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/* Copyright (c) 2017 SiFive Inc. All rights reserved.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions
of the BSD License. This program is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
including the implied warranties of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. A copy of this license is available at
http://www.opensource.org/licenses.
*/
#ifndef _SYS_STRING_H
#define _SYS_STRING_H
static __inline unsigned long __libc_detect_null(unsigned long w)
{
unsigned long mask = 0x7f7f7f7f;
if (sizeof (long) == 8)
mask = ((mask << 16) << 16) | mask;
return ~(((w & mask) + mask) | w | mask);
}
#endif
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