1 /* $NetBSD: basename.c,v 1.10 1997/10/18 12:18:20 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[] = "@(#)basename.c 8.4 (Berkeley) 5/4/95"; 45 #endif 46 __RCSID("$NetBSD: basename.c,v 1.10 1997/10/18 12:18:20 lukem Exp $"); 47 #endif /* not lint */ 48 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <locale.h> 53 #include <unistd.h> 54 55 int main __P((int, char **)); 56 void usage __P((void)); 57 58 int 59 main(argc, argv) 60 int argc; 61 char **argv; 62 { 63 char *p; 64 int ch; 65 66 setlocale(LC_ALL, ""); 67 68 while ((ch = getopt(argc, argv, "")) != -1) 69 switch(ch) { 70 case '?': 71 default: 72 usage(); 73 } 74 argc -= optind; 75 argv += optind; 76 77 if (argc != 1 && argc != 2) 78 usage(); 79 80 /* 81 * (1) If string is // it is implementation defined whether steps (2) 82 * through (5) are skipped or processed. 83 * 84 * (2) If string consists entirely of slash characters, string shall 85 * be set to a single slash character. In this case, skip steps 86 * (3) through (5). 87 */ 88 for (p = *argv;; ++p) { 89 if (!*p) { 90 if (p > *argv) 91 (void)printf("/\n"); 92 else 93 (void)printf("\n"); 94 exit(0); 95 } 96 if (*p != '/') 97 break; 98 } 99 100 /* 101 * (3) If there are any trailing slash characters in string, they 102 * shall be removed. 103 */ 104 for (; *p; ++p) 105 continue; 106 while (*--p == '/') 107 continue; 108 *++p = '\0'; 109 110 /* 111 * (4) If there are any slash characters remaining in string, the 112 * prefix of string up to an including the last slash character 113 * in string shall be removed. 114 */ 115 while (--p >= *argv) 116 if (*p == '/') 117 break; 118 ++p; 119 120 /* 121 * (5) If the suffix operand is present, is not identical to the 122 * characters remaining in string, and is identical to a suffix 123 * of the characters remaining in string, the suffix suffix 124 * shall be removed from string. 125 */ 126 if (*++argv) { 127 int suffixlen, stringlen, off; 128 129 suffixlen = strlen(*argv); 130 stringlen = strlen(p); 131 132 if (suffixlen < stringlen) { 133 off = stringlen - suffixlen; 134 if (!strcmp(p + off, *argv)) 135 p[off] = '\0'; 136 } 137 } 138 (void)printf("%s\n", p); 139 exit(0); 140 } 141 142 void 143 usage() 144 { 145 146 (void)fprintf(stderr, "usage: basename string [suffix]\n"); 147 exit(1); 148 } 149