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  1. /*
  2. FUNCTION
  3.         <<wmemcmp>>---compare wide characters in memory
  4.  
  5. ANSI_SYNOPSIS
  6.         #include <wchar.h>
  7.         int wmemcmp(const wchar_t *<[s1]>, const wchar_t *<[s2]>, size_t <[n]>);
  8.  
  9. TRAD_SYNOPSIS
  10.         int wmemcmp(<[s1]>, <[s2]>, <[n]>
  11.         const wchar_t *<[s1]>;
  12.         const wchar_t *<[s2]>;
  13.         size_t <[n]>;
  14.  
  15. DESCRIPTION
  16.         The <<wmemcmp>> function compares the first <[n]> wide characters of the
  17.         object pointed to by <[s1]> to the first <[n]> wide characters of the
  18.         object pointed to by <[s2]>. This function is not affected by locale
  19.         and all wchar_t values are treated identically. The null wide character
  20.         and wchar_t values not corresponding to valid characters are not treated
  21.         specially.
  22.  
  23.         If <[n]> is zero, <[s1]> and <[s2]> must be a valid pointers and the
  24.         function behaves as if the two objects compare equal.
  25.  
  26. RETURNS
  27.         The <<wmemcmp>> function returns an integer greater than, equal to,
  28.         or less than zero, accordingly as the object pointed to by <[s1]> is
  29.         greater than, equal to, or less than the object pointed to by <[s2]>.
  30.  
  31. PORTABILITY
  32. <<wmemcmp>> is ISO/IEC 9899/AMD1:1995 (ISO C).
  33.  
  34. No supporting OS subroutines are required.
  35. */
  36.  
  37. /*      $NetBSD: wmemcmp.c,v 1.1 2000/12/23 23:14:37 itojun Exp $       */
  38.  
  39. /*-
  40.  * Copyright (c)1999 Citrus Project,
  41.  * All rights reserved.
  42.  *
  43.  * Redistribution and use in source and binary forms, with or without
  44.  * modification, are permitted provided that the following conditions
  45.  * are met:
  46.  * 1. Redistributions of source code must retain the above copyright
  47.  *    notice, this list of conditions and the following disclaimer.
  48.  * 2. Redistributions in binary form must reproduce the above copyright
  49.  *    notice, this list of conditions and the following disclaimer in the
  50.  *    documentation and/or other materials provided with the distribution.
  51.  *
  52.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  53.  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  54.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  55.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  56.  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  57.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  58.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  59.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  60.  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  61.  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  62.  * SUCH DAMAGE.
  63.  *
  64.  *      citrus Id: wmemcmp.c,v 1.2 2000/12/20 14:08:31 itojun Exp
  65.  */
  66.  
  67. #include <_ansi.h>
  68. #include <wchar.h>
  69.  
  70. int
  71. _DEFUN (wmemcmp, (s1, s2, n),
  72.         _CONST wchar_t * s1 _AND
  73.         _CONST wchar_t * s2 _AND
  74.         size_t n)
  75. {
  76.   size_t i;
  77.  
  78.   for (i = 0; i < n; i++)
  79.     {
  80.       if (*s1 != *s2)
  81.         {
  82.           /* wchar might be unsigned */
  83.           return *s1 > *s2 ? 1 : -1;
  84.         }
  85.       s1++;
  86.       s2++;
  87.     }
  88.   return 0;
  89. }
  90.