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'\" t
.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: GPL-2.0-or-later
.\"
.TH wcsncmp 3 2025-06-28 "Linux man-pages (unreleased)"
.SH NAME
wcsncmp \- compare two fixed-size wide-character strings
.SH LIBRARY
Standard C library
.RI ( libc ,\~ \-lc )
.SH SYNOPSIS
.nf
.B #include <wchar.h>
.P
.BR "int wcsncmp(" "size_t n;"
.BI " const wchar_t " s1 [ n "], const wchar_t " s2 [ n "], \
size_t " n );
.fi
.SH DESCRIPTION
The
.BR wcsncmp ()
function is the wide-character equivalent of the
.BR strncmp (3)
function.
It compares the wide-character string pointed to by
.I s1
and the
wide-character string pointed to by
.IR s2 ,
but at most
.I n
wide
characters from each string.
In each string, the comparison extends only up
to the first occurrence of a null wide character (L\[aq]\[rs]0\[aq]), if any.
.SH RETURN VALUE
The
.BR wcsncmp ()
function returns zero if the wide-character strings at
.I s1
and
.IR s2 ,
truncated to at most length
.IR n ,
are equal.
It returns an integer greater than zero if at the first differing position
.I i
.RI ( i
<
.IR n ),
the corresponding wide-character
.I s1[i]
is
greater than
.IR s2[i] .
It returns an integer less than zero if at the first
differing position
.I i
.RI ( i
<
.IR n ),
the corresponding
wide-character
.I s1[i]
is less than
.IR s2[i] .
.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 wcsncmp ()
T} Thread safety MT-Safe
.TE
.SH STANDARDS
C11, POSIX.1-2008.
.SH HISTORY
POSIX.1-2001, C99.
.SH SEE ALSO
.BR strncmp (3),
.BR wcsncasecmp (3)
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