1.\" Copyright (c) 1990, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Chris Torek and the American National Standards Committee X3, 6.\" on Information Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" $OpenBSD: strcmp.3,v 1.9 2007/05/31 19:19:32 jmc Exp $ 33.\" 34.Dd $Mdocdate: May 31 2007 $ 35.Dt STRCMP 3 36.Os 37.Sh NAME 38.Nm strcmp , 39.Nm strncmp 40.Nd compare strings 41.Sh SYNOPSIS 42.Fd #include <string.h> 43.Ft int 44.Fn strcmp "const char *s1" "const char *s2" 45.Ft int 46.Fn strncmp "const char *s1" "const char *s2" "size_t len" 47.Sh DESCRIPTION 48The 49.Fn strcmp 50and 51.Fn strncmp 52functions lexicographically compare the NUL-terminated strings 53.Fa s1 54and 55.Fa s2 . 56.Sh RETURN VALUES 57The 58.Fn strcmp 59and 60.Fn strncmp 61return an integer greater than, equal to, or less than 0, according 62to whether the string 63.Fa s1 64is greater than, equal to, or less than the string 65.Fa s2 . 66The comparison is done using unsigned characters, so that 67.Ql \e200 68is greater than 69.Ql \e0 . 70.Pp 71.Fn strncmp 72compares at most 73.Fa len 74characters. 75.Sh SEE ALSO 76.Xr bcmp 3 , 77.Xr memcmp 3 , 78.Xr strcasecmp 3 , 79.Xr strcoll 3 , 80.Xr strxfrm 3 81.Sh STANDARDS 82The 83.Fn strcmp 84and 85.Fn strncmp 86functions conform to 87.St -ansiC . 88