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1. (* @NESTEDCOMMENTS :='Yes'*)(* @PATH :='\/Buffer Management'*)(* @OBJECTFLAGS :='0, 8'*)(* @SYMFILEFLAGS :='2048'*)
2. FUNCTION _BUFFER_CLEAR : BOOL
3. VAR_INPUT
4.         PT : POINTER TO BYTE;
5.         SIZE : UINT;
6. END_VAR
7. VAR
8.         ptw : POINTER TO DWORD;
9.         temp: DWORD;
10.         end, end32 : DWORD;
11. END_VAR
14. (*
15. version 1.231. oct.2008
16. programmer         hugo
17. tested by        oscat
19. this function will initialize a given array of byte with 0.
20. the function needs to be called:_buffer_clear(adr("array"),sizeof("array"));
21. this function will manipulate a given array.
22. the function manipulates the original array, it rerturnes true when finished.
23. because this function works with pointers its very time efficient and it needs no extra memory.*)(* @END_DECLARATION :='0'*)(* this routine uses 32 bit access to gain speed *)(* first access bytes till pointer is aligned for32 bit access *)
24. temp := pt;
25. end := temp +UINT_TO_DWORD(size);
26. end32 := end -3;
27. WHILE (pt < end) AND ((temp AND 16#00000003)>0) DO
28.         pt^:=0;
29.         pt := pt +1;
30.         temp := temp +1;
31. END_WHILE;(* pointer is aligned, now copy 32 bits at a time *)
32. ptw := pt;
33. WHILE ptw < end32 DO (**)
34.         ptw^:=0;
35.         ptw := ptw +4;
36. END_WHILE;(* copy the remaining bytes in byte mode *)
37. pt := ptw;
38. WHILE pt < end DO
39.         pt^:=0;
40.         pt := pt +1;
41. END_WHILE;
43. _BUFFER_CLEAR := TRUE;

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