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. All advertising materials mentioning features or use of this software 17.\" must display the following acknowledgement: 18.\" This product includes software developed by the University of 19.\" California, Berkeley and its contributors. 20.\" 4. Neither the name of the University nor the names of its contributors 21.\" may be used to endorse or promote products derived from this software 22.\" without specific prior written permission. 23.\" 24.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34.\" SUCH DAMAGE. 35.\" 36.\" $OpenBSD: strcmp.3,v 1.5 2000/04/21 15:24:19 aaron Exp $ 37.\" 38.Dd June 29, 1991 39.Dt STRCMP 3 40.Os 41.Sh NAME 42.Nm strcmp , 43.Nm strncmp 44.Nd compare strings 45.Sh SYNOPSIS 46.Fd #include <string.h> 47.Ft int 48.Fn strcmp "const char *s1" "const char *s2" 49.Ft int 50.Fn strncmp "const char *s1" "const char *s2" "size_t len" 51.Sh DESCRIPTION 52The 53.Fn strcmp 54and 55.Fn strncmp 56functions lexicographically compare the null-terminated strings 57.Fa s1 58and 59.Fa s2 . 60.Sh RETURN VALUES 61The 62.Fn strcmp 63and 64.Fn strncmp 65return an integer greater than, equal to, or less than 0, according 66as the string 67.Fa s1 68is greater than, equal to, or less than the string 69.Fa s2 . 70The comparison is done using unsigned characters, so that 71.Ql \e200 72is greater than 73.Ql \e0 . 74.Pp 75.Fn strncmp 76compares at most 77.Fa len 78characters. 79.Sh SEE ALSO 80.Xr bcmp 3 , 81.Xr memcmp 3 , 82.Xr strcasecmp 3 , 83.Xr strcoll 3 , 84.Xr strxfrm 3 85.Sh STANDARDS 86The 87.Fn strcmp 88and 89.Fn strncmp 90functions conform to 91.St -ansiC . 92