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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/../c/string/wide/wcsstr.html below:

wcsstr - cppreference.com

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 dest is of type const T*, the return type is const wchar_t*.
Otherwise, if dest is of type T*, the return type is wchar_t*.
Otherwise, the behavior is undefined.

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.

[edit] Parameters dest - pointer to the null-terminated wide string to examine src - pointer to the null-terminated wide string to search for [edit] 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.

[edit] 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"Ð¡ÑÑÐ¾ÐºÐ°, Ð³Ð´Ðµ ÐµÑÑÑ Ð¿Ð¾Ð´ÑÑÑÐ¾ÐºÐ° 'Ð½Ð¾'.",
        L"Ð¡ÑÑÐ¾ÐºÐ°, Ð³Ð´Ðµ ÑÐ°ÐºÐ¾Ð¹ Ð¿Ð¾Ð´ÑÑÑÐ¾ÐºÐ¸ Ð½ÐµÑ.",
        L"ÐÐ½ Ð·Ð´ÐµÑÑ.",
        L"ÐÐ´ÐµÑÑ Ð¾Ð½.",
        L"ÐÐ³Ð¾ Ð½ÐµÑ."
    };
 
    for (size_t i = 0; i < 5; ++i) {
        if (wcsstr(str[i], L"Ð½Ð¾")) {
            wprintf(L"%ls\n", str[i]);
        }
    }
}

Output:

Ð¡ÑÑÐ¾ÐºÐ°, Ð³Ð´Ðµ ÐµÑÑÑ Ð¿Ð¾Ð´ÑÑÑÐ¾ÐºÐ° 'Ð½Ð¾'.

[edit] References

C11 standard (ISO/IEC 9899:2011):

7.29.4.5.6 The wcsstr function (p: 437)

C99 standard (ISO/IEC 9899:1999):

7.24.4.5.6 The wcsstr function (p: 383)

[edit] See also finds the first occurrence of a wide character in a wide string
(function) [edit] finds the last occurrence of a wide character in a wide string
(function) [edit]

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