WCSSTR(3) Linux Programmer's Manual WCSSTR(3)

wcsstr - locate a substring in a wide-character string

#include <wchar.h>
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 haystack.

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 itself.

For an explanation of the terms used in this section, see attributes(7).
Interface Attribute Value
wcsstr () Thread safety MT-Safe

POSIX.1-2001, POSIX.1-2008, C99.

strstr(3), wcschr(3)
2019-03-06 GNU