1 /* $OpenBSD: dirname.c,v 1.17 2019/01/25 00:19:26 millert Exp $ */
2
3 /*
4 * Copyright (c) 1997 Todd C. Miller <millert@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <err.h>
20 #include <libgen.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <unistd.h>
24
25 static void __dead usage(void);
26
27 int
main(int argc,char * argv[])28 main(int argc, char *argv[])
29 {
30 int ch;
31 char *dir;
32
33 if (pledge("stdio", NULL) == -1)
34 err(1, "pledge");
35
36 while ((ch = getopt(argc, argv, "")) != -1) {
37 switch (ch) {
38 default:
39 usage();
40 }
41 }
42 argc -= optind;
43 argv += optind;
44
45 if (argc != 1)
46 usage();
47
48 if ((dir = dirname(argv[0])) == NULL)
49 err(1, "%s", argv[0]);
50 puts(dir);
51 return 0;
52 }
53
54 extern char *__progname;
55
56 static void __dead
usage(void)57 usage(void)
58 {
59 (void)fprintf(stderr, "usage: %s pathname\n", __progname);
60 exit(1);
61 }
62