bin/sh/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  * 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  * @(#)exec.c   8.4 (Berkeley) 6/8/95
  37  * $FreeBSD: src/bin/sh/exec.c,v 1.14.2.4 2002/08/27 01:36:28 tjr Exp $
  38  * $DragonFly: src/bin/sh/exec.c,v 1.8 2006/09/28 22:29:44 pavalos Exp $
  39  */
  40
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43 #include <unistd.h>
  44 #include <fcntl.h>
  45 #include <errno.h>
  46 #include <stdlib.h>
  47
  48 /*
  49  * When commands are first encountered, they are entered in a hash table.
  50  * This ensures that a full path search will not have to be done for them
  51  * on each invocation.
  52  *
  53  * We should investigate converting to a linear search, even though that
  54  * would make the command name "hash" a misnomer.
  55  */
  56
  57 #include "shell.h"
  58 #include "main.h"
  59 #include "nodes.h"
  60 #include "parser.h"
  61 #include "redir.h"
  62 #include "eval.h"
  63 #include "exec.h"
  64 #include "builtins.h"
  65 #include "var.h"
  66 #include "options.h"
  67 #include "input.h"
  68 #include "output.h"
  69 #include "syntax.h"
  70 #include "memalloc.h"
  71 #include "error.h"
  72 #include "init.h"
  73 #include "mystring.h"
  74 #include "show.h"
  75 #include "jobs.h"
  76 #include "alias.h"
  77
  78
  79 #define CMDTABLESIZE 31         /* should be prime */
  80 #define ARB 1                   /* actual size determined at run time */
  81
  82
  83
  84 struct tblentry {
  85         struct tblentry *next;  /* next entry in hash chain */
  86         union param param;      /* definition of builtin function */
  87         short cmdtype;          /* index identifying command */
  88         char rehash;            /* if set, cd done since entry created */
  89         char cmdname[ARB];      /* name of command */
  90 };
  91
  92
  93 STATIC struct tblentry *cmdtable[CMDTABLESIZE];
  94 STATIC int builtinloc = -1;             /* index in path of %builtin, or -1 */
  95 int exerrno = 0;                        /* Last exec error */
  96
  97
  98 STATIC void tryexec(char *, char **, char **);
  99 STATIC void printentry(struct tblentry *, int);
 100 STATIC struct tblentry *cmdlookup(char *, int);
 101 STATIC void delete_cmd_entry(void);
 102
 103 extern const char *const parsekwd[];
 104
 105 /*
 106  * Exec a program.  Never returns.  If you change this routine, you may
 107  * have to change the find_command routine as well.
 108  */
 109
 110 void
 111 shellexec(char **argv, char **envp, const char *path, int idx)
 112 {
 113         char *cmdname;
 114         int e;
 115
 116         if (strchr(argv[0], '/') != NULL) {
 117                 tryexec(argv[0], argv, envp);
 118                 e = errno;
 119         } else {
 120                 e = ENOENT;
 121                 while ((cmdname = padvance(&path, argv[0])) != NULL) {
 122                         if (--idx < 0 && pathopt == NULL) {
 123                                 tryexec(cmdname, argv, envp);
 124                                 if (errno != ENOENT && errno != ENOTDIR)
 125                                         e = errno;
 126                         }
 127                         stunalloc(cmdname);
 128                 }
 129         }
 130
 131         /* Map to POSIX errors */
 132         switch (e) {
 133         case EACCES:
 134                 exerrno = 126;
 135                 break;
 136         case ENOENT:
 137                 exerrno = 127;
 138                 break;
 139         default:
 140                 exerrno = 2;
 141                 break;
 142         }
 143         exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC));
 144 }
 145
 146
 147 STATIC void
 148 tryexec(char *cmd, char **argv, char **envp)
 149 {
 150         int e;
 151
 152         execve(cmd, argv, envp);
 153         e = errno;
 154         if (e == ENOEXEC) {
 155                 initshellproc();
 156                 setinputfile(cmd, 0);
 157                 commandname = arg0 = savestr(argv[0]);
 158                 setparam(argv + 1);
 159                 exraise(EXSHELLPROC);
 160                 /*NOTREACHED*/
 161         }
 162         errno = e;
 163 }
 164
 165 /*
 166  * Do a path search.  The variable path (passed by reference) should be
 167  * set to the start of the path before the first call; padvance will update
 168  * this value as it proceeds.  Successive calls to padvance will return
 169  * the possible path expansions in sequence.  If an option (indicated by
 170  * a percent sign) appears in the path entry then the global variable
 171  * pathopt will be set to point to it; otherwise pathopt will be set to
 172  * NULL.
 173  */
 174
 175 const char *pathopt;
 176
 177 char *
 178 padvance(const char **path, const char *name)
 179 {
 180         const char *p;
 181         char *q;
 182         const char *start;
 183         int len;
 184
 185         if (*path == NULL)
 186                 return NULL;
 187         start = *path;
 188         for (p = start ; *p && *p != ':' && *p != '%' ; p++);
 189         len = p - start + strlen(name) + 2;     /* "2" is for '/' and '\0' */
 190         while (stackblocksize() < len)
 191                 growstackblock();
 192         q = stackblock();
 193         if (p != start) {
 194                 memcpy(q, start, p - start);
 195                 q += p - start;
 196                 *q++ = '/';
 197         }
 198         strcpy(q, name);
 199         pathopt = NULL;
 200         if (*p == '%') {
 201                 pathopt = ++p;
 202                 while (*p && *p != ':')  p++;
 203         }
 204         if (*p == ':')
 205                 *path = p + 1;
 206         else
 207                 *path = NULL;
 208         return stalloc(len);
 209 }
 210
 211
 212
 213 /*** Command hashing code ***/
 214
 215
 216 int
 217 hashcmd(int argc __unused, char **argv __unused)
 218 {
 219         struct tblentry **pp;
 220         struct tblentry *cmdp;
 221         int c;
 222         int verbose;
 223         struct cmdentry entry;
 224         char *name;
 225
 226         verbose = 0;
 227         while ((c = nextopt("rv")) != '\0') {
 228                 if (c == 'r') {
 229                         clearcmdentry(0);
 230                 } else if (c == 'v') {
 231                         verbose++;
 232                 }
 233         }
 234         if (*argptr == NULL) {
 235                 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
 236                         for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 237                                 if (cmdp->cmdtype == CMDNORMAL)
 238                                         printentry(cmdp, verbose);
 239                         }
 240                 }
 241                 return 0;
 242         }
 243         while ((name = *argptr) != NULL) {
 244                 if ((cmdp = cmdlookup(name, 0)) != NULL
 245                  && (cmdp->cmdtype == CMDNORMAL
 246                      || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
 247                         delete_cmd_entry();
 248                 find_command(name, &entry, 1, pathval());
 249                 if (verbose) {
 250                         if (entry.cmdtype != CMDUNKNOWN) {      /* if no error msg */
 251                                 cmdp = cmdlookup(name, 0);
 252                                 if (cmdp != NULL)
 253                                         printentry(cmdp, verbose);
 254                                 else
 255                                         outfmt(&errout, "%s: not found\n", name);
 256                         }
 257                         flushall();
 258                 }
 259                 argptr++;
 260         }
 261         return 0;
 262 }
 263
 264
 265 STATIC void
 266 printentry(struct tblentry *cmdp, int verbose)
 267 {
 268         int idx;
 269         const char *path;
 270         char *name;
 271
 272         if (cmdp->cmdtype == CMDNORMAL) {
 273                 idx = cmdp->param.index;
 274                 path = pathval();
 275                 do {
 276                         name = padvance(&path, cmdp->cmdname);
 277                         stunalloc(name);
 278                 } while (--idx >= 0);
 279                 out1str(name);
 280         } else if (cmdp->cmdtype == CMDBUILTIN) {
 281                 out1fmt("builtin %s", cmdp->cmdname);
 282         } else if (cmdp->cmdtype == CMDFUNCTION) {
 283                 out1fmt("function %s", cmdp->cmdname);
 284                 if (verbose) {
 285                         INTOFF;
 286                         name = commandtext(cmdp->param.func);
 287                         out1c(' ');
 288                         out1str(name);
 289                         ckfree(name);
 290                         INTON;
 291                 }
 292 #ifdef DEBUG
 293         } else {
 294                 error("internal error: cmdtype %d", cmdp->cmdtype);
 295 #endif
 296         }
 297         if (cmdp->rehash)
 298                 out1c('*');
 299         out1c('\n');
 300 }
 301
 302
 303
 304 /*
 305  * Resolve a command name.  If you change this routine, you may have to
 306  * change the shellexec routine as well.
 307  */
 308
 309 void
 310 find_command(char *name, struct cmdentry *entry, int printerr, const char *path)
 311 {
 312         struct tblentry *cmdp;
 313         int idx;
 314         int prev;
 315         char *fullname;
 316         struct stat statb;
 317         int e;
 318         int i;
 319
 320         /* If name contains a slash, don't use the hash table */
 321         if (strchr(name, '/') != NULL) {
 322                 entry->cmdtype = CMDNORMAL;
 323                 entry->u.index = 0;
 324                 return;
 325         }
 326
 327         /* If name is in the table, and not invalidated by cd, we're done */
 328         if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0)
 329                 goto success;
 330
 331         /* If %builtin not in path, check for builtin next */
 332         if (builtinloc < 0 && (i = find_builtin(name)) >= 0) {
 333                 INTOFF;
 334                 cmdp = cmdlookup(name, 1);
 335                 cmdp->cmdtype = CMDBUILTIN;
 336                 cmdp->param.index = i;
 337                 INTON;
 338                 goto success;
 339         }
 340
 341         /* We have to search path. */
 342         prev = -1;              /* where to start */
 343         if (cmdp) {             /* doing a rehash */
 344                 if (cmdp->cmdtype == CMDBUILTIN)
 345                         prev = builtinloc;
 346                 else
 347                         prev = cmdp->param.index;
 348         }
 349
 350         e = ENOENT;
 351         idx = -1;
 352 loop:
 353         while ((fullname = padvance(&path, name)) != NULL) {
 354                 stunalloc(fullname);
 355                 idx++;
 356                 if (pathopt) {
 357                         if (prefix("builtin", pathopt)) {
 358                                 if ((i = find_builtin(name)) < 0)
 359                                         goto loop;
 360                                 INTOFF;
 361                                 cmdp = cmdlookup(name, 1);
 362                                 cmdp->cmdtype = CMDBUILTIN;
 363                                 cmdp->param.index = i;
 364                                 INTON;
 365                                 goto success;
 366                         } else if (prefix("func", pathopt)) {
 367                                 /* handled below */
 368                         } else {
 369                                 goto loop;      /* ignore unimplemented options */
 370                         }
 371                 }
 372                 /* if rehash, don't redo absolute path names */
 373                 if (fullname[0] == '/' && idx <= prev) {
 374                         if (idx < prev)
 375                                 goto loop;
 376                         TRACE(("searchexec \"%s\": no change\n", name));
 377                         goto success;
 378                 }
 379                 if (stat(fullname, &statb) < 0) {
 380                         if (errno != ENOENT && errno != ENOTDIR)
 381                                 e = errno;
 382                         goto loop;
 383                 }
 384                 e = EACCES;     /* if we fail, this will be the error */
 385                 if (!S_ISREG(statb.st_mode))
 386                         goto loop;
 387                 if (pathopt) {          /* this is a %func directory */
 388                         stalloc(strlen(fullname) + 1);
 389                         readcmdfile(fullname);
 390                         if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION)
 391                                 error("%s not defined in %s", name, fullname);
 392                         stunalloc(fullname);
 393                         goto success;
 394                 }
 395 #ifdef notdef
 396                 if (statb.st_uid == geteuid()) {
 397                         if ((statb.st_mode & 0100) == 0)
 398                                 goto loop;
 399                 } else if (statb.st_gid == getegid()) {
 400                         if ((statb.st_mode & 010) == 0)
 401                                 goto loop;
 402                 } else {
 403                         if ((statb.st_mode & 01) == 0)
 404                                 goto loop;
 405                 }
 406 #endif
 407                 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
 408                 INTOFF;
 409                 cmdp = cmdlookup(name, 1);
 410                 cmdp->cmdtype = CMDNORMAL;
 411                 cmdp->param.index = idx;
 412                 INTON;
 413                 goto success;
 414         }
 415
 416         /* We failed.  If there was an entry for this command, delete it */
 417         if (cmdp)
 418                 delete_cmd_entry();
 419         if (printerr)
 420                 outfmt(out2, "%s: %s\n", name, errmsg(e, E_EXEC));
 421         entry->cmdtype = CMDUNKNOWN;
 422         return;
 423
 424 success:
 425         if (cmdp) {
 426                 cmdp->rehash = 0;
 427                 entry->cmdtype = cmdp->cmdtype;
 428                 entry->u = cmdp->param;
 429         } else
 430                 entry->cmdtype = CMDUNKNOWN;
 431 }
 432
 433
 434
 435 /*
 436  * Search the table of builtin commands.
 437  */
 438
 439 int
 440 find_builtin(char *name)
 441 {
 442         const struct builtincmd *bp;
 443
 444         for (bp = builtincmd ; bp->name ; bp++) {
 445                 if (*bp->name == *name && equal(bp->name, name))
 446                         return bp->code;
 447         }
 448         return -1;
 449 }
 450
 451
 452
 453 /*
 454  * Called when a cd is done.  Marks all commands so the next time they
 455  * are executed they will be rehashed.
 456  */
 457
 458 void
 459 hashcd(void)
 460 {
 461         struct tblentry **pp;
 462         struct tblentry *cmdp;
 463
 464         for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
 465                 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 466                         if (cmdp->cmdtype == CMDNORMAL
 467                          || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
 468                                 cmdp->rehash = 1;
 469                 }
 470         }
 471 }
 472
 473
 474
 475 /*
 476  * Called before PATH is changed.  The argument is the new value of PATH;
 477  * pathval() still returns the old value at this point.  Called with
 478  * interrupts off.
 479  */
 480
 481 void
 482 changepath(const char *newval)
 483 {
 484         const char *old, *new;
 485         int idx;
 486         int firstchange;
 487         int bltin;
 488
 489         old = pathval();
 490         new = newval;
 491         firstchange = 9999;     /* assume no change */
 492         idx = 0;
 493         bltin = -1;
 494         for (;;) {
 495                 if (*old != *new) {
 496                         firstchange = idx;
 497                         if ((*old == '\0' && *new == ':')
 498                          || (*old == ':' && *new == '\0'))
 499                                 firstchange++;
 500                         old = new;      /* ignore subsequent differences */
 501                 }
 502                 if (*new == '\0')
 503                         break;
 504                 if (*new == '%' && bltin < 0 && prefix("builtin", new + 1))
 505                         bltin = idx;
 506                 if (*new == ':') {
 507                         idx++;
 508                 }
 509                 new++, old++;
 510         }
 511         if (builtinloc < 0 && bltin >= 0)
 512                 builtinloc = bltin;             /* zap builtins */
 513         if (builtinloc >= 0 && bltin < 0)
 514                 firstchange = 0;
 515         clearcmdentry(firstchange);
 516         builtinloc = bltin;
 517 }
 518
 519
 520 /*
 521  * Clear out command entries.  The argument specifies the first entry in
 522  * PATH which has changed.
 523  */
 524
 525 void
 526 clearcmdentry(int firstchange)
 527 {
 528         struct tblentry **tblp;
 529         struct tblentry **pp;
 530         struct tblentry *cmdp;
 531
 532         INTOFF;
 533         for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
 534                 pp = tblp;
 535                 while ((cmdp = *pp) != NULL) {
 536                         if ((cmdp->cmdtype == CMDNORMAL &&
 537                              cmdp->param.index >= firstchange)
 538                          || (cmdp->cmdtype == CMDBUILTIN &&
 539                              builtinloc >= firstchange)) {
 540                                 *pp = cmdp->next;
 541                                 ckfree(cmdp);
 542                         } else {
 543                                 pp = &cmdp->next;
 544                         }
 545                 }
 546         }
 547         INTON;
 548 }
 549
 550
 551 /*
 552  * Delete all functions.
 553  */
 554
 555 #ifdef mkinit
 556 MKINIT void deletefuncs(void);
 557
 558 SHELLPROC {
 559         deletefuncs();
 560 }
 561 #endif
 562
 563 void
 564 deletefuncs(void)
 565 {
 566         struct tblentry **tblp;
 567         struct tblentry **pp;
 568         struct tblentry *cmdp;
 569
 570         INTOFF;
 571         for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
 572                 pp = tblp;
 573                 while ((cmdp = *pp) != NULL) {
 574                         if (cmdp->cmdtype == CMDFUNCTION) {
 575                                 *pp = cmdp->next;
 576                                 freefunc(cmdp->param.func);
 577                                 ckfree(cmdp);
 578                         } else {
 579                                 pp = &cmdp->next;
 580                         }
 581                 }
 582         }
 583         INTON;
 584 }
 585
 586
 587
 588 /*
 589  * Locate a command in the command hash table.  If "add" is nonzero,
 590  * add the command to the table if it is not already present.  The
 591  * variable "lastcmdentry" is set to point to the address of the link
 592  * pointing to the entry, so that delete_cmd_entry can delete the
 593  * entry.
 594  */
 595
 596 STATIC struct tblentry **lastcmdentry;
 597
 598
 599 STATIC struct tblentry *
 600 cmdlookup(char *name, int add)
 601 {
 602         int hashval;
 603         char *p;
 604         struct tblentry *cmdp;
 605         struct tblentry **pp;
 606
 607         p = name;
 608         hashval = *p << 4;
 609         while (*p)
 610                 hashval += *p++;
 611         hashval &= 0x7FFF;
 612         pp = &cmdtable[hashval % CMDTABLESIZE];
 613         for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 614                 if (equal(cmdp->cmdname, name))
 615                         break;
 616                 pp = &cmdp->next;
 617         }
 618         if (add && cmdp == NULL) {
 619                 INTOFF;
 620                 cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
 621                                         + strlen(name) + 1);
 622                 cmdp->next = NULL;
 623                 cmdp->cmdtype = CMDUNKNOWN;
 624                 cmdp->rehash = 0;
 625                 strcpy(cmdp->cmdname, name);
 626                 INTON;
 627         }
 628         lastcmdentry = pp;
 629         return cmdp;
 630 }
 631
 632 /*
 633  * Delete the command entry returned on the last lookup.
 634  */
 635
 636 STATIC void
 637 delete_cmd_entry(void)
 638 {
 639         struct tblentry *cmdp;
 640
 641         INTOFF;
 642         cmdp = *lastcmdentry;
 643         *lastcmdentry = cmdp->next;
 644         ckfree(cmdp);
 645         INTON;
 646 }
 647
 648
 649
 650 /*
 651  * Add a new command entry, replacing any existing command entry for
 652  * the same name.
 653  */
 654
 655 void
 656 addcmdentry(char *name, struct cmdentry *entry)
 657 {
 658         struct tblentry *cmdp;
 659
 660         INTOFF;
 661         cmdp = cmdlookup(name, 1);
 662         if (cmdp->cmdtype == CMDFUNCTION) {
 663                 freefunc(cmdp->param.func);
 664         }
 665         cmdp->cmdtype = entry->cmdtype;
 666         cmdp->param = entry->u;
 667         INTON;
 668 }
 669
 670
 671 /*
 672  * Define a shell function.
 673  */
 674
 675 void
 676 defun(char *name, union node *func)
 677 {
 678         struct cmdentry entry;
 679
 680         INTOFF;
 681         entry.cmdtype = CMDFUNCTION;
 682         entry.u.func = copyfunc(func);
 683         addcmdentry(name, &entry);
 684         INTON;
 685 }
 686
 687
 688 /*
 689  * Delete a function if it exists.
 690  */
 691
 692 int
 693 unsetfunc(char *name)
 694 {
 695         struct tblentry *cmdp;
 696
 697         if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
 698                 freefunc(cmdp->param.func);
 699                 delete_cmd_entry();
 700         }
 701         return (0);
 702 }
 703
 704 /*
 705  * Locate and print what a word is...
 706  */
 707
 708 int
 709 typecmd(int argc, char **argv)
 710 {
 711         struct cmdentry entry;
 712         struct tblentry *cmdp;
 713         const char * const *pp;
 714         struct alias *ap;
 715         int i;
 716         int err = 0;
 717
 718         for (i = 1; i < argc; i++) {
 719                 out1str(argv[i]);
 720                 /* First look at the keywords */
 721                 for (pp = parsekwd; *pp; pp++)
 722                         if (**pp == *argv[i] && equal(*pp, argv[i]))
 723                                 break;
 724
 725                 if (*pp) {
 726                         out1str(" is a shell keyword\n");
 727                         continue;
 728                 }
 729
 730                 /* Then look at the aliases */
 731                 if ((ap = lookupalias(argv[i], 1)) != NULL) {
 732                         out1fmt(" is an alias for %s\n", ap->val);
 733                         continue;
 734                 }
 735
 736                 /* Then check if it is a tracked alias */
 737                 if ((cmdp = cmdlookup(argv[i], 0)) != NULL) {
 738                         entry.cmdtype = cmdp->cmdtype;
 739                         entry.u = cmdp->param;
 740                 }
 741                 else {
 742                         /* Finally use brute force */
 743                         find_command(argv[i], &entry, 0, pathval());
 744                 }
 745
 746                 switch (entry.cmdtype) {
 747                 case CMDNORMAL: {
 748                         if (strchr(argv[i], '/') == NULL) {
 749                                 const char *path = pathval();
 750                                 char *name;
 751                                 int j = entry.u.index;
 752                                 do {
 753                                         name = padvance(&path, argv[i]);
 754                                         stunalloc(name);
 755                                 } while (--j >= 0);
 756                                 out1fmt(" is%s %s\n",
 757                                     cmdp ? " a tracked alias for" : "", name);
 758                         } else {
 759                                 if (access(argv[i], X_OK) == 0) {
 760                                         out1fmt(" is %s\n", argv[i]);
 761                                 }
 762                                 else {
 763                                         out1fmt(": %s\n", strerror(errno));
 764                                         err |= 127;
 765                                 }
 766                         }
 767                         break;
 768                 }
 769                 case CMDFUNCTION:
 770                         out1str(" is a shell function\n");
 771                         break;
 772
 773                 case CMDBUILTIN:
 774                         out1str(" is a shell builtin\n");
 775                         break;
 776
 777                 default:
 778                         out1str(": not found\n");
 779                         err |= 127;
 780                         break;
 781                 }
 782         }
 783         return err;
 784 }