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Diffstat (limited to 'private/crt32/string/memcpy.c')
-rw-r--r-- | private/crt32/string/memcpy.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/private/crt32/string/memcpy.c b/private/crt32/string/memcpy.c new file mode 100644 index 000000000..a4348e74e --- /dev/null +++ b/private/crt32/string/memcpy.c @@ -0,0 +1,80 @@ +/*** +*memcpy.c - contains memcpy routine +* +* Copyright (c) 1988-1991, Microsoft Corporation. All right reserved. +* +*Purpose: +* memcpy() copies a source memory buffer to a destination buffer. +* Overlapping buffers are not treated specially, so propogation may occur. +* +*Revision History: +* 05-31-89 JCR C version created. +* 02-27-90 GJF Fixed calling type, #include <cruntime.h>, fixed +* copyright. +* 10-01-90 GJF New-style function declarator. Also, rewrote expr. to +* avoid using cast as an lvalue. +* 04-01-91 SRW Add #pragma function for i386 _WIN32_ and _CRUISER_ +* builds +* 04-05-91 GJF Speed up for large buffers by moving int-sized chunks +* as much as possible. +* 08-06-91 GJF Backed out 04-05-91 change. Pointers would have to be +* dword-aligned for this to work on MIPS. +* 07-16-93 SRW ALPHA Merge +* +*******************************************************************************/ + +#include <cruntime.h> +#include <string.h> + +#ifdef _MSC_VER +#pragma function(memcpy) +#endif + +/*** +*memcpy - Copy source buffer to destination buffer +* +*Purpose: +* memcpy() copies a source memory buffer to a destination memory buffer. +* This routine does NOT recognize overlapping buffers, and thus can lead +* to propogation. +* +* For cases where propogation must be avoided, memmove() must be used. +* +*Entry: +* void *dst = pointer to destination buffer +* const void *src = pointer to source buffer +* size_t count = number of bytes to copy +* +*Exit: +* Returns a pointer to the destination buffer +* +*Exceptions: +*******************************************************************************/ + +void * _CALLTYPE1 memcpy ( + void * dst, + const void * src, + size_t count + ) +{ + void * ret = dst; + +#if defined(_M_MRX000) || defined(_M_ALPHA) || defined(_M_PPC) + { + extern void RtlMoveMemory( void *, const void *, size_t count ); + + RtlMoveMemory( dst, src, count ); + } +#else + /* + * copy from lower addresses to higher addresses + */ + while (count--) { + *(char *)dst = *(char *)src; + dst = (char *)dst + 1; + src = (char *)src + 1; + } +#endif + + return(ret); +} |