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