1 /* $NetBSD: basename.c,v 1.11 2003/08/07 11:13:10 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[] = "@(#)basename.c 8.4 (Berkeley) 5/4/95"; 41 #endif 42 __RCSID("$NetBSD: basename.c,v 1.11 2003/08/07 11:13:10 agc 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 int main __P((int, char **)); 52 void usage __P((void)); 53 54 int 55 main(argc, argv) 56 int argc; 57 char **argv; 58 { 59 char *p; 60 int ch; 61 62 setlocale(LC_ALL, ""); 63 64 while ((ch = getopt(argc, argv, "")) != -1) 65 switch(ch) { 66 case '?': 67 default: 68 usage(); 69 } 70 argc -= optind; 71 argv += optind; 72 73 if (argc != 1 && argc != 2) 74 usage(); 75 76 /* 77 * (1) If string is // it is implementation defined whether steps (2) 78 * through (5) are skipped or processed. 79 * 80 * (2) If string consists entirely of slash characters, string shall 81 * be set to a single slash character. In this case, skip steps 82 * (3) through (5). 83 */ 84 for (p = *argv;; ++p) { 85 if (!*p) { 86 if (p > *argv) 87 (void)printf("/\n"); 88 else 89 (void)printf("\n"); 90 exit(0); 91 } 92 if (*p != '/') 93 break; 94 } 95 96 /* 97 * (3) If there are any trailing slash characters in string, they 98 * shall be removed. 99 */ 100 for (; *p; ++p) 101 continue; 102 while (*--p == '/') 103 continue; 104 *++p = '\0'; 105 106 /* 107 * (4) If there are any slash characters remaining in string, the 108 * prefix of string up to an including the last slash character 109 * in string shall be removed. 110 */ 111 while (--p >= *argv) 112 if (*p == '/') 113 break; 114 ++p; 115 116 /* 117 * (5) If the suffix operand is present, is not identical to the 118 * characters remaining in string, and is identical to a suffix 119 * of the characters remaining in string, the suffix suffix 120 * shall be removed from string. 121 */ 122 if (*++argv) { 123 int suffixlen, stringlen, off; 124 125 suffixlen = strlen(*argv); 126 stringlen = strlen(p); 127 128 if (suffixlen < stringlen) { 129 off = stringlen - suffixlen; 130 if (!strcmp(p + off, *argv)) 131 p[off] = '\0'; 132 } 133 } 134 (void)printf("%s\n", p); 135 exit(0); 136 } 137 138 void 139 usage() 140 { 141 142 (void)fprintf(stderr, "usage: basename string [suffix]\n"); 143 exit(1); 144 } 145