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 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)strcasecmp.c 8.1 (Berkeley) 6/4/93"; 36 #endif /* LIBC_SCCS and not lint */ 37 #ifndef lint 38 static const char rcsid[] = 39 "$FreeBSD: src/lib/libc/string/strcasecmp.c,v 1.2.8.1 2001/07/09 23:30:03 obrien Exp $"; 40 #endif 41 42 #include <sys/cdefs.h> 43 #include <string.h> 44 #include <ctype.h> 45 46 typedef unsigned char u_char; 47 48 int 49 strcasecmp(s1, s2) 50 const char *s1, *s2; 51 { 52 register const u_char 53 *us1 = (const u_char *)s1, 54 *us2 = (const u_char *)s2; 55 56 while (tolower(*us1) == tolower(*us2++)) 57 if (*us1++ == '\0') 58 return (0); 59 return (tolower(*us1) - tolower(*--us2)); 60 } 61 62 int 63 strncasecmp(s1, s2, n) 64 const char *s1, *s2; 65 register size_t n; 66 { 67 if (n != 0) { 68 register const u_char 69 *us1 = (const u_char *)s1, 70 *us2 = (const u_char *)s2; 71 72 do { 73 if (tolower(*us1) != tolower(*us2++)) 74 return (tolower(*us1) - tolower(*--us2)); 75 if (*us1++ == '\0') 76 break; 77 } while (--n != 0); 78 } 79 return (0); 80 } 81