lib/libc/string/strcmp.3 - master - nerfur/openbsd-src

lib/libc/string/strcmp.3
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jsg
libc string functions were not ported from pwb to v7
01 авг 2022, 03:04
01 авг 2022, 03:04550d56d
.\"	$OpenBSD: strcmp.3,v 1.15 2022/08/01 00:04:46 jsg Exp $
.\"
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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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.Dd $Mdocdate: August 1 2022 $
.Dt STRCMP 3
.Os
.Sh NAME
.Nm strcmp ,
.Nm strncmp
.Nd compare strings
.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 .
The
.Fn strncmp
function compares at most
.Fa len
characters.
.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 .
.Sh SEE ALSO
.Xr bcmp 3 ,
.Xr memcmp 3 ,
.Xr strcasecmp 3 ,
.Xr strcoll 3 ,
.Xr strxfrm 3 ,
.Xr wcscmp 3
.Sh STANDARDS
The
.Fn strcmp
and
.Fn strncmp
functions conform to
.St -ansiC .
.Sh HISTORY
The
.Fn strcmp
function first appeared outside of Bell Labs in PWB/UNIX 1.0.
.Fn strncmp
first appeared in
.At v7 .