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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 23 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 24 /* All Rights Reserved */ 25 26 /* 27 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 31 #pragma ident "%Z%%M% %I% %E% SMI" 32 /*LINTLIBRARY*/ 33 34 /* 35 * NAME 36 * casncmp - compare strings ignoring case 37 * 38 * SYNOPSIS 39 * int casncmp(char *s1, char *s2, ssize_t n) 40 * 41 * DESCRIPTION 42 * Compare two strings ignoring case differences. 43 * Stop after n bytes or the trailing NUL. 44 */ 45 46 #include "c_synonyms.h" 47 #include "libmail.h" 48 #include <ctype.h> 49 #include <sys/types.h> 50 51 int 52 casncmp(char *s1, char *s2, ssize_t n) 53 { 54 if (s1 == s2) 55 return (0); 56 while ((--n >= 0) && (tolower(*s1) == tolower(*s2))) { 57 s2++; 58 if (*s1++ == '\0') 59 return (0); 60 } 61 return ((n < 0)? 0: (*s1 - *s2)); 62 } 63