1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. 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.\" from: @(#)strcmp.3 8.1 (Berkeley) 6/4/93 33.\" $NetBSD: strcmp.3,v 1.14 2016/07/14 17:09:03 abhinav Exp $ 34.\" 35.Dd June 4, 1993 36.Dt STRCMP 3 37.Os 38.Sh NAME 39.Nm strcmp , 40.Nm strncmp 41.Nd compare strings 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.In string.h 46.Ft int 47.Fn strcmp "const char *s1" "const char *s2" 48.Ft int 49.Fn strncmp "const char *s1" "const char *s2" "size_t len" 50.Sh DESCRIPTION 51The 52.Fn strcmp 53and 54.Fn strncmp 55functions 56lexicographically compare the nul-terminated strings 57.Fa s1 58and 59.Fa s2 . 60.Sh RETURN VALUES 61The 62.Fn strcmp 63and 64.Fn strncmp 65functions return an integer greater than, equal to, or less than 0, according 66to whether 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 75The 76.Fn strncmp 77function compares not more than 78.Fa len 79characters. 80.Sh SEE ALSO 81.Xr bcmp 3 , 82.Xr memcmp 3 , 83.Xr strcasecmp 3 , 84.Xr strcoll 3 , 85.Xr strxfrm 3 86.Sh STANDARDS 87The 88.Fn strcmp 89and 90.Fn strncmp 91functions 92conform to 93.St -ansiC . 94.Sh NOTES 95If 96.Fa len 97is 0, 98.Fn strncmp 99always returns 0. 100