37 lines
1.7 KiB
C
37 lines
1.7 KiB
C
/****************************************************************
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* *
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* Copyright 2012 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#define BYPASS_MEMCPY_OVERRIDE /* Want to run original system memcpy() here */
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#include "gtm_string.h"
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#include "gtm_memcpy_validate_and_execute.h"
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#ifdef DEBUG /* Is only a debugging routine - nothing to see here for a production build - move along */
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/* Identify memcpy() invocations that should be memmove() instead. If this routine assert fails, the arguments
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* overlap so should be converted to memmove(). One exception to that rule which is currently bypassed is when
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* source and target are equal. There are no known implementation of memcpy() that would break in such a
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* condition so since at least two of these currently exist in GT.M (one in gtmcrypt.h on UNIX and one in
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* mu_cre_file on VMS), this routine does not cause an assert fail in that case.
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*/
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void *gtm_memcpy_validate_and_execute(void *target, const void *src, size_t len)
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{
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assert((0 <= (signed)len) && (len <= MAXPOSINT4)); /* nothing beyond max positive int4 allowed */
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if (target == src) /* Allow special case to go through but avoid actual memcpy() call */
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return target;
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assert(((char *)(target) > (char *)(src))
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? ((char *)(target) >= ((char *)(src) + (len)))
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: ((char *)(src) >= ((char *)(target) + (len))));
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return memcpy(target, src, len);
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}
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#endif
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