wcsstr - locate a substring in a wide-character string
wchar_t *wcsstr(const wchar_t *haystack, const wchar_t *needle);
The wcsstr() function is the wide-character equivalent of the
strstr(3) function. It searches for the first occurrence of the
wide-character string needle (without its terminating null wide
character (L'\0')) as a substring in the wide-character string
The wcsstr() function returns a pointer to the first occurrence of
needle in haystack. It returns NULL if needle does not
occur as a substring in haystack.
Note the special case: If needle is the empty
wide-character string, the return value is always haystack
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, C99.
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