) { 183 t = parser_temp; 184 parser_temp = t->next; 185 ckfree(t->data); 186 ckfree(t); 187 } 188 INTON; 189 } 190 191 192 /* 193 * Read and parse a command. Returns NEOF on end of file. (NULL is a 194 * valid parse tree indicating a blank line.) 195 */ 196 197 union node * 198 parsecmd(int interact) 199 { 200 int t; 201 202 /* This assumes the parser is not re-entered, 203 * which could happen if we add command substitution on PS1/PS2. 204 */ 205 parser_temp_free_all(); 206 207 tokpushback = 0; 208 doprompt = interact; 209 if (doprompt) 210 setprompt(1); 211 else 212 setprompt(0); 213 needprompt = 0; 214 t = readtoken(); 215 if (t == TEOF) 216 return NEOF; 217 if (t == TNL) 218 return NULL; 219 tokpushback++; 220 return list(1); 221 } 222 223 224 STATIC union node * 225 list(int nlflag) 226 { 227 union node *n1, *n2, *n3; 228 int tok; 229 230 checkkwd = 2; 231 if (nlflag == 0 && tokendlist[peektoken()]) 232 return NULL; 233 n1 = NULL; 234 for (;;) { 235 n2 = andor(); 236 tok = readtoken(); 237 if (tok == TBACKGND) { 238 if (n2->type == NCMD || n2->type == NPIPE) { 239 n2->ncmd.backgnd = 1; 240 } else if (n2->type == NREDIR) { 241 n2->type = NBACKGND; 242 } else { 243 n3 = (union node *)stalloc(sizeof (struct nredir)); 244 n3->type = NBACKGND; 245 n3->nredir.n = n2; 246 n3->nredir.redirect = NULL; 247 n2 = n3; 248 } 249 } 250 if (n1 == NULL) { 251 n1 = n2; 252 } 253 else { 254 n3 = (union node *)stalloc(sizeof (struct nbinary)); 255 n3->type = NSEMI; 256 n3->nbinary.ch1 = n1; 257 n3->nbinary.ch2 = n2; 258 n1 = n3; 259 } 260 switch (tok) { 261 case TBACKGND: 262 case TSEMI: 263 tok = readtoken(); 264 /* FALLTHROUGH */ 265 case TNL: 266 if (tok == TNL) { 267 parseheredoc(); 268 if (nlflag) 269 return n1; 270 } else { 271 tokpushback++; 272 } 273 checkkwd = 2; 274 if (tokendlist[peektoken()]) 275 return n1; 276 break; 277 case TEOF: 278 if (heredoclist) 279 parseheredoc(); 280 else 281 pungetc(); /* push back EOF on input */ 282 return n1; 283 default: 284 if (nlflag) 285 synexpect(-1); 286 tokpushback++; 287 return n1; 288 } 289 } 290 } 291 292 293 294 STATIC union node * 295 andor(void) 296 { 297 union node *n1, *n2, *n3; 298 int t; 299 300 n1 = pipeline(); 301 for (;;) { 302 if ((t = readtoken()) == TAND) { 303 t = NAND; 304 } else if (t == TOR) { 305 t = NOR; 306 } else { 307 tokpushback++; 308 return n1; 309 } 310 n2 = pipeline(); 311 n3 = (union node *)stalloc(sizeof (struct nbinary)); 312 n3->type = t; 313 n3->nbinary.ch1 = n1; 314 n3->nbinary.ch2 = n2; 315 n1 = n3; 316 } 317 } 318 319 320 321 STATIC union node * 322 pipeline(void) 323 { 324 union node *n1, *n2, *pipenode; 325 struct nodelist *lp, *prev; 326 int negate; 327 328 negate = 0; 329 checkkwd = 2; 330 TRACE(("pipeline: entered\n")); 331 while (readtoken() == TNOT) 332 negate = !negate; 333 tokpushback++; 334 n1 = command(); 335 if (readtoken() == TPIPE) { 336 pipenode = (union node *)stalloc(sizeof (struct npipe)); 337 pipenode->type = NPIPE; 338 pipenode->npipe.backgnd = 0; 339 lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 340 pipenode->npipe.cmdlist = lp; 341 lp->n = n1; 342 do { 343 prev = lp; 344 lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 345 lp->n = command(); 346 prev->next = lp; 347 } while (readtoken() == TPIPE); 348 lp->next = NULL; 349 n1 = pipenode; 350 } 351 tokpushback++; 352 if (negate) { 353 n2 = (union node *)stalloc(sizeof (struct nnot)); 354 n2->type = NNOT; 355 n2->nnot.com = n1; 356 return n2; 357 } else 358 return n1; 359 } 360 361 362 363 STATIC union node * 364 command(void) 365 { 366 union node *n1, *n2; 367 union node *ap, **app; 368 union node *cp, **cpp; 369 union node *redir, **rpp; 370 int t, negate = 0; 371 372 checkkwd = 2; 373 redir = NULL; 374 n1 = NULL; 375 rpp = &redir; 376 377 /* Check for redirection which may precede command */ 378 while (readtoken() == TREDIR) { 379 *rpp = n2 = redirnode; 380 rpp = &n2->nfile.next; 381 parsefname(); 382 } 383 tokpushback++; 384 385 while (readtoken() == TNOT) { 386 TRACE(("command: TNOT recognized\n")); 387 negate = !negate; 388 } 389 tokpushback++; 390 391 switch (readtoken()) { 392 case TIF: 393 n1 = (union node *)stalloc(sizeof (struct nif)); 394 n1->type = NIF; 395 if ((n1->nif.test = list(0)) == NULL) 396 synexpect(-1); 397 if (readtoken() != TTHEN) 398 synexpect(TTHEN); 399 n1->nif.ifpart = list(0); 400 n2 = n1; 401 while (readtoken() == TELIF) { 402 n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif)); 403 n2 = n2->nif.elsepart; 404 n2->type = NIF; 405 if ((n2->nif.test = list(0)) == NULL) 406 synexpect(-1); 407 if (readtoken() != TTHEN) 408 synexpect(TTHEN); 409 n2->nif.ifpart = list(0); 410 } 411 if (lasttoken == TELSE) 412 n2->nif.elsepart = list(0); 413 else { 414 n2->nif.elsepart = NULL; 415 tokpushback++; 416 } 417 if (readtoken() != TFI) 418 synexpect(TFI); 419 checkkwd = 1; 420 break; 421 case TWHILE: 422 case TUNTIL: { 423 int got; 424 n1 = (union node *)stalloc(sizeof (struct nbinary)); 425 n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL; 426 if ((n1->nbinary.ch1 = list(0)) == NULL) 427 synexpect(-1); 428 if ((got=readtoken()) != TDO) { 429 TRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : "")); 430 synexpect(TDO); 431 } 432 n1->nbinary.ch2 = list(0); 433 if (readtoken() != TDONE) 434 synexpect(TDONE); 435 checkkwd = 1; 436 break; 437 } 438 case TFOR: 439 if (readtoken() != TWORD || quoteflag || ! goodname(wordtext)) 440 synerror("Bad for loop variable"); 441 n1 = (union node *)stalloc(sizeof (struct nfor)); 442 n1->type = NFOR; 443 n1->nfor.var = wordtext; 444 while (readtoken() == TNL) 445 ; 446 if (lasttoken == TWORD && ! quoteflag && equal(wordtext, "in")) { 447 app = ≈ 448 while (readtoken() == TWORD) { 449 n2 = (union node *)stalloc(sizeof (struct narg)); 450 n2->type = NARG; 451 n2->narg.text = wordtext; 452 n2->narg.backquote = backquotelist; 453 *app = n2; 454 app = &n2->narg.next; 455 } 456 *app = NULL; 457 n1->nfor.args = ap; 458 if (lasttoken != TNL && lasttoken != TSEMI) 459 synexpect(-1); 460 } else { 461 static char argvars[5] = { 462 CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0' 463 }; 464 n2 = (union node *)stalloc(sizeof (struct narg)); 465 n2->type = NARG; 466 n2->narg.text = argvars; 467 n2->narg.backquote = NULL; 468 n2->narg.next = NULL; 469 n1->nfor.args = n2; 470 /* 471 * Newline or semicolon here is optional (but note 472 * that the original Bourne shell only allowed NL). 473 */ 474 if (lasttoken != TNL && lasttoken != TSEMI) 475 tokpushback++; 476 } 477 checkkwd = 2; 478 if ((t = readtoken()) == TDO) 479 t = TDONE; 480 else if (t == TBEGIN) 481 t = TEND; 482 else 483 synexpect(-1); 484 n1->nfor.body = list(0); 485 if (readtoken() != t) 486 synexpect(t); 487 checkkwd = 1; 488 break; 489 case TCASE: 490 n1 = (union node *)stalloc(sizeof (struct ncase)); 491 n1->type = NCASE; 492 if (readtoken() != TWORD) 493 synexpect(TWORD); 494 n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg)); 495 n2->type = NARG; 496 n2->narg.text = wordtext; 497 n2->narg.backquote = backquotelist; 498 n2->narg.next = NULL; 499 while (readtoken() == TNL); 500 if (lasttoken != TWORD || ! equal(wordtext, "in")) 501 synerror("expecting \"in\""); 502 cpp = &n1->ncase.cases; 503 noaliases = 1; /* turn off alias expansion */ 504 checkkwd = 2, readtoken(); 505 while (lasttoken != TESAC) { 506 *cpp = cp = (union node *)stalloc(sizeof (struct nclist)); 507 cp->type = NCLIST; 508 app = &cp->nclist.pattern; 509 if (lasttoken == TLP) 510 readtoken(); 511 for (;;) { 512 *app = ap = (union node *)stalloc(sizeof (struct narg)); 513 ap->type = NARG; 514 ap->narg.text = wordtext; 515 ap->narg.backquote = backquotelist; 516 if (checkkwd = 2, readtoken() != TPIPE) 517 break; 518 app = &ap->narg.next; 519 readtoken(); 520 } 521 ap->narg.next = NULL; 522 if (lasttoken != TRP) 523 noaliases = 0, synexpect(TRP); 524 cp->nclist.body = list(0); 525 526 checkkwd = 2; 527 if ((t = readtoken()) != TESAC) { 528 if (t != TENDCASE) 529 noaliases = 0, synexpect(TENDCASE); 530 else 531 checkkwd = 2, readtoken(); 532 } 533 cpp = &cp->nclist.next; 534 } 535 noaliases = 0; /* reset alias expansion */ 536 *cpp = NULL; 537 checkkwd = 1; 538 break; 539 case TLP: 540 n1 = (union node *)stalloc(sizeof (struct nredir)); 541 n1->type = NSUBSHELL; 542 n1->nredir.n = list(0); 543 n1->nredir.redirect = NULL; 544 if (readtoken() != TRP) 545 synexpect(TRP); 546 checkkwd = 1; 547 break; 548 case TBEGIN: 549 n1 = list(0); 550 if (readtoken() != TEND) 551 synexpect(TEND); 552 checkkwd = 1; 553 break; 554 /* Handle an empty command like other simple commands. */ 555 case TSEMI: 556 case TAND: 557 case TOR: 558 /* 559 * An empty command before a ; doesn't make much sense, and 560 * should certainly be disallowed in the case of `if ;'. 561 */ 562 if (!redir) 563 synexpect(-1); 564 case TNL: 565 case TEOF: 566 case TWORD: 567 case TRP: 568 tokpushback++; 569 n1 = simplecmd(rpp, redir); 570 goto checkneg; 571 default: 572 synexpect(-1); 573 } 574 575 /* Now check for redirection which may follow command */ 576 while (readtoken() == TREDIR) { 577 *rpp = n2 = redirnode; 578 rpp = &n2->nfile.next; 579 parsefname(); 580 } 581 tokpushback++; 582 *rpp = NULL; 583 if (redir) { 584 if (n1->type != NSUBSHELL) { 585 n2 = (union node *)stalloc(sizeof (struct nredir)); 586 n2->type = NREDIR; 587 n2->nredir.n = n1; 588 n1 = n2; 589 } 590 n1->nredir.redirect = redir; 591 } 592 593 checkneg: 594 if (negate) { 595 n2 = (union node *)stalloc(sizeof (struct nnot)); 596 n2->type = NNOT; 597 n2->nnot.com = n1; 598 return n2; 599 } 600 else 601 return n1; 602 } 603 604 605 STATIC union node * 606 simplecmd(union node **rpp, union node *redir) 607 { 608 union node *args, **app; 609 union node **orig_rpp = rpp; 610 union node *n = NULL, *n2; 611 int negate = 0; 612 613 /* If we don't have any redirections already, then we must reset */ 614 /* rpp to be the address of the local redir variable. */ 615 if (redir == 0) 616 rpp = &redir; 617 618 args = NULL; 619 app = &args; 620 /* 621 * We save the incoming value, because we need this for shell 622 * functions. There can not be a redirect or an argument between 623 * the function name and the open parenthesis. 624 */ 625 orig_rpp = rpp; 626 627 while (readtoken() == TNOT) { 628 TRACE(("command: TNOT recognized\n")); 629 negate = !negate; 630 } 631 tokpushback++; 632 633 for (;;) { 634 if (readtoken() == TWORD) { 635 n = (union node *)stalloc(sizeof (struct narg)); 636 n->type = NARG; 637 n->narg.text = wordtext; 638 n->narg.backquote = backquotelist; 639 *app = n; 640 app = &n->narg.next; 641 } else if (lasttoken == TREDIR) { 642 *rpp = n = redirnode; 643 rpp = &n->nfile.next; 644 parsefname(); /* read name of redirection file */ 645 } else if (lasttoken == TLP && app == &args->narg.next 646 && rpp == orig_rpp) { 647 /* We have a function */ 648 if (readtoken() != TRP) 649 synexpect(TRP); 650 funclinno = plinno; 651 #ifdef notdef 652 if (! goodname(n->narg.text)) 653 synerror("Bad function name"); 654 #endif 655 n->type = NDEFUN; 656 n->narg.next = command(); 657 funclinno = 0; 658 goto checkneg; 659 } else { 660 tokpushback++; 661 break; 662 } 663 } 664 *app = NULL; 665 *rpp = NULL; 666 n = (union node *)stalloc(sizeof (struct ncmd)); 667 n->type = NCMD; 668 n->ncmd.backgnd = 0; 669 n->ncmd.args = args; 670 n->ncmd.redirect = redir; 671 672 checkneg: 673 if (negate) { 674 n2 = (union node *)stalloc(sizeof (struct nnot)); 675 n2->type = NNOT; 676 n2->nnot.com = n; 677 return n2; 678 } 679 else 680 return n; 681 } 682 683 STATIC union node * 684 makename(void) 685 { 686 union node *n; 687 688 n = (union node *)stalloc(sizeof (struct narg)); 689 n->type = NARG; 690 n->narg.next = NULL; 691 n->narg.text = wordtext; 692 n->narg.backquote = backquotelist; 693 return n; 694 } 695 696 void fixredir(union node *n, const char *text, int err) 697 { 698 TRACE(("Fix redir %s %d\n", text, err)); 699 if (!err) 700 n->ndup.vname = NULL; 701 702 if (is_digit(text[0]) && text[1] == '\0') 703 n->ndup.dupfd = digit_val(text[0]); 704 else if (text[0] == '-' && text[1] == '\0') 705 n->ndup.dupfd = -1; 706 else { 707 708 if (err) 709 synerror("Bad fd number"); 710 else 711 n->ndup.vname = makename(); 712 } 713 } 714 715 716 STATIC void 717 parsefname(void) 718 { 719 union node *n = redirnode; 720 721 if (readtoken() != TWORD) 722 synexpect(-1); 723 if (n->type == NHERE) { 724 struct heredoc *here = heredoc; 725 struct heredoc *p; 726 int i; 727 728 if (quoteflag == 0) 729 n->type = NXHERE; 730 TRACE(("Here document %d\n", n->type)); 731 if (here->striptabs) { 732 while (*wordtext == '\t') 733 wordtext++; 734 } 735 if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) 736 synerror("Illegal eof marker for << redirection"); 737 rmescapes(wordtext); 738 here->eofmark = wordtext; 739 here->next = NULL; 740 if (heredoclist == NULL) 741 heredoclist = here; 742 else { 743 for (p = heredoclist ; p->next ; p = p->next); 744 p->next = here; 745 } 746 } else if (n->type == NTOFD || n->type == NFROMFD) { 747 fixredir(n, wordtext, 0); 748 } else { 749 n->nfile.fname = makename(); 750 } 751 } 752 753 754 /* 755 * Input any here documents. 756 */ 757 758 STATIC void 759 parseheredoc(void) 760 { 761 struct heredoc *here; 762 union node *n; 763 764 while (heredoclist) { 765 here = heredoclist; 766 heredoclist = here->next; 767 if (needprompt) { 768 setprompt(2); 769 needprompt = 0; 770 } 771 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, 772 here->eofmark, here->striptabs); 773 n = (union node *)stalloc(sizeof (struct narg)); 774 n->narg.type = NARG; 775 n->narg.next = NULL; 776 n->narg.text = wordtext; 777 n->narg.backquote = backquotelist; 778 here->here->nhere.doc = n; 779 } 780 } 781 782 STATIC int 783 peektoken(void) 784 { 785 int t; 786 787 t = readtoken(); 788 tokpushback++; 789 return (t); 790 } 791 792 STATIC int 793 readtoken(void) 794 { 795 int t; 796 int savecheckkwd = checkkwd; 797 struct alias *ap; 798 #ifdef DEBUG 799 int alreadyseen = tokpushback; 800 #endif 801 802 top: 803 t = xxreadtoken(); 804 805 if (checkkwd) { 806 /* 807 * eat newlines 808 */ 809 if (checkkwd == 2) { 810 checkkwd = 0; 811 while (t == TNL) { 812 parseheredoc(); 813 t = xxreadtoken(); 814 } 815 } else 816 checkkwd = 0; 817 /* 818 * check for keywords and aliases 819 */ 820 if (t == TWORD && !quoteflag) 821 { 822 const char * const *pp; 823 824 for (pp = parsekwd; *pp; pp++) { 825 if (**pp == *wordtext && equal(*pp, wordtext)) 826 { 827 lasttoken = t = pp - parsekwd + KWDOFFSET; 828 TRACE(("keyword %s recognized\n", tokname[t])); 829 goto out; 830 } 831 } 832 if (noaliases == 0 && 833 (ap = lookupalias(wordtext, 1)) != NULL) { 834 pushstring(ap->val, strlen(ap->val), ap); 835 checkkwd = savecheckkwd; 836 goto top; 837 } 838 } 839 out: 840 checkkwd = (t == TNOT) ? savecheckkwd : 0; 841 } 842 #ifdef DEBUG 843 if (!alreadyseen) 844 TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); 845 else 846 TRACE(("reread token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); 847 #endif 848 return (t); 849 } 850 851 852 /* 853 * Read the next input token. 854 * If the token is a word, we set backquotelist to the list of cmds in 855 * backquotes. We set quoteflag to true if any part of the word was 856 * quoted. 857 * If the token is TREDIR, then we set redirnode to a structure containing 858 * the redirection. 859 * In all cases, the variable startlinno is set to the number of the line 860 * on which the token starts. 861 * 862 * [Change comment: here documents and internal procedures] 863 * [Readtoken shouldn't have any arguments. Perhaps we should make the 864 * word parsing code into a separate routine. In this case, readtoken 865 * doesn't need to have any internal procedures, but parseword does. 866 * We could also make parseoperator in essence the main routine, and 867 * have parseword (readtoken1?) handle both words and redirection.] 868 */ 869 870 #define RETURN(token) return lasttoken = token 871 872 STATIC int 873 xxreadtoken(void) 874 { 875 int c; 876 877 if (tokpushback) { 878 tokpushback = 0; 879 return lasttoken; 880 } 881 if (needprompt) { 882 setprompt(2); 883 needprompt = 0; 884 } 885 startlinno = plinno; 886 for (;;) { /* until token or start of word found */ 887 c = pgetc_macro(); 888 if (c == ' ' || c == '\t') 889 continue; /* quick check for white space first */ 890 switch (c) { 891 case ' ': case '\t': 892 continue; 893 case '#': 894 while ((c = pgetc()) != '\n' && c != PEOF); 895 pungetc(); 896 continue; 897 case '\\': 898 if (pgetc() == '\n') { 899 startlinno = ++plinno; 900 if (doprompt) 901 setprompt(2); 902 else 903 setprompt(0); 904 continue; 905 } 906 pungetc(); 907 goto breakloop; 908 case '\n': 909 plinno++; 910 needprompt = doprompt; 911 RETURN(TNL); 912 case PEOF: 913 RETURN(TEOF); 914 case '&': 915 if (pgetc() == '&') 916 RETURN(TAND); 917 pungetc(); 918 RETURN(TBACKGND); 919 case '|': 920 if (pgetc() == '|') 921 RETURN(TOR); 922 pungetc(); 923 RETURN(TPIPE); 924 case ';': 925 if (pgetc() == ';') 926 RETURN(TENDCASE); 927 pungetc(); 928 RETURN(TSEMI); 929 case '(': 930 RETURN(TLP); 931 case ')': 932 RETURN(TRP); 933 default: 934 goto breakloop; 935 } 936 } 937 breakloop: 938 return readtoken1(c, BASESYNTAX, (char *)NULL, 0); 939 #undef RETURN 940 } 941 942 943 #define MAXNEST_STATIC 8 944 struct tokenstate 945 { 946 const char *syntax; /* *SYNTAX */ 947 int parenlevel; /* levels of parentheses in arithmetic */ 948 enum tokenstate_category 949 { 950 TSTATE_TOP, 951 TSTATE_VAR_OLD, /* ${var+-=?}, inherits dquotes */ 952 TSTATE_VAR_NEW, /* other ${var...}, own dquote state */ 953 TSTATE_ARITH 954 } category; 955 }; 956 957 958 /* 959 * Called to parse command substitutions. 960 */ 961 962 STATIC char * 963 parsebackq(char *out, struct nodelist **pbqlist, 964 int oldstyle, int dblquote, int quoted) 965 { 966 struct nodelist **nlpp; 967 union node *n; 968 char *volatile str; 969 struct jmploc jmploc; 970 struct jmploc *const savehandler = handler; 971 int savelen; 972 int saveprompt; 973 const int bq_startlinno = plinno; 974 char *volatile ostr = NULL; 975 struct parsefile *const savetopfile = getcurrentfile(); 976 977 str = NULL; 978 if (setjmp(jmploc.loc)) { 979 popfilesupto(savetopfile); 980 if (str) 981 ckfree(str); 982 if (ostr) 983 ckfree(ostr); 984 handler = savehandler; 985 if (exception == EXERROR) { 986 startlinno = bq_startlinno; 987 synerror("Error in command substitution"); 988 } 989 longjmp(handler->loc, 1); 990 } 991 INTOFF; 992 savelen = out - stackblock(); 993 if (savelen > 0) { 994 str = ckmalloc(savelen); 995 memcpy(str, stackblock(), savelen); 996 } 997 handler = &jmploc; 998 INTON; 999 if (oldstyle) { 1000 /* We must read until the closing backquote, giving special 1001 treatment to some slashes, and then push the string and 1002 reread it as input, interpreting it normally. */ 1003 char *oout; 1004 int c; 1005 int olen; 1006 1007 1008 STARTSTACKSTR(oout); 1009 for (;;) { 1010 if (needprompt) { 1011 setprompt(2); 1012 needprompt = 0; 1013 } 1014 switch (c = pgetc()) { 1015 case '`': 1016 goto done; 1017 1018 case '\\': 1019 if ((c = pgetc()) == '\n') { 1020 plinno++; 1021 if (doprompt) 1022 setprompt(2); 1023 else 1024 setprompt(0); 1025 /* 1026 * If eating a newline, avoid putting 1027 * the newline into the new character 1028 * stream (via the STPUTC after the 1029 * switch). 1030 */ 1031 continue; 1032 } 1033 if (c != '\\' && c != '`' && c != '$' 1034 && (!dblquote || c != '"')) 1035 STPUTC('\\', oout); 1036 break; 1037 1038 case '\n': 1039 plinno++; 1040 needprompt = doprompt; 1041 break; 1042 1043 case PEOF: 1044 startlinno = plinno; 1045 synerror("EOF in backquote substitution"); 1046 break; 1047 1048 default: 1049 break; 1050 } 1051 STPUTC(c, oout); 1052 } 1053 done: 1054 STPUTC('\0', oout); 1055 olen = oout - stackblock(); 1056 INTOFF; 1057 ostr = ckmalloc(olen); 1058 memcpy(ostr, stackblock(), olen); 1059 setinputstring(ostr, 1); 1060 INTON; 1061 } 1062 nlpp = pbqlist; 1063 while (*nlpp) 1064 nlpp = &(*nlpp)->next; 1065 *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 1066 (*nlpp)->next = NULL; 1067 1068 if (oldstyle) { 1069 saveprompt = doprompt; 1070 doprompt = 0; 1071 } 1072 1073 n = list(0); 1074 1075 if (oldstyle) 1076 doprompt = saveprompt; 1077 else { 1078 if (readtoken() != TRP) 1079 synexpect(TRP); 1080 } 1081 1082 (*nlpp)->n = n; 1083 if (oldstyle) { 1084 /* 1085 * Start reading from old file again, ignoring any pushed back 1086 * tokens left from the backquote parsing 1087 */ 1088 popfile(); 1089 tokpushback = 0; 1090 } 1091 while (stackblocksize() <= savelen) 1092 growstackblock(); 1093 STARTSTACKSTR(out); 1094 if (str) { 1095 memcpy(out, str, savelen); 1096 STADJUST(savelen, out); 1097 INTOFF; 1098 ckfree(str); 1099 str = NULL; 1100 INTON; 1101 } 1102 if (ostr) { 1103 INTOFF; 1104 ckfree(ostr); 1105 ostr = NULL; 1106 INTON; 1107 } 1108 handler = savehandler; 1109 if (quoted) 1110 USTPUTC(CTLBACKQ | CTLQUOTE, out); 1111 else 1112 USTPUTC(CTLBACKQ, out); 1113 return out; 1114 } 1115 1116 1117 /* 1118 * If eofmark is NULL, read a word or a redirection symbol. If eofmark 1119 * is not NULL, read a here document. In the latter case, eofmark is the 1120 * word which marks the end of the document and striptabs is true if 1121 * leading tabs should be stripped from the document. The argument firstc 1122 * is the first character of the input token or document. 1123 * 1124 * Because C does not have internal subroutines, I have simulated them 1125 * using goto's to implement the subroutine linkage. The following macros 1126 * will run code that appears at the end of readtoken1. 1127 */ 1128 1129 #define CHECKEND() {goto checkend; checkend_return:;} 1130 #define PARSEREDIR() {goto parseredir; parseredir_return:;} 1131 #define PARSESUB() {goto parsesub; parsesub_return:;} 1132 #define PARSEARITH() {goto parsearith; parsearith_return:;} 1133 1134 STATIC int 1135 readtoken1(int firstc, char const *initialsyntax, char *eofmark, int striptabs) 1136 { 1137 int c = firstc; 1138 char *out; 1139 int len; 1140 char line[EOFMARKLEN + 1]; 1141 struct nodelist *bqlist; 1142 int quotef; 1143 int newvarnest; 1144 int level; 1145 int synentry; 1146 struct tokenstate state_static[MAXNEST_STATIC]; 1147 int maxnest = MAXNEST_STATIC; 1148 struct tokenstate *state = state_static; 1149 1150 startlinno = plinno; 1151 quotef = 0; 1152 bqlist = NULL; 1153 newvarnest = 0; 1154 level = 0; 1155 state[level].syntax = initialsyntax; 1156 state[level].parenlevel = 0; 1157 state[level].category = TSTATE_TOP; 1158 1159 STARTSTACKSTR(out); 1160 loop: { /* for each line, until end of word */ 1161 CHECKEND(); /* set c to PEOF if at end of here document */ 1162 for (;;) { /* until end of line or end of word */ 1163 CHECKSTRSPACE(3, out); /* permit 3 calls to USTPUTC */ 1164 1165 synentry = state[level].syntax[c]; 1166 1167 switch(synentry) { 1168 case CNL: /* '\n' */ 1169 if (state[level].syntax == BASESYNTAX) 1170 goto endword; /* exit outer loop */ 1171 USTPUTC(c, out); 1172 plinno++; 1173 if (doprompt) 1174 setprompt(2); 1175 else 1176 setprompt(0); 1177 c = pgetc(); 1178 goto loop; /* continue outer loop */ 1179 case CWORD: 1180 USTPUTC(c, out); 1181 break; 1182 case CCTL: 1183 if (eofmark == NULL || initialsyntax != SQSYNTAX) 1184 USTPUTC(CTLESC, out); 1185 USTPUTC(c, out); 1186 break; 1187 case CBACK: /* backslash */ 1188 c = pgetc(); 1189 if (c == PEOF) { 1190 USTPUTC('\\', out); 1191 pungetc(); 1192 } else if (c == '\n') { 1193 plinno++; 1194 if (doprompt) 1195 setprompt(2); 1196 else 1197 setprompt(0); 1198 } else { 1199 if (state[level].syntax == DQSYNTAX && 1200 c != '\\' && c != '`' && c != '$' && 1201 (c != '"' || (eofmark != NULL && 1202 newvarnest == 0)) && 1203 (c != '}' || state[level].category != TSTATE_VAR_OLD)) 1204 USTPUTC('\\', out); 1205 if (SQSYNTAX[c] == CCTL) 1206 USTPUTC(CTLESC, out); 1207 else if (eofmark == NULL || 1208 newvarnest > 0) 1209 USTPUTC(CTLQUOTEMARK, out); 1210 USTPUTC(c, out); 1211 quotef++; 1212 } 1213 break; 1214 case CSQUOTE: 1215 USTPUTC(CTLQUOTEMARK, out); 1216 state[level].syntax = SQSYNTAX; 1217 break; 1218 case CDQUOTE: 1219 USTPUTC(CTLQUOTEMARK, out); 1220 state[level].syntax = DQSYNTAX; 1221 break; 1222 case CENDQUOTE: 1223 if (eofmark != NULL && newvarnest == 0) 1224 USTPUTC(c, out); 1225 else { 1226 if (state[level].category == TSTATE_ARITH) 1227 state[level].syntax = ARISYNTAX; 1228 else 1229 state[level].syntax = BASESYNTAX; 1230 quotef++; 1231 } 1232 break; 1233 case CVAR: /* '$' */ 1234 PARSESUB(); /* parse substitution */ 1235 break; 1236 case CENDVAR: /* '}' */ 1237 if (level > 0 && 1238 (state[level].category == TSTATE_VAR_OLD || 1239 state[level].category == TSTATE_VAR_NEW)) { 1240 if (state[level].category == TSTATE_VAR_OLD) 1241 state[level - 1].syntax = state[level].syntax; 1242 else 1243 newvarnest--; 1244 level--; 1245 USTPUTC(CTLENDVAR, out); 1246 } else { 1247 USTPUTC(c, out); 1248 } 1249 break; 1250 case CLP: /* '(' in arithmetic */ 1251 state[level].parenlevel++; 1252 USTPUTC(c, out); 1253 break; 1254 case CRP: /* ')' in arithmetic */ 1255 if (state[level].parenlevel > 0) { 1256 USTPUTC(c, out); 1257 --state[level].parenlevel; 1258 } else { 1259 if (pgetc() == ')') { 1260 if (level > 0 && 1261 state[level].category == TSTATE_ARITH) { 1262 level--; 1263 USTPUTC(CTLENDARI, out); 1264 } else 1265 USTPUTC(')', out); 1266 } else { 1267 /* 1268 * unbalanced parens 1269 * (don't 2nd guess - no error) 1270 */ 1271 pungetc(); 1272 USTPUTC(')', out); 1273 } 1274 } 1275 break; 1276 case CBQUOTE: /* '`' */ 1277 out = parsebackq(out, &bqlist, 1, 1278 state[level].syntax == DQSYNTAX && 1279 (eofmark == NULL || newvarnest > 0), 1280 state[level].syntax == DQSYNTAX || state[level].syntax == ARISYNTAX); 1281 break; 1282 case CEOF: 1283 goto endword; /* exit outer loop */ 1284 default: 1285 if (level == 0) 1286 goto endword; /* exit outer loop */ 1287 USTPUTC(c, out); 1288 } 1289 c = pgetc_macro(); 1290 } 1291 } 1292 endword: 1293 if (state[level].syntax == ARISYNTAX) 1294 synerror("Missing '))'"); 1295 if (state[level].syntax != BASESYNTAX && eofmark == NULL) 1296 synerror("Unterminated quoted string"); 1297 if (state[level].category == TSTATE_VAR_OLD || 1298 state[level].category == TSTATE_VAR_NEW) { 1299 startlinno = plinno; 1300 synerror("Missing '}'"); 1301 } 1302 if (state != state_static) 1303 parser_temp_free_upto(state); 1304 USTPUTC('\0', out); 1305 len = out - stackblock(); 1306 out = stackblock(); 1307 if (eofmark == NULL) { 1308 if ((c == '>' || c == '<') 1309 && quotef == 0 1310 && len <= 2 1311 && (*out == '\0' || is_digit(*out))) { 1312 PARSEREDIR(); 1313 return lasttoken = TREDIR; 1314 } else { 1315 pungetc(); 1316 } 1317 } 1318 quoteflag = quotef; 1319 backquotelist = bqlist; 1320 grabstackblock(len); 1321 wordtext = out; 1322 return lasttoken = TWORD; 1323 /* end of readtoken routine */ 1324 1325 1326 /* 1327 * Check to see whether we are at the end of the here document. When this 1328 * is called, c is set to the first character of the next input line. If 1329 * we are at the end of the here document, this routine sets the c to PEOF. 1330 */ 1331 1332 checkend: { 1333 if (eofmark) { 1334 if (striptabs) { 1335 while (c == '\t') 1336 c = pgetc(); 1337 } 1338 if (c == *eofmark) { 1339 if (pfgets(line, sizeof line) != NULL) { 1340 char *p, *q; 1341 1342 p = line; 1343 for (q = eofmark + 1 ; *q && *p == *q ; p++, q++); 1344 if (*p == '\n' && *q == '\0') { 1345 c = PEOF; 1346 plinno++; 1347 needprompt = doprompt; 1348 } else { 1349 pushstring(line, strlen(line), NULL); 1350 } 1351 } 1352 } 1353 } 1354 goto checkend_return; 1355 } 1356 1357 1358 /* 1359 * Parse a redirection operator. The variable "out" points to a string 1360 * specifying the fd to be redirected. The variable "c" contains the 1361 * first character of the redirection operator. 1362 */ 1363 1364 parseredir: { 1365 char fd = *out; 1366 union node *np; 1367 1368 np = (union node *)stalloc(sizeof (struct nfile)); 1369 if (c == '>') { 1370 np->nfile.fd = 1; 1371 c = pgetc(); 1372 if (c == '>') 1373 np->type = NAPPEND; 1374 else if (c == '&') 1375 np->type = NTOFD; 1376 else if (c == '|') 1377 np->type = NCLOBBER; 1378 else { 1379 np->type = NTO; 1380 pungetc(); 1381 } 1382 } else { /* c == '<' */ 1383 np->nfile.fd = 0; 1384 c = pgetc(); 1385 if (c == '<') { 1386 if (sizeof (struct nfile) != sizeof (struct nhere)) { 1387 np = (union node *)stalloc(sizeof (struct nhere)); 1388 np->nfile.fd = 0; 1389 } 1390 np->type = NHERE; 1391 heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc)); 1392 heredoc->here = np; 1393 if ((c = pgetc()) == '-') { 1394 heredoc->striptabs = 1; 1395 } else { 1396 heredoc->striptabs = 0; 1397 pungetc(); 1398 } 1399 } else if (c == '&') 1400 np->type = NFROMFD; 1401 else if (c == '>') 1402 np->type = NFROMTO; 1403 else { 1404 np->type = NFROM; 1405 pungetc(); 1406 } 1407 } 1408 if (fd != '\0') 1409 np->nfile.fd = digit_val(fd); 1410 redirnode = np; 1411 goto parseredir_return; 1412 } 1413 1414 1415 /* 1416 * Parse a substitution. At this point, we have read the dollar sign 1417 * and nothing else. 1418 */ 1419 1420 parsesub: { 1421 char buf[10]; 1422 int subtype; 1423 int typeloc; 1424 int flags; 1425 char *p; 1426 static const char types[] = "}-+?="; 1427 int bracketed_name = 0; /* used to handle ${[0-9]*} variables */ 1428 int i; 1429 int linno; 1430 int length; 1431 1432 c = pgetc(); 1433 if (c != '(' && c != '{' && (is_eof(c) || !is_name(c)) && 1434 !is_special(c)) { 1435 USTPUTC('$', out); 1436 pungetc(); 1437 } else if (c == '(') { /* $(command) or $((arith)) */ 1438 if (pgetc() == '(') { 1439 PARSEARITH(); 1440 } else { 1441 pungetc(); 1442 out = parsebackq(out, &bqlist, 0, 1443 state[level].syntax == DQSYNTAX && 1444 (eofmark == NULL || newvarnest > 0), 1445 state[level].syntax == DQSYNTAX || 1446 state[level].syntax == ARISYNTAX); 1447 } 1448 } else { 1449 USTPUTC(CTLVAR, out); 1450 typeloc = out - stackblock(); 1451 USTPUTC(VSNORMAL, out); 1452 subtype = VSNORMAL; 1453 flags = 0; 1454 if (c == '{') { 1455 bracketed_name = 1; 1456 c = pgetc(); 1457 if (c == '#') { 1458 if ((c = pgetc()) == '}') 1459 c = '#'; 1460 else 1461 subtype = VSLENGTH; 1462 } 1463 else 1464 subtype = 0; 1465 } 1466 if (!is_eof(c) && is_name(c)) { 1467 length = 0; 1468 do { 1469 STPUTC(c, out); 1470 c = pgetc(); 1471 length++; 1472 } while (!is_eof(c) && is_in_name(c)); 1473 if (length == 6 && 1474 strncmp(out - length, "LINENO", length) == 0) { 1475 /* Replace the variable name with the 1476 * current line number. */ 1477 linno = plinno; 1478 if (funclinno != 0) 1479 linno -= funclinno - 1; 1480 snprintf(buf, sizeof(buf), "%d", linno); 1481 STADJUST(-6, out); 1482 for (i = 0; buf[i] != '\0'; i++) 1483 STPUTC(buf[i], out); 1484 flags |= VSLINENO; 1485 } 1486 } else if (is_digit(c)) { 1487 if (bracketed_name) { 1488 do { 1489 STPUTC(c, out); 1490 c = pgetc(); 1491 } while (is_digit(c)); 1492 } else { 1493 STPUTC(c, out); 1494 c = pgetc(); 1495 } 1496 } else { 1497 if (! is_special(c)) { 1498 subtype = VSERROR; 1499 if (c == '}') 1500 pungetc(); 1501 else if (c == '\n' || c == PEOF) 1502 synerror("Unexpected end of line in substitution"); 1503 else 1504 USTPUTC(c, out); 1505 } else { 1506 USTPUTC(c, out); 1507 c = pgetc(); 1508 } 1509 } 1510 if (subtype == 0) { 1511 switch (c) { 1512 case ':': 1513 flags |= VSNUL; 1514 c = pgetc(); 1515 /*FALLTHROUGH*/ 1516 default: 1517 p = strchr(types, c); 1518 if (p == NULL) { 1519 if (c == '\n' || c == PEOF) 1520 synerror("Unexpected end of line in substitution"); 1521 if (flags == VSNUL) 1522 STPUTC(':', out); 1523 STPUTC(c, out); 1524 subtype = VSERROR; 1525 } else 1526 subtype = p - types + VSNORMAL; 1527 break; 1528 case '%': 1529 case '#': 1530 { 1531 int cc = c; 1532 subtype = c == '#' ? VSTRIMLEFT : 1533 VSTRIMRIGHT; 1534 c = pgetc(); 1535 if (c == cc) 1536 subtype++; 1537 else 1538 pungetc(); 1539 break; 1540 } 1541 } 1542 } else if (subtype != VSERROR) { 1543 pungetc(); 1544 } 1545 STPUTC('=', out); 1546 if (subtype != VSLENGTH && (state[level].syntax == DQSYNTAX || 1547 state[level].syntax == ARISYNTAX)) 1548 flags |= VSQUOTE; 1549 *(stackblock() + typeloc) = subtype | flags; 1550 if (subtype != VSNORMAL) { 1551 if (level + 1 >= maxnest) { 1552 maxnest *= 2; 1553 if (state == state_static) { 1554 state = parser_temp_alloc( 1555 maxnest * sizeof(*state)); 1556 memcpy(state, state_static, 1557 MAXNEST_STATIC * sizeof(*state)); 1558 } else 1559 state = parser_temp_realloc(state, 1560 maxnest * sizeof(*state)); 1561 } 1562 level++; 1563 state[level].parenlevel = 0; 1564 if (subtype == VSMINUS || subtype == VSPLUS || 1565 subtype == VSQUESTION || subtype == VSASSIGN) { 1566 /* 1567 * For operators that were in the Bourne shell, 1568 * inherit the double-quote state. 1569 */ 1570 state[level].syntax = state[level - 1].syntax; 1571 state[level].category = TSTATE_VAR_OLD; 1572 } else { 1573 /* 1574 * The other operators take a pattern, 1575 * so go to BASESYNTAX. 1576 * Also, ' and " are now special, even 1577 * in here documents. 1578 */ 1579 state[level].syntax = BASESYNTAX; 1580 state[level].category = TSTATE_VAR_NEW; 1581 newvarnest++; 1582 } 1583 } 1584 } 1585 goto parsesub_return; 1586 } 1587 1588 1589 /* 1590 * Parse an arithmetic expansion (indicate start of one and set state) 1591 */ 1592 parsearith: { 1593 1594 if (level + 1 >= maxnest) { 1595 maxnest *= 2; 1596 if (state == state_static) { 1597 state = parser_temp_alloc( 1598 maxnest * sizeof(*state)); 1599 memcpy(state, state_static, 1600 MAXNEST_STATIC * sizeof(*state)); 1601 } else 1602 state = parser_temp_realloc(state, 1603 maxnest * sizeof(*state)); 1604 } 1605 level++; 1606 state[level].syntax = ARISYNTAX; 1607 state[level].parenlevel = 0; 1608 state[level].category = TSTATE_ARITH; 1609 USTPUTC(CTLARI, out); 1610 if (state[level - 1].syntax == DQSYNTAX) 1611 USTPUTC('"',out); 1612 else 1613 USTPUTC(' ',out); 1614 goto parsearith_return; 1615 } 1616 1617 } /* end of readtoken */ 1618 1619 1620 1621 #ifdef mkinit 1622 RESET { 1623 tokpushback = 0; 1624 checkkwd = 0; 1625 } 1626 #endif 1627 1628 /* 1629 * Returns true if the text contains nothing to expand (no dollar signs 1630 * or backquotes). 1631 */ 1632 1633 STATIC int 1634 noexpand(char *text) 1635 { 1636 char *p; 1637 char c; 1638 1639 p = text; 1640 while ((c = *p++) != '\0') { 1641 if ( c == CTLQUOTEMARK) 1642 continue; 1643 if (c == CTLESC) 1644 p++; 1645 else if (BASESYNTAX[(int)c] == CCTL) 1646 return 0; 1647 } 1648 return 1; 1649 } 1650 1651 1652 /* 1653 * Return true if the argument is a legal variable name (a letter or 1654 * underscore followed by zero or more letters, underscores, and digits). 1655 */ 1656 1657 int 1658 goodname(const char *name) 1659 { 1660 const char *p; 1661 1662 p = name; 1663 if (! is_name(*p)) 1664 return 0; 1665 while (*++p) { 1666 if (! is_in_name(*p)) 1667 return 0; 1668 } 1669 return 1; 1670 } 1671 1672 1673 /* 1674 * Called when an unexpected token is read during the parse. The argument 1675 * is the token that is expected, or -1 if more than one type of token can 1676 * occur at this point. 1677 */ 1678 1679 STATIC void 1680 synexpect(int token) 1681 { 1682 char msg[64]; 1683 1684 if (token >= 0) { 1685 fmtstr(msg, 64, "%s unexpected (expecting %s)", 1686 tokname[lasttoken], tokname[token]); 1687 } else { 1688 fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]); 1689 } 1690 synerror(msg); 1691 } 1692 1693 1694 STATIC void 1695 synerror(const char *msg) 1696 { 1697 if (commandname) 1698 outfmt(out2, "%s: %d: ", commandname, startlinno); 1699 outfmt(out2, "Syntax error: %s\n", msg); 1700 error((char *)NULL); 1701 } 1702 1703 STATIC void 1704 setprompt(int which) 1705 { 1706 whichprompt = which; 1707 1708 #ifndef NO_HISTORY 1709 if (!el) 1710 #endif 1711 { 1712 out2str(getprompt(NULL)); 1713 flushout(out2); 1714 } 1715 } 1716 1717 /* 1718 * called by editline -- any expansions to the prompt 1719 * should be added here. 1720 */ 1721 char * 1722 getprompt(void *unused __unused) 1723 { 1724 static char ps[PROMPTLEN]; 1725 char *fmt; 1726 int i, j, trim; 1727 static char internal_error[] = "<internal prompt error>"; 1728 1729 /* 1730 * Select prompt format. 1731 */ 1732 switch (whichprompt) { 1733 case 0: 1734 fmt = nullstr; 1735 break; 1736 case 1: 1737 fmt = ps1val(); 1738 break; 1739 case 2: 1740 fmt = ps2val(); 1741 break; 1742 default: 1743 return internal_error; 1744 } 1745 1746 /* 1747 * Format prompt string. 1748 */ 1749 for (i = 0; (i < 127) && (*fmt != '\0'); i++, fmt++) 1750 if (*fmt == '\\') 1751 switch (*++fmt) { 1752 1753 /* 1754 * Hostname. 1755 * 1756 * \h specifies just the local hostname, 1757 * \H specifies fully-qualified hostname. 1758 */ 1759 case 'h': 1760 case 'H': 1761 ps[i] = '\0'; 1762 gethostname(&ps[i], PROMPTLEN - i); 1763 /* Skip to end of hostname. */ 1764 trim = (*fmt == 'h') ? '.' : '\0'; 1765 while ((ps[i+1] != '\0') && (ps[i+1] != trim)) 1766 i++; 1767 break; 1768 1769 /* 1770 * Working directory. 1771 * 1772 * \W specifies just the final component, 1773 * \w specifies the entire path. 1774 */ 1775 case 'W': 1776 case 'w': 1777 ps[i] = '\0'; 1778 getcwd(&ps[i], PROMPTLEN - i); 1779 if (*fmt == 'W' && ps[i + 1] != '\0') { 1780 /* Final path component only. */ 1781 trim = 1; 1782 for (j = i; ps[j] != '\0'; j++) 1783 if (ps[j] == '/') 1784 trim = j + 1; 1785 memmove(&ps[i], &ps[trim], 1786 j - trim + 1); 1787 } 1788 /* Skip to end of path. */ 1789 while (ps[i + 1] != '\0') 1790 i++; 1791 break; 1792 1793 /* 1794 * Superuser status. 1795 * 1796 * '$' for normal users, '#' for root. 1797 */ 1798 case '$': 1799 ps[i] = (geteuid() != 0) ? '$' : '#'; 1800 break; 1801 1802 /* 1803 * A literal \. 1804 */ 1805 case '\\': 1806 ps[i] = '\\'; 1807 break; 1808 1809 /* 1810 * Emit unrecognized formats verbatim. 1811 */ 1812 default: 1813 ps[i++] = '\\'; 1814 ps[i] = *fmt; 1815 break; 1816 } 1817 else 1818 ps[i] = *fmt; 1819 ps[i] = '\0'; 1820 return (ps); 1821 } 1822