1 /* 2 * Copyright (c) 1987, 1993 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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)strcasecmp.c 8.1 (Berkeley) 6/4/93 30 * $FreeBSD: src/lib/libc/string/strcasecmp.c,v 1.7 2007/01/09 00:28:12 imp Exp $ 31 * $DragonFly: src/lib/libc/string/strcasecmp.c,v 1.8 2005/04/29 16:12:52 dillon Exp $ 32 */ 33 34 #include <sys/types.h> 35 #include <strings.h> 36 #include <ctype.h> 37 38 int 39 strcasecmp(const char *s1, const char *s2) 40 { 41 while (tolower((u_char)*s1) == tolower((u_char)*s2++)) 42 if (*s1++ == '\0') 43 return (0); 44 return (tolower((u_char)*s1) - tolower((u_char)*--s2)); 45 } 46 47 int 48 strncasecmp(const char *s1, const char *s2, size_t n) 49 { 50 if (n != 0) { 51 do { 52 if (tolower((u_char)*s1) != tolower((u_char)*s2++)) 53 return (tolower((u_char)*s1) - tolower((u_char)*--s2)); 54 if (*s1++ == '\0') 55 break; 56 } while (--n != 0); 57 } 58 return (0); 59 } 60