1 /* ========================================================================

2 * Copyright 1988-2006 University of Washington

3 *

4 * Licensed under the Apache License, Version 2.0 (the "License");

5 * you may not use this file except in compliance with the License.

6 * You may obtain a copy of the License at

7 *

8 * http://www.apache.org/licenses/LICENSE-2.0

9 *

10 *

11 * ========================================================================

12 */

13

14 /*

15 * Program: Memory move when no bcopy()

16 *

17 * Author: Mark Crispin

18 * Networks and Distributed Computing

19 * Computing & Communications

20 * University of Washington

21 * Administration Building, AG-44

22 * Seattle, WA 98195

23 * Internet: MRC@CAC.Washington.EDU

24 *

25 * Date: 11 May 1989

26 * Last Edited: 30 August 2006

27 */

28 

29 /* Copy memory block

30 * Accepts: destination pointer

31 * source pointer

32 * length

33 * Returns: destination pointer

34 */

35

36 void *memmove (void *s,void *ct,size_t n)

37 {

38 char *dp,*sp;

39 int i;

40 unsigned long dest = (unsigned long) s;

41 unsigned long src = (unsigned long) ct;

42 if (((dest < src) && ((dest + n) < src)) ||

43 ((dest > src) && ((src + n) < dest))) return (void *) memcpy (s,ct,n);

44 dp = (char *) s;

45 sp = (char *) ct;

46 if (dest < src) for (i = 0; i < n; ++i) dp[i] = sp[i];

47 else if (dest > src) for (i = n - 1; i >= 0; --i) dp[i] = sp[i];

48 return s;

49 }