1.\" $OpenBSD: wmemcmp.3,v 1.3 2013/06/05 03:39:23 tedu Exp $ 2.\" 3.\" Copyright (c) 1990, 1991 The Regents of the University of California. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" Chris Torek and the American National Standards Committee X3, 8.\" on Information Processing Systems. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 3. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.Dd $Mdocdate: June 5 2013 $ 35.Dt WMEMCMP 3 36.Os 37.Sh NAME 38.Nm wmemcmp 39.Nd compare wide strings 40.Sh SYNOPSIS 41.In wchar.h 42.Ft int 43.Fn wmemcmp "const wchar_t *s1" "const wchar_t *s2" "size_t len" 44.Sh DESCRIPTION 45The 46.Fn wmemcmp 47function compares the wide string 48.Fa s1 49against the wide string 50.Fa s2 . 51Both wide strings are assumed to be 52.Fa len 53wide characters long. 54.Sh RETURN VALUES 55The 56.Fn wmemcmp 57function returns zero if the two wide strings are identical, 58otherwise the difference between the first two differing wide characters is 59returned. 60Zero-length wide strings are always identical. 61.Sh SEE ALSO 62.Xr memcmp 3 , 63.Xr wcscasecmp 3 , 64.Xr wcscmp 3 65.Sh STANDARDS 66The 67.Fn wmemcmp 68function conforms to 69.St -isoC-99 70and was first introduced in 71.St -isoC-amd1 . 72.Sh HISTORY 73The 74.Fn wmemcmp 75function was ported from 76.Nx 77and first appeared in 78.Ox 3.8 . 79