1 /* $NetBSD: dirname.c,v 1.8 2003/08/07 11:13:34 agc 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 1.8 2003/08/07 11:13:34 agc Exp $"); 43 #endif /* not lint */ 44 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <locale.h> 48 #include <unistd.h> 49 50 int main __P((int, char **)); 51 static void usage __P((void)); 52 53 int 54 main(argc, argv) 55 int argc; 56 char **argv; 57 { 58 register char *p; 59 int ch; 60 61 setlocale(LC_ALL, ""); 62 63 while ((ch = getopt(argc, argv, "")) != -1) 64 switch(ch) { 65 case '?': 66 default: 67 usage(); 68 } 69 argc -= optind; 70 argv += optind; 71 72 if (argc != 1) 73 usage(); 74 75 /* 76 * (1) If string is //, skip steps (2) through (5). 77 * (2) If string consists entirely of slash characters, string 78 * shall be set to a single slash character. In this case, 79 * skip steps (3) through (8). 80 */ 81 for (p = *argv;; ++p) { 82 if (!*p) { 83 if (p > *argv) 84 (void)printf("/\n"); 85 else 86 (void)printf(".\n"); 87 exit(0); 88 } 89 if (*p != '/') 90 break; 91 } 92 93 /* 94 * (3) If there are any trailing slash characters in string, they 95 * shall be removed. 96 */ 97 for (; *p; ++p); 98 while (*--p == '/') 99 continue; 100 *++p = '\0'; 101 102 /* 103 * (4) If there are no slash characters remaining in string, 104 * string shall be set to a single period character. In this 105 * case skip steps (5) through (8). 106 * 107 * (5) If there are any trailing nonslash characters in string, 108 * they shall be removed. 109 */ 110 while (--p >= *argv) 111 if (*p == '/') 112 break; 113 ++p; 114 if (p == *argv) { 115 (void)printf(".\n"); 116 exit(0); 117 } 118 119 /* 120 * (6) If the remaining string is //, it is implementation defined 121 * whether steps (7) and (8) are skipped or processed. 122 * 123 * This case has already been handled, as part of steps (1) and (2). 124 */ 125 126 /* 127 * (7) If there are any trailing slash characters in string, they 128 * shall be removed. 129 */ 130 while (--p >= *argv) 131 if (*p != '/') 132 break; 133 ++p; 134 135 /* 136 * (8) If the remaining string is empty, string shall be set to 137 * a single slash character. 138 */ 139 *p = '\0'; 140 (void)printf("%s\n", p == *argv ? "/" : *argv); 141 exit(0); 142 } 143 144 static void 145 usage() 146 { 147 148 (void)fprintf(stderr, "usage: dirname path\n"); 149 exit(1); 150 } 151 152