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78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
/*-
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* Copyright (c) 2015 Dag-Erling Smørgrav
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* All rights reserved.
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*
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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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <errno.h>
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#include <limits.h>
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#include <stdint.h>
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#include <string.h>
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#include <cryb/coverage.h>
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#include <cryb/memcpy_s.h>
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#include <cryb/memset_s.h>
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/*
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* Like memcpy(), but checks for overflow and overwrites the destination
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* range with zeroes on error.
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*/
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int
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cryb_memcpy_s(void *d, size_t dsz, const void *s, size_t n)
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{
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unsigned int i;
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/* unrecoverable errors */
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if (d == NULL)
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return (EINVAL);
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CRYB_DISABLE_COVERAGE
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if (dsz > SIZE_MAX)
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return (ERANGE);
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CRYB_RESTORE_COVERAGE
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/* recoverable errors */
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if (s == NULL || n > dsz ||
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CRYB_DISABLE_COVERAGE
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n > SIZE_MAX ||
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CRYB_RESTORE_COVERAGE
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(s >= d && s < d + dsz) || (d >= s && d < s + n)) {
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memset_s(d, dsz, 0, dsz);
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if (n > dsz)
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return (EOVERFLOW);
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CRYB_DISABLE_COVERAGE
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if (n > SIZE_MAX)
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return (ERANGE);
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CRYB_RESTORE_COVERAGE
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return (EINVAL);
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}
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for (i = 0; i < dsz && i < n; ++i)
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((volatile unsigned char *)d)[i] = ((unsigned char *)s)[i];
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return (0);
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}
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