1 /* $NetBSD: parser.c,v 1.83 2012/06/17 20:48:27 wiz Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)parser.c 8.7 (Berkeley) 5/16/95"; 39 #else 40 __RCSID("$NetBSD: parser.c,v 1.83 2012/06/17 20:48:27 wiz Exp $"); 41 #endif 42 #endif /* not lint */ 43 44 #include <stdlib.h> 45 #include <limits.h> 46 47 #include "shell.h" 48 #include "parser.h" 49 #include "nodes.h" 50 #include "expand.h" /* defines rmescapes() */ 51 #include "eval.h" /* defines commandname */ 52 #include "redir.h" /* defines copyfd() */ 53 #include "syntax.h" 54 #include "options.h" 55 #include "input.h" 56 #include "output.h" 57 #include "var.h" 58 #include "error.h" 59 #include "memalloc.h" 60 #include "mystring.h" 61 #include "alias.h" 62 #include "show.h" 63 #ifndef SMALL 64 #include "myhistedit.h" 65 #endif 66 67 /* 68 * Shell command parser. 69 */ 70 71 #define EOFMARKLEN 79 72 73 /* values returned by readtoken */ 74 #include "token.h" 75 76 #define OPENBRACE '{' 77 #define CLOSEBRACE '}' 78 79 80 struct heredoc { 81 struct heredoc *next; /* next here document in list */ 82 union node *here; /* redirection node */ 83 char *eofmark; /* string indicating end of input */ 84 int striptabs; /* if set, strip leading tabs */ 85 }; 86 87 88 89 static int noalias = 0; /* when set, don't handle aliases */ 90 struct heredoc *heredoclist; /* list of here documents to read */ 91 int parsebackquote; /* nonzero if we are inside backquotes */ 92 int doprompt; /* if set, prompt the user */ 93 int needprompt; /* true if interactive and at start of line */ 94 int lasttoken; /* last token read */ 95 MKINIT int tokpushback; /* last token pushed back */ 96 char *wordtext; /* text of last word returned by readtoken */ 97 MKINIT int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */ 98 struct nodelist *backquotelist; 99 union node *redirnode; 100 struct heredoc *heredoc; 101 int quoteflag; /* set if (part of) last token was quoted */ 102 int startlinno; /* line # where last token started */ 103 104 105 STATIC union node *list(int, int); 106 STATIC union node *andor(void); 107 STATIC union node *pipeline(void); 108 STATIC union node *command(void); 109 STATIC union node *simplecmd(union node **, union node *); 110 STATIC union node *makename(void); 111 STATIC void parsefname(void); 112 STATIC void parseheredoc(void); 113 STATIC int peektoken(void); 114 STATIC int readtoken(void); 115 STATIC int xxreadtoken(void); 116 STATIC int readtoken1(int, char const *, char *, int); 117 STATIC int noexpand(char *); 118 STATIC void synexpect(int) __dead; 119 STATIC void synerror(const char *) __dead; 120 STATIC void setprompt(int); 121 122 123 /* 124 * Read and parse a command. Returns NEOF on end of file. (NULL is a 125 * valid parse tree indicating a blank line.) 126 */ 127 128 union node * 129 parsecmd(int interact) 130 { 131 int t; 132 133 tokpushback = 0; 134 doprompt = interact; 135 if (doprompt) 136 setprompt(1); 137 else 138 setprompt(0); 139 needprompt = 0; 140 t = readtoken(); 141 if (t == TEOF) 142 return NEOF; 143 if (t == TNL) 144 return NULL; 145 tokpushback++; 146 return list(1, 0); 147 } 148 149 150 STATIC union node * 151 list(int nlflag, int erflag) 152 { 153 union node *n1, *n2, *n3; 154 int tok; 155 TRACE(("list: entered\n")); 156 157 checkkwd = 2; 158 if (nlflag == 0 && tokendlist[peektoken()]) 159 return NULL; 160 n1 = NULL; 161 for (;;) { 162 n2 = andor(); 163 tok = readtoken(); 164 if (tok == TBACKGND) { 165 if (n2->type == NCMD || n2->type == NPIPE) { 166 n2->ncmd.backgnd = 1; 167 } else if (n2->type == NREDIR) { 168 n2->type = NBACKGND; 169 } else { 170 n3 = (union node *)stalloc(sizeof (struct nredir)); 171 n3->type = NBACKGND; 172 n3->nredir.n = n2; 173 n3->nredir.redirect = NULL; 174 n2 = n3; 175 } 176 } 177 if (n1 == NULL) { 178 n1 = n2; 179 } 180 else { 181 n3 = (union node *)stalloc(sizeof (struct nbinary)); 182 n3->type = NSEMI; 183 n3->nbinary.ch1 = n1; 184 n3->nbinary.ch2 = n2; 185 n1 = n3; 186 } 187 switch (tok) { 188 case TBACKGND: 189 case TSEMI: 190 tok = readtoken(); 191 /* fall through */ 192 case TNL: 193 if (tok == TNL) { 194 parseheredoc(); 195 if (nlflag) 196 return n1; 197 } else { 198 tokpushback++; 199 } 200 checkkwd = 2; 201 if (tokendlist[peektoken()]) 202 return n1; 203 break; 204 case TEOF: 205 if (heredoclist) 206 parseheredoc(); 207 else 208 pungetc(); /* push back EOF on input */ 209 return n1; 210 default: 211 if (nlflag || erflag) 212 synexpect(-1); 213 tokpushback++; 214 return n1; 215 } 216 } 217 } 218 219 220 221 STATIC union node * 222 andor(void) 223 { 224 union node *n1, *n2, *n3; 225 int t; 226 227 TRACE(("andor: entered\n")); 228 n1 = pipeline(); 229 for (;;) { 230 if ((t = readtoken()) == TAND) { 231 t = NAND; 232 } else if (t == TOR) { 233 t = NOR; 234 } else { 235 tokpushback++; 236 return n1; 237 } 238 n2 = pipeline(); 239 n3 = (union node *)stalloc(sizeof (struct nbinary)); 240 n3->type = t; 241 n3->nbinary.ch1 = n1; 242 n3->nbinary.ch2 = n2; 243 n1 = n3; 244 } 245 } 246 247 248 249 STATIC union node * 250 pipeline(void) 251 { 252 union node *n1, *n2, *pipenode; 253 struct nodelist *lp, *prev; 254 int negate; 255 256 TRACE(("pipeline: entered\n")); 257 258 negate = 0; 259 checkkwd = 2; 260 while (readtoken() == TNOT) { 261 TRACE(("pipeline: TNOT recognized\n")); 262 negate = !negate; 263 } 264 tokpushback++; 265 n1 = command(); 266 if (readtoken() == TPIPE) { 267 pipenode = (union node *)stalloc(sizeof (struct npipe)); 268 pipenode->type = NPIPE; 269 pipenode->npipe.backgnd = 0; 270 lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 271 pipenode->npipe.cmdlist = lp; 272 lp->n = n1; 273 do { 274 prev = lp; 275 lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 276 lp->n = command(); 277 prev->next = lp; 278 } while (readtoken() == TPIPE); 279 lp->next = NULL; 280 n1 = pipenode; 281 } 282 tokpushback++; 283 if (negate) { 284 TRACE(("negate pipeline\n")); 285 n2 = (union node *)stalloc(sizeof (struct nnot)); 286 n2->type = NNOT; 287 n2->nnot.com = n1; 288 return n2; 289 } else 290 return n1; 291 } 292 293 294 295 STATIC union node * 296 command(void) 297 { 298 union node *n1, *n2; 299 union node *ap, **app; 300 union node *cp, **cpp; 301 union node *redir, **rpp; 302 int t, negate = 0; 303 304 TRACE(("command: entered\n")); 305 306 checkkwd = 2; 307 redir = NULL; 308 n1 = NULL; 309 rpp = &redir; 310 311 /* Check for redirection which may precede command */ 312 while (readtoken() == TREDIR) { 313 *rpp = n2 = redirnode; 314 rpp = &n2->nfile.next; 315 parsefname(); 316 } 317 tokpushback++; 318 319 while (readtoken() == TNOT) { 320 TRACE(("command: TNOT recognized\n")); 321 negate = !negate; 322 } 323 tokpushback++; 324 325 switch (readtoken()) { 326 case TIF: 327 n1 = (union node *)stalloc(sizeof (struct nif)); 328 n1->type = NIF; 329 n1->nif.test = list(0, 0); 330 if (readtoken() != TTHEN) 331 synexpect(TTHEN); 332 n1->nif.ifpart = list(0, 0); 333 n2 = n1; 334 while (readtoken() == TELIF) { 335 n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif)); 336 n2 = n2->nif.elsepart; 337 n2->type = NIF; 338 n2->nif.test = list(0, 0); 339 if (readtoken() != TTHEN) 340 synexpect(TTHEN); 341 n2->nif.ifpart = list(0, 0); 342 } 343 if (lasttoken == TELSE) 344 n2->nif.elsepart = list(0, 0); 345 else { 346 n2->nif.elsepart = NULL; 347 tokpushback++; 348 } 349 if (readtoken() != TFI) 350 synexpect(TFI); 351 checkkwd = 1; 352 break; 353 case TWHILE: 354 case TUNTIL: { 355 int got; 356 n1 = (union node *)stalloc(sizeof (struct nbinary)); 357 n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL; 358 n1->nbinary.ch1 = list(0, 0); 359 if ((got=readtoken()) != TDO) { 360 TRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : "")); 361 synexpect(TDO); 362 } 363 n1->nbinary.ch2 = list(0, 0); 364 if (readtoken() != TDONE) 365 synexpect(TDONE); 366 checkkwd = 1; 367 break; 368 } 369 case TFOR: 370 if (readtoken() != TWORD || quoteflag || ! goodname(wordtext)) 371 synerror("Bad for loop variable"); 372 n1 = (union node *)stalloc(sizeof (struct nfor)); 373 n1->type = NFOR; 374 n1->nfor.var = wordtext; 375 if (readtoken() == TWORD && ! quoteflag && equal(wordtext, "in")) { 376 app = ≈ 377 while (readtoken() == TWORD) { 378 n2 = (union node *)stalloc(sizeof (struct narg)); 379 n2->type = NARG; 380 n2->narg.text = wordtext; 381 n2->narg.backquote = backquotelist; 382 *app = n2; 383 app = &n2->narg.next; 384 } 385 *app = NULL; 386 n1->nfor.args = ap; 387 if (lasttoken != TNL && lasttoken != TSEMI) 388 synexpect(-1); 389 } else { 390 static char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE, 391 '@', '=', '\0'}; 392 n2 = (union node *)stalloc(sizeof (struct narg)); 393 n2->type = NARG; 394 n2->narg.text = argvars; 395 n2->narg.backquote = NULL; 396 n2->narg.next = NULL; 397 n1->nfor.args = n2; 398 /* 399 * Newline or semicolon here is optional (but note 400 * that the original Bourne shell only allowed NL). 401 */ 402 if (lasttoken != TNL && lasttoken != TSEMI) 403 tokpushback++; 404 } 405 checkkwd = 2; 406 if ((t = readtoken()) == TDO) 407 t = TDONE; 408 else if (t == TBEGIN) 409 t = TEND; 410 else 411 synexpect(-1); 412 n1->nfor.body = list(0, 0); 413 if (readtoken() != t) 414 synexpect(t); 415 checkkwd = 1; 416 break; 417 case TCASE: 418 n1 = (union node *)stalloc(sizeof (struct ncase)); 419 n1->type = NCASE; 420 if (readtoken() != TWORD) 421 synexpect(TWORD); 422 n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg)); 423 n2->type = NARG; 424 n2->narg.text = wordtext; 425 n2->narg.backquote = backquotelist; 426 n2->narg.next = NULL; 427 while (readtoken() == TNL); 428 if (lasttoken != TWORD || ! equal(wordtext, "in")) 429 synerror("expecting \"in\""); 430 cpp = &n1->ncase.cases; 431 noalias = 1; 432 checkkwd = 2, readtoken(); 433 do { 434 *cpp = cp = (union node *)stalloc(sizeof (struct nclist)); 435 if (lasttoken == TLP) 436 readtoken(); 437 cp->type = NCLIST; 438 app = &cp->nclist.pattern; 439 for (;;) { 440 *app = ap = (union node *)stalloc(sizeof (struct narg)); 441 ap->type = NARG; 442 ap->narg.text = wordtext; 443 ap->narg.backquote = backquotelist; 444 if (checkkwd = 2, readtoken() != TPIPE) 445 break; 446 app = &ap->narg.next; 447 readtoken(); 448 } 449 ap->narg.next = NULL; 450 noalias = 0; 451 if (lasttoken != TRP) { 452 synexpect(TRP); 453 } 454 cp->nclist.body = list(0, 0); 455 456 checkkwd = 2; 457 if ((t = readtoken()) != TESAC) { 458 if (t != TENDCASE) { 459 noalias = 0; 460 synexpect(TENDCASE); 461 } else { 462 noalias = 1; 463 checkkwd = 2; 464 readtoken(); 465 } 466 } 467 cpp = &cp->nclist.next; 468 } while(lasttoken != TESAC); 469 noalias = 0; 470 *cpp = NULL; 471 checkkwd = 1; 472 break; 473 case TLP: 474 n1 = (union node *)stalloc(sizeof (struct nredir)); 475 n1->type = NSUBSHELL; 476 n1->nredir.n = list(0, 0); 477 n1->nredir.redirect = NULL; 478 if (readtoken() != TRP) 479 synexpect(TRP); 480 checkkwd = 1; 481 break; 482 case TBEGIN: 483 n1 = list(0, 0); 484 if (readtoken() != TEND) 485 synexpect(TEND); 486 checkkwd = 1; 487 break; 488 /* Handle an empty command like other simple commands. */ 489 case TSEMI: 490 /* 491 * An empty command before a ; doesn't make much sense, and 492 * should certainly be disallowed in the case of `if ;'. 493 */ 494 if (!redir) 495 synexpect(-1); 496 case TAND: 497 case TOR: 498 case TNL: 499 case TEOF: 500 case TWORD: 501 case TRP: 502 tokpushback++; 503 n1 = simplecmd(rpp, redir); 504 goto checkneg; 505 default: 506 synexpect(-1); 507 /* NOTREACHED */ 508 } 509 510 /* Now check for redirection which may follow command */ 511 while (readtoken() == TREDIR) { 512 *rpp = n2 = redirnode; 513 rpp = &n2->nfile.next; 514 parsefname(); 515 } 516 tokpushback++; 517 *rpp = NULL; 518 if (redir) { 519 if (n1->type != NSUBSHELL) { 520 n2 = (union node *)stalloc(sizeof (struct nredir)); 521 n2->type = NREDIR; 522 n2->nredir.n = n1; 523 n1 = n2; 524 } 525 n1->nredir.redirect = redir; 526 } 527 528 checkneg: 529 if (negate) { 530 TRACE(("negate command\n")); 531 n2 = (union node *)stalloc(sizeof (struct nnot)); 532 n2->type = NNOT; 533 n2->nnot.com = n1; 534 return n2; 535 } 536 else 537 return n1; 538 } 539 540 541 STATIC union node * 542 simplecmd(union node **rpp, union node *redir) 543 { 544 union node *args, **app; 545 union node **orig_rpp = rpp; 546 union node *n = NULL, *n2; 547 int negate = 0; 548 549 /* If we don't have any redirections already, then we must reset */ 550 /* rpp to be the address of the local redir variable. */ 551 if (redir == 0) 552 rpp = &redir; 553 554 args = NULL; 555 app = &args; 556 /* 557 * We save the incoming value, because we need this for shell 558 * functions. There can not be a redirect or an argument between 559 * the function name and the open parenthesis. 560 */ 561 orig_rpp = rpp; 562 563 while (readtoken() == TNOT) { 564 TRACE(("simplcmd: TNOT recognized\n")); 565 negate = !negate; 566 } 567 tokpushback++; 568 569 for (;;) { 570 if (readtoken() == TWORD) { 571 n = (union node *)stalloc(sizeof (struct narg)); 572 n->type = NARG; 573 n->narg.text = wordtext; 574 n->narg.backquote = backquotelist; 575 *app = n; 576 app = &n->narg.next; 577 } else if (lasttoken == TREDIR) { 578 *rpp = n = redirnode; 579 rpp = &n->nfile.next; 580 parsefname(); /* read name of redirection file */ 581 } else if (lasttoken == TLP && app == &args->narg.next 582 && rpp == orig_rpp) { 583 /* We have a function */ 584 if (readtoken() != TRP) 585 synexpect(TRP); 586 rmescapes(n->narg.text); 587 if (!goodname(n->narg.text)) 588 synerror("Bad function name"); 589 n->type = NDEFUN; 590 n->narg.next = command(); 591 goto checkneg; 592 } else { 593 tokpushback++; 594 break; 595 } 596 } 597 *app = NULL; 598 *rpp = NULL; 599 n = (union node *)stalloc(sizeof (struct ncmd)); 600 n->type = NCMD; 601 n->ncmd.backgnd = 0; 602 n->ncmd.args = args; 603 n->ncmd.redirect = redir; 604 605 checkneg: 606 if (negate) { 607 TRACE(("negate simplecmd\n")); 608 n2 = (union node *)stalloc(sizeof (struct nnot)); 609 n2->type = NNOT; 610 n2->nnot.com = n; 611 return n2; 612 } 613 else 614 return n; 615 } 616 617 STATIC union node * 618 makename(void) 619 { 620 union node *n; 621 622 n = (union node *)stalloc(sizeof (struct narg)); 623 n->type = NARG; 624 n->narg.next = NULL; 625 n->narg.text = wordtext; 626 n->narg.backquote = backquotelist; 627 return n; 628 } 629 630 void fixredir(union node *n, const char *text, int err) 631 { 632 TRACE(("Fix redir %s %d\n", text, err)); 633 if (!err) 634 n->ndup.vname = NULL; 635 636 if (is_digit(text[0]) && text[1] == '\0') 637 n->ndup.dupfd = digit_val(text[0]); 638 else if (text[0] == '-' && text[1] == '\0') 639 n->ndup.dupfd = -1; 640 else { 641 642 if (err) 643 synerror("Bad fd number"); 644 else 645 n->ndup.vname = makename(); 646 } 647 } 648 649 650 STATIC void 651 parsefname(void) 652 { 653 union node *n = redirnode; 654 655 if (readtoken() != TWORD) 656 synexpect(-1); 657 if (n->type == NHERE) { 658 struct heredoc *here = heredoc; 659 struct heredoc *p; 660 int i; 661 662 if (quoteflag == 0) 663 n->type = NXHERE; 664 TRACE(("Here document %d\n", n->type)); 665 if (here->striptabs) { 666 while (*wordtext == '\t') 667 wordtext++; 668 } 669 if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) 670 synerror("Illegal eof marker for << redirection"); 671 rmescapes(wordtext); 672 here->eofmark = wordtext; 673 here->next = NULL; 674 if (heredoclist == NULL) 675 heredoclist = here; 676 else { 677 for (p = heredoclist ; p->next ; p = p->next); 678 p->next = here; 679 } 680 } else if (n->type == NTOFD || n->type == NFROMFD) { 681 fixredir(n, wordtext, 0); 682 } else { 683 n->nfile.fname = makename(); 684 } 685 } 686 687 688 /* 689 * Input any here documents. 690 */ 691 692 STATIC void 693 parseheredoc(void) 694 { 695 struct heredoc *here; 696 union node *n; 697 698 while (heredoclist) { 699 here = heredoclist; 700 heredoclist = here->next; 701 if (needprompt) { 702 setprompt(2); 703 needprompt = 0; 704 } 705 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, 706 here->eofmark, here->striptabs); 707 n = (union node *)stalloc(sizeof (struct narg)); 708 n->narg.type = NARG; 709 n->narg.next = NULL; 710 n->narg.text = wordtext; 711 n->narg.backquote = backquotelist; 712 here->here->nhere.doc = n; 713 } 714 } 715 716 STATIC int 717 peektoken(void) 718 { 719 int t; 720 721 t = readtoken(); 722 tokpushback++; 723 return (t); 724 } 725 726 STATIC int 727 readtoken(void) 728 { 729 int t; 730 int savecheckkwd = checkkwd; 731 #ifdef DEBUG 732 int alreadyseen = tokpushback; 733 #endif 734 struct alias *ap; 735 736 top: 737 t = xxreadtoken(); 738 739 if (checkkwd) { 740 /* 741 * eat newlines 742 */ 743 if (checkkwd == 2) { 744 checkkwd = 0; 745 while (t == TNL) { 746 parseheredoc(); 747 t = xxreadtoken(); 748 } 749 } else 750 checkkwd = 0; 751 /* 752 * check for keywords and aliases 753 */ 754 if (t == TWORD && !quoteflag) 755 { 756 const char *const *pp; 757 758 for (pp = parsekwd; *pp; pp++) { 759 if (**pp == *wordtext && equal(*pp, wordtext)) 760 { 761 lasttoken = t = pp - 762 parsekwd + KWDOFFSET; 763 TRACE(("keyword %s recognized\n", tokname[t])); 764 goto out; 765 } 766 } 767 if(!noalias && 768 (ap = lookupalias(wordtext, 1)) != NULL) { 769 pushstring(ap->val, strlen(ap->val), ap); 770 checkkwd = savecheckkwd; 771 goto top; 772 } 773 } 774 out: 775 checkkwd = (t == TNOT) ? savecheckkwd : 0; 776 } 777 TRACE(("%stoken %s %s\n", alreadyseen ? "reread " : "", tokname[t], t == TWORD ? wordtext : "")); 778 return (t); 779 } 780 781 782 /* 783 * Read the next input token. 784 * If the token is a word, we set backquotelist to the list of cmds in 785 * backquotes. We set quoteflag to true if any part of the word was 786 * quoted. 787 * If the token is TREDIR, then we set redirnode to a structure containing 788 * the redirection. 789 * In all cases, the variable startlinno is set to the number of the line 790 * on which the token starts. 791 * 792 * [Change comment: here documents and internal procedures] 793 * [Readtoken shouldn't have any arguments. Perhaps we should make the 794 * word parsing code into a separate routine. In this case, readtoken 795 * doesn't need to have any internal procedures, but parseword does. 796 * We could also make parseoperator in essence the main routine, and 797 * have parseword (readtoken1?) handle both words and redirection.] 798 */ 799 800 #define RETURN(token) return lasttoken = token 801 802 STATIC int 803 xxreadtoken(void) 804 { 805 int c; 806 807 if (tokpushback) { 808 tokpushback = 0; 809 return lasttoken; 810 } 811 if (needprompt) { 812 setprompt(2); 813 needprompt = 0; 814 } 815 startlinno = plinno; 816 for (;;) { /* until token or start of word found */ 817 c = pgetc_macro(); 818 switch (c) { 819 case ' ': case '\t': 820 continue; 821 case '#': 822 while ((c = pgetc()) != '\n' && c != PEOF); 823 pungetc(); 824 continue; 825 case '\\': 826 if (pgetc() == '\n') { 827 startlinno = ++plinno; 828 if (doprompt) 829 setprompt(2); 830 else 831 setprompt(0); 832 continue; 833 } 834 pungetc(); 835 goto breakloop; 836 case '\n': 837 plinno++; 838 needprompt = doprompt; 839 RETURN(TNL); 840 case PEOF: 841 RETURN(TEOF); 842 case '&': 843 if (pgetc() == '&') 844 RETURN(TAND); 845 pungetc(); 846 RETURN(TBACKGND); 847 case '|': 848 if (pgetc() == '|') 849 RETURN(TOR); 850 pungetc(); 851 RETURN(TPIPE); 852 case ';': 853 if (pgetc() == ';') 854 RETURN(TENDCASE); 855 pungetc(); 856 RETURN(TSEMI); 857 case '(': 858 RETURN(TLP); 859 case ')': 860 RETURN(TRP); 861 default: 862 goto breakloop; 863 } 864 } 865 breakloop: 866 return readtoken1(c, BASESYNTAX, NULL, 0); 867 #undef RETURN 868 } 869 870 871 872 /* 873 * If eofmark is NULL, read a word or a redirection symbol. If eofmark 874 * is not NULL, read a here document. In the latter case, eofmark is the 875 * word which marks the end of the document and striptabs is true if 876 * leading tabs should be stripped from the document. The argument firstc 877 * is the first character of the input token or document. 878 * 879 * Because C does not have internal subroutines, I have simulated them 880 * using goto's to implement the subroutine linkage. The following macros 881 * will run code that appears at the end of readtoken1. 882 */ 883 884 #define CHECKEND() {goto checkend; checkend_return:;} 885 #define PARSEREDIR() {goto parseredir; parseredir_return:;} 886 #define PARSESUB() {goto parsesub; parsesub_return:;} 887 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;} 888 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;} 889 #define PARSEARITH() {goto parsearith; parsearith_return:;} 890 891 /* 892 * Keep track of nested doublequotes in dblquote and doublequotep. 893 * We use dblquote for the first 32 levels, and we expand to a malloc'ed 894 * region for levels above that. Usually we never need to malloc. 895 * This code assumes that an int is 32 bits. We don't use uint32_t, 896 * because the rest of the code does not. 897 */ 898 #define ISDBLQUOTE() ((varnest < 32) ? (dblquote & (1 << varnest)) : \ 899 (dblquotep[(varnest / 32) - 1] & (1 << (varnest % 32)))) 900 901 #define SETDBLQUOTE() \ 902 if (varnest < 32) \ 903 dblquote |= (1 << varnest); \ 904 else \ 905 dblquotep[(varnest / 32) - 1] |= (1 << (varnest % 32)) 906 907 #define CLRDBLQUOTE() \ 908 if (varnest < 32) \ 909 dblquote &= ~(1 << varnest); \ 910 else \ 911 dblquotep[(varnest / 32) - 1] &= ~(1 << (varnest % 32)) 912 913 STATIC int 914 readtoken1(int firstc, char const *syn, char *eofmark, int striptabs) 915 { 916 char const * volatile syntax = syn; 917 int c = firstc; 918 char * volatile out; 919 int len; 920 char line[EOFMARKLEN + 1]; 921 struct nodelist *bqlist; 922 volatile int quotef; 923 int * volatile dblquotep = NULL; 924 volatile size_t maxnest = 32; 925 volatile int dblquote; 926 volatile size_t varnest; /* levels of variables expansion */ 927 volatile int arinest; /* levels of arithmetic expansion */ 928 volatile int parenlevel; /* levels of parens in arithmetic */ 929 volatile int oldstyle; 930 char const * volatile prevsyntax; /* syntax before arithmetic */ 931 #ifdef __GNUC__ 932 prevsyntax = NULL; /* XXX gcc4 */ 933 #endif 934 935 startlinno = plinno; 936 dblquote = 0; 937 varnest = 0; 938 if (syntax == DQSYNTAX) { 939 SETDBLQUOTE(); 940 } 941 quotef = 0; 942 bqlist = NULL; 943 arinest = 0; 944 parenlevel = 0; 945 946 STARTSTACKSTR(out); 947 loop: { /* for each line, until end of word */ 948 #if ATTY 949 if (c == '\034' && doprompt 950 && attyset() && ! equal(termval(), "emacs")) { 951 attyline(); 952 if (syntax == BASESYNTAX) 953 return readtoken(); 954 c = pgetc(); 955 goto loop; 956 } 957 #endif 958 CHECKEND(); /* set c to PEOF if at end of here document */ 959 for (;;) { /* until end of line or end of word */ 960 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */ 961 switch(syntax[c]) { 962 case CNL: /* '\n' */ 963 if (syntax == BASESYNTAX) 964 goto endword; /* exit outer loop */ 965 USTPUTC(c, out); 966 plinno++; 967 if (doprompt) 968 setprompt(2); 969 else 970 setprompt(0); 971 c = pgetc(); 972 goto loop; /* continue outer loop */ 973 case CWORD: 974 USTPUTC(c, out); 975 break; 976 case CCTL: 977 if (eofmark == NULL || ISDBLQUOTE()) 978 USTPUTC(CTLESC, out); 979 USTPUTC(c, out); 980 break; 981 case CBACK: /* backslash */ 982 c = pgetc(); 983 if (c == PEOF) { 984 USTPUTC('\\', out); 985 pungetc(); 986 break; 987 } 988 if (c == '\n') { 989 if (doprompt) 990 setprompt(2); 991 else 992 setprompt(0); 993 break; 994 } 995 quotef = 1; 996 if (ISDBLQUOTE() && c != '\\' && 997 c != '`' && c != '$' && 998 (c != '"' || eofmark != NULL)) 999 USTPUTC('\\', out); 1000 if (SQSYNTAX[c] == CCTL) 1001 USTPUTC(CTLESC, out); 1002 else if (eofmark == NULL) { 1003 USTPUTC(CTLQUOTEMARK, out); 1004 USTPUTC(c, out); 1005 if (varnest != 0) 1006 USTPUTC(CTLQUOTEEND, out); 1007 break; 1008 } 1009 USTPUTC(c, out); 1010 break; 1011 case CSQUOTE: 1012 if (syntax != SQSYNTAX) { 1013 if (eofmark == NULL) 1014 USTPUTC(CTLQUOTEMARK, out); 1015 quotef = 1; 1016 syntax = SQSYNTAX; 1017 break; 1018 } 1019 if (eofmark != NULL && arinest == 0 && 1020 varnest == 0) { 1021 /* Ignore inside quoted here document */ 1022 USTPUTC(c, out); 1023 break; 1024 } 1025 /* End of single quotes... */ 1026 if (arinest) 1027 syntax = ARISYNTAX; 1028 else { 1029 syntax = BASESYNTAX; 1030 if (varnest != 0) 1031 USTPUTC(CTLQUOTEEND, out); 1032 } 1033 break; 1034 case CDQUOTE: 1035 if (eofmark != NULL && arinest == 0 && 1036 varnest == 0) { 1037 /* Ignore inside here document */ 1038 USTPUTC(c, out); 1039 break; 1040 } 1041 quotef = 1; 1042 if (arinest) { 1043 if (ISDBLQUOTE()) { 1044 syntax = ARISYNTAX; 1045 CLRDBLQUOTE(); 1046 } else { 1047 syntax = DQSYNTAX; 1048 SETDBLQUOTE(); 1049 USTPUTC(CTLQUOTEMARK, out); 1050 } 1051 break; 1052 } 1053 if (eofmark != NULL) 1054 break; 1055 if (ISDBLQUOTE()) { 1056 if (varnest != 0) 1057 USTPUTC(CTLQUOTEEND, out); 1058 syntax = BASESYNTAX; 1059 CLRDBLQUOTE(); 1060 } else { 1061 syntax = DQSYNTAX; 1062 SETDBLQUOTE(); 1063 USTPUTC(CTLQUOTEMARK, out); 1064 } 1065 break; 1066 case CVAR: /* '$' */ 1067 PARSESUB(); /* parse substitution */ 1068 break; 1069 case CENDVAR: /* CLOSEBRACE */ 1070 if (varnest > 0 && !ISDBLQUOTE()) { 1071 varnest--; 1072 USTPUTC(CTLENDVAR, out); 1073 } else { 1074 USTPUTC(c, out); 1075 } 1076 break; 1077 case CLP: /* '(' in arithmetic */ 1078 parenlevel++; 1079 USTPUTC(c, out); 1080 break; 1081 case CRP: /* ')' in arithmetic */ 1082 if (parenlevel > 0) { 1083 USTPUTC(c, out); 1084 --parenlevel; 1085 } else { 1086 if (pgetc() == ')') { 1087 if (--arinest == 0) { 1088 USTPUTC(CTLENDARI, out); 1089 syntax = prevsyntax; 1090 if (syntax == DQSYNTAX) 1091 SETDBLQUOTE(); 1092 else 1093 CLRDBLQUOTE(); 1094 } else 1095 USTPUTC(')', out); 1096 } else { 1097 /* 1098 * unbalanced parens 1099 * (don't 2nd guess - no error) 1100 */ 1101 pungetc(); 1102 USTPUTC(')', out); 1103 } 1104 } 1105 break; 1106 case CBQUOTE: /* '`' */ 1107 PARSEBACKQOLD(); 1108 break; 1109 case CEOF: 1110 goto endword; /* exit outer loop */ 1111 default: 1112 if (varnest == 0 && !ISDBLQUOTE()) 1113 goto endword; /* exit outer loop */ 1114 USTPUTC(c, out); 1115 } 1116 c = pgetc_macro(); 1117 } 1118 } 1119 endword: 1120 if (syntax == ARISYNTAX) 1121 synerror("Missing '))'"); 1122 if (syntax != BASESYNTAX && /* ! parsebackquote && */ eofmark == NULL) 1123 synerror("Unterminated quoted string"); 1124 if (varnest != 0) { 1125 startlinno = plinno; 1126 /* { */ 1127 synerror("Missing '}'"); 1128 } 1129 USTPUTC('\0', out); 1130 len = out - stackblock(); 1131 out = stackblock(); 1132 if (eofmark == NULL) { 1133 if ((c == '>' || c == '<') 1134 && quotef == 0 1135 && len <= 2 1136 && (*out == '\0' || is_digit(*out))) { 1137 PARSEREDIR(); 1138 return lasttoken = TREDIR; 1139 } else { 1140 pungetc(); 1141 } 1142 } 1143 quoteflag = quotef; 1144 backquotelist = bqlist; 1145 grabstackblock(len); 1146 wordtext = out; 1147 if (dblquotep != NULL) 1148 ckfree(dblquotep); 1149 return lasttoken = TWORD; 1150 /* end of readtoken routine */ 1151 1152 1153 1154 /* 1155 * Check to see whether we are at the end of the here document. When this 1156 * is called, c is set to the first character of the next input line. If 1157 * we are at the end of the here document, this routine sets the c to PEOF. 1158 */ 1159 1160 checkend: { 1161 if (eofmark) { 1162 if (striptabs) { 1163 while (c == '\t') 1164 c = pgetc(); 1165 } 1166 if (c == *eofmark) { 1167 if (pfgets(line, sizeof line) != NULL) { 1168 char *p, *q; 1169 1170 p = line; 1171 for (q = eofmark + 1 ; *q && *p == *q ; p++, q++); 1172 if ((*p == '\0' || *p == '\n') && *q == '\0') { 1173 c = PEOF; 1174 plinno++; 1175 needprompt = doprompt; 1176 } else { 1177 pushstring(line, strlen(line), NULL); 1178 } 1179 } 1180 } 1181 } 1182 goto checkend_return; 1183 } 1184 1185 1186 /* 1187 * Parse a redirection operator. The variable "out" points to a string 1188 * specifying the fd to be redirected. The variable "c" contains the 1189 * first character of the redirection operator. 1190 */ 1191 1192 parseredir: { 1193 char fd = *out; 1194 union node *np; 1195 1196 np = (union node *)stalloc(sizeof (struct nfile)); 1197 if (c == '>') { 1198 np->nfile.fd = 1; 1199 c = pgetc(); 1200 if (c == '>') 1201 np->type = NAPPEND; 1202 else if (c == '|') 1203 np->type = NCLOBBER; 1204 else if (c == '&') 1205 np->type = NTOFD; 1206 else { 1207 np->type = NTO; 1208 pungetc(); 1209 } 1210 } else { /* c == '<' */ 1211 np->nfile.fd = 0; 1212 switch (c = pgetc()) { 1213 case '<': 1214 if (sizeof (struct nfile) != sizeof (struct nhere)) { 1215 np = (union node *)stalloc(sizeof (struct nhere)); 1216 np->nfile.fd = 0; 1217 } 1218 np->type = NHERE; 1219 heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc)); 1220 heredoc->here = np; 1221 if ((c = pgetc()) == '-') { 1222 heredoc->striptabs = 1; 1223 } else { 1224 heredoc->striptabs = 0; 1225 pungetc(); 1226 } 1227 break; 1228 1229 case '&': 1230 np->type = NFROMFD; 1231 break; 1232 1233 case '>': 1234 np->type = NFROMTO; 1235 break; 1236 1237 default: 1238 np->type = NFROM; 1239 pungetc(); 1240 break; 1241 } 1242 } 1243 if (fd != '\0') 1244 np->nfile.fd = digit_val(fd); 1245 redirnode = np; 1246 goto parseredir_return; 1247 } 1248 1249 1250 /* 1251 * Parse a substitution. At this point, we have read the dollar sign 1252 * and nothing else. 1253 */ 1254 1255 parsesub: { 1256 int subtype; 1257 int typeloc; 1258 int flags; 1259 char *p; 1260 static const char types[] = "}-+?="; 1261 1262 c = pgetc(); 1263 if (c != '(' && c != OPENBRACE && !is_name(c) && !is_special(c)) { 1264 USTPUTC('$', out); 1265 pungetc(); 1266 } else if (c == '(') { /* $(command) or $((arith)) */ 1267 if (pgetc() == '(') { 1268 PARSEARITH(); 1269 } else { 1270 pungetc(); 1271 PARSEBACKQNEW(); 1272 } 1273 } else { 1274 USTPUTC(CTLVAR, out); 1275 typeloc = out - stackblock(); 1276 USTPUTC(VSNORMAL, out); 1277 subtype = VSNORMAL; 1278 if (c == OPENBRACE) { 1279 c = pgetc(); 1280 if (c == '#') { 1281 if ((c = pgetc()) == CLOSEBRACE) 1282 c = '#'; 1283 else 1284 subtype = VSLENGTH; 1285 } 1286 else 1287 subtype = 0; 1288 } 1289 if (is_name(c)) { 1290 do { 1291 STPUTC(c, out); 1292 c = pgetc(); 1293 } while (is_in_name(c)); 1294 } else if (is_digit(c)) { 1295 do { 1296 USTPUTC(c, out); 1297 c = pgetc(); 1298 } while (is_digit(c)); 1299 } 1300 else if (is_special(c)) { 1301 USTPUTC(c, out); 1302 c = pgetc(); 1303 } 1304 else 1305 badsub: synerror("Bad substitution"); 1306 1307 STPUTC('=', out); 1308 flags = 0; 1309 if (subtype == 0) { 1310 switch (c) { 1311 case ':': 1312 flags = VSNUL; 1313 c = pgetc(); 1314 /*FALLTHROUGH*/ 1315 default: 1316 p = strchr(types, c); 1317 if (p == NULL) 1318 goto badsub; 1319 subtype = p - types + VSNORMAL; 1320 break; 1321 case '%': 1322 case '#': 1323 { 1324 int cc = c; 1325 subtype = c == '#' ? VSTRIMLEFT : 1326 VSTRIMRIGHT; 1327 c = pgetc(); 1328 if (c == cc) 1329 subtype++; 1330 else 1331 pungetc(); 1332 break; 1333 } 1334 } 1335 } else { 1336 pungetc(); 1337 } 1338 if (ISDBLQUOTE() || arinest) 1339 flags |= VSQUOTE; 1340 *(stackblock() + typeloc) = subtype | flags; 1341 if (subtype != VSNORMAL) { 1342 varnest++; 1343 if (varnest >= maxnest) { 1344 dblquotep = ckrealloc(dblquotep, maxnest / 8); 1345 dblquotep[(maxnest / 32) - 1] = 0; 1346 maxnest += 32; 1347 } 1348 } 1349 } 1350 goto parsesub_return; 1351 } 1352 1353 1354 /* 1355 * Called to parse command substitutions. Newstyle is set if the command 1356 * is enclosed inside $(...); nlpp is a pointer to the head of the linked 1357 * list of commands (passed by reference), and savelen is the number of 1358 * characters on the top of the stack which must be preserved. 1359 */ 1360 1361 parsebackq: { 1362 struct nodelist **nlpp; 1363 int savepbq; 1364 union node *n; 1365 char *volatile str = NULL; 1366 struct jmploc jmploc; 1367 struct jmploc *volatile savehandler = NULL; 1368 int savelen; 1369 int saveprompt; 1370 1371 savepbq = parsebackquote; 1372 if (setjmp(jmploc.loc)) { 1373 if (str) 1374 ckfree(str); 1375 parsebackquote = 0; 1376 handler = savehandler; 1377 longjmp(handler->loc, 1); 1378 } 1379 INTOFF; 1380 str = NULL; 1381 savelen = out - stackblock(); 1382 if (savelen > 0) { 1383 str = ckmalloc(savelen); 1384 memcpy(str, stackblock(), savelen); 1385 } 1386 savehandler = handler; 1387 handler = &jmploc; 1388 INTON; 1389 if (oldstyle) { 1390 /* We must read until the closing backquote, giving special 1391 treatment to some slashes, and then push the string and 1392 reread it as input, interpreting it normally. */ 1393 char *pout; 1394 int pc; 1395 int psavelen; 1396 char *pstr; 1397 1398 1399 STARTSTACKSTR(pout); 1400 for (;;) { 1401 if (needprompt) { 1402 setprompt(2); 1403 needprompt = 0; 1404 } 1405 switch (pc = pgetc()) { 1406 case '`': 1407 goto done; 1408 1409 case '\\': 1410 if ((pc = pgetc()) == '\n') { 1411 plinno++; 1412 if (doprompt) 1413 setprompt(2); 1414 else 1415 setprompt(0); 1416 /* 1417 * If eating a newline, avoid putting 1418 * the newline into the new character 1419 * stream (via the STPUTC after the 1420 * switch). 1421 */ 1422 continue; 1423 } 1424 if (pc != '\\' && pc != '`' && pc != '$' 1425 && (!ISDBLQUOTE() || pc != '"')) 1426 STPUTC('\\', pout); 1427 break; 1428 1429 case '\n': 1430 plinno++; 1431 needprompt = doprompt; 1432 break; 1433 1434 case PEOF: 1435 startlinno = plinno; 1436 synerror("EOF in backquote substitution"); 1437 break; 1438 1439 default: 1440 break; 1441 } 1442 STPUTC(pc, pout); 1443 } 1444 done: 1445 STPUTC('\0', pout); 1446 psavelen = pout - stackblock(); 1447 if (psavelen > 0) { 1448 pstr = grabstackstr(pout); 1449 setinputstring(pstr, 1); 1450 } 1451 } 1452 nlpp = &bqlist; 1453 while (*nlpp) 1454 nlpp = &(*nlpp)->next; 1455 *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 1456 (*nlpp)->next = NULL; 1457 parsebackquote = oldstyle; 1458 1459 if (oldstyle) { 1460 saveprompt = doprompt; 1461 doprompt = 0; 1462 } else 1463 saveprompt = 0; 1464 1465 n = list(0, oldstyle); 1466 1467 if (oldstyle) 1468 doprompt = saveprompt; 1469 else { 1470 if (readtoken() != TRP) 1471 synexpect(TRP); 1472 } 1473 1474 (*nlpp)->n = n; 1475 if (oldstyle) { 1476 /* 1477 * Start reading from old file again, ignoring any pushed back 1478 * tokens left from the backquote parsing 1479 */ 1480 popfile(); 1481 tokpushback = 0; 1482 } 1483 while (stackblocksize() <= savelen) 1484 growstackblock(); 1485 STARTSTACKSTR(out); 1486 if (str) { 1487 memcpy(out, str, savelen); 1488 STADJUST(savelen, out); 1489 INTOFF; 1490 ckfree(str); 1491 str = NULL; 1492 INTON; 1493 } 1494 parsebackquote = savepbq; 1495 handler = savehandler; 1496 if (arinest || ISDBLQUOTE()) 1497 USTPUTC(CTLBACKQ | CTLQUOTE, out); 1498 else 1499 USTPUTC(CTLBACKQ, out); 1500 if (oldstyle) 1501 goto parsebackq_oldreturn; 1502 else 1503 goto parsebackq_newreturn; 1504 } 1505 1506 /* 1507 * Parse an arithmetic expansion (indicate start of one and set state) 1508 */ 1509 parsearith: { 1510 1511 if (++arinest == 1) { 1512 prevsyntax = syntax; 1513 syntax = ARISYNTAX; 1514 USTPUTC(CTLARI, out); 1515 if (ISDBLQUOTE()) 1516 USTPUTC('"',out); 1517 else 1518 USTPUTC(' ',out); 1519 } else { 1520 /* 1521 * we collapse embedded arithmetic expansion to 1522 * parenthesis, which should be equivalent 1523 */ 1524 USTPUTC('(', out); 1525 } 1526 goto parsearith_return; 1527 } 1528 1529 } /* end of readtoken */ 1530 1531 1532 1533 #ifdef mkinit 1534 RESET { 1535 tokpushback = 0; 1536 checkkwd = 0; 1537 } 1538 #endif 1539 1540 /* 1541 * Returns true if the text contains nothing to expand (no dollar signs 1542 * or backquotes). 1543 */ 1544 1545 STATIC int 1546 noexpand(char *text) 1547 { 1548 char *p; 1549 char c; 1550 1551 p = text; 1552 while ((c = *p++) != '\0') { 1553 if (c == CTLQUOTEMARK) 1554 continue; 1555 if (c == CTLESC) 1556 p++; 1557 else if (BASESYNTAX[(int)c] == CCTL) 1558 return 0; 1559 } 1560 return 1; 1561 } 1562 1563 1564 /* 1565 * Return true if the argument is a legal variable name (a letter or 1566 * underscore followed by zero or more letters, underscores, and digits). 1567 */ 1568 1569 int 1570 goodname(char *name) 1571 { 1572 char *p; 1573 1574 p = name; 1575 if (! is_name(*p)) 1576 return 0; 1577 while (*++p) { 1578 if (! is_in_name(*p)) 1579 return 0; 1580 } 1581 return 1; 1582 } 1583 1584 1585 /* 1586 * Called when an unexpected token is read during the parse. The argument 1587 * is the token that is expected, or -1 if more than one type of token can 1588 * occur at this point. 1589 */ 1590 1591 STATIC void 1592 synexpect(int token) 1593 { 1594 char msg[64]; 1595 1596 if (token >= 0) { 1597 fmtstr(msg, 64, "%s unexpected (expecting %s)", 1598 tokname[lasttoken], tokname[token]); 1599 } else { 1600 fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]); 1601 } 1602 synerror(msg); 1603 /* NOTREACHED */ 1604 } 1605 1606 1607 STATIC void 1608 synerror(const char *msg) 1609 { 1610 if (commandname) 1611 outfmt(&errout, "%s: %d: ", commandname, startlinno); 1612 else 1613 outfmt(&errout, "%s: ", getprogname()); 1614 outfmt(&errout, "Syntax error: %s\n", msg); 1615 error(NULL); 1616 /* NOTREACHED */ 1617 } 1618 1619 STATIC void 1620 setprompt(int which) 1621 { 1622 whichprompt = which; 1623 1624 #ifndef SMALL 1625 if (!el) 1626 #endif 1627 out2str(getprompt(NULL)); 1628 } 1629 1630 /* 1631 * called by editline -- any expansions to the prompt 1632 * should be added here. 1633 */ 1634 const char * 1635 getprompt(void *unused) 1636 { 1637 switch (whichprompt) { 1638 case 0: 1639 return ""; 1640 case 1: 1641 return ps1val(); 1642 case 2: 1643 return ps2val(); 1644 default: 1645 return "<internal prompt error>"; 1646 } 1647 } 1648