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  * 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 <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         int special;            /* flag for special builtin commands */
  88         short cmdtype;          /* index identifying command */
  89         char rehash;            /* if set, cd done since entry created */
  90         char cmdname[ARB];      /* name of command */
  91 };
  92
  93
  94 STATIC struct tblentry *cmdtable[CMDTABLESIZE];
  95 STATIC int builtinloc = -1;             /* index in path of %builtin, or -1 */
  96 int exerrno = 0;                        /* Last exec error */
  97
  98
  99 STATIC void tryexec(char *, char **, char **);
 100 STATIC void printentry(struct tblentry *, int);
 101 STATIC struct tblentry *cmdlookup(char *, int);
 102 STATIC void delete_cmd_entry(void);
 103
 104
 105
 106 /*
 107  * Exec a program.  Never returns.  If you change this routine, you may
 108  * have to change the find_command routine as well.
 109  */
 110
 111 void
 112 shellexec(char **argv, char **envp, char *path, int index)
 113 {
 114         char *cmdname;
 115         int e;
 116
 117         if (strchr(argv[0], '/') != NULL) {
 118                 tryexec(argv[0], argv, envp);
 119                 e = errno;
 120         } else {
 121                 e = ENOENT;
 122                 while ((cmdname = padvance(&path, argv[0])) != NULL) {
 123                         if (--index < 0 && pathopt == NULL) {
 124                                 tryexec(cmdname, argv, envp);
 125                                 if (errno != ENOENT && errno != ENOTDIR)
 126                                         e = errno;
 127                         }
 128                         stunalloc(cmdname);
 129                 }
 130         }
 131
 132         /* Map to POSIX errors */
 133         switch (e) {
 134         case EACCES:
 135                 exerrno = 126;
 136                 break;
 137         case ENOENT:
 138                 exerrno = 127;
 139                 break;
 140         default:
 141                 exerrno = 2;
 142                 break;
 143         }
 144         if (e == ENOENT || e == ENOTDIR)
 145                 exerror(EXEXEC, "%s: not found", argv[0]);
 146         exerror(EXEXEC, "%s: %s", argv[0], strerror(e));
 147 }
 148
 149
 150 STATIC void
 151 tryexec(char *cmd, char **argv, char **envp)
 152 {
 153         int e;
 154
 155         execve(cmd, argv, envp);
 156         e = errno;
 157         if (e == ENOEXEC) {
 158                 initshellproc();
 159                 setinputfile(cmd, 0);
 160                 commandname = arg0 = savestr(argv[0]);
 161                 setparam(argv + 1);
 162                 exraise(EXSHELLPROC);
 163                 /*NOTREACHED*/
 164         }
 165         errno = e;
 166 }
 167
 168 /*
 169  * Do a path search.  The variable path (passed by reference) should be
 170  * set to the start of the path before the first call; padvance will update
 171  * this value as it proceeds.  Successive calls to padvance will return
 172  * the possible path expansions in sequence.  If an option (indicated by
 173  * a percent sign) appears in the path entry then the global variable
 174  * pathopt will be set to point to it; otherwise pathopt will be set to
 175  * NULL.
 176  */
 177
 178 char *pathopt;
 179
 180 char *
 181 padvance(char **path, char *name)
 182 {
 183         char *p, *q;
 184         char *start;
 185         int len;
 186
 187         if (*path == NULL)
 188                 return NULL;
 189         start = *path;
 190         for (p = start; *p && *p != ':' && *p != '%'; p++)
 191                 ; /* nothing */
 192         len = p - start + strlen(name) + 2;     /* "2" is for '/' and '\0' */
 193         while (stackblocksize() < len)
 194                 growstackblock();
 195         q = stackblock();
 196         if (p != start) {
 197                 memcpy(q, start, p - start);
 198                 q += p - start;
 199                 *q++ = '/';
 200         }
 201         strcpy(q, name);
 202         pathopt = NULL;
 203         if (*p == '%') {
 204                 pathopt = ++p;
 205                 while (*p && *p != ':')  p++;
 206         }
 207         if (*p == ':')
 208                 *path = p + 1;
 209         else
 210                 *path = NULL;
 211         return stalloc(len);
 212 }
 213
 214
 215
 216 /*** Command hashing code ***/
 217
 218
 219 int
 220 hashcmd(int argc __unused, char **argv __unused)
 221 {
 222         struct tblentry **pp;
 223         struct tblentry *cmdp;
 224         int c;
 225         int verbose;
 226         struct cmdentry entry;
 227         char *name;
 228
 229         verbose = 0;
 230         while ((c = nextopt("rv")) != '\0') {
 231                 if (c == 'r') {
 232                         clearcmdentry(0);
 233                 } else if (c == 'v') {
 234                         verbose++;
 235                 }
 236         }
 237         if (*argptr == NULL) {
 238                 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
 239                         for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 240                                 if (cmdp->cmdtype == CMDNORMAL)
 241                                         printentry(cmdp, verbose);
 242                         }
 243                 }
 244                 return 0;
 245         }
 246         while ((name = *argptr) != NULL) {
 247                 if ((cmdp = cmdlookup(name, 0)) != NULL
 248                  && (cmdp->cmdtype == CMDNORMAL
 249                      || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
 250                         delete_cmd_entry();
 251                 find_command(name, &entry, 1, pathval());
 252                 if (verbose) {
 253                         if (entry.cmdtype != CMDUNKNOWN) {      /* if no error msg */
 254                                 cmdp = cmdlookup(name, 0);
 255                                 if (cmdp != NULL)
 256                                         printentry(cmdp, verbose);
 257                                 else
 258                                         outfmt(&errout, "%s: not found\n", name);
 259                         }
 260                         flushall();
 261                 }
 262                 argptr++;
 263         }
 264         return 0;
 265 }
 266
 267
 268 STATIC void
 269 printentry(struct tblentry *cmdp, int verbose)
 270 {
 271         int index;
 272         char *path;
 273         char *name;
 274
 275         if (cmdp->cmdtype == CMDNORMAL) {
 276                 index = cmdp->param.index;
 277                 path = pathval();
 278                 do {
 279                         name = padvance(&path, cmdp->cmdname);
 280                         stunalloc(name);
 281                 } while (--index >= 0);
 282                 out1str(name);
 283         } else if (cmdp->cmdtype == CMDBUILTIN) {
 284                 out1fmt("builtin %s", cmdp->cmdname);
 285         } else if (cmdp->cmdtype == CMDFUNCTION) {
 286                 out1fmt("function %s", cmdp->cmdname);
 287                 if (verbose) {
 288                         INTOFF;
 289                         name = commandtext(getfuncnode(cmdp->param.func));
 290                         out1c(' ');
 291                         out1str(name);
 292                         ckfree(name);
 293                         INTON;
 294                 }
 295 #ifdef DEBUG
 296         } else {
 297                 error("internal error: cmdtype %d", cmdp->cmdtype);
 298 #endif
 299         }
 300         if (cmdp->rehash)
 301                 out1c('*');
 302         out1c('\n');
 303 }
 304
 305
 306
 307 /*
 308  * Resolve a command name.  If you change this routine, you may have to
 309  * change the shellexec routine as well.
 310  */
 311
 312 void
 313 find_command(char *name, struct cmdentry *entry, int printerr, char *path)
 314 {
 315         struct tblentry *cmdp;
 316         int index;
 317         int prev;
 318         char *fullname;
 319         struct stat statb;
 320         int e;
 321         int i;
 322         int spec;
 323
 324         /* If name contains a slash, don't use the hash table */
 325         if (strchr(name, '/') != NULL) {
 326                 entry->cmdtype = CMDNORMAL;
 327                 entry->u.index = 0;
 328                 return;
 329         }
 330
 331         /* If name is in the table, and not invalidated by cd, we're done */
 332         if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0)
 333                 goto success;
 334
 335         /* If %builtin not in path, check for builtin next */
 336         if (builtinloc < 0 && (i = find_builtin(name, &spec)) >= 0) {
 337                 INTOFF;
 338                 cmdp = cmdlookup(name, 1);
 339                 cmdp->cmdtype = CMDBUILTIN;
 340                 cmdp->param.index = i;
 341                 cmdp->special = spec;
 342                 INTON;
 343                 goto success;
 344         }
 345
 346         /* We have to search path. */
 347         prev = -1;              /* where to start */
 348         if (cmdp) {             /* doing a rehash */
 349                 if (cmdp->cmdtype == CMDBUILTIN)
 350                         prev = builtinloc;
 351                 else
 352                         prev = cmdp->param.index;
 353         }
 354
 355         e = ENOENT;
 356         index = -1;
 357 loop:
 358         while ((fullname = padvance(&path, name)) != NULL) {
 359                 stunalloc(fullname);
 360                 index++;
 361                 if (pathopt) {
 362                         if (prefix("builtin", pathopt)) {
 363                                 if ((i = find_builtin(name, &spec)) < 0)
 364                                         goto loop;
 365                                 INTOFF;
 366                                 cmdp = cmdlookup(name, 1);
 367                                 cmdp->cmdtype = CMDBUILTIN;
 368                                 cmdp->param.index = i;
 369                                 cmdp->special = spec;
 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         entry->special = cmdp->special;
 439 }
 440
 441
 442
 443 /*
 444  * Search the table of builtin commands.
 445  */
 446
 447 int
 448 find_builtin(char *name, int *special)
 449 {
 450         const struct builtincmd *bp;
 451
 452         for (bp = builtincmd ; bp->name ; bp++) {
 453                 if (*bp->name == *name && equal(bp->name, name)) {
 454                         *special = bp->special;
 455                         return bp->code;
 456                 }
 457         }
 458         return -1;
 459 }
 460
 461
 462
 463 /*
 464  * Called when a cd is done.  Marks all commands so the next time they
 465  * are executed they will be rehashed.
 466  */
 467
 468 void
 469 hashcd(void)
 470 {
 471         struct tblentry **pp;
 472         struct tblentry *cmdp;
 473
 474         for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
 475                 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 476                         if (cmdp->cmdtype == CMDNORMAL
 477                          || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
 478                                 cmdp->rehash = 1;
 479                 }
 480         }
 481 }
 482
 483
 484
 485 /*
 486  * Called before PATH is changed.  The argument is the new value of PATH;
 487  * pathval() still returns the old value at this point.  Called with
 488  * interrupts off.
 489  */
 490
 491 void
 492 changepath(const char *newval)
 493 {
 494         const char *old, *new;
 495         int index;
 496         int firstchange;
 497         int bltin;
 498
 499         old = pathval();
 500         new = newval;
 501         firstchange = 9999;     /* assume no change */
 502         index = 0;
 503         bltin = -1;
 504         for (;;) {
 505                 if (*old != *new) {
 506                         firstchange = index;
 507                         if ((*old == '\0' && *new == ':')
 508                          || (*old == ':' && *new == '\0'))
 509                                 firstchange++;
 510                         old = new;      /* ignore subsequent differences */
 511                 }
 512                 if (*new == '\0')
 513                         break;
 514                 if (*new == '%' && bltin < 0 && prefix("builtin", new + 1))
 515                         bltin = index;
 516                 if (*new == ':') {
 517                         index++;
 518                 }
 519                 new++, old++;
 520         }
 521         if (builtinloc < 0 && bltin >= 0)
 522                 builtinloc = bltin;             /* zap builtins */
 523         if (builtinloc >= 0 && bltin < 0)
 524                 firstchange = 0;
 525         clearcmdentry(firstchange);
 526         builtinloc = bltin;
 527 }
 528
 529
 530 /*
 531  * Clear out command entries.  The argument specifies the first entry in
 532  * PATH which has changed.
 533  */
 534
 535 void
 536 clearcmdentry(int firstchange)
 537 {
 538         struct tblentry **tblp;
 539         struct tblentry **pp;
 540         struct tblentry *cmdp;
 541
 542         INTOFF;
 543         for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
 544                 pp = tblp;
 545                 while ((cmdp = *pp) != NULL) {
 546                         if ((cmdp->cmdtype == CMDNORMAL &&
 547                              cmdp->param.index >= firstchange)
 548                          || (cmdp->cmdtype == CMDBUILTIN &&
 549                              builtinloc >= firstchange)) {
 550                                 *pp = cmdp->next;
 551                                 ckfree(cmdp);
 552                         } else {
 553                                 pp = &cmdp->next;
 554                         }
 555                 }
 556         }
 557         INTON;
 558 }
 559
 560
 561 /*
 562  * Delete all functions.
 563  */
 564
 565 #ifdef mkinit
 566 MKINIT void deletefuncs(void);
 567
 568 SHELLPROC {
 569         deletefuncs();
 570 }
 571 #endif
 572
 573 void
 574 deletefuncs(void)
 575 {
 576         struct tblentry **tblp;
 577         struct tblentry **pp;
 578         struct tblentry *cmdp;
 579
 580         INTOFF;
 581         for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
 582                 pp = tblp;
 583                 while ((cmdp = *pp) != NULL) {
 584                         if (cmdp->cmdtype == CMDFUNCTION) {
 585                                 *pp = cmdp->next;
 586                                 unreffunc(cmdp->param.func);
 587                                 ckfree(cmdp);
 588                         } else {
 589                                 pp = &cmdp->next;
 590                         }
 591                 }
 592         }
 593         INTON;
 594 }
 595
 596
 597
 598 /*
 599  * Locate a command in the command hash table.  If "add" is nonzero,
 600  * add the command to the table if it is not already present.  The
 601  * variable "lastcmdentry" is set to point to the address of the link
 602  * pointing to the entry, so that delete_cmd_entry can delete the
 603  * entry.
 604  */
 605
 606 STATIC struct tblentry **lastcmdentry;
 607
 608
 609 STATIC struct tblentry *
 610 cmdlookup(char *name, int add)
 611 {
 612         int hashval;
 613         char *p;
 614         struct tblentry *cmdp;
 615         struct tblentry **pp;
 616
 617         p = name;
 618         hashval = *p << 4;
 619         while (*p)
 620                 hashval += *p++;
 621         hashval &= 0x7FFF;
 622         pp = &cmdtable[hashval % CMDTABLESIZE];
 623         for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 624                 if (equal(cmdp->cmdname, name))
 625                         break;
 626                 pp = &cmdp->next;
 627         }
 628         if (add && cmdp == NULL) {
 629                 INTOFF;
 630                 cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
 631                                         + strlen(name) + 1);
 632                 cmdp->next = NULL;
 633                 cmdp->cmdtype = CMDUNKNOWN;
 634                 cmdp->rehash = 0;
 635                 strcpy(cmdp->cmdname, name);
 636                 INTON;
 637         }
 638         lastcmdentry = pp;
 639         return cmdp;
 640 }
 641
 642 /*
 643  * Delete the command entry returned on the last lookup.
 644  */
 645
 646 STATIC void
 647 delete_cmd_entry(void)
 648 {
 649         struct tblentry *cmdp;
 650
 651         INTOFF;
 652         cmdp = *lastcmdentry;
 653         *lastcmdentry = cmdp->next;
 654         ckfree(cmdp);
 655         INTON;
 656 }
 657
 658
 659
 660 /*
 661  * Add a new command entry, replacing any existing command entry for
 662  * the same name.
 663  */
 664
 665 void
 666 addcmdentry(char *name, struct cmdentry *entry)
 667 {
 668         struct tblentry *cmdp;
 669
 670         INTOFF;
 671         cmdp = cmdlookup(name, 1);
 672         if (cmdp->cmdtype == CMDFUNCTION) {
 673                 unreffunc(cmdp->param.func);
 674         }
 675         cmdp->cmdtype = entry->cmdtype;
 676         cmdp->param = entry->u;
 677         INTON;
 678 }
 679
 680
 681 /*
 682  * Define a shell function.
 683  */
 684
 685 void
 686 defun(char *name, union node *func)
 687 {
 688         struct cmdentry entry;
 689
 690         INTOFF;
 691         entry.cmdtype = CMDFUNCTION;
 692         entry.u.func = copyfunc(func);
 693         addcmdentry(name, &entry);
 694         INTON;
 695 }
 696
 697
 698 /*
 699  * Delete a function if it exists.
 700  */
 701
 702 int
 703 unsetfunc(char *name)
 704 {
 705         struct tblentry *cmdp;
 706
 707         if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
 708                 unreffunc(cmdp->param.func);
 709                 delete_cmd_entry();
 710                 return (0);
 711         }
 712         return (0);
 713 }
 714
 715 /*
 716  * Shared code for the following builtin commands:
 717  *    type, command -v, command -V
 718  */
 719
 720 int
 721 typecmd_impl(int argc, char **argv, int cmd)
 722 {
 723         struct cmdentry entry;
 724         struct tblentry *cmdp;
 725         char **pp;
 726         struct alias *ap;
 727         int i;
 728         int error = 0;
 729         extern char *const parsekwd[];
 730
 731         for (i = 1; i < argc; i++) {
 732                 /* First look at the keywords */
 733                 for (pp = (char **)parsekwd; *pp; pp++)
 734                         if (**pp == *argv[i] && equal(*pp, argv[i]))
 735                                 break;
 736
 737                 if (*pp) {
 738                         if (cmd == TYPECMD_SMALLV)
 739                                 out1fmt("%s\n", argv[i]);
 740                         else
 741                                 out1fmt("%s is a shell keyword\n", argv[i]);
 742                         continue;
 743                 }
 744
 745                 /* Then look at the aliases */
 746                 if ((ap = lookupalias(argv[i], 1)) != NULL) {
 747                         if (cmd == TYPECMD_SMALLV)
 748                                 out1fmt("alias %s='%s'\n", argv[i], ap->val);
 749                         else
 750                                 out1fmt("%s is an alias for %s\n", argv[i],
 751                                     ap->val);
 752                         continue;
 753                 }
 754
 755                 /* Then check if it is a tracked alias */
 756                 if ((cmdp = cmdlookup(argv[i], 0)) != NULL) {
 757                         entry.cmdtype = cmdp->cmdtype;
 758                         entry.u = cmdp->param;
 759                         entry.special = cmdp->special;
 760                 }
 761                 else {
 762                         /* Finally use brute force */
 763                         find_command(argv[i], &entry, 0, pathval());
 764                 }
 765
 766                 switch (entry.cmdtype) {
 767                 case CMDNORMAL: {
 768                         if (strchr(argv[i], '/') == NULL) {
 769                                 char *path = pathval(), *name;
 770                                 int j = entry.u.index;
 771                                 do {
 772                                         name = padvance(&path, argv[i]);
 773                                         stunalloc(name);
 774                                 } while (--j >= 0);
 775                                 if (cmd == TYPECMD_SMALLV)
 776                                         out1fmt("%s\n", name);
 777                                 else
 778                                         out1fmt("%s is%s %s\n", argv[i],
 779                                             (cmdp && cmd == TYPECMD_TYPE) ?
 780                                                 " a tracked alias for" : "",
 781                                             name);
 782                         } else {
 783                                 if (eaccess(argv[i], X_OK) == 0) {
 784                                         if (cmd == TYPECMD_SMALLV)
 785                                                 out1fmt("%s\n", argv[i]);
 786                                         else
 787                                                 out1fmt("%s is %s\n", argv[i],
 788                                                     argv[i]);
 789                                 } else {
 790                                         if (cmd != TYPECMD_SMALLV)
 791                                                 outfmt(out2, "%s: %s\n",
 792                                                     argv[i], strerror(errno));
 793                                         error |= 127;
 794                                 }
 795                         }
 796                         break;
 797                 }
 798                 case CMDFUNCTION:
 799                         if (cmd == TYPECMD_SMALLV)
 800                                 out1fmt("%s\n", argv[i]);
 801                         else
 802                                 out1fmt("%s is a shell function\n", argv[i]);
 803                         break;
 804
 805                 case CMDBUILTIN:
 806                         if (cmd == TYPECMD_SMALLV)
 807                                 out1fmt("%s\n", argv[i]);
 808                         else if (entry.special)
 809                                 out1fmt("%s is a special shell builtin\n",
 810                                     argv[i]);
 811                         else
 812                                 out1fmt("%s is a shell builtin\n", argv[i]);
 813                         break;
 814
 815                 default:
 816                         if (cmd != TYPECMD_SMALLV)
 817                                 outfmt(out2, "%s: not found\n", argv[i]);
 818                         error |= 127;
 819                         break;
 820                 }
 821         }
 822         return error;
 823 }
 824
 825 /*
 826  * Locate and print what a word is...
 827  */
 828
 829 int
 830 typecmd(int argc, char **argv)
 831 {
 832         return typecmd_impl(argc, argv, TYPECMD_TYPE);
 833 }