Add nsswitch support.
[dragonfly.git] / lib / libc / string / memcmp.3
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1.\" Copyright (c) 1990, 1991, 1993
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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.
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36.\" @(#)memcmp.3 8.1 (Berkeley) 6/4/93
37.\" $FreeBSD: src/lib/libc/string/memcmp.3,v 1.5.2.3 2001/12/14 18:33:59 ru Exp $
1de703da 38.\" $DragonFly: src/lib/libc/string/memcmp.3,v 1.2 2003/06/17 04:26:46 dillon Exp $
984263bc
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39.\"
40.Dd June 4, 1993
41.Dt MEMCMP 3
42.Os
43.Sh NAME
44.Nm memcmp
45.Nd compare byte string
46.Sh LIBRARY
47.Lb libc
48.Sh SYNOPSIS
49.In string.h
50.Ft int
51.Fn memcmp "const void *b1" "const void *b2" "size_t len"
52.Sh DESCRIPTION
53The
54.Fn memcmp
55function
56compares byte string
57.Fa b1
58against byte string
59.Fa b2 .
60Both strings are assumed to be
61.Fa len
62bytes long.
63.Sh RETURN VALUES
64The
65.Fn memcmp
66function
67returns zero if the two strings are identical,
68otherwise returns the difference between the first two differing bytes
69(treated as unsigned char values, so that
70.Sq Li \e200
71is greater than
72.Sq Li \&\e0 ,
73for example).
74Zero-length strings are always identical.
75.Sh SEE ALSO
76.Xr bcmp 3 ,
77.Xr strcasecmp 3 ,
78.Xr strcmp 3 ,
79.Xr strcoll 3 ,
80.Xr strxfrm 3
81.Sh STANDARDS
82The
83.Fn memcmp
84function
85conforms to
86.St -isoC .