wcsrchr - search a wide character in a wide-character string
wchar_t *wcsrchr(const wchar_t *wcs, wchar_t wc);
The wcsrchr() function is the wide-character equivalent of the
strrchr(3) function. It searches the last occurrence of wc in
the wide-character string pointed to by wcs.
The wcsrchr() function returns a pointer to the last occurrence of
wc in the wide-character string pointed to by wcs, or NULL if
wc does not occur in the string.
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, C99.
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