1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /* 33 * NAME 34 * casncmp - compare strings ignoring case 35 * 36 * SYNOPSIS 37 * int casncmp(char *s1, char *s2, ssize_t n) 38 * 39 * DESCRIPTION 40 * Compare two strings ignoring case differences. 41 * Stop after n bytes or the trailing NUL. 42 */ 43 44 #include "libmail.h" 45 #include <ctype.h> 46 #include <sys/types.h> 47 48 int 49 casncmp(char *s1, char *s2, ssize_t n) 50 { 51 if (s1 == s2) 52 return (0); 53 while ((--n >= 0) && (tolower(*s1) == tolower(*s2))) { 54 s2++; 55 if (*s1++ == '\0') 56 return (0); 57 } 58 return ((n < 0)? 0: (*s1 - *s2)); 59 } 60