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wchar_t *wmemchr(const wchar_t *s, wchar_t c, size_t n);
The wmemchr() function is the wide-character equivalent of the mem-
chr(3) function. It searches the n wide characters starting at s for
the first occurrence of the wide character c.
The wmemchr() function returns a pointer to the first occurrence of c
among the n wide characters starting at s, or NULL if c does not occur
Multithreading (see pthreads(7))
The wmemchr() function is thread-safe.
GNU 2013-11-05 WMEMCHR(3)