### 6.25 `wcsstr`—find a wide-character substring

Synopsis

    #include <wchar.h>
    wchar_t *wcsstr(const wchar_t *__restrict big,
        const wchar_t *__restrict little);

Description
The `wcsstr` function locates the first occurrence in the wide-character string pointed to by big of the sequence of wide characters (excluding the terminating null wide character) in the wide-character string pointed to by little.

Returns
On successful completion, `wcsstr` returns a pointer to the located wide-character string, or a null pointer if the wide-character string is not found.

If little points to a wide-character string with zero length, the function returns big.

Portability
`wcsstr` is ISO/IEC 9899/AMD1:1995 (ISO C).