1 /* $NetBSD: basename.c,v 1.12 2005/02/17 16:57:27 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[] = "@(#)basename.c 8.4 (Berkeley) 5/4/95"; 41 #endif 42 __RCSID("$NetBSD: basename.c,v 1.12 2005/02/17 16:57:27 xtraeme Exp $"); 43 #endif /* not lint */ 44 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <locale.h> 49 #include <unistd.h> 50 51 void usage(void); 52 53 int 54 main(int argc, char **argv) 55 { 56 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 && argc != 2) 71 usage(); 72 73 /* 74 * (1) If string is // it is implementation defined whether steps (2) 75 * through (5) are skipped or processed. 76 * 77 * (2) If string consists entirely of slash characters, string shall 78 * be set to a single slash character. In this case, skip steps 79 * (3) through (5). 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 continue; 99 while (*--p == '/') 100 continue; 101 *++p = '\0'; 102 103 /* 104 * (4) If there are any slash characters remaining in string, the 105 * prefix of string up to an including the last slash character 106 * in string shall be removed. 107 */ 108 while (--p >= *argv) 109 if (*p == '/') 110 break; 111 ++p; 112 113 /* 114 * (5) If the suffix operand is present, is not identical to the 115 * characters remaining in string, and is identical to a suffix 116 * of the characters remaining in string, the suffix suffix 117 * shall be removed from string. 118 */ 119 if (*++argv) { 120 int suffixlen, stringlen, off; 121 122 suffixlen = strlen(*argv); 123 stringlen = strlen(p); 124 125 if (suffixlen < stringlen) { 126 off = stringlen - suffixlen; 127 if (!strcmp(p + off, *argv)) 128 p[off] = '\0'; 129 } 130 } 131 (void)printf("%s\n", p); 132 exit(0); 133 } 134 135 void 136 usage(void) 137 { 138 139 (void)fprintf(stderr, "usage: basename string [suffix]\n"); 140 exit(1); 141 } 142