.\" Copyright (c) 1990, 1991, 1993
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.\" This code is derived from software contributed to Berkeley by
.\" Chris Torek and the American National Standards Committee X3,
.\" on Information Processing Systems.
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.\"     from: @(#)strcmp.3	8.1 (Berkeley) 6/4/93
.\"	$NetBSD: strcmp.3,v 1.14 2016/07/14 17:09:03 abhinav Exp $
.\"
.Dd June 4, 1993
.Dt STRCMP 3
.Os
.Sh NAME
.Nm strcmp ,
.Nm strncmp
.Nd compare strings
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In string.h
.Ft int
.Fn strcmp "const char *s1" "const char *s2"
.Ft int
.Fn strncmp "const char *s1" "const char *s2" "size_t len"
.Sh DESCRIPTION
The
.Fn strcmp
and
.Fn strncmp
functions
lexicographically compare the nul-terminated strings
.Fa s1
and
.Fa s2 .
.Sh RETURN VALUES
The
.Fn strcmp
and
.Fn strncmp
functions return an integer greater than, equal to, or less than 0, according
to whether the string
.Fa s1
is greater than, equal to, or less than the string
.Fa s2 .
The comparison is done using unsigned characters, so that
.Ql \e200
is greater than
.Ql \e0 .
.Pp
The
.Fn strncmp
function compares not more than
.Fa len
characters.
.Sh SEE ALSO
.Xr bcmp 3 ,
.Xr memcmp 3 ,
.Xr strcasecmp 3 ,
.Xr strcoll 3 ,
.Xr strxfrm 3
.Sh STANDARDS
The
.Fn strcmp
and
.Fn strncmp
functions
conform to
.St -ansiC .
.Sh NOTES
If
.Fa len
is 0,
.Fn strncmp
always returns 0.