shell_cmds/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. 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 __FBSDID("$FreeBSD: head/bin/sh/exec.c 317882 2017-05-06 13:28:42Z jilles $");
  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 <paths.h>
  47 #include <stdlib.h>
  48
  49 /*
  50  * When commands are first encountered, they are entered in a hash table.
  51  * This ensures that a full path search will not have to be done for them
  52  * on each invocation.
  53  *
  54  * We should investigate converting to a linear search, even though that
  55  * would make the command name "hash" a misnomer.
  56  */
  57
  58 #include "shell.h"
  59 #include "main.h"
  60 #include "nodes.h"
  61 #include "parser.h"
  62 #include "redir.h"
  63 #include "eval.h"
  64 #include "exec.h"
  65 #include "builtins.h"
  66 #include "var.h"
  67 #include "options.h"
  68 #include "input.h"
  69 #include "output.h"
  70 #include "syntax.h"
  71 #include "memalloc.h"
  72 #include "error.h"
  73 #include "mystring.h"
  74 #include "show.h"
  75 #include "jobs.h"
  76 #include "alias.h"
  77
  78
  79 #ifdef __APPLE__
  80 #define eaccess(path, mode) faccessat(AT_FDCWD, path, mode, AT_EACCESS)
  81 #endif /* __APPLE__ */
  82
  83 #define CMDTABLESIZE 31         /* should be prime */
  84
  85
  86
  87 struct tblentry {
  88         struct tblentry *next;  /* next entry in hash chain */
  89         union param param;      /* definition of builtin function */
  90         int special;            /* flag for special builtin commands */
  91         signed char cmdtype;    /* index identifying command */
  92         char cmdname[];         /* name of command */
  93 };
  94
  95
  96 static struct tblentry *cmdtable[CMDTABLESIZE];
  97 static int cmdtable_cd = 0;     /* cmdtable contains cd-dependent entries */
  98 int exerrno = 0;                        /* Last exec error */
  99
 100
 101 static void tryexec(char *, char **, char **);
 102 static void printentry(struct tblentry *, int);
 103 static struct tblentry *cmdlookup(const char *, int);
 104 static void delete_cmd_entry(void);
 105 static void addcmdentry(const char *, struct cmdentry *);
 106
 107
 108
 109 /*
 110  * Exec a program.  Never returns.  If you change this routine, you may
 111  * have to change the find_command routine as well.
 112  *
 113  * The argv array may be changed and element argv[-1] should be writable.
 114  */
 115
 116 void
 117 shellexec(char **argv, char **envp, const char *path, int idx)
 118 {
 119         char *cmdname;
 120         int e;
 121
 122         if (strchr(argv[0], '/') != NULL) {
 123                 tryexec(argv[0], argv, envp);
 124                 e = errno;
 125         } else {
 126                 e = ENOENT;
 127                 while ((cmdname = padvance(&path, argv[0])) != NULL) {
 128                         if (--idx < 0 && pathopt == NULL) {
 129                                 tryexec(cmdname, argv, envp);
 130                                 if (errno != ENOENT && errno != ENOTDIR)
 131                                         e = errno;
 132                                 if (e == ENOEXEC)
 133                                         break;
 134                         }
 135                         stunalloc(cmdname);
 136                 }
 137         }
 138
 139         /* Map to POSIX errors */
 140         if (e == ENOENT || e == ENOTDIR) {
 141                 exerrno = 127;
 142                 exerror(EXEXEC, "%s: not found", argv[0]);
 143         } else {
 144                 exerrno = 126;
 145                 exerror(EXEXEC, "%s: %s", argv[0], strerror(e));
 146         }
 147 }
 148
 149
 150 static void
 151 tryexec(char *cmd, char **argv, char **envp)
 152 {
 153         int e, in;
 154         ssize_t n;
 155         char buf[256];
 156
 157         execve(cmd, argv, envp);
 158         e = errno;
 159         if (e == ENOEXEC) {
 160                 INTOFF;
 161                 in = open(cmd, O_RDONLY | O_NONBLOCK);
 162                 if (in != -1) {
 163                         n = pread(in, buf, sizeof buf, 0);
 164                         close(in);
 165                         if (n > 0 && memchr(buf, '\0', n) != NULL) {
 166                                 errno = ENOEXEC;
 167                                 return;
 168                         }
 169                 }
 170                 *argv = cmd;
 171                 *--argv = __DECONST(char *, _PATH_BSHELL);
 172                 execve(_PATH_BSHELL, argv, envp);
 173         }
 174         errno = e;
 175 }
 176
 177 /*
 178  * Do a path search.  The variable path (passed by reference) should be
 179  * set to the start of the path before the first call; padvance will update
 180  * this value as it proceeds.  Successive calls to padvance will return
 181  * the possible path expansions in sequence.  If an option (indicated by
 182  * a percent sign) appears in the path entry then the global variable
 183  * pathopt will be set to point to it; otherwise pathopt will be set to
 184  * NULL.
 185  */
 186
 187 const char *pathopt;
 188
 189 char *
 190 padvance(const char **path, const char *name)
 191 {
 192         const char *p, *start;
 193         char *q;
 194         size_t len, namelen;
 195
 196         if (*path == NULL)
 197                 return NULL;
 198         start = *path;
 199         for (p = start; *p && *p != ':' && *p != '%'; p++)
 200                 ; /* nothing */
 201         namelen = strlen(name);
 202         len = p - start + namelen + 2;  /* "2" is for '/' and '\0' */
 203         STARTSTACKSTR(q);
 204         CHECKSTRSPACE(len, q);
 205         if (p != start) {
 206                 memcpy(q, start, p - start);
 207                 q += p - start;
 208                 *q++ = '/';
 209         }
 210         memcpy(q, name, namelen + 1);
 211         pathopt = NULL;
 212         if (*p == '%') {
 213                 pathopt = ++p;
 214                 while (*p && *p != ':')  p++;
 215         }
 216         if (*p == ':')
 217                 *path = p + 1;
 218         else
 219                 *path = NULL;
 220         return stalloc(len);
 221 }
 222
 223
 224
 225 /*** Command hashing code ***/
 226
 227
 228 int
 229 hashcmd(int argc __unused, char **argv __unused)
 230 {
 231         struct tblentry **pp;
 232         struct tblentry *cmdp;
 233         int c;
 234         int verbose;
 235         struct cmdentry entry;
 236         char *name;
 237         int errors;
 238
 239         errors = 0;
 240         verbose = 0;
 241         while ((c = nextopt("rv")) != '\0') {
 242                 if (c == 'r') {
 243                         clearcmdentry();
 244                 } else if (c == 'v') {
 245                         verbose++;
 246                 }
 247         }
 248         if (*argptr == NULL) {
 249                 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
 250                         for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 251                                 if (cmdp->cmdtype == CMDNORMAL)
 252                                         printentry(cmdp, verbose);
 253                         }
 254                 }
 255                 return 0;
 256         }
 257         while ((name = *argptr) != NULL) {
 258                 if ((cmdp = cmdlookup(name, 0)) != NULL
 259                  && cmdp->cmdtype == CMDNORMAL)
 260                         delete_cmd_entry();
 261                 find_command(name, &entry, DO_ERR, pathval());
 262                 if (entry.cmdtype == CMDUNKNOWN)
 263                         errors = 1;
 264                 else if (verbose) {
 265                         cmdp = cmdlookup(name, 0);
 266                         if (cmdp != NULL)
 267                                 printentry(cmdp, verbose);
 268                         else {
 269                                 outfmt(out2, "%s: not found\n", name);
 270                                 errors = 1;
 271                         }
 272                         flushall();
 273                 }
 274                 argptr++;
 275         }
 276         return errors;
 277 }
 278
 279
 280 static void
 281 printentry(struct tblentry *cmdp, int verbose)
 282 {
 283         int idx;
 284         const char *path;
 285         char *name;
 286
 287         if (cmdp->cmdtype == CMDNORMAL) {
 288                 idx = cmdp->param.index;
 289                 path = pathval();
 290                 do {
 291                         name = padvance(&path, cmdp->cmdname);
 292                         stunalloc(name);
 293                 } while (--idx >= 0);
 294                 out1str(name);
 295         } else if (cmdp->cmdtype == CMDBUILTIN) {
 296                 out1fmt("builtin %s", cmdp->cmdname);
 297         } else if (cmdp->cmdtype == CMDFUNCTION) {
 298                 out1fmt("function %s", cmdp->cmdname);
 299                 if (verbose) {
 300                         INTOFF;
 301                         name = commandtext(getfuncnode(cmdp->param.func));
 302                         out1c(' ');
 303                         out1str(name);
 304                         ckfree(name);
 305                         INTON;
 306                 }
 307 #ifdef DEBUG
 308         } else {
 309                 error("internal error: cmdtype %d", cmdp->cmdtype);
 310 #endif
 311         }
 312         out1c('\n');
 313 }
 314
 315
 316
 317 /*
 318  * Resolve a command name.  If you change this routine, you may have to
 319  * change the shellexec routine as well.
 320  */
 321
 322 void
 323 find_command(const char *name, struct cmdentry *entry, int act,
 324     const char *path)
 325 {
 326         struct tblentry *cmdp, loc_cmd;
 327         int idx;
 328         char *fullname;
 329         struct stat statb;
 330         int e;
 331         int i;
 332         int spec;
 333         int cd;
 334
 335         /* If name contains a slash, don't use the hash table */
 336         if (strchr(name, '/') != NULL) {
 337                 entry->cmdtype = CMDNORMAL;
 338                 entry->u.index = 0;
 339                 entry->special = 0;
 340                 return;
 341         }
 342
 343         cd = 0;
 344
 345         /* If name is in the table, we're done */
 346         if ((cmdp = cmdlookup(name, 0)) != NULL) {
 347                 if (cmdp->cmdtype == CMDFUNCTION && act & DO_NOFUNC)
 348                         cmdp = NULL;
 349                 else
 350                         goto success;
 351         }
 352
 353         /* Check for builtin next */
 354         if ((i = find_builtin(name, &spec)) >= 0) {
 355                 INTOFF;
 356                 cmdp = cmdlookup(name, 1);
 357                 if (cmdp->cmdtype == CMDFUNCTION)
 358                         cmdp = &loc_cmd;
 359                 cmdp->cmdtype = CMDBUILTIN;
 360                 cmdp->param.index = i;
 361                 cmdp->special = spec;
 362                 INTON;
 363                 goto success;
 364         }
 365
 366         /* We have to search path. */
 367
 368         e = ENOENT;
 369         idx = -1;
 370         for (;(fullname = padvance(&path, name)) != NULL; stunalloc(fullname)) {
 371                 idx++;
 372                 if (pathopt) {
 373                         if (strncmp(pathopt, "func", 4) == 0) {
 374                                 /* handled below */
 375                         } else {
 376                                 continue; /* ignore unimplemented options */
 377                         }
 378                 }
 379                 if (fullname[0] != '/')
 380                         cd = 1;
 381                 if (stat(fullname, &statb) < 0) {
 382                         if (errno != ENOENT && errno != ENOTDIR)
 383                                 e = errno;
 384                         continue;
 385                 }
 386                 e = EACCES;     /* if we fail, this will be the error */
 387                 if (!S_ISREG(statb.st_mode))
 388                         continue;
 389                 if (pathopt) {          /* this is a %func directory */
 390                         readcmdfile(fullname);
 391                         if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION)
 392                                 error("%s not defined in %s", name, fullname);
 393                         stunalloc(fullname);
 394                         goto success;
 395                 }
 396 #ifdef notdef
 397                 if (statb.st_uid == geteuid()) {
 398                         if ((statb.st_mode & 0100) == 0)
 399                                 goto loop;
 400                 } else if (statb.st_gid == getegid()) {
 401                         if ((statb.st_mode & 010) == 0)
 402                                 goto loop;
 403                 } else {
 404                         if ((statb.st_mode & 01) == 0)
 405                                 goto loop;
 406                 }
 407 #endif
 408                 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
 409                 INTOFF;
 410                 stunalloc(fullname);
 411                 cmdp = cmdlookup(name, 1);
 412                 if (cmdp->cmdtype == CMDFUNCTION)
 413                         cmdp = &loc_cmd;
 414                 cmdp->cmdtype = CMDNORMAL;
 415                 cmdp->param.index = idx;
 416                 cmdp->special = 0;
 417                 INTON;
 418                 goto success;
 419         }
 420
 421         if (act & DO_ERR) {
 422                 if (e == ENOENT || e == ENOTDIR)
 423                         outfmt(out2, "%s: not found\n", name);
 424                 else
 425                         outfmt(out2, "%s: %s\n", name, strerror(e));
 426         }
 427         entry->cmdtype = CMDUNKNOWN;
 428         entry->u.index = 0;
 429         entry->special = 0;
 430         return;
 431
 432 success:
 433         if (cd)
 434                 cmdtable_cd = 1;
 435         entry->cmdtype = cmdp->cmdtype;
 436         entry->u = cmdp->param;
 437         entry->special = cmdp->special;
 438 }
 439
 440
 441
 442 /*
 443  * Search the table of builtin commands.
 444  */
 445
 446 int
 447 find_builtin(const char *name, int *special)
 448 {
 449         const unsigned char *bp;
 450         size_t len;
 451
 452         len = strlen(name);
 453         for (bp = builtincmd ; *bp ; bp += 2 + bp[0]) {
 454                 if (bp[0] == len && memcmp(bp + 2, name, len) == 0) {
 455                         *special = (bp[1] & BUILTIN_SPECIAL) != 0;
 456                         return bp[1] & ~BUILTIN_SPECIAL;
 457                 }
 458         }
 459         return -1;
 460 }
 461
 462
 463
 464 /*
 465  * Called when a cd is done.  If any entry in cmdtable depends on the current
 466  * directory, simply clear cmdtable completely.
 467  */
 468
 469 void
 470 hashcd(void)
 471 {
 472         if (cmdtable_cd)
 473                 clearcmdentry();
 474 }
 475
 476
 477
 478 /*
 479  * Called before PATH is changed.  The argument is the new value of PATH;
 480  * pathval() still returns the old value at this point.  Called with
 481  * interrupts off.
 482  */
 483
 484 void
 485 changepath(const char *newval __unused)
 486 {
 487         clearcmdentry();
 488 }
 489
 490
 491 /*
 492  * Clear out cached utility locations.
 493  */
 494
 495 void
 496 clearcmdentry(void)
 497 {
 498         struct tblentry **tblp;
 499         struct tblentry **pp;
 500         struct tblentry *cmdp;
 501
 502         INTOFF;
 503         for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
 504                 pp = tblp;
 505                 while ((cmdp = *pp) != NULL) {
 506                         if (cmdp->cmdtype == CMDNORMAL) {
 507                                 *pp = cmdp->next;
 508                                 ckfree(cmdp);
 509                         } else {
 510                                 pp = &cmdp->next;
 511                         }
 512                 }
 513         }
 514         cmdtable_cd = 0;
 515         INTON;
 516 }
 517
 518
 519 /*
 520  * Locate a command in the command hash table.  If "add" is nonzero,
 521  * add the command to the table if it is not already present.  The
 522  * variable "lastcmdentry" is set to point to the address of the link
 523  * pointing to the entry, so that delete_cmd_entry can delete the
 524  * entry.
 525  */
 526
 527 static struct tblentry **lastcmdentry;
 528
 529
 530 static struct tblentry *
 531 cmdlookup(const char *name, int add)
 532 {
 533         unsigned int hashval;
 534         const char *p;
 535         struct tblentry *cmdp;
 536         struct tblentry **pp;
 537         size_t len;
 538
 539         p = name;
 540         hashval = (unsigned char)*p << 4;
 541         while (*p)
 542                 hashval += *p++;
 543         pp = &cmdtable[hashval % CMDTABLESIZE];
 544         for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 545                 if (equal(cmdp->cmdname, name))
 546                         break;
 547                 pp = &cmdp->next;
 548         }
 549         if (add && cmdp == NULL) {
 550                 INTOFF;
 551                 len = strlen(name);
 552                 cmdp = *pp = ckmalloc(sizeof (struct tblentry) + len + 1);
 553                 cmdp->next = NULL;
 554                 cmdp->cmdtype = CMDUNKNOWN;
 555                 memcpy(cmdp->cmdname, name, len + 1);
 556                 INTON;
 557         }
 558         lastcmdentry = pp;
 559         return cmdp;
 560 }
 561
 562 /*
 563  * Delete the command entry returned on the last lookup.
 564  */
 565
 566 static void
 567 delete_cmd_entry(void)
 568 {
 569         struct tblentry *cmdp;
 570
 571         INTOFF;
 572         cmdp = *lastcmdentry;
 573         *lastcmdentry = cmdp->next;
 574         ckfree(cmdp);
 575         INTON;
 576 }
 577
 578
 579
 580 /*
 581  * Add a new command entry, replacing any existing command entry for
 582  * the same name.
 583  */
 584
 585 static void
 586 addcmdentry(const char *name, struct cmdentry *entry)
 587 {
 588         struct tblentry *cmdp;
 589
 590         INTOFF;
 591         cmdp = cmdlookup(name, 1);
 592         if (cmdp->cmdtype == CMDFUNCTION) {
 593                 unreffunc(cmdp->param.func);
 594         }
 595         cmdp->cmdtype = entry->cmdtype;
 596         cmdp->param = entry->u;
 597         cmdp->special = entry->special;
 598         INTON;
 599 }
 600
 601
 602 /*
 603  * Define a shell function.
 604  */
 605
 606 void
 607 defun(const char *name, union node *func)
 608 {
 609         struct cmdentry entry;
 610
 611         INTOFF;
 612         entry.cmdtype = CMDFUNCTION;
 613         entry.u.func = copyfunc(func);
 614         entry.special = 0;
 615         addcmdentry(name, &entry);
 616         INTON;
 617 }
 618
 619
 620 /*
 621  * Delete a function if it exists.
 622  * Called with interrupts off.
 623  */
 624
 625 int
 626 unsetfunc(const char *name)
 627 {
 628         struct tblentry *cmdp;
 629
 630         if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
 631                 unreffunc(cmdp->param.func);
 632                 delete_cmd_entry();
 633                 return (0);
 634         }
 635         return (0);
 636 }
 637
 638
 639 /*
 640  * Check if a function by a certain name exists.
 641  */
 642 int
 643 isfunc(const char *name)
 644 {
 645         struct tblentry *cmdp;
 646         cmdp = cmdlookup(name, 0);
 647         return (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION);
 648 }
 649
 650
 651 /*
 652  * Shared code for the following builtin commands:
 653  *    type, command -v, command -V
 654  */
 655
 656 int
 657 typecmd_impl(int argc, char **argv, int cmd, const char *path)
 658 {
 659         struct cmdentry entry;
 660         struct tblentry *cmdp;
 661         const char *const *pp;
 662         struct alias *ap;
 663         int i;
 664         int error1 = 0;
 665
 666         if (path != pathval())
 667                 clearcmdentry();
 668
 669         for (i = 1; i < argc; i++) {
 670                 /* First look at the keywords */
 671                 for (pp = parsekwd; *pp; pp++)
 672                         if (**pp == *argv[i] && equal(*pp, argv[i]))
 673                                 break;
 674
 675                 if (*pp) {
 676                         if (cmd == TYPECMD_SMALLV)
 677                                 out1fmt("%s\n", argv[i]);
 678                         else
 679                                 out1fmt("%s is a shell keyword\n", argv[i]);
 680                         continue;
 681                 }
 682
 683                 /* Then look at the aliases */
 684                 if ((ap = lookupalias(argv[i], 1)) != NULL) {
 685                         if (cmd == TYPECMD_SMALLV) {
 686                                 out1fmt("alias %s=", argv[i]);
 687                                 out1qstr(ap->val);
 688                                 outcslow('\n', out1);
 689                         } else
 690                                 out1fmt("%s is an alias for %s\n", argv[i],
 691                                     ap->val);
 692                         continue;
 693                 }
 694
 695                 /* Then check if it is a tracked alias */
 696                 if ((cmdp = cmdlookup(argv[i], 0)) != NULL) {
 697                         entry.cmdtype = cmdp->cmdtype;
 698                         entry.u = cmdp->param;
 699                         entry.special = cmdp->special;
 700                 }
 701                 else {
 702                         /* Finally use brute force */
 703                         find_command(argv[i], &entry, 0, path);
 704                 }
 705
 706                 switch (entry.cmdtype) {
 707                 case CMDNORMAL: {
 708                         if (strchr(argv[i], '/') == NULL) {
 709                                 const char *path2 = path;
 710                                 char *name;
 711                                 int j = entry.u.index;
 712                                 do {
 713                                         name = padvance(&path2, argv[i]);
 714                                         stunalloc(name);
 715                                 } while (--j >= 0);
 716                                 if (cmd == TYPECMD_SMALLV)
 717                                         out1fmt("%s\n", name);
 718                                 else
 719                                         out1fmt("%s is%s %s\n", argv[i],
 720                                             (cmdp && cmd == TYPECMD_TYPE) ?
 721                                                 " a tracked alias for" : "",
 722                                             name);
 723                         } else {
 724                                 if (eaccess(argv[i], X_OK) == 0) {
 725                                         if (cmd == TYPECMD_SMALLV)
 726                                                 out1fmt("%s\n", argv[i]);
 727                                         else
 728                                                 out1fmt("%s is %s\n", argv[i],
 729                                                     argv[i]);
 730                                 } else {
 731                                         if (cmd != TYPECMD_SMALLV)
 732                                                 outfmt(out2, "%s: %s\n",
 733                                                     argv[i], strerror(errno));
 734                                         error1 |= 127;
 735                                 }
 736                         }
 737                         break;
 738                 }
 739                 case CMDFUNCTION:
 740                         if (cmd == TYPECMD_SMALLV)
 741                                 out1fmt("%s\n", argv[i]);
 742                         else
 743                                 out1fmt("%s is a shell function\n", argv[i]);
 744                         break;
 745
 746                 case CMDBUILTIN:
 747                         if (cmd == TYPECMD_SMALLV)
 748                                 out1fmt("%s\n", argv[i]);
 749                         else if (entry.special)
 750                                 out1fmt("%s is a special shell builtin\n",
 751                                     argv[i]);
 752                         else
 753                                 out1fmt("%s is a shell builtin\n", argv[i]);
 754                         break;
 755
 756                 default:
 757                         if (cmd != TYPECMD_SMALLV)
 758                                 outfmt(out2, "%s: not found\n", argv[i]);
 759                         error1 |= 127;
 760                         break;
 761                 }
 762         }
 763
 764         if (path != pathval())
 765                 clearcmdentry();
 766
 767         return error1;
 768 }
 769
 770 /*
 771  * Locate and print what a word is...
 772  */
 773
 774 int
 775 typecmd(int argc, char **argv)
 776 {
 777         if (argc > 2 && strcmp(argv[1], "--") == 0)
 778                 argc--, argv++;
 779         return typecmd_impl(argc, argv, TYPECMD_TYPE, bltinlookup("PATH", 1));
 780 }