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 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 57 usage(void) 58 { 59 (void)fprintf(stderr, "usage: %s pathname\n", __progname); 60 exit(1); 61 } 62