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.
27 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
39 static void usage(void);
40 static int print_matches(char *, char *);
46 main(int argc, char **argv)
52 status = EXIT_SUCCESS;
54 while ((opt = getopt(argc, argv, "as")) != -1) {
74 if ((p = getenv("PATH")) == NULL)
76 pathlen = strlen(p) + 1;
77 path = malloc(pathlen);
79 err(EXIT_FAILURE, NULL);
82 memcpy(path, p, pathlen);
84 if (strlen(*argv) >= FILENAME_MAX ||
85 print_matches(path, *argv) == -1)
86 status = EXIT_FAILURE;
99 (void)fprintf(stderr, "usage: which [-as] program ...\n");
104 is_there(char *candidate)
108 /* XXX work around access(2) false positives for superuser */
109 if (access(candidate, X_OK) == 0 &&
110 stat(candidate, &fin) == 0 &&
111 S_ISREG(fin.st_mode) &&
113 (fin.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) != 0)) {
115 printf("%s\n", candidate);
122 print_matches(char *path, char *filename)
124 char candidate[PATH_MAX];
128 if (strchr(filename, '/') != NULL)
129 return (is_there(filename) ? 0 : -1);
131 while ((d = strsep(&path, ":")) != NULL) {
134 if (snprintf(candidate, sizeof(candidate), "%s/%s", d,
135 filename) >= (int)sizeof(candidate))
137 if (is_there(candidate)) {
143 return (found ? 0 : -1);