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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)exec.c 8.4 (Berkeley) 6/8/95"; 40 #endif 41 static const char rcsid[] = 42 "$FreeBSD$"; 43 #endif /* not lint */ 44 45 #include <sys/types.h> 46 #include <sys/stat.h> 47 #include <unistd.h> 48 #include <fcntl.h> 49 #include <errno.h> 50 #include <stdlib.h> 51 52 /* 53 * When commands are first encountered, they are entered in a hash table. 54 * This ensures that a full path search will not have to be done for them 55 * on each invocation. 56 * 57 * We should investigate converting to a linear search, even though that 58 * would make the command name "hash" a misnomer. 59 */ 60 61 #include "shell.h" 62 #include "main.h" 63 #include "nodes.h" 64 #include "parser.h" 65 #include "redir.h" 66 #include "eval.h" 67 #include "exec.h" 68 #include "builtins.h" 69 #include "var.h" 70 #include "options.h" 71 #include "input.h" 72 #include "output.h" 73 #include "syntax.h" 74 #include "memalloc.h" 75 #include "error.h" 76 #include "init.h" 77 #include "mystring.h" 78 #include "show.h" 79 #include "jobs.h" 80 #include "alias.h" 81 82 83 #define CMDTABLESIZE 31 /* should be prime */ 84 #define ARB 1 /* actual size determined at run time */ 85 86 87 88 struct tblentry { 89 struct tblentry *next; /* next entry in hash chain */ 90 union param param; /* definition of builtin function */ 91 short cmdtype; /* index identifying command */ 92 char rehash; /* if set, cd done since entry created */ 93 char cmdname[ARB]; /* name of command */ 94 }; 95 96 97 STATIC struct tblentry *cmdtable[CMDTABLESIZE]; 98 STATIC int builtinloc = -1; /* index in path of %builtin, or -1 */ 99 int exerrno = 0; /* Last exec error */ 100 101 102 STATIC void tryexec __P((char *, char **, char **)); 103 #ifndef BSD 104 STATIC void execinterp __P((char **, char **)); 105 #endif 106 STATIC void printentry __P((struct tblentry *, int)); 107 STATIC struct tblentry *cmdlookup __P((char *, int)); 108 STATIC void delete_cmd_entry __P((void)); 109 110 111 112 /* 113 * Exec a program. Never returns. If you change this routine, you may 114 * have to change the find_command routine as well. 115 */ 116 117 void 118 shellexec(argv, envp, path, index) 119 char **argv, **envp; 120 char *path; 121 int index; 122 { 123 char *cmdname; 124 int e; 125 126 if (strchr(argv[0], '/') != NULL) { 127 tryexec(argv[0], argv, envp); 128 e = errno; 129 } else { 130 e = ENOENT; 131 while ((cmdname = padvance(&path, argv[0])) != NULL) { 132 if (--index < 0 && pathopt == NULL) { 133 tryexec(cmdname, argv, envp); 134 if (errno != ENOENT && errno != ENOTDIR) 135 e = errno; 136 } 137 stunalloc(cmdname); 138 } 139 } 140 141 /* Map to POSIX errors */ 142 switch (e) { 143 case EACCES: 144 exerrno = 126; 145 break; 146 case ENOENT: 147 exerrno = 127; 148 break; 149 default: 150 exerrno = 2; 151 break; 152 } 153 exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC)); 154 } 155 156 157 STATIC void 158 tryexec(cmd, argv, envp) 159 char *cmd; 160 char **argv; 161 char **envp; 162 { 163 int e; 164 #ifndef BSD 165 char *p; 166 #endif 167 168 #ifdef SYSV 169 do { 170 execve(cmd, argv, envp); 171 } while (errno == EINTR); 172 #else 173 execve(cmd, argv, envp); 174 #endif 175 e = errno; 176 if (e == ENOEXEC) { 177 initshellproc(); 178 setinputfile(cmd, 0); 179 commandname = arg0 = savestr(argv[0]); 180 #ifndef BSD 181 pgetc(); pungetc(); /* fill up input buffer */ 182 p = parsenextc; 183 if (parsenleft > 2 && p[0] == '#' && p[1] == '!') { 184 argv[0] = cmd; 185 execinterp(argv, envp); 186 } 187 #endif 188 setparam(argv + 1); 189 exraise(EXSHELLPROC); 190 /*NOTREACHED*/ 191 } 192 errno = e; 193 } 194 195 196 #ifndef BSD 197 /* 198 * Execute an interpreter introduced by "#!", for systems where this 199 * feature has not been built into the kernel. If the interpreter is 200 * the shell, return (effectively ignoring the "#!"). If the execution 201 * of the interpreter fails, exit. 202 * 203 * This code peeks inside the input buffer in order to avoid actually 204 * reading any input. It would benefit from a rewrite. 205 */ 206 207 #define NEWARGS 5 208 209 STATIC void 210 execinterp(argv, envp) 211 char **argv, **envp; 212 { 213 int n; 214 char *inp; 215 char *outp; 216 char c; 217 char *p; 218 char **ap; 219 char *newargs[NEWARGS]; 220 int i; 221 char **ap2; 222 char **new; 223 224 n = parsenleft - 2; 225 inp = parsenextc + 2; 226 ap = newargs; 227 for (;;) { 228 while (--n >= 0 && (*inp == ' ' || *inp == '\t')) 229 inp++; 230 if (n < 0) 231 goto bad; 232 if ((c = *inp++) == '\n') 233 break; 234 if (ap == &newargs[NEWARGS]) 235 bad: error("Bad #! line"); 236 STARTSTACKSTR(outp); 237 do { 238 STPUTC(c, outp); 239 } while (--n >= 0 && (c = *inp++) != ' ' && c != '\t' && c != '\n'); 240 STPUTC('\0', outp); 241 n++, inp--; 242 *ap++ = grabstackstr(outp); 243 } 244 if (ap == newargs + 1) { /* if no args, maybe no exec is needed */ 245 p = newargs[0]; 246 for (;;) { 247 if (equal(p, "sh") || equal(p, "ash")) { 248 return; 249 } 250 while (*p != '/') { 251 if (*p == '\0') 252 goto break2; 253 p++; 254 } 255 p++; 256 } 257 break2:; 258 } 259 i = (char *)ap - (char *)newargs; /* size in bytes */ 260 if (i == 0) 261 error("Bad #! line"); 262 for (ap2 = argv ; *ap2++ != NULL ; ); 263 new = ckmalloc(i + ((char *)ap2 - (char *)argv)); 264 ap = newargs, ap2 = new; 265 while ((i -= sizeof (char **)) >= 0) 266 *ap2++ = *ap++; 267 ap = argv; 268 while (*ap2++ = *ap++); 269 shellexec(new, envp, pathval(), 0); 270 } 271 #endif 272 273 274 275 /* 276 * Do a path search. The variable path (passed by reference) should be 277 * set to the start of the path before the first call; padvance will update 278 * this value as it proceeds. Successive calls to padvance will return 279 * the possible path expansions in sequence. If an option (indicated by 280 * a percent sign) appears in the path entry then the global variable 281 * pathopt will be set to point to it; otherwise pathopt will be set to 282 * NULL. 283 */ 284 285 char *pathopt; 286 287 char * 288 padvance(path, name) 289 char **path; 290 char *name; 291 { 292 char *p, *q; 293 char *start; 294 int len; 295 296 if (*path == NULL) 297 return NULL; 298 start = *path; 299 for (p = start ; *p && *p != ':' && *p != '%' ; p++); 300 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */ 301 while (stackblocksize() < len) 302 growstackblock(); 303 q = stackblock(); 304 if (p != start) { 305 memcpy(q, start, p - start); 306 q += p - start; 307 *q++ = '/'; 308 } 309 strcpy(q, name); 310 pathopt = NULL; 311 if (*p == '%') { 312 pathopt = ++p; 313 while (*p && *p != ':') p++; 314 } 315 if (*p == ':') 316 *path = p + 1; 317 else 318 *path = NULL; 319 return stalloc(len); 320 } 321 322 323 324 /*** Command hashing code ***/ 325 326 327 int 328 hashcmd(argc, argv) 329 int argc __unused; 330 char **argv __unused; 331 { 332 struct tblentry **pp; 333 struct tblentry *cmdp; 334 int c; 335 int verbose; 336 struct cmdentry entry; 337 char *name; 338 339 verbose = 0; 340 while ((c = nextopt("rv")) != '\0') { 341 if (c == 'r') { 342 clearcmdentry(0); 343 } else if (c == 'v') { 344 verbose++; 345 } 346 } 347 if (*argptr == NULL) { 348 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) { 349 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) { 350 printentry(cmdp, verbose); 351 } 352 } 353 return 0; 354 } 355 while ((name = *argptr) != NULL) { 356 if ((cmdp = cmdlookup(name, 0)) != NULL 357 && (cmdp->cmdtype == CMDNORMAL 358 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))) 359 delete_cmd_entry(); 360 find_command(name, &entry, 1, pathval()); 361 if (verbose) { 362 if (entry.cmdtype != CMDUNKNOWN) { /* if no error msg */ 363 cmdp = cmdlookup(name, 0); 364 printentry(cmdp, verbose); 365 } 366 flushall(); 367 } 368 argptr++; 369 } 370 return 0; 371 } 372 373 374 STATIC void 375 printentry(cmdp, verbose) 376 struct tblentry *cmdp; 377 int verbose; 378 { 379 int index; 380 char *path; 381 char *name; 382 383 if (cmdp->cmdtype == CMDNORMAL) { 384 index = cmdp->param.index; 385 path = pathval(); 386 do { 387 name = padvance(&path, cmdp->cmdname); 388 stunalloc(name); 389 } while (--index >= 0); 390 out1str(name); 391 } else if (cmdp->cmdtype == CMDBUILTIN) { 392 out1fmt("builtin %s", cmdp->cmdname); 393 } else if (cmdp->cmdtype == CMDFUNCTION) { 394 out1fmt("function %s", cmdp->cmdname); 395 if (verbose) { 396 INTOFF; 397 name = commandtext(cmdp->param.func); 398 out1c(' '); 399 out1str(name); 400 ckfree(name); 401 INTON; 402 } 403 #ifdef DEBUG 404 } else { 405 error("internal error: cmdtype %d", cmdp->cmdtype); 406 #endif 407 } 408 if (cmdp->rehash) 409 out1c('*'); 410 out1c('\n'); 411 } 412 413 414 415 /* 416 * Resolve a command name. If you change this routine, you may have to 417 * change the shellexec routine as well. 418 */ 419 420 void 421 find_command(name, entry, printerr, path) 422 char *name; 423 struct cmdentry *entry; 424 int printerr; 425 char *path; 426 { 427 struct tblentry *cmdp; 428 int index; 429 int prev; 430 char *fullname; 431 struct stat statb; 432 int e; 433 int i; 434 435 /* If name contains a slash, don't use the hash table */ 436 if (strchr(name, '/') != NULL) { 437 entry->cmdtype = CMDNORMAL; 438 entry->u.index = 0; 439 return; 440 } 441 442 /* If name is in the table, and not invalidated by cd, we're done */ 443 if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0) 444 goto success; 445 446 /* If %builtin not in path, check for builtin next */ 447 if (builtinloc < 0 && (i = find_builtin(name)) >= 0) { 448 INTOFF; 449 cmdp = cmdlookup(name, 1); 450 cmdp->cmdtype = CMDBUILTIN; 451 cmdp->param.index = i; 452 INTON; 453 goto success; 454 } 455 456 /* We have to search path. */ 457 prev = -1; /* where to start */ 458 if (cmdp) { /* doing a rehash */ 459 if (cmdp->cmdtype == CMDBUILTIN) 460 prev = builtinloc; 461 else 462 prev = cmdp->param.index; 463 } 464 465 e = ENOENT; 466 index = -1; 467 loop: 468 while ((fullname = padvance(&path, name)) != NULL) { 469 stunalloc(fullname); 470 index++; 471 if (pathopt) { 472 if (prefix("builtin", pathopt)) { 473 if ((i = find_builtin(name)) < 0) 474 goto loop; 475 INTOFF; 476 cmdp = cmdlookup(name, 1); 477 cmdp->cmdtype = CMDBUILTIN; 478 cmdp->param.index = i; 479 INTON; 480 goto success; 481 } else if (prefix("func", pathopt)) { 482 /* handled below */ 483 } else { 484 goto loop; /* ignore unimplemented options */ 485 } 486 } 487 /* if rehash, don't redo absolute path names */ 488 if (fullname[0] == '/' && index <= prev) { 489 if (index < prev) 490 goto loop; 491 TRACE(("searchexec \"%s\": no change\n", name)); 492 goto success; 493 } 494 while (stat(fullname, &statb) < 0) { 495 #ifdef SYSV 496 if (errno == EINTR) 497 continue; 498 #endif 499 if (errno != ENOENT && errno != ENOTDIR) 500 e = errno; 501 goto loop; 502 } 503 e = EACCES; /* if we fail, this will be the error */ 504 if (!S_ISREG(statb.st_mode)) 505 goto loop; 506 if (pathopt) { /* this is a %func directory */ 507 stalloc(strlen(fullname) + 1); 508 readcmdfile(fullname); 509 if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION) 510 error("%s not defined in %s", name, fullname); 511 stunalloc(fullname); 512 goto success; 513 } 514 #ifdef notdef 515 if (statb.st_uid == geteuid()) { 516 if ((statb.st_mode & 0100) == 0) 517 goto loop; 518 } else if (statb.st_gid == getegid()) { 519 if ((statb.st_mode & 010) == 0) 520 goto loop; 521 } else { 522 if ((statb.st_mode & 01) == 0) 523 goto loop; 524 } 525 #endif 526 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname)); 527 INTOFF; 528 cmdp = cmdlookup(name, 1); 529 cmdp->cmdtype = CMDNORMAL; 530 cmdp->param.index = index; 531 INTON; 532 goto success; 533 } 534 535 /* We failed. If there was an entry for this command, delete it */ 536 if (cmdp) 537 delete_cmd_entry(); 538 if (printerr) 539 outfmt(out2, "%s: %s\n", name, errmsg(e, E_EXEC)); 540 entry->cmdtype = CMDUNKNOWN; 541 return; 542 543 success: 544 cmdp->rehash = 0; 545 entry->cmdtype = cmdp->cmdtype; 546 entry->u = cmdp->param; 547 } 548 549 550 551 /* 552 * Search the table of builtin commands. 553 */ 554 555 int 556 find_builtin(name) 557 char *name; 558 { 559 const struct builtincmd *bp; 560 561 for (bp = builtincmd ; bp->name ; bp++) { 562 if (*bp->name == *name && equal(bp->name, name)) 563 return bp->code; 564 } 565 return -1; 566 } 567 568 569 570 /* 571 * Called when a cd is done. Marks all commands so the next time they 572 * are executed they will be rehashed. 573 */ 574 575 void 576 hashcd() { 577 struct tblentry **pp; 578 struct tblentry *cmdp; 579 580 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) { 581 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) { 582 if (cmdp->cmdtype == CMDNORMAL 583 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)) 584 cmdp->rehash = 1; 585 } 586 } 587 } 588 589 590 591 /* 592 * Called before PATH is changed. The argument is the new value of PATH; 593 * pathval() still returns the old value at this point. Called with 594 * interrupts off. 595 */ 596 597 void 598 changepath(newval) 599 const char *newval; 600 { 601 const char *old, *new; 602 int index; 603 int firstchange; 604 int bltin; 605 606 old = pathval(); 607 new = newval; 608 firstchange = 9999; /* assume no change */ 609 index = 0; 610 bltin = -1; 611 for (;;) { 612 if (*old != *new) { 613 firstchange = index; 614 if ((*old == '\0' && *new == ':') 615 || (*old == ':' && *new == '\0')) 616 firstchange++; 617 old = new; /* ignore subsequent differences */ 618 } 619 if (*new == '\0') 620 break; 621 if (*new == '%' && bltin < 0 && prefix("builtin", new + 1)) 622 bltin = index; 623 if (*new == ':') { 624 index++; 625 } 626 new++, old++; 627 } 628 if (builtinloc < 0 && bltin >= 0) 629 builtinloc = bltin; /* zap builtins */ 630 if (builtinloc >= 0 && bltin < 0) 631 firstchange = 0; 632 clearcmdentry(firstchange); 633 builtinloc = bltin; 634 } 635 636 637 /* 638 * Clear out command entries. The argument specifies the first entry in 639 * PATH which has changed. 640 */ 641 642 void 643 clearcmdentry(firstchange) 644 int firstchange; 645 { 646 struct tblentry **tblp; 647 struct tblentry **pp; 648 struct tblentry *cmdp; 649 650 INTOFF; 651 for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) { 652 pp = tblp; 653 while ((cmdp = *pp) != NULL) { 654 if ((cmdp->cmdtype == CMDNORMAL && 655 cmdp->param.index >= firstchange) 656 || (cmdp->cmdtype == CMDBUILTIN && 657 builtinloc >= firstchange)) { 658 *pp = cmdp->next; 659 ckfree(cmdp); 660 } else { 661 pp = &cmdp->next; 662 } 663 } 664 } 665 INTON; 666 } 667 668 669 /* 670 * Delete all functions. 671 */ 672 673 #ifdef mkinit 674 MKINIT void deletefuncs(); 675 676 SHELLPROC { 677 deletefuncs(); 678 } 679 #endif 680 681 void 682 deletefuncs() { 683 struct tblentry **tblp; 684 struct tblentry **pp; 685 struct tblentry *cmdp; 686 687 INTOFF; 688 for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) { 689 pp = tblp; 690 while ((cmdp = *pp) != NULL) { 691 if (cmdp->cmdtype == CMDFUNCTION) { 692 *pp = cmdp->next; 693 freefunc(cmdp->param.func); 694 ckfree(cmdp); 695 } else { 696 pp = &cmdp->next; 697 } 698 } 699 } 700 INTON; 701 } 702 703 704 705 /* 706 * Locate a command in the command hash table. If "add" is nonzero, 707 * add the command to the table if it is not already present. The 708 * variable "lastcmdentry" is set to point to the address of the link 709 * pointing to the entry, so that delete_cmd_entry can delete the 710 * entry. 711 */ 712 713 struct tblentry **lastcmdentry; 714 715 716 STATIC struct tblentry * 717 cmdlookup(name, add) 718 char *name; 719 int add; 720 { 721 int hashval; 722 char *p; 723 struct tblentry *cmdp; 724 struct tblentry **pp; 725 726 p = name; 727 hashval = *p << 4; 728 while (*p) 729 hashval += *p++; 730 hashval &= 0x7FFF; 731 pp = &cmdtable[hashval % CMDTABLESIZE]; 732 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) { 733 if (equal(cmdp->cmdname, name)) 734 break; 735 pp = &cmdp->next; 736 } 737 if (add && cmdp == NULL) { 738 INTOFF; 739 cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB 740 + strlen(name) + 1); 741 cmdp->next = NULL; 742 cmdp->cmdtype = CMDUNKNOWN; 743 cmdp->rehash = 0; 744 strcpy(cmdp->cmdname, name); 745 INTON; 746 } 747 lastcmdentry = pp; 748 return cmdp; 749 } 750 751 /* 752 * Delete the command entry returned on the last lookup. 753 */ 754 755 STATIC void 756 delete_cmd_entry() { 757 struct tblentry *cmdp; 758 759 INTOFF; 760 cmdp = *lastcmdentry; 761 *lastcmdentry = cmdp->next; 762 ckfree(cmdp); 763 INTON; 764 } 765 766 767 768 #ifdef notdef 769 void 770 getcmdentry(name, entry) 771 char *name; 772 struct cmdentry *entry; 773 { 774 struct tblentry *cmdp = cmdlookup(name, 0); 775 776 if (cmdp) { 777 entry->u = cmdp->param; 778 entry->cmdtype = cmdp->cmdtype; 779 } else { 780 entry->cmdtype = CMDUNKNOWN; 781 entry->u.index = 0; 782 } 783 } 784 #endif 785 786 787 /* 788 * Add a new command entry, replacing any existing command entry for 789 * the same name. 790 */ 791 792 void 793 addcmdentry(name, entry) 794 char *name; 795 struct cmdentry *entry; 796 { 797 struct tblentry *cmdp; 798 799 INTOFF; 800 cmdp = cmdlookup(name, 1); 801 if (cmdp->cmdtype == CMDFUNCTION) { 802 freefunc(cmdp->param.func); 803 } 804 cmdp->cmdtype = entry->cmdtype; 805 cmdp->param = entry->u; 806 INTON; 807 } 808 809 810 /* 811 * Define a shell function. 812 */ 813 814 void 815 defun(name, func) 816 char *name; 817 union node *func; 818 { 819 struct cmdentry entry; 820 821 INTOFF; 822 entry.cmdtype = CMDFUNCTION; 823 entry.u.func = copyfunc(func); 824 addcmdentry(name, &entry); 825 INTON; 826 } 827 828 829 /* 830 * Delete a function if it exists. 831 */ 832 833 int 834 unsetfunc(name) 835 char *name; 836 { 837 struct tblentry *cmdp; 838 839 if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) { 840 freefunc(cmdp->param.func); 841 delete_cmd_entry(); 842 return (0); 843 } 844 return (1); 845 } 846 847 /* 848 * Locate and print what a word is... 849 */ 850 851 int 852 typecmd(argc, argv) 853 int argc; 854 char **argv; 855 { 856 struct cmdentry entry; 857 struct tblentry *cmdp; 858 char **pp; 859 struct alias *ap; 860 int i; 861 int error = 0; 862 extern char *const parsekwd[]; 863 864 for (i = 1; i < argc; i++) { 865 out1str(argv[i]); 866 /* First look at the keywords */ 867 for (pp = (char **)parsekwd; *pp; pp++) 868 if (**pp == *argv[i] && equal(*pp, argv[i])) 869 break; 870 871 if (*pp) { 872 out1str(" is a shell keyword\n"); 873 continue; 874 } 875 876 /* Then look at the aliases */ 877 if ((ap = lookupalias(argv[i], 1)) != NULL) { 878 out1fmt(" is an alias for %s\n", ap->val); 879 continue; 880 } 881 882 /* Then check if it is a tracked alias */ 883 if ((cmdp = cmdlookup(argv[i], 0)) != NULL) { 884 entry.cmdtype = cmdp->cmdtype; 885 entry.u = cmdp->param; 886 } 887 else { 888 /* Finally use brute force */ 889 find_command(argv[i], &entry, 0, pathval()); 890 } 891 892 switch (entry.cmdtype) { 893 case CMDNORMAL: { 894 if (strchr(argv[i], '/') == NULL) { 895 char *path = pathval(), *name; 896 int j = entry.u.index; 897 do { 898 name = padvance(&path, argv[i]); 899 stunalloc(name); 900 } while (--j >= 0); 901 out1fmt(" is%s %s\n", 902 cmdp ? " a tracked alias for" : "", name); 903 } else { 904 if (access(argv[i], X_OK) == 0) 905 out1fmt(" is %s\n", argv[i]); 906 else 907 out1fmt(": %s\n", strerror(errno)); 908 } 909 break; 910 } 911 case CMDFUNCTION: 912 out1str(" is a shell function\n"); 913 break; 914 915 case CMDBUILTIN: 916 out1str(" is a shell builtin\n"); 917 break; 918 919 default: 920 out1str(": not found\n"); 921 error |= 127; 922 break; 923 } 924 } 925 return error; 926 } 927