Home | History | Annotate | Download | only in String 
      1 /** @file
      2   strncasecmp implementation
      3 
      4   Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
      5   This program and the accompanying materials are licensed and made available under
      6   the terms and conditions of the BSD License that accompanies this distribution.
      7   The full text of the license may be found at
      8   http://opensource.org/licenses/bsd-license.php.
      9 
     10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
     11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
     12 
     13  * Copyright (c) 1987, 1993
     14  *  The Regents of the University of California.  All rights reserved.
     15  *
     16  * Redistribution and use in source and binary forms, with or without
     17  * modification, are permitted provided that the following conditions
     18  * are met:
     19  * 1. Redistributions of source code must retain the above copyright
     20  *    notice, this list of conditions and the following disclaimer.
     21  * 2. Redistributions in binary form must reproduce the above copyright
     22  *    notice, this list of conditions and the following disclaimer in the
     23  *    documentation and/or other materials provided with the distribution.
     24  * 3. Neither the name of the University nor the names of its contributors
     25  *    may be used to endorse or promote products derived from this software
     26  *    without specific prior written permission.
     27  *
     28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38  * SUCH DAMAGE.
     39 
     40   $NetBSD: strncasecmp.c,v 1.2 2007/06/04 18:19:27 christos Exp $
     41   strcasecmp.c  8.1 (Berkeley) 6/4/93
     42 **/
     43 #include <LibConfig.h>
     44 #include <sys/cdefs.h>
     45 
     46 #if !defined(_KERNEL) && !defined(_STANDALONE)
     47 #include "namespace.h"
     48 #include <assert.h>
     49 #include <ctype.h>
     50 #include <string.h>
     51 #ifdef __weak_alias
     52 __weak_alias(strcasecmp,_strcasecmp)
     53 __weak_alias(strncasecmp,_strncasecmp)
     54 #endif
     55 #else
     56 #include <lib/libkern/libkern.h>
     57 #include <machine/limits.h>
     58 #endif
     59 
     60 int
     61 strncasecmp(const char *s1, const char *s2, size_t n)
     62 {
     63   int   CompareVal;
     64 
     65   _DIAGASSERT(s1 != NULL);
     66   _DIAGASSERT(s2 != NULL);
     67 
     68   if (n != 0) {
     69     do {
     70       CompareVal = tolower(*s1) - tolower(*s2);
     71       if (CompareVal != 0) {
     72         return (CompareVal);
     73       }
     74       ++s1;
     75       ++s2;
     76       if (*s1 == '\0') {
     77         break;
     78       }
     79     } while (--n != 0);
     80   }
     81   return (0);
     82 }
     83