Leaked source code of windows server 2003
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/*
* MemCopy() * * A much safer version of memcpy that checks the value of the byte * count before calling the memcpy() function. This macro is only built * into the 16 bit non-debug builds. */
#ifndef __MEMCPY_H_
#define __MEMCPY_H_
#if defined(WIN16) && !defined(DEBUG)
#define MemCopy(_dst,_src,_cb) do \
{ \ size_t __cb = (size_t)(_cb); \ if (__cb) \ memcpy(_dst,_src,__cb); \ } while (FALSE)#else
#define MemCopy(_dst,_src,_cb) memcpy(_dst,_src,(size_t)(_cb))
#endif
#endif
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