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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)strcasecmp.c 8.1 (Berkeley) 6/4/93 34 * $FreeBSD: src/lib/libc/string/strcasecmp.c,v 1.2.8.1 2001/07/09 23:30:03 obrien Exp $ 35 * $DragonFly: src/lib/libc/string/strcasecmp.c,v 1.3 2004/10/25 19:38:02 drhodus Exp $ 36 */ 37 38 #include <sys/cdefs.h> 39 #include <string.h> 40 #include <ctype.h> 41 42 typedef unsigned char u_char; 43 44 int 45 strcasecmp(s1, s2) 46 const char *s1, *s2; 47 { 48 const u_char 49 *us1 = (const u_char *)s1, 50 *us2 = (const u_char *)s2; 51 52 while (tolower(*us1) == tolower(*us2++)) 53 if (*us1++ == '\0') 54 return (0); 55 return (tolower(*us1) - tolower(*--us2)); 56 } 57 58 int 59 strncasecmp(s1, s2, n) 60 const char *s1, *s2; 61 size_t n; 62 { 63 if (n != 0) { 64 const u_char 65 *us1 = (const u_char *)s1, 66 *us2 = (const u_char *)s2; 67 68 do { 69 if (tolower(*us1) != tolower(*us2++)) 70 return (tolower(*us1) - tolower(*--us2)); 71 if (*us1++ == '\0') 72 break; 73 } while (--n != 0); 74 } 75 return (0); 76 } 77