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