ppc/gen/strcmp.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /* Copyright (c) 1992, 1997 NeXT Software, Inc.  All rights reserved.
  26  *
  27  *      File:   libc/gen/ppc/strcmp.c
  28  *
  29  *      This file contains machine dependent code for string comparison
  30  *      on NeXT 88K-based products.
  31  *
  32  * HISTORY
  33  *  24-Jan-1997 Umesh Vaishampayan (umeshv@NeXT.com)
  34  *      Ported to PPC.
  35  * 24-Nov-92  Derek B Clegg (dclegg@next.com)
  36  *      Created.
  37  */
  38 #import <string.h>
  39
  40 /* This routine should be optimized. */
  41
  42 /* ANSI sez:
  43  *   The `strcmp' function compares the string pointed to by `s1' to the
  44  *   string pointed to by `s2'.
  45  *   The `strcmp' function returns an integer greater than, equal to, or less
  46  *   than zero, according as the string pointed to by `s1' is greater than,
  47  *   equal to, or less than the string pointed to by `s2'.  [4.11.4.2]
  48  */
  49 int
  50 strcmp(const char *s1, const char *s2)
  51 {
  52     for ( ; *s1 == *s2; s1++, s2++)
  53         if (*s1 == '\0')
  54             return 0;
  55     return ((*(unsigned char *)s1 < *(unsigned char *)s2) ? -1 : +1);
  56 }