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wmemcmp.c
/**
 * This file has no copyright assigned and is placed in the Public Domain.
 * This file is part of the w64 mingw-runtime package.
 * No warranty is given; refer to the file DISCLAIMER.PD within this package.
 */
/*    This source code was extracted from the Q8 package created and placed
    in the PUBLIC DOMAIN by Doug Gwyn <gwyn@arl.mil>
    last edit:    1999/11/05  gwyn@arl.mil

    Implements subclause 7.24 of ISO/IEC 9899:1999 (E).

      It supports an encoding where all char codes are mapped
      to the *same* code values within a wchar_t or wint_t,
      so long as no other wchar_t codes are used by the program.

*/

#define __CRT__NO_INLINE
#include    <wchar.h>

#if 0
int
wmemcmp(s1, s2, n)
      register const wchar_t  *s1;
      register const wchar_t  *s2;
      size_t                        n;
{
      if ( n == 0 || s1 == s2 )
            return 0;         /* even for NULL pointers */

      if ( (s1 != NULL) != (s2 != NULL) )
            return s2 == NULL ? 1 : -1;   /* robust */

      for ( ; n > 0; ++s1, ++s2, --n )
            if ( *s1 != *s2 )
                  return *s1 - *s2;

      return 0;
}
#endif

int __cdecl wmemcmp(const wchar_t *_S1,const wchar_t *_S2,size_t _N)
{
      if (_N == 0 || _S1 == _S2)
            return 0;   /* even for NULL pointers */

      if ((_S1 != NULL) != (_S2 != NULL))
            return _S2 == NULL ? 1 : -1;  /* robust */

      for ( ; 0 < _N; ++_S1, ++_S2, --_N)
            if (*_S1 != *_S2)
                  return (*_S1 < *_S2 ? -1 : +1);

      return 0;
}


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