Viewing file:  memmove2.c (1.32 KB) -rw-r--r--
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/* ========================================================================
* Copyright 1988-2006 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* Program: Memory move when no bcopy()
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 11 May 1989
* Last Edited: 30 August 2006
*/
/* Copy memory block
* Accepts: destination pointer
* source pointer
* length
* Returns: destination pointer
*/
void *memmove (void *s,void *ct,size_t n)
{
char *dp,*sp;
int i;
unsigned long dest = (unsigned long) s;
unsigned long src = (unsigned long) ct;
if (((dest < src) && ((dest + n) < src)) ||
((dest > src) && ((src + n) < dest))) return (void *) memcpy (s,ct,n);
dp = (char *) s;
sp = (char *) ct;
if (dest < src) for (i = 0; i < n; ++i) dp[i] = sp[i];
else if (dest > src) for (i = n - 1; i >= 0; --i) dp[i] = sp[i];
return s;
}
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