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 (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. 24 */ 25 26 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 27 /* All Rights Reserved */ 28 29 /* 30 * Portions of this source code were derived from Berkeley 4.3 BSD 31 * under license from the Regents of the University of California. 32 */ 33 34 #include "lint.h" 35 #include <sys/types.h> 36 #include <strings.h> 37 38 /* 39 * This array is designed for mapping upper and lower case letter 40 * together for a case independent comparison. The mappings are 41 * based upon ascii character sequences. 42 */ 43 44 extern const char strcase_charmap[]; 45 46 int 47 ascii_strncasecmp(const char *s1, const char *s2, size_t n) 48 { 49 const unsigned char *cm = (const unsigned char *)strcase_charmap; 50 const unsigned char *us1 = (const unsigned char *)s1; 51 const unsigned char *us2 = (const unsigned char *)s2; 52 53 while (n != 0 && cm[*us1] == cm[*us2++]) { 54 if (*us1++ == '\0') 55 return (0); 56 n--; 57 } 58 return (n == 0 ? 0 : cm[*us1] - cm[*(us2 - 1)]); 59 } 60