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         len = p - start + strlen(name) + 2;     /* "2" is for '/' and '\0' */
 192         while (stackblocksize() < len)
 193                 growstackblock();
 194         q = stackblock();
 195         if (p != start) {
 196                 memcpy(q, start, p - start);
 197                 q += p - start;
 198                 *q++ = '/';
 199         }
 200         strcpy(q, name);
 201         pathopt = NULL;
 202         if (*p == '%') {
 203                 pathopt = ++p;
 204                 while (*p && *p != ':')  p++;
 205         }
 206         if (*p == ':')
 207                 *path = p + 1;
 208         else
 209                 *path = NULL;
 210         return stalloc(len);
 211 }
 212
 213
 214
 215 /*** Command hashing code ***/
 216
 217
 218 int
 219 hashcmd(int argc __unused, char **argv __unused)
 220 {
 221         struct tblentry **pp;
 222         struct tblentry *cmdp;
 223         int c;
 224         int verbose;
 225         struct cmdentry entry;
 226         char *name;
 227
 228         verbose = 0;
 229         while ((c = nextopt("rv")) != '\0') {
 230                 if (c == 'r') {
 231                         clearcmdentry(0);
 232                 } else if (c == 'v') {
 233                         verbose++;
 234                 }
 235         }
 236         if (*argptr == NULL) {
 237                 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
 238                         for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 239                                 if (cmdp->cmdtype == CMDNORMAL)
 240                                         printentry(cmdp, verbose);
 241                         }
 242                 }
 243                 return 0;
 244         }
 245         while ((name = *argptr) != NULL) {
 246                 if ((cmdp = cmdlookup(name, 0)) != NULL
 247                  && (cmdp->cmdtype == CMDNORMAL
 248                      || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
 249                         delete_cmd_entry();
 250                 find_command(name, &entry, 1, pathval());
 251                 if (verbose) {
 252                         if (entry.cmdtype != CMDUNKNOWN) {      /* if no error msg */
 253                                 cmdp = cmdlookup(name, 0);
 254                                 if (cmdp != NULL)
 255                                         printentry(cmdp, verbose);
 256                                 else
 257                                         outfmt(&errout, "%s: not found\n", name);
 258                         }
 259                         flushall();
 260                 }
 261                 argptr++;
 262         }
 263         return 0;
 264 }
 265
 266
 267 STATIC void
 268 printentry(struct tblentry *cmdp, int verbose)
 269 {
 270         int index;
 271         char *path;
 272         char *name;
 273
 274         if (cmdp->cmdtype == CMDNORMAL) {
 275                 index = cmdp->param.index;
 276                 path = pathval();
 277                 do {
 278                         name = padvance(&path, cmdp->cmdname);
 279                         stunalloc(name);
 280                 } while (--index >= 0);
 281                 out1str(name);
 282         } else if (cmdp->cmdtype == CMDBUILTIN) {
 283                 out1fmt("builtin %s", cmdp->cmdname);
 284         } else if (cmdp->cmdtype == CMDFUNCTION) {
 285                 out1fmt("function %s", cmdp->cmdname);
 286                 if (verbose) {
 287                         INTOFF;
 288                         name = commandtext(cmdp->param.func);
 289                         out1c(' ');
 290                         out1str(name);
 291                         ckfree(name);
 292                         INTON;
 293                 }
 294 #ifdef DEBUG
 295         } else {
 296                 error("internal error: cmdtype %d", cmdp->cmdtype);
 297 #endif
 298         }
 299         if (cmdp->rehash)
 300                 out1c('*');
 301         out1c('\n');
 302 }
 303
 304
 305
 306 /*
 307  * Resolve a command name.  If you change this routine, you may have to
 308  * change the shellexec routine as well.
 309  */
 310
 311 void
 312 find_command(char *name, struct cmdentry *entry, int printerr, char *path)
 313 {
 314         struct tblentry *cmdp;
 315         int index;
 316         int prev;
 317         char *fullname;
 318         struct stat statb;
 319         int e;
 320         int i;
 321         int spec;
 322
 323         /* If name contains a slash, don't use the hash table */
 324         if (strchr(name, '/') != NULL) {
 325                 entry->cmdtype = CMDNORMAL;
 326                 entry->u.index = 0;
 327                 return;
 328         }
 329
 330         /* If name is in the table, and not invalidated by cd, we're done */
 331         if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0)
 332                 goto success;
 333
 334         /* If %builtin not in path, check for builtin next */
 335         if (builtinloc < 0 && (i = find_builtin(name, &spec)) >= 0) {
 336                 INTOFF;
 337                 cmdp = cmdlookup(name, 1);
 338                 cmdp->cmdtype = CMDBUILTIN;
 339                 cmdp->param.index = i;
 340                 cmdp->special = spec;
 341                 INTON;
 342                 goto success;
 343         }
 344
 345         /* We have to search path. */
 346         prev = -1;              /* where to start */
 347         if (cmdp) {             /* doing a rehash */
 348                 if (cmdp->cmdtype == CMDBUILTIN)
 349                         prev = builtinloc;
 350                 else
 351                         prev = cmdp->param.index;
 352         }
 353
 354         e = ENOENT;
 355         index = -1;
 356 loop:
 357         while ((fullname = padvance(&path, name)) != NULL) {
 358                 stunalloc(fullname);
 359                 index++;
 360                 if (pathopt) {
 361                         if (prefix("builtin", pathopt)) {
 362                                 if ((i = find_builtin(name, &spec)) < 0)
 363                                         goto loop;
 364                                 INTOFF;
 365                                 cmdp = cmdlookup(name, 1);
 366                                 cmdp->cmdtype = CMDBUILTIN;
 367                                 cmdp->param.index = i;
 368                                 cmdp->special = spec;
 369                                 INTON;
 370                                 goto success;
 371                         } else if (prefix("func", pathopt)) {
 372                                 /* handled below */
 373                         } else {
 374                                 goto loop;      /* ignore unimplemented options */
 375                         }
 376                 }
 377                 /* if rehash, don't redo absolute path names */
 378                 if (fullname[0] == '/' && index <= prev) {
 379                         if (index < prev)
 380                                 goto loop;
 381                         TRACE(("searchexec \"%s\": no change\n", name));
 382                         goto success;
 383                 }
 384                 if (stat(fullname, &statb) < 0) {
 385                         if (errno != ENOENT && errno != ENOTDIR)
 386                                 e = errno;
 387                         goto loop;
 388                 }
 389                 e = EACCES;     /* if we fail, this will be the error */
 390                 if (!S_ISREG(statb.st_mode))
 391                         goto loop;
 392                 if (pathopt) {          /* this is a %func directory */
 393                         stalloc(strlen(fullname) + 1);
 394                         readcmdfile(fullname);
 395                         if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION)
 396                                 error("%s not defined in %s", name, fullname);
 397                         stunalloc(fullname);
 398                         goto success;
 399                 }
 400 #ifdef notdef
 401                 if (statb.st_uid == geteuid()) {
 402                         if ((statb.st_mode & 0100) == 0)
 403                                 goto loop;
 404                 } else if (statb.st_gid == getegid()) {
 405                         if ((statb.st_mode & 010) == 0)
 406                                 goto loop;
 407                 } else {
 408                         if ((statb.st_mode & 01) == 0)
 409                                 goto loop;
 410                 }
 411 #endif
 412                 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
 413                 INTOFF;
 414                 cmdp = cmdlookup(name, 1);
 415                 cmdp->cmdtype = CMDNORMAL;
 416                 cmdp->param.index = index;
 417                 INTON;
 418                 goto success;
 419         }
 420
 421         /* We failed.  If there was an entry for this command, delete it */
 422         if (cmdp)
 423                 delete_cmd_entry();
 424         if (printerr) {
 425                 if (e == ENOENT || e == ENOTDIR)
 426                         outfmt(out2, "%s: not found\n", name);
 427                 else
 428                         outfmt(out2, "%s: %s\n", name, strerror(e));
 429         }
 430         entry->cmdtype = CMDUNKNOWN;
 431         return;
 432
 433 success:
 434         cmdp->rehash = 0;
 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(char *name, int *special)
 448 {
 449         const struct builtincmd *bp;
 450
 451         for (bp = builtincmd ; bp->name ; bp++) {
 452                 if (*bp->name == *name && equal(bp->name, name)) {
 453                         *special = bp->special;
 454                         return bp->code;
 455                 }
 456         }
 457         return -1;
 458 }
 459
 460
 461
 462 /*
 463  * Called when a cd is done.  Marks all commands so the next time they
 464  * are executed they will be rehashed.
 465  */
 466
 467 void
 468 hashcd(void)
 469 {
 470         struct tblentry **pp;
 471         struct tblentry *cmdp;
 472
 473         for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
 474                 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 475                         if (cmdp->cmdtype == CMDNORMAL
 476                          || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
 477                                 cmdp->rehash = 1;
 478                 }
 479         }
 480 }
 481
 482
 483
 484 /*
 485  * Called before PATH is changed.  The argument is the new value of PATH;
 486  * pathval() still returns the old value at this point.  Called with
 487  * interrupts off.
 488  */
 489
 490 void
 491 changepath(const char *newval)
 492 {
 493         const char *old, *new;
 494         int index;
 495         int firstchange;
 496         int bltin;
 497
 498         old = pathval();
 499         new = newval;
 500         firstchange = 9999;     /* assume no change */
 501         index = 0;
 502         bltin = -1;
 503         for (;;) {
 504                 if (*old != *new) {
 505                         firstchange = index;
 506                         if ((*old == '\0' && *new == ':')
 507                          || (*old == ':' && *new == '\0'))
 508                                 firstchange++;
 509                         old = new;      /* ignore subsequent differences */
 510                 }
 511                 if (*new == '\0')
 512                         break;
 513                 if (*new == '%' && bltin < 0 && prefix("builtin", new + 1))
 514                         bltin = index;
 515                 if (*new == ':') {
 516                         index++;
 517                 }
 518                 new++, old++;
 519         }
 520         if (builtinloc < 0 && bltin >= 0)
 521                 builtinloc = bltin;             /* zap builtins */
 522         if (builtinloc >= 0 && bltin < 0)
 523                 firstchange = 0;
 524         clearcmdentry(firstchange);
 525         builtinloc = bltin;
 526 }
 527
 528
 529 /*
 530  * Clear out command entries.  The argument specifies the first entry in
 531  * PATH which has changed.
 532  */
 533
 534 void
 535 clearcmdentry(int firstchange)
 536 {
 537         struct tblentry **tblp;
 538         struct tblentry **pp;
 539         struct tblentry *cmdp;
 540
 541         INTOFF;
 542         for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
 543                 pp = tblp;
 544                 while ((cmdp = *pp) != NULL) {
 545                         if ((cmdp->cmdtype == CMDNORMAL &&
 546                              cmdp->param.index >= firstchange)
 547                          || (cmdp->cmdtype == CMDBUILTIN &&
 548                              builtinloc >= firstchange)) {
 549                                 *pp = cmdp->next;
 550                                 ckfree(cmdp);
 551                         } else {
 552                                 pp = &cmdp->next;
 553                         }
 554                 }
 555         }
 556         INTON;
 557 }
 558
 559
 560 /*
 561  * Delete all functions.
 562  */
 563
 564 #ifdef mkinit
 565 MKINIT void deletefuncs(void);
 566
 567 SHELLPROC {
 568         deletefuncs();
 569 }
 570 #endif
 571
 572 void
 573 deletefuncs(void)
 574 {
 575         struct tblentry **tblp;
 576         struct tblentry **pp;
 577         struct tblentry *cmdp;
 578
 579         INTOFF;
 580         for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
 581                 pp = tblp;
 582                 while ((cmdp = *pp) != NULL) {
 583                         if (cmdp->cmdtype == CMDFUNCTION) {
 584                                 *pp = cmdp->next;
 585                                 freefunc(cmdp->param.func);
 586                                 ckfree(cmdp);
 587                         } else {
 588                                 pp = &cmdp->next;
 589                         }
 590                 }
 591         }
 592         INTON;
 593 }
 594
 595
 596
 597 /*
 598  * Locate a command in the command hash table.  If "add" is nonzero,
 599  * add the command to the table if it is not already present.  The
 600  * variable "lastcmdentry" is set to point to the address of the link
 601  * pointing to the entry, so that delete_cmd_entry can delete the
 602  * entry.
 603  */
 604
 605 STATIC struct tblentry **lastcmdentry;
 606
 607
 608 STATIC struct tblentry *
 609 cmdlookup(char *name, int add)
 610 {
 611         int hashval;
 612         char *p;
 613         struct tblentry *cmdp;
 614         struct tblentry **pp;
 615
 616         p = name;
 617         hashval = *p << 4;
 618         while (*p)
 619                 hashval += *p++;
 620         hashval &= 0x7FFF;
 621         pp = &cmdtable[hashval % CMDTABLESIZE];
 622         for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
 623                 if (equal(cmdp->cmdname, name))
 624                         break;
 625                 pp = &cmdp->next;
 626         }
 627         if (add && cmdp == NULL) {
 628                 INTOFF;
 629                 cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
 630                                         + strlen(name) + 1);
 631                 cmdp->next = NULL;
 632                 cmdp->cmdtype = CMDUNKNOWN;
 633                 cmdp->rehash = 0;
 634                 strcpy(cmdp->cmdname, name);
 635                 INTON;
 636         }
 637         lastcmdentry = pp;
 638         return cmdp;
 639 }
 640
 641 /*
 642  * Delete the command entry returned on the last lookup.
 643  */
 644
 645 STATIC void
 646 delete_cmd_entry(void)
 647 {
 648         struct tblentry *cmdp;
 649
 650         INTOFF;
 651         cmdp = *lastcmdentry;
 652         *lastcmdentry = cmdp->next;
 653         ckfree(cmdp);
 654         INTON;
 655 }
 656
 657
 658
 659 /*
 660  * Add a new command entry, replacing any existing command entry for
 661  * the same name.
 662  */
 663
 664 void
 665 addcmdentry(char *name, struct cmdentry *entry)
 666 {
 667         struct tblentry *cmdp;
 668
 669         INTOFF;
 670         cmdp = cmdlookup(name, 1);
 671         if (cmdp->cmdtype == CMDFUNCTION) {
 672                 freefunc(cmdp->param.func);
 673         }
 674         cmdp->cmdtype = entry->cmdtype;
 675         cmdp->param = entry->u;
 676         INTON;
 677 }
 678
 679
 680 /*
 681  * Define a shell function.
 682  */
 683
 684 void
 685 defun(char *name, union node *func)
 686 {
 687         struct cmdentry entry;
 688
 689         INTOFF;
 690         entry.cmdtype = CMDFUNCTION;
 691         entry.u.func = copyfunc(func);
 692         addcmdentry(name, &entry);
 693         INTON;
 694 }
 695
 696
 697 /*
 698  * Delete a function if it exists.
 699  */
 700
 701 int
 702 unsetfunc(char *name)
 703 {
 704         struct tblentry *cmdp;
 705
 706         if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
 707                 freefunc(cmdp->param.func);
 708                 delete_cmd_entry();
 709                 return (0);
 710         }
 711         return (0);
 712 }
 713
 714 /*
 715  * Shared code for the following builtin commands:
 716  *    type, command -v, command -V
 717  */
 718
 719 int
 720 typecmd_impl(int argc, char **argv, int cmd)
 721 {
 722         struct cmdentry entry;
 723         struct tblentry *cmdp;
 724         char **pp;
 725         struct alias *ap;
 726         int i;
 727         int error = 0;
 728         extern char *const parsekwd[];
 729
 730         for (i = 1; i < argc; i++) {
 731                 if (cmd != TYPECMD_SMALLV)
 732                         out1str(argv[i]);
 733
 734                 /* First look at the keywords */
 735                 for (pp = (char **)parsekwd; *pp; pp++)
 736                         if (**pp == *argv[i] && equal(*pp, argv[i]))
 737                                 break;
 738
 739                 if (*pp) {
 740                         if (cmd == TYPECMD_SMALLV)
 741                                 out1fmt("%s\n", argv[i]);
 742                         else
 743                                 out1str(" is a shell keyword\n");
 744                         continue;
 745                 }
 746
 747                 /* Then look at the aliases */
 748                 if ((ap = lookupalias(argv[i], 1)) != NULL) {
 749                         if (cmd == TYPECMD_SMALLV)
 750                                 out1fmt("alias %s='%s'\n", argv[i], ap->val);
 751                         else
 752                                 out1fmt(" is an alias for %s\n", ap->val);
 753                         continue;
 754                 }
 755
 756                 /* Then check if it is a tracked alias */
 757                 if ((cmdp = cmdlookup(argv[i], 0)) != NULL) {
 758                         entry.cmdtype = cmdp->cmdtype;
 759                         entry.u = cmdp->param;
 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(" is%s %s\n",
 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(" is %s\n", argv[i]);
 788                                 } else {
 789                                         if (cmd != TYPECMD_SMALLV)
 790                                                 out1fmt(": %s\n",
 791                                                     strerror(errno));
 792                                         error |= 127;
 793                                 }
 794                         }
 795                         break;
 796                 }
 797                 case CMDFUNCTION:
 798                         if (cmd == TYPECMD_SMALLV)
 799                                 out1fmt("%s\n", argv[i]);
 800                         else
 801                                 out1str(" is a shell function\n");
 802                         break;
 803
 804                 case CMDBUILTIN:
 805                         if (cmd == TYPECMD_SMALLV)
 806                                 out1fmt("%s\n", argv[i]);
 807                         else
 808                                 out1str(" is a shell builtin\n");
 809                         break;
 810
 811                 default:
 812                         if (cmd != TYPECMD_SMALLV)
 813                                 out1str(": not found\n");
 814                         error |= 127;
 815                         break;
 816                 }
 817         }
 818         return error;
 819 }
 820
 821 /*
 822  * Locate and print what a word is...
 823  */
 824
 825 int
 826 typecmd(int argc, char **argv)
 827 {
 828         return typecmd_impl(argc, argv, TYPECMD_TYPE);
 829 }