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("$FreeBSD$");
32 #include <sys/param.h>
40 static void usage(void);
41 static int print_matches(char *, char *);
47 main(int argc, char **argv)
53 status = EXIT_SUCCESS;
55 while ((opt = getopt(argc, argv, "as")) != -1) {
75 if ((p = getenv("PATH")) == NULL)
77 pathlen = strlen(p) + 1;
78 path = malloc(pathlen);
80 err(EXIT_FAILURE, NULL);
83 memcpy(path, p, pathlen);
85 if (strlen(*argv) >= FILENAME_MAX ||
86 print_matches(path, *argv) == -1)
87 status = EXIT_FAILURE;
100 (void)fprintf(stderr, "usage: which [-as] program ...\n");
105 is_there(char *candidate)
109 /* XXX work around access(2) false positives for superuser */
110 if (access(candidate, X_OK) == 0 &&
111 stat(candidate, &fin) == 0 &&
112 S_ISREG(fin.st_mode) &&
114 (fin.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) != 0)) {
116 printf("%s\n", candidate);
123 print_matches(char *path, char *filename)
125 char candidate[PATH_MAX];
129 if (strchr(filename, '/') != NULL)
130 return (is_there(filename) ? 0 : -1);
132 while ((d = strsep(&path, ":")) != NULL) {
135 if (snprintf(candidate, sizeof(candidate), "%s/%s", d,
136 filename) >= (int)sizeof(candidate))
138 if (is_there(candidate)) {
144 return (found ? 0 : -1);