1 /* $OpenBSD: realpath.c,v 1.1 2021/10/13 15:04:53 kn Exp $ */
2 /*
3 * Copyright (c) 2021 Klemens Nanni <kn@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include <err.h>
19 #include <limits.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <unistd.h>
23
24 void __dead
usage(void)25 usage(void)
26 {
27 fprintf(stderr, "usage: %s [-q] file\n", getprogname());
28 exit(1);
29 }
30
31 int
main(int argc,char * argv[])32 main(int argc, char *argv[])
33 {
34 int ch, qflag = 0;
35 char *buf;
36
37 if (pledge("stdio rpath", NULL) == -1)
38 err(1, "pledge");
39
40 while ((ch = getopt(argc, argv, "q")) != -1) {
41 switch (ch) {
42 case 'q':
43 qflag = 1;
44 break;
45 default:
46 usage();
47 }
48 }
49 argc -= optind;
50 argv += optind;
51 if (argc != 1)
52 usage();
53
54 buf = realpath(argv[0], NULL);
55 if (buf == NULL) {
56 if (qflag)
57 return (1);
58 err(1, "%s", argv[0]);
59 }
60
61 printf("%s\n", buf);
62 return (0);
63 }
64