Provided by: manpages-dev_4.15-1_all 

NAME
wcsstr - locate a substring in a wide-character string
SYNOPSIS
#include <wchar.h>
wchar_t *wcsstr(const wchar_t *haystack, const wchar_t *needle);
DESCRIPTION
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.
RETURN VALUE
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.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
┌───────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├───────────┼───────────────┼─────────┤
│ wcsstr() │ Thread safety │ MT-Safe │
└───────────┴───────────────┴─────────┘
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C99.
SEE ALSO
strstr(3), wcschr(3)
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project,
information about reporting bugs, and the latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2015-08-08 WCSSTR(3)