memcmp.c revision 7c2fbfb345896881c631598ee3852ce9ce33fb07
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2008 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
#include <ast.h>
#if _lib_memcmp
NoN(memcmp)
#else
int
memcmp(const void* ab1, const void* ab2, size_t n)
{
register const unsigned char* b1 = (const unsigned char*)ab1;
register const unsigned char* b2 = (const unsigned char*)ab2;
register const unsigned char* e = b1 + n;
while (b1 < e)
if (*b1++ != *b2++)
return(*--b1 - *--b2);
return(0);
}
#endif