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`wmemchr'--find a wide-character in memory

     #include <wchar.h>
     wchar_t	*wmemchr(const wchar_t *S, wchar_t C, size_t N);
The `wmemchr' function locates the first occurrence of C in the initial
N wide-characters of the object pointed to be S. This function is not
affected by locale and all wchar_t values are treated identically.  The
null wide-character and wchar_t values not corresponding to valid
characters are not treated specially.
   If N is zero, S must be a valid pointer and the function behaves as
if no valid occurrence of C is found.
The `wmemchr' function returns a pointer to the located wide-character,
or a null pointer if the wide-character does not occur in the object.
`wmemchr' is ISO/IEC 9899/AMD1:1995 (ISO C).  No supporting OS
subroutines are required.