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45 lines
1.7 KiB
C
45 lines
1.7 KiB
C
/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* memcmp(lhs, rhs, len)
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compares the two memory areas lhs[0..len-1] ?? rhs[0..len-1]. It
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returns an integer less than, equal to, or greater than 0 according
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as lhs[-] is lexicographically less than, equal to, or greater than
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rhs[-]. Note that this is not at all the same as bcmp, which tells
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you *where* the difference is but not what.
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Note: suppose we have int x, y; then memcmp(&x, &y, sizeof x) need
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not bear any relation to x-y. This is because byte order is machine
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dependent, and also, some machines have integer representations that
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are shorter than a machine word and two equal integers might have
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different values in the spare bits. On a ones complement machine,
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-0 == 0, but the bit patterns are different.
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*/
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#include "strings.h"
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#if !defined(HAVE_MEMCPY)
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int memcmp(lhs, rhs, len)
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register char *lhs, *rhs;
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register int len;
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{
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while (--len >= 0)
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if (*lhs++ != *rhs++) return (uchar) lhs[-1] - (uchar) rhs[-1];
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return 0;
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}
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#endif
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