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(* @NESTEDCOMMENTS := 'Yes' *)

(* @PATH := '\/Buffer Management' *)

(* @OBJECTFLAGS := '0, 8' *)

(* @SYMFILEFLAGS := '2048' *)

FUNCTION _BUFFER_CLEAR : BOOL

VAR_INPUT

        PT: POINTER TO BYTE;

        SIZE: UINT;

END_VAR

VAR

        ptw: POINTER TO DWORD;

        tempWORD;

        end,end32 : DWORD;

END_VAR

(*

version 1.2    31.oct. 2008

programmer     hugo

tested by      oscat

this function will initialize a given arrayof byte with 0.

the function needs to be called:      _buffer_clear(adr("array"),sizeof("array"));

this function will manipulate a given array.

the function manipulates the original array,it rerturnes true when finished.

because this function works with pointers itsvery time efficient and it needs no extra memory.

*)

(* @END_DECLARATION := '0' *)

(* this routine uses 32 bit access to gainspeed *)

(* first access bytes till pointer is alignedfor 32 bit access *)

temp := pt;

end := temp + UINT_TO_DWORD(size);

end32 := end - 3;

WHILE (pt < end) AND ((temp AND16#00000003) > 0) DO

        pt^:= 0;

        pt:= pt + 1;

        temp:= temp + 1;

END_WHILE;

(* pointer is aligned, now copy 32 bits at atime *)

ptw := pt;

WHILE ptw < end32 DO (* *)

        ptw^:= 0;

        ptw:= ptw + 4;

END_WHILE;

(* copy the remaining bytes in byte mode *)

pt := ptw;

WHILE pt < end DO

        pt^:= 0;

        pt:= pt + 1;

END_WHILE;

_BUFFER_CLEAR := TRUE;

(* revision History

hm      5.mar. 2008   rev 1.0

        originalversion

hm      16.mar. 2008  rev 1.1

        addedtype conversion to avoid warnings under codesys 30

        chagedtype of input size to uint

        deletedunused variable i

hm      31.oct. 2008  rev 1.2

        correctedan error while routine would write outside of arrays

*)

END_FUNCTION

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