strncmp.c

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    1 /*      $NetBSD: strncmp.c,v 1.10 2003/08/07 16:32:11 agc Exp $ */
    2 
    3 /*
    4  * Copyright (c) 1989, 1993
    5  *      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 #if defined(LIBC_SCCS) && !defined(lint)
   34 #if 0
   35 static char sccsid[] = "@(#)strncmp.c   8.1 (Berkeley) 6/4/93";
   36 #else
   37 __RCSID("$NetBSD: strncmp.c,v 1.10 2003/08/07 16:32:11 agc Exp $");
   38 #endif
   39 #endif /* LIBC_SCCS and not lint */
   40 
   41 #if !defined(_KERNEL) && !defined(_STANDALONE)
   42 #include <string.h>
   43 #else
   44 #include <lib/libkern/libkern.h>
   45 #endif
   46 
   47 int
   48 strncmp(s1, s2, n)
   49         const char *s1, *s2;
   50         size_t n;
   51 {
   52 
   53         if (n == 0)
   54                 return (0);
   55         do {
   56                 if (*s1 != *s2++)
   57                         return (*(const unsigned char *)s1 -
   58                             *(const unsigned char *)--s2);
   59                 if (*s1++ == 0)
   60                         break;
   61         } while (--n != 0);
   62         return (0);
   63 }

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

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