strncasecmp.c

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    1 /*
    2  * Copyright (c) 1994 Christian E. Hopps
    3  * 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 Christian E. Hopps.
   16  * 4. The name of the author may not be used to endorse or promote products
   17  *    derived from this software without specific prior written permission
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 #if defined(LIBC_SCCS) && !defined(lint)
   31 static char *rcsid = "$NetBSD: strncasecmp.c,v 1.5 1998/03/27 01:30:10 cgd Exp $";
   32 #endif /* LIBC_SCCS and not lint */
   33 
   34 #if defined(_KERNEL) || defined(_STANDALONE)
   35 #include <lib/libkern/libkern.h>
   36 #else
   37 #include <string.h>
   38 #endif
   39 
   40 int
   41 strncasecmp(s1, s2, n)
   42         const char *s1;
   43         const char *s2;
   44         size_t n;
   45 {
   46         if (n == 0)
   47                 return 0;
   48 
   49         do {
   50                 unsigned char c1 = (unsigned char) *s1++;
   51                 unsigned char c2 = (unsigned char) *s2++;
   52 
   53                 if (c1 != c2) {
   54                         if (c1 >= 'A' && c1 <= 'Z' && 
   55                             c2 >= 'a' && c2 <= 'z')
   56                                 c1 += 'a' - 'A';
   57                         else if (c1 >= 'a' && c1 <= 'z' && 
   58                                  c2 >= 'A' && c2 <= 'Z')
   59                                 c2 += 'a' - 'A';
   60                         if (c1 != c2)
   61                                 return c1 - c2;
   62                 }
   63                 if (c1 == 0)
   64                         break;
   65         } while (--n != 0);
   66 
   67         return 0;
   68 }

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FreeBSD/Linux Kernel Cross Reference sys/lib/libkern/strncasecmp.c

FreeBSD/Linux Kernel Cross Reference
sys/lib/libkern/strncasecmp.c