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'\" t
.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: GPL-2.0-or-later
.\"
.TH wcsstr 3 2025-05-17 "Linux man-pages (unreleased)"
.SH NAME
wcsstr \- locate a substring in a wide-character string
.SH LIBRARY
Standard C library
.RI ( libc ,\~ \-lc )
.SH SYNOPSIS
.nf
.B #include <wchar.h>
.P
.BI "wchar_t *wcsstr(const wchar_t *" haystack ", const wchar_t *" needle );
.fi
.SH DESCRIPTION
The
.BR wcsstr ()
function is the wide-character equivalent of the
.BR strstr (3)
function.
It searches for the first occurrence of the wide-character string
.I needle
(without its terminating null wide character (L\[aq]\[rs]0\[aq]))
as a substring in the wide-character string
.IR haystack .
.SH RETURN VALUE
The
.BR wcsstr ()
function returns a pointer to the first occurrence of
.I needle
in
.IR haystack .
It returns NULL if
.I needle
does not occur
as a substring in
.IR haystack .
.P
Note the special case:
If
.I needle
is the empty wide-character string,
the return value is always
.I haystack
itself.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lbx lb lb
l l l.
Interface Attribute Value
T{
.na
.nh
.BR wcsstr ()
T} Thread safety MT-Safe
.TE
.SH STANDARDS
C11, POSIX.1-2008.
.SH HISTORY
POSIX.1-2001, C99.
.SH SEE ALSO
.BR strstr (3),
.BR wcschr (3)
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