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8ddc8d0117
Mingw does not define WORDSIZE and incorrect int width was used. Change-Id: Idc9f560dd1c722d51f6e54ba2342feafa13f8fa5 Signed-off-by: Greg Tucker <greg.b.tucker@intel.com>
70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/**********************************************************************
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Copyright(c) 2011-2018 Intel Corporation All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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* Neither the name of Intel Corporation nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**********************************************************************/
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#include <stdint.h>
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#include <stddef.h>
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int mem_zero_detect_base(void *buf, size_t n)
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{
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unsigned char *c;
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uintmax_t a = 0, *p = buf;
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// Check buffer in native machine width comparisons
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while (n >= sizeof(*p)) {
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n -= sizeof(*p);
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if (*p++ != 0)
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return -1;
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}
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// Check remaining bytes
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c = (unsigned char *)p;
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switch (n) {
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case 7:
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a |= *c++; // fall through to case 6,5,4
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case 6:
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a |= *c++; // fall through to case 5,4
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case 5:
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a |= *c++; // fall through to case 4
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case 4:
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a |= *((unsigned int *)c);
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break;
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case 3:
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a |= *c++; // fall through to case 2
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case 2:
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a |= *((unsigned short *)c);
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break;
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case 1:
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a |= *c;
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break;
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}
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return (a == 0) ? 0 : -1;
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}
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