wcscmp routine to compare two wchar_t strings for equal less or greate

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/***
*wcscmp.c - routine to compare two wchar_t strings (for equal, less, or greater)
*
* Copyright (c) Microsoft Corporation. All rights reserved.
*
*Purpose:
* Compares two wide-character strings, determining their lexical order.
*
*******************************************************************************/
#include <cruntime.h>
#include <string.h>
#if defined (_M_IA64) || defined (_M_AMD64) || defined (_M_IX86)
#pragma warning(disable:4163)
#pragma function(wcscmp)
#endif /* defined (_M_IA64) || defined (_M_AMD64) || defined (_M_IX86) */
/***
*wcscmp - compare two wchar_t strings,
* returning less than, equal to, or greater than
*
*Purpose:
* wcscmp compares two wide-character strings and returns an integer
* to indicate whether the first is less than the second, the two are
* equal, or whether the first is greater than the second.
*
* Comparison is done wchar_t by wchar_t on an UNSIGNED basis, which is to
* say that Null wchar_t(0) is less than any other character.
*
*Entry:
* const wchar_t * src - string for left-hand side of comparison
* const wchar_t * dst - string for right-hand side of comparison
*
*Exit:
* returns -1 if src < dst
* returns 0 if src == dst
* returns +1 if src > dst
*
*Exceptions:
*
*******************************************************************************/
int __cdecl wcscmp (
const wchar_t * src,
const wchar_t * dst
)
{
int ret = 0 ;
while( ! (ret = (int)(*src - *dst)) && *dst)
++src, ++dst;
if ( ret < 0 )
ret = -1 ;
else if ( ret > 0 )
ret = 1 ;
return( ret );
}