1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 char copyright[] = 36 "@(#) Copyright (c) 1991 The Regents of the University of California.\n\ 37 All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /*static char sccsid[] = "from: @(#)dirname.c 5.6 (Berkeley) 3/9/91";*/ 42 static char rcsid[] = "$Id: dirname.c,v 1.4 1993/10/01 22:23:58 jtc Exp $"; 43 #endif /* not lint */ 44 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <locale.h> 48 49 static void usage __P((void)); 50 51 int 52 main(argc, argv) 53 int argc; 54 char **argv; 55 { 56 register char *p; 57 int ch; 58 59 setlocale(LC_ALL, ""); 60 61 while ((ch = getopt(argc, argv, "")) != -1) 62 switch(ch) { 63 case '?': 64 default: 65 usage(); 66 } 67 argc -= optind; 68 argv += optind; 69 70 if (argc != 1) 71 usage(); 72 73 /* 74 * (1) If string is //, skip steps (2) through (5). 75 * (2) If string consists entirely of slash characters, string 76 * shall be set to a single slash character. In this case, 77 * skip steps (3) through (8). 78 */ 79 for (p = *argv;; ++p) { 80 if (!*p) { 81 if (p > *argv) 82 (void)printf("/\n"); 83 else 84 (void)printf(".\n"); 85 exit(0); 86 } 87 if (*p != '/') 88 break; 89 } 90 91 /* 92 * (3) If there are any trailing slash characters in string, they 93 * shall be removed. 94 */ 95 for (; *p; ++p) 96 ; 97 while (*--p == '/') 98 ; 99 *++p = '\0'; 100 101 /* 102 * (4) If there are no slash characters remaining in string, 103 * string shall be set to a single period character. In this 104 * case skip steps (5) through (8). 105 * 106 * (5) If there are any trailing nonslash characters in string, 107 * they shall be removed. 108 */ 109 while (--p >= *argv) 110 if (*p == '/') 111 break; 112 ++p; 113 if (p == *argv) { 114 (void)printf(".\n"); 115 exit(0); 116 } 117 118 /* 119 * (6) If the remaining string is //, it is implementation defined 120 * whether steps (7) and (8) are skipped or processed. 121 * 122 * This case has already been handled, as part of steps (1) and (2). 123 */ 124 125 /* 126 * (7) If there are any trailing slash characters in string, they 127 * shall be removed. 128 */ 129 while (--p >= *argv) 130 if (*p != '/') 131 break; 132 ++p; 133 134 /* 135 * (8) If the remaining string is empty, string shall be set to 136 * a single slash character. 137 */ 138 *p = '\0'; 139 (void)printf("%s\n", p == *argv ? "/" : *argv); 140 exit(0); 141 } 142 143 static void 144 usage() 145 { 146 (void)fprintf(stderr, "usage: dirname path\n"); 147 exit(1); 148 } 149