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 #if !__minix_vmd
 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 #endif
 170 }
 171
 172 /*
 173  * Do a path search.  The variable path (passed by reference) should be
 174  * set to the start of the path before the first call; padvance will update
 175  * this value as it proceeds.  Successive calls to padvance will return
 176  * the possible path expansions in sequence.  If an option (indicated by
 177  * a percent sign) appears in the path entry then the global variable
 178  * pathopt will be set to point to it; otherwise pathopt will be set to
 179  * NULL.
 180  */
 181
 182 char *pathopt;
 183
 184 char *
 185 padvance(char **path, char *name)
 186 {
 187         char *p, *q;
 188         char *start;
 189         int len;
 190
 191         if (*path == NULL)
 192                 return NULL;
 193         start = *path;
 194         for (p = start ; *p && *p != ':' && *p != '%' ; p++);
 195         len = p - start + strlen(name) + 2;     /* "2" is for '/' and '\0' */
 196         while (stackblocksize() < len)
 197                 growstackblock();
 198         q = stackblock();
 199         if (p != start) {
 200                 memcpy(q, start, p - start);
 201                 q += p - start;
 202                 *q++ = '/';
 203         }
 204         strcpy(q, name);
 205         pathopt = NULL;
 206         if (*p == '%') {
 207                 pathopt = ++p;
 208                 while (*p && *p != ':')  p++;
 209         }
 210         if (*p == ':')
 211                 *path = p + 1;
 212         else
 213                 *path = NULL;
 214         return stalloc(len);
 215 }
 216
 217
 218
 219 /*** Command hashing code ***/
 220
 221
 222 int
 223 hashcmd(int argc __unused, char **argv __unused)
 224 {
 225         struct tblentry **pp;
 226         struct tblentry *cmdp;
 227         int c;
 228         int verbose;
 229         struct cmdentry entry;
 230         char *name;
 231
 232         verbose = 0;
 233         while ((c = nextopt("rv")) != '\0') {
 234                 if (c == 'r') {
 235                         clearcmdentry(0);
 236                 } else if (c == 'v') {
 237                         verbose++;
 238                 }
 239         }
 240         if (*argptr == NULL) {
 241                 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
 242                         for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 243                                 if (cmdp->cmdtype == CMDNORMAL)
 244                                         printentry(cmdp, verbose);
 245                         }
 246                 }
 247                 return 0;
 248         }
 249         while ((name = *argptr) != NULL) {
 250                 if ((cmdp = cmdlookup(name, 0)) != NULL
 251                  && (cmdp->cmdtype == CMDNORMAL
 252                      || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
 253                         delete_cmd_entry();
 254                 find_command(name, &entry, 1, pathval());
 255                 if (verbose) {
 256                         if (entry.cmdtype != CMDUNKNOWN) {      /* if no error msg */
 257                                 cmdp = cmdlookup(name, 0);
 258                                 if (cmdp != NULL)
 259                                         printentry(cmdp, verbose);
 260                                 else
 261                                         outfmt(&errout, "%s: not found\n", name);
 262                         }
 263                         flushall();
 264                 }
 265                 argptr++;
 266         }
 267         return 0;
 268 }
 269
 270
 271 STATIC void
 272 printentry(struct tblentry *cmdp, int verbose)
 273 {
 274         int index;
 275         char *path;
 276         char *name;
 277
 278         if (cmdp->cmdtype == CMDNORMAL) {
 279                 index = cmdp->param.index;
 280                 path = pathval();
 281                 do {
 282                         name = padvance(&path, cmdp->cmdname);
 283                         stunalloc(name);
 284                 } while (--index >= 0);
 285                 out1str(name);
 286         } else if (cmdp->cmdtype == CMDBUILTIN) {
 287                 out1fmt("builtin %s", cmdp->cmdname);
 288         } else if (cmdp->cmdtype == CMDFUNCTION) {
 289                 out1fmt("function %s", cmdp->cmdname);
 290                 if (verbose) {
 291                         INTOFF;
 292                         name = commandtext(cmdp->param.func);
 293                         out1c(' ');
 294                         out1str(name);
 295                         ckfree(name);
 296                         INTON;
 297                 }
 298 #if DEBUG
 299         } else {
 300                 error("internal error: cmdtype %d", cmdp->cmdtype);
 301 #endif
 302         }
 303         if (cmdp->rehash)
 304                 out1c('*');
 305         out1c('\n');
 306 }
 307
 308
 309
 310 /*
 311  * Resolve a command name.  If you change this routine, you may have to
 312  * change the shellexec routine as well.
 313  */
 314
 315 void
 316 find_command(char *name, struct cmdentry *entry, int printerr, char *path)
 317 {
 318         struct tblentry *cmdp;
 319         int index;
 320         int prev;
 321         char *fullname;
 322         struct stat statb;
 323         int e;
 324         int i;
 325
 326         /* If name contains a slash, don't use the hash table */
 327         if (strchr(name, '/') != NULL) {
 328                 entry->cmdtype = CMDNORMAL;
 329                 entry->u.index = 0;
 330                 return;
 331         }
 332
 333         /* If name is in the table, and not invalidated by cd, we're done */
 334         if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0)
 335                 goto success;
 336
 337         /* If %builtin not in path, check for builtin next */
 338         if (builtinloc < 0 && (i = find_builtin(name)) >= 0) {
 339                 INTOFF;
 340                 cmdp = cmdlookup(name, 1);
 341                 cmdp->cmdtype = CMDBUILTIN;
 342                 cmdp->param.index = i;
 343                 INTON;
 344                 goto success;
 345         }
 346
 347         /* We have to search path. */
 348         prev = -1;              /* where to start */
 349         if (cmdp) {             /* doing a rehash */
 350                 if (cmdp->cmdtype == CMDBUILTIN)
 351                         prev = builtinloc;
 352                 else
 353                         prev = cmdp->param.index;
 354         }
 355
 356         e = ENOENT;
 357         index = -1;
 358 loop:
 359         while ((fullname = padvance(&path, name)) != NULL) {
 360                 stunalloc(fullname);
 361                 index++;
 362                 if (pathopt) {
 363                         if (prefix("builtin", pathopt)) {
 364                                 if ((i = find_builtin(name)) < 0)
 365                                         goto loop;
 366                                 INTOFF;
 367                                 cmdp = cmdlookup(name, 1);
 368                                 cmdp->cmdtype = CMDBUILTIN;
 369                                 cmdp->param.index = i;
 370                                 INTON;
 371                                 goto success;
 372                         } else if (prefix("func", pathopt)) {
 373                                 /* handled below */
 374                         } else {
 375                                 goto loop;      /* ignore unimplemented options */
 376                         }
 377                 }
 378                 /* if rehash, don't redo absolute path names */
 379                 if (fullname[0] == '/' && index <= prev) {
 380                         if (index < prev)
 381                                 goto loop;
 382                         TRACE(("searchexec \"%s\": no change\n", name));
 383                         goto success;
 384                 }
 385                 if (stat(fullname, &statb) < 0) {
 386                         if (errno != ENOENT && errno != ENOTDIR)
 387                                 e = errno;
 388                         goto loop;
 389                 }
 390                 e = EACCES;     /* if we fail, this will be the error */
 391                 if (!S_ISREG(statb.st_mode))
 392                         goto loop;
 393                 if (pathopt) {          /* this is a %func directory */
 394                         stalloc(strlen(fullname) + 1);
 395                         readcmdfile(fullname);
 396                         if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION)
 397                                 error("%s not defined in %s", name, fullname);
 398                         stunalloc(fullname);
 399                         goto success;
 400                 }
 401 #ifdef notdef
 402                 if (statb.st_uid == geteuid()) {
 403                         if ((statb.st_mode & 0100) == 0)
 404                                 goto loop;
 405                 } else if (statb.st_gid == getegid()) {
 406                         if ((statb.st_mode & 010) == 0)
 407                                 goto loop;
 408                 } else {
 409                         if ((statb.st_mode & 01) == 0)
 410                                 goto loop;
 411                 }
 412 #endif
 413                 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
 414                 INTOFF;
 415                 cmdp = cmdlookup(name, 1);
 416                 cmdp->cmdtype = CMDNORMAL;
 417                 cmdp->param.index = index;
 418                 INTON;
 419                 goto success;
 420         }
 421
 422         /* We failed.  If there was an entry for this command, delete it */
 423         if (cmdp)
 424                 delete_cmd_entry();
 425         if (printerr) {
 426                 if (e == ENOENT || e == ENOTDIR)
 427                         outfmt(out2, "%s: not found\n", name);
 428                 else
 429                         outfmt(out2, "%s: %s\n", name, strerror(e));
 430         }
 431         entry->cmdtype = CMDUNKNOWN;
 432         return;
 433
 434 success:
 435         cmdp->rehash = 0;
 436         entry->cmdtype = cmdp->cmdtype;
 437         entry->u = cmdp->param;
 438 }
 439
 440
 441
 442 /*
 443  * Search the table of builtin commands.
 444  */
 445
 446 int
 447 find_builtin(char *name)
 448 {
 449         const struct builtincmd *bp;
 450
 451         for (bp = builtincmd ; bp->name ; bp++) {
 452                 if (*bp->name == *name && equal(bp->name, name))
 453                         return bp->code;
 454         }
 455         return -1;
 456 }
 457
 458
 459
 460 /*
 461  * Called when a cd is done.  Marks all commands so the next time they
 462  * are executed they will be rehashed.
 463  */
 464
 465 void
 466 hashcd(void)
 467 {
 468         struct tblentry **pp;
 469         struct tblentry *cmdp;
 470
 471         for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
 472                 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 473                         if (cmdp->cmdtype == CMDNORMAL
 474                          || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
 475                                 cmdp->rehash = 1;
 476                 }
 477         }
 478 }
 479
 480
 481
 482 /*
 483  * Called before PATH is changed.  The argument is the new value of PATH;
 484  * pathval() still returns the old value at this point.  Called with
 485  * interrupts off.
 486  */
 487
 488 void
 489 changepath(const char *newval)
 490 {
 491         const char *old, *new;
 492         int index;
 493         int firstchange;
 494         int bltin;
 495
 496         old = pathval();
 497         new = newval;
 498         firstchange = 9999;     /* assume no change */
 499         index = 0;
 500         bltin = -1;
 501         for (;;) {
 502                 if (*old != *new) {
 503                         firstchange = index;
 504                         if ((*old == '\0' && *new == ':')
 505                          || (*old == ':' && *new == '\0'))
 506                                 firstchange++;
 507                         old = new;      /* ignore subsequent differences */
 508                 }
 509                 if (*new == '\0')
 510                         break;
 511                 if (*new == '%' && bltin < 0 && prefix("builtin", new + 1))
 512                         bltin = index;
 513                 if (*new == ':') {
 514                         index++;
 515                 }
 516                 new++, old++;
 517         }
 518         if (builtinloc < 0 && bltin >= 0)
 519                 builtinloc = bltin;             /* zap builtins */
 520         if (builtinloc >= 0 && bltin < 0)
 521                 firstchange = 0;
 522         clearcmdentry(firstchange);
 523         builtinloc = bltin;
 524 }
 525
 526
 527 /*
 528  * Clear out command entries.  The argument specifies the first entry in
 529  * PATH which has changed.
 530  */
 531
 532 void
 533 clearcmdentry(int firstchange)
 534 {
 535         struct tblentry **tblp;
 536         struct tblentry **pp;
 537         struct tblentry *cmdp;
 538
 539         INTOFF;
 540         for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
 541                 pp = tblp;
 542                 while ((cmdp = *pp) != NULL) {
 543                         if ((cmdp->cmdtype == CMDNORMAL &&
 544                              cmdp->param.index >= firstchange)
 545                          || (cmdp->cmdtype == CMDBUILTIN &&
 546                              builtinloc >= firstchange)) {
 547                                 *pp = cmdp->next;
 548                                 ckfree(cmdp);
 549                         } else {
 550                                 pp = &cmdp->next;
 551                         }
 552                 }
 553         }
 554         INTON;
 555 }
 556
 557
 558 /*
 559  * Delete all functions.
 560  */
 561
 562 #ifdef mkinit
 563 INCLUDE "exec.h"
 564 SHELLPROC {
 565         deletefuncs();
 566 }
 567 #endif
 568
 569 void
 570 deletefuncs(void)
 571 {
 572         struct tblentry **tblp;
 573         struct tblentry **pp;
 574         struct tblentry *cmdp;
 575
 576         INTOFF;
 577         for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
 578                 pp = tblp;
 579                 while ((cmdp = *pp) != NULL) {
 580                         if (cmdp->cmdtype == CMDFUNCTION) {
 581                                 *pp = cmdp->next;
 582                                 freefunc(cmdp->param.func);
 583                                 ckfree(cmdp);
 584                         } else {
 585                                 pp = &cmdp->next;
 586                         }
 587                 }
 588         }
 589         INTON;
 590 }
 591
 592
 593
 594 /*
 595  * Locate a command in the command hash table.  If "add" is nonzero,
 596  * add the command to the table if it is not already present.  The
 597  * variable "lastcmdentry" is set to point to the address of the link
 598  * pointing to the entry, so that delete_cmd_entry can delete the
 599  * entry.
 600  */
 601
 602 STATIC struct tblentry **lastcmdentry;
 603
 604
 605 STATIC struct tblentry *
 606 cmdlookup(char *name, int add)
 607 {
 608         int hashval;
 609         char *p;
 610         struct tblentry *cmdp;
 611         struct tblentry **pp;
 612
 613         p = name;
 614         hashval = *p << 4;
 615         while (*p)
 616                 hashval += *p++;
 617         hashval &= 0x7FFF;
 618         pp = &cmdtable[hashval % CMDTABLESIZE];
 619         for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 620                 if (equal(cmdp->cmdname, name))
 621                         break;
 622                 pp = &cmdp->next;
 623         }
 624         if (add && cmdp == NULL) {
 625                 INTOFF;
 626                 cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
 627                                         + strlen(name) + 1);
 628                 cmdp->next = NULL;
 629                 cmdp->cmdtype = CMDUNKNOWN;
 630                 cmdp->rehash = 0;
 631                 strcpy(cmdp->cmdname, name);
 632                 INTON;
 633         }
 634         lastcmdentry = pp;
 635         return cmdp;
 636 }
 637
 638 /*
 639  * Delete the command entry returned on the last lookup.
 640  */
 641
 642 STATIC void
 643 delete_cmd_entry(void)
 644 {
 645         struct tblentry *cmdp;
 646
 647         INTOFF;
 648         cmdp = *lastcmdentry;
 649         *lastcmdentry = cmdp->next;
 650         ckfree(cmdp);
 651         INTON;
 652 }
 653
 654
 655
 656 /*
 657  * Add a new command entry, replacing any existing command entry for
 658  * the same name.
 659  */
 660
 661 static void
 662 addcmdentry(char *name, struct cmdentry *entry)
 663 {
 664         struct tblentry *cmdp;
 665
 666         INTOFF;
 667         cmdp = cmdlookup(name, 1);
 668         if (cmdp->cmdtype == CMDFUNCTION) {
 669                 freefunc(cmdp->param.func);
 670         }
 671         cmdp->cmdtype = entry->cmdtype;
 672         cmdp->param = entry->u;
 673         INTON;
 674 }
 675
 676
 677 /*
 678  * Define a shell function.
 679  */
 680
 681 void
 682 defun(char *name, union node *func)
 683 {
 684         struct cmdentry entry;
 685
 686         INTOFF;
 687         entry.cmdtype = CMDFUNCTION;
 688         entry.u.func = copyfunc(func);
 689         addcmdentry(name, &entry);
 690         INTON;
 691 }
 692
 693
 694 /*
 695  * Delete a function if it exists.
 696  */
 697
 698 int
 699 unsetfunc(char *name)
 700 {
 701         struct tblentry *cmdp;
 702
 703         if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
 704                 freefunc(cmdp->param.func);
 705                 delete_cmd_entry();
 706                 return (0);
 707         }
 708         return (0);
 709 }
 710
 711 /*
 712  * Locate and print what a word is...
 713  */
 714
 715 int
 716 typecmd(int argc, char **argv)
 717 {
 718         struct cmdentry entry;
 719         struct tblentry *cmdp;
 720         char **pp;
 721         struct alias *ap;
 722         int i;
 723         int error = 0;
 724         extern char *const parsekwd[];
 725
 726         for (i = 1; i < argc; i++) {
 727                 out1str(argv[i]);
 728                 /* First look at the keywords */
 729                 for (pp = (char **)parsekwd; *pp; pp++)
 730                         if (**pp == *argv[i] && equal(*pp, argv[i]))
 731                                 break;
 732
 733                 if (*pp) {
 734                         out1str(" is a shell keyword\n");
 735                         continue;
 736                 }
 737
 738                 /* Then look at the aliases */
 739                 if ((ap = lookupalias(argv[i], 1)) != NULL) {
 740                         out1fmt(" is an alias for %s\n", ap->val);
 741                         continue;
 742                 }
 743
 744                 /* Then check if it is a tracked alias */
 745                 if ((cmdp = cmdlookup(argv[i], 0)) != NULL) {
 746                         entry.cmdtype = cmdp->cmdtype;
 747                         entry.u = cmdp->param;
 748                 }
 749                 else {
 750                         /* Finally use brute force */
 751                         find_command(argv[i], &entry, 0, pathval());
 752                 }
 753
 754                 switch (entry.cmdtype) {
 755                 case CMDNORMAL: {
 756                         if (strchr(argv[i], '/') == NULL) {
 757                                 char *path = pathval(), *name;
 758                                 int j = entry.u.index;
 759                                 do {
 760                                         name = padvance(&path, argv[i]);
 761                                         stunalloc(name);
 762                                 } while (--j >= 0);
 763                                 out1fmt(" is%s %s\n",
 764                                     cmdp ? " a tracked alias for" : "", name);
 765                         } else {
 766                                 if (access(argv[i], X_OK) == 0)
 767                                         out1fmt(" is %s\n", argv[i]);
 768                                 else
 769                                         out1fmt(": %s\n", strerror(errno));
 770                         }
 771                         break;
 772                 }
 773                 case CMDFUNCTION:
 774                         out1str(" is a shell function\n");
 775                         break;
 776
 777                 case CMDBUILTIN:
 778                         out1str(" is a shell builtin\n");
 779                         break;
 780
 781                 default:
 782                         out1str(": not found\n");
 783                         error |= 127;
 784                         break;
 785                 }
 786         }
 787         return error;
 788 }
 789
 790 /*
 791  * $PchId: exec.c,v 1.6 2006/04/10 14:47:03 philip Exp $
 792  */