mirror of
https://git.FreeBSD.org/src.git
synced 2024-11-27 08:00:11 +00:00
147 lines
3.4 KiB
C
147 lines
3.4 KiB
C
/**
|
|
* Copyright (c) 2000 Dan Papasian. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/stat.h>
|
|
#include <sys/param.h>
|
|
|
|
#include <err.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
static void usage(void);
|
|
static int print_matches(char *, char *);
|
|
|
|
int silent;
|
|
int allpaths;
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
char *p, *path;
|
|
ssize_t pathlen;
|
|
int opt, status;
|
|
|
|
status = EXIT_SUCCESS;
|
|
|
|
while ((opt = getopt(argc, argv, "as")) != -1) {
|
|
switch (opt) {
|
|
case 'a':
|
|
allpaths = 1;
|
|
break;
|
|
case 's':
|
|
silent = 1;
|
|
break;
|
|
default:
|
|
usage();
|
|
break;
|
|
}
|
|
}
|
|
|
|
argv += optind;
|
|
argc -= optind;
|
|
|
|
if (argc == 0)
|
|
usage();
|
|
|
|
if ((p = getenv("PATH")) == NULL)
|
|
exit(EXIT_FAILURE);
|
|
pathlen = strlen(p) + 1;
|
|
path = malloc(pathlen);
|
|
if (path == NULL)
|
|
err(EXIT_FAILURE, NULL);
|
|
|
|
while (argc > 0) {
|
|
memcpy(path, p, pathlen);
|
|
|
|
if (strlen(*argv) >= FILENAME_MAX ||
|
|
print_matches(path, *argv) == -1)
|
|
status = EXIT_FAILURE;
|
|
|
|
argv++;
|
|
argc--;
|
|
}
|
|
|
|
exit(status);
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
|
|
(void)fprintf(stderr, "usage: which [-as] program ...\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
static int
|
|
is_there(char *candidate)
|
|
{
|
|
struct stat fin;
|
|
|
|
/* XXX work around access(2) false positives for superuser */
|
|
if (access(candidate, X_OK) == 0 &&
|
|
stat(candidate, &fin) == 0 &&
|
|
S_ISREG(fin.st_mode) &&
|
|
(getuid() != 0 ||
|
|
(fin.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) != 0)) {
|
|
if (!silent)
|
|
printf("%s\n", candidate);
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
print_matches(char *path, char *filename)
|
|
{
|
|
char candidate[PATH_MAX];
|
|
const char *d;
|
|
int found;
|
|
|
|
if (strchr(filename, '/') != NULL)
|
|
return (is_there(filename) ? 0 : -1);
|
|
found = 0;
|
|
while ((d = strsep(&path, ":")) != NULL) {
|
|
if (*d == '\0')
|
|
d = ".";
|
|
if (snprintf(candidate, sizeof(candidate), "%s/%s", d,
|
|
filename) >= (int)sizeof(candidate))
|
|
continue;
|
|
if (is_there(candidate)) {
|
|
found = 1;
|
|
if (!allpaths)
|
|
break;
|
|
}
|
|
}
|
|
return (found ? 0 : -1);
|
|
}
|
|
|