mirror of
https://github.com/MariaDB/server.git
synced 2025-01-17 20:42:30 +01:00
57 lines
2.3 KiB
C
57 lines
2.3 KiB
C
/* Copyright (c) 2000 TXT DataKonsult Ab & Monty Program Ab
|
|
Copyright (c) 2009-2011, Monty Program Ab
|
|
|
|
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 the following disclaimer in
|
|
the documentation and/or other materials provided with the
|
|
distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``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 <COPYRIGHT HOLDER> 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(lhs, rhs, len)
|
|
compares the two memory areas lhs[0..len-1] ?? rhs[0..len-1]. It
|
|
returns an integer less than, equal to, or greater than 0 according
|
|
as lhs[-] is lexicographically less than, equal to, or greater than
|
|
rhs[-]. Note that this is not at all the same as bcmp, which tells
|
|
you *where* the difference is but not what.
|
|
|
|
Note: suppose we have int x, y; then memcmp(&x, &y, sizeof x) need
|
|
not bear any relation to x-y. This is because byte order is machine
|
|
dependent, and also, some machines have integer representations that
|
|
are shorter than a machine word and two equal integers might have
|
|
different values in the spare bits. On a ones complement machine,
|
|
-0 == 0, but the bit patterns are different.
|
|
*/
|
|
|
|
#include "strings.h"
|
|
|
|
#if !defined(HAVE_MEMCPY)
|
|
|
|
int memcmp(lhs, rhs, len)
|
|
register char *lhs, *rhs;
|
|
register int len;
|
|
{
|
|
while (--len >= 0)
|
|
if (*lhs++ != *rhs++) return (uchar) lhs[-1] - (uchar) rhs[-1];
|
|
return 0;
|
|
}
|
|
|
|
#endif
|