commands/ash/exec.c

   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[] = "@(#)exec.c      8.4 (Berkeley) 6/8/95";
  36 #endif
  37 #endif /* not lint */
  38 #include <sys/cdefs.h>
  39 /*
  40 __FBSDID("$FreeBSD: src/bin/sh/exec.c,v 1.24.2.1 2004/09/30 04:41:55 des Exp $");
  41 */
  42
  43 #include <sys/types.h>
  44 #include <sys/stat.h>
  45 #include <unistd.h>
  46 #include <fcntl.h>
  47 #include <errno.h>
  48 #include <stdlib.h>
  49
  50 /*
  51  * When commands are first encountered, they are entered in a hash table.
  52  * This ensures that a full path search will not have to be done for them
  53  * on each invocation.
  54  *
  55  * We should investigate converting to a linear search, even though that
  56  * would make the command name "hash" a misnomer.
  57  */
  58
  59 #include "shell.h"
  60 #include "main.h"
  61 #include "nodes.h"
  62 #include "parser.h"
  63 #include "redir.h"
  64 #include "eval.h"
  65 #include "exec.h"
  66 #include "builtins.h"
  67 #include "var.h"
  68 #include "options.h"
  69 #include "input.h"
  70 #include "output.h"
  71 #include "syntax.h"
  72 #include "memalloc.h"
  73 #include "error.h"
  74 #include "init.h"
  75 #include "mystring.h"
  76 #include "show.h"
  77 #include "jobs.h"
  78 #include "alias.h"
  79
  80
  81 #define CMDTABLESIZE 31         /* should be prime */
  82 #define ARB 1                   /* actual size determined at run time */
  83
  84
  85
  86 struct tblentry {
  87         struct tblentry *next;  /* next entry in hash chain */
  88         union param param;      /* definition of builtin function */
  89         short cmdtype;          /* index identifying command */
  90         char rehash;            /* if set, cd done since entry created */
  91         char cmdname[ARB];      /* name of command */
  92 };
  93
  94
  95 STATIC struct tblentry *cmdtable[CMDTABLESIZE];
  96 STATIC int builtinloc = -1;             /* index in path of %builtin, or -1 */
  97 int exerrno = 0;                        /* Last exec error */
  98
  99
 100 STATIC void tryexec(char *, char **, char **);
 101 STATIC void printentry(struct tblentry *, int);
 102 STATIC struct tblentry *cmdlookup(char *, int);
 103 STATIC void delete_cmd_entry(void);
 104 STATIC void addcmdentry(char *, struct cmdentry *);
 105
 106
 107
 108 /*
 109  * Exec a program.  Never returns.  If you change this routine, you may
 110  * have to change the find_command routine as well.
 111  */
 112
 113 void
 114 shellexec(char **argv, char **envp, char *path, int index)
 115 {
 116         char *cmdname;
 117         int e;
 118
 119         if (strchr(argv[0], '/') != NULL) {
 120                 tryexec(argv[0], argv, envp);
 121                 e = errno;
 122         } else {
 123                 e = ENOENT;
 124                 while ((cmdname = padvance(&path, argv[0])) != NULL) {
 125                         if (--index < 0 && pathopt == NULL) {
 126                                 tryexec(cmdname, argv, envp);
 127                                 if (errno != ENOENT && errno != ENOTDIR)
 128                                         e = errno;
 129                         }
 130                         stunalloc(cmdname);
 131                 }
 132         }
 133
 134         /* Map to POSIX errors */
 135         switch (e) {
 136         case EACCES:
 137                 exerrno = 126;
 138                 break;
 139         case ENOENT:
 140                 exerrno = 127;
 141                 break;
 142         default:
 143                 exerrno = 2;
 144                 break;
 145         }
 146         if (e == ENOENT || e == ENOTDIR)
 147                 exerror(EXEXEC, "%s: not found", argv[0]);
 148         exerror(EXEXEC, "%s: %s", argv[0], strerror(e));
 149 }
 150
 151
 152 STATIC void
 153 tryexec(char *cmd, char **argv, char **envp)
 154 {
 155         int e;
 156
 157         execve(cmd, argv, envp);
 158
 159         e = errno;
 160         if (e == ENOEXEC) {
 161                 initshellproc();
 162                 setinputfile(cmd, 0);
 163                 commandname = arg0 = savestr(argv[0]);
 164                 setparam(argv + 1);
 165                 exraise(EXSHELLPROC);
 166                 /*NOTREACHED*/
 167         }
 168         errno = e;
 169 }
 170
 171 /*
 172  * Do a path search.  The variable path (passed by reference) should be
 173  * set to the start of the path before the first call; padvance will update
 174  * this value as it proceeds.  Successive calls to padvance will return
 175  * the possible path expansions in sequence.  If an option (indicated by
 176  * a percent sign) appears in the path entry then the global variable
 177  * pathopt will be set to point to it; otherwise pathopt will be set to
 178  * NULL.
 179  */
 180
 181 char *pathopt;
 182
 183 char *
 184 padvance(char **path, char *name)
 185 {
 186         char *p, *q;
 187         char *start;
 188         int len;
 189
 190         if (*path == NULL)
 191                 return NULL;
 192         start = *path;
 193         for (p = start ; *p && *p != ':' && *p != '%' ; p++);
 194         len = p - start + strlen(name) + 2;     /* "2" is for '/' and '\0' */
 195         while (stackblocksize() < len)
 196                 growstackblock();
 197         q = stackblock();
 198         if (p != start) {
 199                 memcpy(q, start, p - start);
 200                 q += p - start;
 201                 *q++ = '/';
 202         }
 203         strcpy(q, name);
 204         pathopt = NULL;
 205         if (*p == '%') {
 206                 pathopt = ++p;
 207                 while (*p && *p != ':')  p++;
 208         }
 209         if (*p == ':')
 210                 *path = p + 1;
 211         else
 212                 *path = NULL;
 213         return stalloc(len);
 214 }
 215
 216
 217
 218 /*** Command hashing code ***/
 219
 220
 221 int
 222 hashcmd(int argc __unused, char **argv __unused)
 223 {
 224         struct tblentry **pp;
 225         struct tblentry *cmdp;
 226         int c;
 227         int verbose;
 228         struct cmdentry entry;
 229         char *name;
 230
 231         verbose = 0;
 232         while ((c = nextopt("rv")) != '\0') {
 233                 if (c == 'r') {
 234                         clearcmdentry(0);
 235                 } else if (c == 'v') {
 236                         verbose++;
 237                 }
 238         }
 239         if (*argptr == NULL) {
 240                 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
 241                         for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 242                                 if (cmdp->cmdtype == CMDNORMAL)
 243                                         printentry(cmdp, verbose);
 244                         }
 245                 }
 246                 return 0;
 247         }
 248         while ((name = *argptr) != NULL) {
 249                 if ((cmdp = cmdlookup(name, 0)) != NULL
 250                  && (cmdp->cmdtype == CMDNORMAL
 251                      || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
 252                         delete_cmd_entry();
 253                 find_command(name, &entry, 1, pathval());
 254                 if (verbose) {
 255                         if (entry.cmdtype != CMDUNKNOWN) {      /* if no error msg */
 256                                 cmdp = cmdlookup(name, 0);
 257                                 if (cmdp != NULL)
 258                                         printentry(cmdp, verbose);
 259                                 else
 260                                         outfmt(&errout, "%s: not found\n", name);
 261                         }
 262                         flushall();
 263                 }
 264                 argptr++;
 265         }
 266         return 0;
 267 }
 268
 269
 270 STATIC void
 271 printentry(struct tblentry *cmdp, int verbose)
 272 {
 273         int index;
 274         char *path;
 275         char *name;
 276
 277         if (cmdp->cmdtype == CMDNORMAL) {
 278                 index = cmdp->param.index;
 279                 path = pathval();
 280                 do {
 281                         name = padvance(&path, cmdp->cmdname);
 282                         stunalloc(name);
 283                 } while (--index >= 0);
 284                 out1str(name);
 285         } else if (cmdp->cmdtype == CMDBUILTIN) {
 286                 out1fmt("builtin %s", cmdp->cmdname);
 287         } else if (cmdp->cmdtype == CMDFUNCTION) {
 288                 out1fmt("function %s", cmdp->cmdname);
 289                 if (verbose) {
 290                         INTOFF;
 291                         name = commandtext(cmdp->param.func);
 292                         out1c(' ');
 293                         out1str(name);
 294                         ckfree(name);
 295                         INTON;
 296                 }
 297 #if DEBUG
 298         } else {
 299                 error("internal error: cmdtype %d", cmdp->cmdtype);
 300 #endif
 301         }
 302         if (cmdp->rehash)
 303                 out1c('*');
 304         out1c('\n');
 305 }
 306
 307
 308
 309 /*
 310  * Resolve a command name.  If you change this routine, you may have to
 311  * change the shellexec routine as well.
 312  */
 313
 314 void
 315 find_command(char *name, struct cmdentry *entry, int printerr, char *path)
 316 {
 317         struct tblentry *cmdp;
 318         int index;
 319         int prev;
 320         char *fullname;
 321         struct stat statb;
 322         int e;
 323         int i;
 324
 325         /* If name contains a slash, don't use the hash table */
 326         if (strchr(name, '/') != NULL) {
 327                 entry->cmdtype = CMDNORMAL;
 328                 entry->u.index = 0;
 329                 return;
 330         }
 331
 332         /* If name is in the table, and not invalidated by cd, we're done */
 333         if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0)
 334                 goto success;
 335
 336         /* If %builtin not in path, check for builtin next */
 337         if (builtinloc < 0 && (i = find_builtin(name)) >= 0) {
 338                 INTOFF;
 339                 cmdp = cmdlookup(name, 1);
 340                 cmdp->cmdtype = CMDBUILTIN;
 341                 cmdp->param.index = i;
 342                 INTON;
 343                 goto success;
 344         }
 345
 346         /* We have to search path. */
 347         prev = -1;              /* where to start */
 348         if (cmdp) {             /* doing a rehash */
 349                 if (cmdp->cmdtype == CMDBUILTIN)
 350                         prev = builtinloc;
 351                 else
 352                         prev = cmdp->param.index;
 353         }
 354
 355         e = ENOENT;
 356         index = -1;
 357 loop:
 358         while ((fullname = padvance(&path, name)) != NULL) {
 359                 stunalloc(fullname);
 360                 index++;
 361                 if (pathopt) {
 362                         if (prefix("builtin", pathopt)) {
 363                                 if ((i = find_builtin(name)) < 0)
 364                                         goto loop;
 365                                 INTOFF;
 366                                 cmdp = cmdlookup(name, 1);
 367                                 cmdp->cmdtype = CMDBUILTIN;
 368                                 cmdp->param.index = i;
 369                                 INTON;
 370                                 goto success;
 371                         } else if (prefix("func", pathopt)) {
 372                                 /* handled below */
 373                         } else {
 374                                 goto loop;      /* ignore unimplemented options */
 375                         }
 376                 }
 377                 /* if rehash, don't redo absolute path names */
 378                 if (fullname[0] == '/' && index <= prev) {
 379                         if (index < prev)
 380                                 goto loop;
 381                         TRACE(("searchexec \"%s\": no change\n", name));
 382                         goto success;
 383                 }
 384                 if (stat(fullname, &statb) < 0) {
 385                         if (errno != ENOENT && errno != ENOTDIR)
 386                                 e = errno;
 387                         goto loop;
 388                 }
 389                 e = EACCES;     /* if we fail, this will be the error */
 390                 if (!S_ISREG(statb.st_mode))
 391                         goto loop;
 392                 if (pathopt) {          /* this is a %func directory */
 393                         stalloc(strlen(fullname) + 1);
 394                         readcmdfile(fullname);
 395                         if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION)
 396                                 error("%s not defined in %s", name, fullname);
 397                         stunalloc(fullname);
 398                         goto success;
 399                 }
 400 #ifdef notdef
 401                 if (statb.st_uid == geteuid()) {
 402                         if ((statb.st_mode & 0100) == 0)
 403                                 goto loop;
 404                 } else if (statb.st_gid == getegid()) {
 405                         if ((statb.st_mode & 010) == 0)
 406                                 goto loop;
 407                 } else {
 408                         if ((statb.st_mode & 01) == 0)
 409                                 goto loop;
 410                 }
 411 #endif
 412                 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
 413                 INTOFF;
 414                 cmdp = cmdlookup(name, 1);
 415                 cmdp->cmdtype = CMDNORMAL;
 416                 cmdp->param.index = index;
 417                 INTON;
 418                 goto success;
 419         }
 420
 421         /* We failed.  If there was an entry for this command, delete it */
 422         if (cmdp)
 423                 delete_cmd_entry();
 424         if (printerr) {
 425                 if (e == ENOENT || e == ENOTDIR)
 426                         outfmt(out2, "%s: not found\n", name);
 427                 else
 428                         outfmt(out2, "%s: %s\n", name, strerror(e));
 429         }
 430         entry->cmdtype = CMDUNKNOWN;
 431         return;
 432
 433 success:
 434         cmdp->rehash = 0;
 435         entry->cmdtype = cmdp->cmdtype;
 436         entry->u = cmdp->param;
 437 }
 438
 439
 440
 441 /*
 442  * Search the table of builtin commands.
 443  */
 444
 445 int
 446 find_builtin(char *name)
 447 {
 448         const struct builtincmd *bp;
 449
 450         for (bp = builtincmd ; bp->name ; bp++) {
 451                 if (*bp->name == *name && equal(bp->name, name))
 452                         return bp->code;
 453         }
 454         return -1;
 455 }
 456
 457
 458
 459 /*
 460  * Called when a cd is done.  Marks all commands so the next time they
 461  * are executed they will be rehashed.
 462  */
 463
 464 void
 465 hashcd(void)
 466 {
 467         struct tblentry **pp;
 468         struct tblentry *cmdp;
 469
 470         for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
 471                 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 472                         if (cmdp->cmdtype == CMDNORMAL
 473                          || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
 474                                 cmdp->rehash = 1;
 475                 }
 476         }
 477 }
 478
 479
 480
 481 /*
 482  * Called before PATH is changed.  The argument is the new value of PATH;
 483  * pathval() still returns the old value at this point.  Called with
 484  * interrupts off.
 485  */
 486
 487 void
 488 changepath(const char *newval)
 489 {
 490         const char *old, *new;
 491         int index;
 492         int firstchange;
 493         int bltin;
 494
 495         old = pathval();
 496         new = newval;
 497         firstchange = 9999;     /* assume no change */
 498         index = 0;
 499         bltin = -1;
 500         for (;;) {
 501                 if (*old != *new) {
 502                         firstchange = index;
 503                         if ((*old == '\0' && *new == ':')
 504                          || (*old == ':' && *new == '\0'))
 505                                 firstchange++;
 506                         old = new;      /* ignore subsequent differences */
 507                 }
 508                 if (*new == '\0')
 509                         break;
 510                 if (*new == '%' && bltin < 0 && prefix("builtin", new + 1))
 511                         bltin = index;
 512                 if (*new == ':') {
 513                         index++;
 514                 }
 515                 new++, old++;
 516         }
 517         if (builtinloc < 0 && bltin >= 0)
 518                 builtinloc = bltin;             /* zap builtins */
 519         if (builtinloc >= 0 && bltin < 0)
 520                 firstchange = 0;
 521         clearcmdentry(firstchange);
 522         builtinloc = bltin;
 523 }
 524
 525
 526 /*
 527  * Clear out command entries.  The argument specifies the first entry in
 528  * PATH which has changed.
 529  */
 530
 531 void
 532 clearcmdentry(int firstchange)
 533 {
 534         struct tblentry **tblp;
 535         struct tblentry **pp;
 536         struct tblentry *cmdp;
 537
 538         INTOFF;
 539         for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
 540                 pp = tblp;
 541                 while ((cmdp = *pp) != NULL) {
 542                         if ((cmdp->cmdtype == CMDNORMAL &&
 543                              cmdp->param.index >= firstchange)
 544                          || (cmdp->cmdtype == CMDBUILTIN &&
 545                              builtinloc >= firstchange)) {
 546                                 *pp = cmdp->next;
 547                                 ckfree(cmdp);
 548                         } else {
 549                                 pp = &cmdp->next;
 550                         }
 551                 }
 552         }
 553         INTON;
 554 }
 555
 556
 557 /*
 558  * Delete all functions.
 559  */
 560
 561 #ifdef mkinit
 562 INCLUDE "exec.h"
 563 SHELLPROC {
 564         deletefuncs();
 565 }
 566 #endif
 567
 568 void
 569 deletefuncs(void)
 570 {
 571         struct tblentry **tblp;
 572         struct tblentry **pp;
 573         struct tblentry *cmdp;
 574
 575         INTOFF;
 576         for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
 577                 pp = tblp;
 578                 while ((cmdp = *pp) != NULL) {
 579                         if (cmdp->cmdtype == CMDFUNCTION) {
 580                                 *pp = cmdp->next;
 581                                 freefunc(cmdp->param.func);
 582                                 ckfree(cmdp);
 583                         } else {
 584                                 pp = &cmdp->next;
 585                         }
 586                 }
 587         }
 588         INTON;
 589 }
 590
 591
 592
 593 /*
 594  * Locate a command in the command hash table.  If "add" is nonzero,
 595  * add the command to the table if it is not already present.  The
 596  * variable "lastcmdentry" is set to point to the address of the link
 597  * pointing to the entry, so that delete_cmd_entry can delete the
 598  * entry.
 599  */
 600
 601 STATIC struct tblentry **lastcmdentry;
 602
 603
 604 STATIC struct tblentry *
 605 cmdlookup(char *name, int add)
 606 {
 607         int hashval;
 608         char *p;
 609         struct tblentry *cmdp;
 610         struct tblentry **pp;
 611
 612         p = name;
 613         hashval = *p << 4;
 614         while (*p)
 615                 hashval += *p++;
 616         hashval &= 0x7FFF;
 617         pp = &cmdtable[hashval % CMDTABLESIZE];
 618         for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 619                 if (equal(cmdp->cmdname, name))
 620                         break;
 621                 pp = &cmdp->next;
 622         }
 623         if (add && cmdp == NULL) {
 624                 INTOFF;
 625                 cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
 626                                         + strlen(name) + 1);
 627                 cmdp->next = NULL;
 628                 cmdp->cmdtype = CMDUNKNOWN;
 629                 cmdp->rehash = 0;
 630                 strcpy(cmdp->cmdname, name);
 631                 INTON;
 632         }
 633         lastcmdentry = pp;
 634         return cmdp;
 635 }
 636
 637 /*
 638  * Delete the command entry returned on the last lookup.
 639  */
 640
 641 STATIC void
 642 delete_cmd_entry(void)
 643 {
 644         struct tblentry *cmdp;
 645
 646         INTOFF;
 647         cmdp = *lastcmdentry;
 648         *lastcmdentry = cmdp->next;
 649         ckfree(cmdp);
 650         INTON;
 651 }
 652
 653
 654
 655 /*
 656  * Add a new command entry, replacing any existing command entry for
 657  * the same name.
 658  */
 659
 660 static void
 661 addcmdentry(char *name, struct cmdentry *entry)
 662 {
 663         struct tblentry *cmdp;
 664
 665         INTOFF;
 666         cmdp = cmdlookup(name, 1);
 667         if (cmdp->cmdtype == CMDFUNCTION) {
 668                 freefunc(cmdp->param.func);
 669         }
 670         cmdp->cmdtype = entry->cmdtype;
 671         cmdp->param = entry->u;
 672         INTON;
 673 }
 674
 675
 676 /*
 677  * Define a shell function.
 678  */
 679
 680 void
 681 defun(char *name, union node *func)
 682 {
 683         struct cmdentry entry;
 684
 685         INTOFF;
 686         entry.cmdtype = CMDFUNCTION;
 687         entry.u.func = copyfunc(func);
 688         addcmdentry(name, &entry);
 689         INTON;
 690 }
 691
 692
 693 /*
 694  * Delete a function if it exists.
 695  */
 696
 697 int
 698 unsetfunc(char *name)
 699 {
 700         struct tblentry *cmdp;
 701
 702         if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
 703                 freefunc(cmdp->param.func);
 704                 delete_cmd_entry();
 705                 return (0);
 706         }
 707         return (0);
 708 }
 709
 710 /*
 711  * Locate and print what a word is...
 712  */
 713
 714 int
 715 typecmd(int argc, char **argv)
 716 {
 717         struct cmdentry entry;
 718         struct tblentry *cmdp;
 719         char **pp;
 720         struct alias *ap;
 721         int i;
 722         int error = 0;
 723         extern char *const parsekwd[];
 724
 725         for (i = 1; i < argc; i++) {
 726                 out1str(argv[i]);
 727                 /* First look at the keywords */
 728                 for (pp = (char **)parsekwd; *pp; pp++)
 729                         if (**pp == *argv[i] && equal(*pp, argv[i]))
 730                                 break;
 731
 732                 if (*pp) {
 733                         out1str(" is a shell keyword\n");
 734                         continue;
 735                 }
 736
 737                 /* Then look at the aliases */
 738                 if ((ap = lookupalias(argv[i], 1)) != NULL) {
 739                         out1fmt(" is an alias for %s\n", ap->val);
 740                         continue;
 741                 }
 742
 743                 /* Then check if it is a tracked alias */
 744                 if ((cmdp = cmdlookup(argv[i], 0)) != NULL) {
 745                         entry.cmdtype = cmdp->cmdtype;
 746                         entry.u = cmdp->param;
 747                 }
 748                 else {
 749                         /* Finally use brute force */
 750                         find_command(argv[i], &entry, 0, pathval());
 751                 }
 752
 753                 switch (entry.cmdtype) {
 754                 case CMDNORMAL: {
 755                         if (strchr(argv[i], '/') == NULL) {
 756                                 char *path = pathval(), *name;
 757                                 int j = entry.u.index;
 758                                 do {
 759                                         name = padvance(&path, argv[i]);
 760                                         stunalloc(name);
 761                                 } while (--j >= 0);
 762                                 out1fmt(" is%s %s\n",
 763                                     cmdp ? " a tracked alias for" : "", name);
 764                         } else {
 765                                 if (access(argv[i], X_OK) == 0)
 766                                         out1fmt(" is %s\n", argv[i]);
 767                                 else
 768                                         out1fmt(": %s\n", strerror(errno));
 769                         }
 770                         break;
 771                 }
 772                 case CMDFUNCTION:
 773                         out1str(" is a shell function\n");
 774                         break;
 775
 776                 case CMDBUILTIN:
 777                         out1str(" is a shell builtin\n");
 778                         break;
 779
 780                 default:
 781                         out1str(": not found\n");
 782                         error |= 127;
 783                         break;
 784                 }
 785         }
 786         return error;
 787 }
 788
 789 /*
 790  * $PchId: exec.c,v 1.6 2006/04/10 14:47:03 philip Exp $
 791  */