1 /* $NetBSD: dirname.c,v 1.9 2005/02/17 17:41:34 xtraeme Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\n\ 35 The Regents of the University of California. All rights reserved.\n"); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)dirname.c 8.4 (Berkeley) 5/4/95"; 41 #endif 42 __RCSID("$NetBSD: dirname.c,v 1.9 2005/02/17 17:41:34 xtraeme Exp $"); 43 #endif /* not lint */ 44 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <locale.h> 48 #include <unistd.h> 49 50 static void usage(void); 51 52 int 53 main(int argc, char **argv) 54 { 55 register char *p; 56 int ch; 57 58 setlocale(LC_ALL, ""); 59 60 while ((ch = getopt(argc, argv, "")) != -1) 61 switch(ch) { 62 case '?': 63 default: 64 usage(); 65 } 66 argc -= optind; 67 argv += optind; 68 69 if (argc != 1) 70 usage(); 71 72 /* 73 * (1) If string is //, skip steps (2) through (5). 74 * (2) If string consists entirely of slash characters, string 75 * shall be set to a single slash character. In this case, 76 * skip steps (3) through (8). 77 */ 78 for (p = *argv;; ++p) { 79 if (!*p) { 80 if (p > *argv) 81 (void)printf("/\n"); 82 else 83 (void)printf(".\n"); 84 exit(0); 85 } 86 if (*p != '/') 87 break; 88 } 89 90 /* 91 * (3) If there are any trailing slash characters in string, they 92 * shall be removed. 93 */ 94 for (; *p; ++p); 95 while (*--p == '/') 96 continue; 97 *++p = '\0'; 98 99 /* 100 * (4) If there are no slash characters remaining in string, 101 * string shall be set to a single period character. In this 102 * case skip steps (5) through (8). 103 * 104 * (5) If there are any trailing nonslash characters in string, 105 * they shall be removed. 106 */ 107 while (--p >= *argv) 108 if (*p == '/') 109 break; 110 ++p; 111 if (p == *argv) { 112 (void)printf(".\n"); 113 exit(0); 114 } 115 116 /* 117 * (6) If the remaining string is //, it is implementation defined 118 * whether steps (7) and (8) are skipped or processed. 119 * 120 * This case has already been handled, as part of steps (1) and (2). 121 */ 122 123 /* 124 * (7) If there are any trailing slash characters in string, they 125 * shall be removed. 126 */ 127 while (--p >= *argv) 128 if (*p != '/') 129 break; 130 ++p; 131 132 /* 133 * (8) If the remaining string is empty, string shall be set to 134 * a single slash character. 135 */ 136 *p = '\0'; 137 (void)printf("%s\n", p == *argv ? "/" : *argv); 138 exit(0); 139 } 140 141 static void 142 usage(void) 143 { 144 145 (void)fprintf(stderr, "usage: dirname path\n"); 146 exit(1); 147 } 148 149