1 /* $NetBSD: dirname.c,v 1.7 1997/10/18 13:21:41 lukem 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)dirname.c 8.4 (Berkeley) 5/4/95"; 45 #endif 46 __RCSID("$NetBSD: dirname.c,v 1.7 1997/10/18 13:21:41 lukem Exp $"); 47 #endif /* not lint */ 48 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <locale.h> 52 #include <unistd.h> 53 54 int main __P((int, char **)); 55 static void usage __P((void)); 56 57 int 58 main(argc, argv) 59 int argc; 60 char **argv; 61 { 62 register char *p; 63 int ch; 64 65 setlocale(LC_ALL, ""); 66 67 while ((ch = getopt(argc, argv, "")) != -1) 68 switch(ch) { 69 case '?': 70 default: 71 usage(); 72 } 73 argc -= optind; 74 argv += optind; 75 76 if (argc != 1) 77 usage(); 78 79 /* 80 * (1) If string is //, skip steps (2) through (5). 81 * (2) If string consists entirely of slash characters, string 82 * shall be set to a single slash character. In this case, 83 * skip steps (3) through (8). 84 */ 85 for (p = *argv;; ++p) { 86 if (!*p) { 87 if (p > *argv) 88 (void)printf("/\n"); 89 else 90 (void)printf(".\n"); 91 exit(0); 92 } 93 if (*p != '/') 94 break; 95 } 96 97 /* 98 * (3) If there are any trailing slash characters in string, they 99 * shall be removed. 100 */ 101 for (; *p; ++p); 102 while (*--p == '/') 103 continue; 104 *++p = '\0'; 105 106 /* 107 * (4) If there are no slash characters remaining in string, 108 * string shall be set to a single period character. In this 109 * case skip steps (5) through (8). 110 * 111 * (5) If there are any trailing nonslash characters in string, 112 * they shall be removed. 113 */ 114 while (--p >= *argv) 115 if (*p == '/') 116 break; 117 ++p; 118 if (p == *argv) { 119 (void)printf(".\n"); 120 exit(0); 121 } 122 123 /* 124 * (6) If the remaining string is //, it is implementation defined 125 * whether steps (7) and (8) are skipped or processed. 126 * 127 * This case has already been handled, as part of steps (1) and (2). 128 */ 129 130 /* 131 * (7) If there are any trailing slash characters in string, they 132 * shall be removed. 133 */ 134 while (--p >= *argv) 135 if (*p != '/') 136 break; 137 ++p; 138 139 /* 140 * (8) If the remaining string is empty, string shall be set to 141 * a single slash character. 142 */ 143 *p = '\0'; 144 (void)printf("%s\n", p == *argv ? "/" : *argv); 145 exit(0); 146 } 147 148 static void 149 usage() 150 { 151 152 (void)fprintf(stderr, "usage: dirname path\n"); 153 exit(1); 154 } 155 156