1 /*- 2 * Copyright (c) 1991, 1993, 1994 3 * The Regents of the University of California. 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 static char copyright[] = 36 "@(#) Copyright (c) 1991, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)dirname.c 8.3 (Berkeley) 4/2/94"; 42 #endif /* not lint */ 43 44 #include <stdio.h> 45 #include <stdlib.h> 46 47 void usage __P((void)); 48 49 int 50 main(argc, argv) 51 int argc; 52 char **argv; 53 { 54 char *p; 55 int ch; 56 57 while ((ch = getopt(argc, argv, "")) != EOF) 58 switch(ch) { 59 case '?': 60 default: 61 usage(); 62 } 63 argc -= optind; 64 argv += optind; 65 66 if (argc != 1) 67 usage(); 68 69 /* 70 * (1) If string is //, skip steps (2) through (5). 71 * (2) If string consists entirely of slash characters, string 72 * shall be set to a single slash character. In this case, 73 * skip steps (3) through (8). 74 */ 75 for (p = *argv;; ++p) { 76 if (!*p) { 77 if (p > *argv) 78 (void)printf("/\n"); 79 else 80 (void)printf(".\n"); 81 exit(0); 82 } 83 if (*p != '/') 84 break; 85 } 86 87 /* 88 * (3) If there are any trailing slash characters in string, they 89 * shall be removed. 90 */ 91 for (; *p; ++p); 92 while (*--p == '/') 93 continue; 94 *++p = '\0'; 95 96 /* 97 * (4) If there are no slash characters remaining in string, 98 * string shall be set to a single period character. In this 99 * case skip steps (5) through (8). 100 * 101 * (5) If there are any trailing nonslash characters in string, 102 * they shall be removed. 103 */ 104 while (--p >= *argv) 105 if (*p == '/') 106 break; 107 ++p; 108 if (p == *argv) { 109 (void)printf(".\n"); 110 exit(0); 111 } 112 113 /* 114 * (6) If the remaining string is //, it is implementation defined 115 * whether steps (7) and (8) are skipped or processed. 116 * 117 * This case has already been handled, as part of steps (1) and (2). 118 */ 119 120 /* 121 * (7) If there are any trailing slash characters in string, they 122 * shall be removed. 123 */ 124 while (--p >= *argv) 125 if (*p != '/') 126 break; 127 ++p; 128 129 /* 130 * (8) If the remaining string is empty, string shall be set to 131 * a single slash character. 132 */ 133 *p = '\0'; 134 (void)printf("%s\n", p == *argv ? "/" : *argv); 135 exit(0); 136 } 137 138 void 139 usage() 140 { 141 142 (void)fprintf(stderr, "usage: dirname path\n"); 143 exit(1); 144 } 145