memcmp.3 revision 319292
Copyright (c) 1990, 1991, 1993
The Regents of the University of California. All rights reserved.
This code is derived from software contributed to Berkeley by
Chris Torek and the American National Standards Committee X3,
on Information Processing Systems.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
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documentation and/or other materials provided with the distribution.
3. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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@(#)memcmp.3 8.1 (Berkeley) 6/4/93
$FreeBSD: stable/11/lib/libc/string/memcmp.3 319292 2017-05-31 06:47:56Z delphij $
.Dd August 15, 2016 .Dt MEMCMP 3 .Os .Sh NAME .Nm memcmp .Nd compare byte string .Sh LIBRARY .Lb libc .Sh SYNOPSIS n string.h .Ft int .Fn memcmp "const void *b1" "const void *b2" "size_t len" .Sh DESCRIPTION The .Fn memcmp function compares byte string .Fa b1 against byte string .Fa b2 . Both strings are assumed to be .Fa len bytes long. .Sh RETURN VALUES The .Fn memcmp function returns zero if the two strings are identical, otherwise returns the difference between the first two differing bytes (treated as .Vt "unsigned char" values, so that .Sq Li \e200 is greater than .Sq Li \e0 , for example). Zero-length strings are always identical. .Sh SEE ALSO .Xr bcmp 3 , .Xr strcasecmp 3 , .Xr strcmp 3 , .Xr strcoll 3 , .Xr strxfrm 3 , .Xr timingsafe_memcmp 3 , .Xr wmemcmp 3 .Sh STANDARDS The .Fn memcmp function conforms to .St -isoC .
The Regents of the University of California. All rights reserved.
This code is derived from software contributed to Berkeley by
Chris Torek and the American National Standards Committee X3,
on Information Processing Systems.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
@(#)memcmp.3 8.1 (Berkeley) 6/4/93
$FreeBSD: stable/11/lib/libc/string/memcmp.3 319292 2017-05-31 06:47:56Z delphij $
.Dd August 15, 2016 .Dt MEMCMP 3 .Os .Sh NAME .Nm memcmp .Nd compare byte string .Sh LIBRARY .Lb libc .Sh SYNOPSIS n string.h .Ft int .Fn memcmp "const void *b1" "const void *b2" "size_t len" .Sh DESCRIPTION The .Fn memcmp function compares byte string .Fa b1 against byte string .Fa b2 . Both strings are assumed to be .Fa len bytes long. .Sh RETURN VALUES The .Fn memcmp function returns zero if the two strings are identical, otherwise returns the difference between the first two differing bytes (treated as .Vt "unsigned char" values, so that .Sq Li \e200 is greater than .Sq Li \e0 , for example). Zero-length strings are always identical. .Sh SEE ALSO .Xr bcmp 3 , .Xr strcasecmp 3 , .Xr strcmp 3 , .Xr strcoll 3 , .Xr strxfrm 3 , .Xr timingsafe_memcmp 3 , .Xr wmemcmp 3 .Sh STANDARDS The .Fn memcmp function conforms to .St -isoC .