#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/which/which.c,v 1.6 2005/02/10 16:04:22 ru Exp $");
#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;
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);
}