wcsstr

Defined in header <wchar.h> 
wchar_t *wcsstr( const wchar_t *dest, const wchar_t *src );
 (1) (since C95) 
/*QWchar_t*/ *wcsstr( /*QWchar_t*/ *dest, const wchar_t *src );
 (2) (since C23)
1) Finds the first occurrence of the wide string src in the wide string pointed to by dest. The terminating null characters are not compared.
2) Type-generic function equivalent to (1). Let T be an unqualified wide character object type. If a macro definition of each of these generic functions is suppressed to access an actual function (e.g. if (wcsstr) or a function pointer is used), the actual function declaration (1) becomes visible.

Parameters

dest - pointer to the null-terminated wide string to examine
src - pointer to the null-terminated wide string to search for

Return value

Pointer to the first character of the found substring in dest, or a null pointer if no such substring is found. If src points to an empty string, dest is returned.

Example

#include <stdio.h>
#include <locale.h>
#include <wchar.h>
 
int main(void)
{
    setlocale(LC_ALL, "ru_RU.UTF-8");
 
    wchar_t str[5][64] = {
        L"Строка, где есть подстрока 'но'.",
        L"Строка, где такой подстроки нет.",
        L"Он здесь.",
        L"Здесь он.",
        L"Его нет."
    };
 
    for (size_t i = 0; i < 5; ++i) {
        if (wcsstr(str[i], L"но")) {
            wprintf(L"%ls\n", str[i]);
        }
    }
}

Output:

Строка, где есть подстрока 'но'.

References

See also

wcschr
(C95)
 finds the first occurrence of a wide character in a wide string
(function)
wcsrchr
(C95)
 finds the last occurrence of a wide character in a wide string
(function)
C++ documentation for wcsstr

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