67 lines
1.3 KiB
C
67 lines
1.3 KiB
C
/* memmove.c - memory move file for string */
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/* Copyright 1992-1993 Wind River Systems, Inc. */
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/*
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modification history
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--------------------
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01c,25feb93,jdi documentation cleanup for 5.1.
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01b,20sep92,smb documentation additions
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01a,08jul92,smb written and documented.
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*/
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/*
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DESCRIPTION
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INCLUDE FILES: string.h
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SEE ALSO: American National Standard X3.159-1989
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NOMANUAL
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*/
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#include "vxWorks.h"
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#include "string.h"
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/*******************************************************************************
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*
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* memmove - copy memory from one location to another (ANSI)
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*
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* This routine copies <size> characters from the memory location <source> to
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* the location <destination>. It ensures that the memory is not corrupted
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* even if <source> and <destination> overlap.
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*
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* INCLUDE FILES: string.h
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*
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* RETURNS: A pointer to <destination>.
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*/
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void * memmove
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(
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void * destination, /* destination of copy */
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const void * source, /* source of copy */
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size_t size /* size of memory to copy */
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)
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{
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char * dest;
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const char *src;
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dest = destination;
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src = source;
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if ((src < dest) && (dest < (src + size)))
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{
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for (dest += size, src += size; size > 0; --size)
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*--dest = *--src;
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}
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else
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{
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while (size > 0)
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{
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size--;
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*dest++ = *src++;
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}
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}
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return (destination);
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}
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