libc.info: wcsrchr

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`wcsrchr'--wide-character string scanning operation

*Synopsis*
     #include <wchar.h>
     wchar_t *wcsrchr(const wchar_t *S, wchar_t C);
   *Description*
The `wcsrchr' function locates the last 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 code is considered to be part of the
wide-character string.
*Returns*
Upon successful completion, `wcsrchr' returns a pointer to the
wide-character code or a null pointer if C does not occur in the
wide-character string.
*Portability*
`wcsrchr' is ISO/IEC 9899/AMD1:1995 (ISO C).  No supporting OS
subroutines are required.