strcasecmp.c

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    1 /*      $NetBSD: strcasecmp.c,v 1.1 2000/11/01 19:37:18 thorpej Exp $   */
    2 
    3 /*
    4  * Copyright (c) 1994 Christian E. Hopps
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *      This product includes software developed by Christian E. Hopps.
   18  * 4. The name of the author may not be used to endorse or promote products
   19  *    derived from this software without specific prior written permission
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #if defined(LIBC_SCCS) && !defined(lint)
   34 static char *rcsid = "$NetBSD: strcasecmp.c,v 1.1 2000/11/01 19:37:18 thorpej Exp $";
   35 #endif /* LIBC_SCCS and not lint */
   36 
   37 #if defined(_KERNEL) || defined(_STANDALONE)
   38 #include <lib/libkern/libkern.h>
   39 #else
   40 #include <string.h>
   41 #endif
   42 
   43 int
   44 strcasecmp(s1, s2)
   45         const char *s1;
   46         const char *s2;
   47 {
   48         unsigned char c1, c2;
   49 
   50         do {
   51                 c1 = (unsigned char) *s1++;
   52                 c2 = (unsigned char) *s2++;
   53 
   54                 if (c1 != c2) {
   55                         if (c1 >= 'A' && c1 <= 'Z' && 
   56                             c2 >= 'a' && c2 <= 'z')
   57                                 c1 += 'a' - 'A';
   58                         else if (c1 >= 'a' && c1 <= 'z' && 
   59                                  c2 >= 'A' && c2 <= 'Z')
   60                                 c2 += 'a' - 'A';
   61                         if (c1 != c2)
   62                                 return c1 - c2;
   63                 }
   64         } while (c1 != 0);
   65 
   66         return 0;
   67 }

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

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