1 /* $OpenBSD: basename.c,v 1.3 1997/08/17 21:25:01 millert Exp $ */ 2 /* $NetBSD: basename.c,v 1.9 1995/09/02 05:29:46 jtc Exp $ */ 3 4 /*- 5 * Copyright (c) 1991, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 static char copyright[] = 39 "@(#) Copyright (c) 1991, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)basename.c 8.4 (Berkeley) 5/4/95"; 46 #endif 47 static char rcsid[] = "$OpenBSD: basename.c,v 1.3 1997/08/17 21:25:01 millert Exp $"; 48 #endif /* not lint */ 49 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <locale.h> 54 #include <unistd.h> 55 56 void usage __P((void)); 57 58 int 59 main(argc, argv) 60 int argc; 61 char **argv; 62 { 63 char *p; 64 65 setlocale(LC_ALL, ""); 66 67 if (argc != 2 && argc != 3) 68 usage(); 69 argc--; 70 argv++; 71 72 /* 73 * (1) If string is // it is implementation defined whether steps (2) 74 * through (5) are skipped or processed. 75 * 76 * (2) If string consists entirely of slash characters, string shall 77 * be set to a single slash character. In this case, skip steps 78 * (3) through (5). 79 */ 80 for (p = *argv;; ++p) { 81 if (!*p) { 82 if (p > *argv) 83 (void)putchar('/'); 84 (void)putchar('\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 continue; 97 while (*--p == '/') 98 continue; 99 *++p = '\0'; 100 101 /* 102 * (4) If there are any slash characters remaining in string, the 103 * prefix of string up to an including the last slash character 104 * in string shall be removed. 105 */ 106 while (--p >= *argv) 107 if (*p == '/') 108 break; 109 ++p; 110 111 /* 112 * (5) If the suffix operand is present, is not identical to the 113 * characters remaining in string, and is identical to a suffix 114 * of the characters remaining in string, the suffix suffix 115 * shall be removed from string. 116 */ 117 if (*++argv) { 118 int suffixlen, stringlen, off; 119 120 suffixlen = strlen(*argv); 121 stringlen = strlen(p); 122 123 if (suffixlen < stringlen) { 124 off = stringlen - suffixlen; 125 if (!strcmp(p + off, *argv)) 126 p[off] = '\0'; 127 } 128 } 129 (void)puts(p); 130 exit(0); 131 } 132 133 void 134 usage() 135 { 136 137 (void)fprintf(stderr, "usage: basename string [suffix]\n"); 138 exit(1); 139 } 140