.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
.\"
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.\" References consulted:
.\"   GNU glibc-2 source code and manual
.\"   Dinkumware C library reference http://www.dinkumware.com/
.\"   OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
.\"   ISO/IEC 9899:1999
.\"
.TH WCSNCMP 3  2021-03-22 "GNU" "Linux Programmer's Manual"
.SH NAME
wcsncmp \- compare two fixed-size wide-character strings
.SH SYNOPSIS
.nf
.B #include <wchar.h>
.PP
.BI "int wcsncmp(const wchar_t *" s1 ", const wchar_t *" s2 ", 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\e0\(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).
.ad l
.nh
.TS
allbox;
lbx lb lb
l l l.
Interface	Attribute	Value
T{
.BR wcsncmp ()
T}	Thread safety	MT-Safe
.TE
.hy
.ad
.sp 1
.SH CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C99.
.SH SEE ALSO
.BR strncmp (3),
.BR wcsncasecmp (3)