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`wcschr'--wide-character string scanning operation

     #include <wchar.h>
     wchar_t *wcschr(const wchar_t *S, wchar_t C);
The `wcschr' function locates the first occurrence of C in the
wide-character string pointed to by S. The value of C must be a
character representable as a type wchar_t and must be a wide-character
code corresponding to a valid character in the current locale.  The
terminating null wide-character string.
Upon completion, `wcschr' returns a pointer to the wide-character code,
or a null pointer if the wide-character code is not found.
`wcschr' is ISO/IEC 9899/AMD1:1995 (ISO C).  No supporting OS
subroutines are required.