2 * Copyright (c) 2000 Dan Papasian. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 * $FreeBSD: src/usr.bin/which/which.c,v 1.5 2002/06/30 06:02:39 tjr Exp $");
26 * $DragonFly: src/usr.bin/which/which.c,v 1.1 2004/03/25 16:18:40 drhodus Exp $
29 #include <sys/cdefs.h>
33 #include <sys/param.h>
41 static void usage(void);
42 static int print_matches(char *, char *);
48 main(int argc, char **argv)
54 status = EXIT_SUCCESS;
56 /* If called without args, die silently to conform */
60 while ((opt = getopt(argc, argv, "as")) != -1) {
77 if ((p = getenv("PATH")) == NULL)
79 pathlen = strlen(p) + 1;
80 path = malloc(pathlen);
82 err(EXIT_FAILURE, NULL);
85 status = EXIT_FAILURE;
88 memcpy(path, p, pathlen);
90 if (strlen(*argv) >= FILENAME_MAX ||
91 print_matches(path, *argv) == -1)
92 status = EXIT_FAILURE;
105 errx(EXIT_FAILURE, "usage: which [-as] program ...");
109 is_there(char *candidate)
113 /* XXX work around access(2) false positives for superuser */
114 if (access(candidate, X_OK) == 0 &&
115 stat(candidate, &fin) == 0 &&
116 S_ISREG(fin.st_mode) &&
118 (fin.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) != 0)) {
120 printf("%s\n", candidate);
127 print_matches(char *path, char *filename)
129 char candidate[PATH_MAX];
133 if (strchr(filename, '/') != NULL)
134 return (is_there(filename) ? 0 : -1);
136 while ((d = strsep(&path, ":")) != NULL) {
139 if (snprintf(candidate, sizeof(candidate), "%s/%s", d,
140 filename) >= (int)sizeof(candidate))
142 if (is_there(candidate)) {
148 return (found ? 0 : -1);