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(* MemUtils.mod provides some basic memory utilities.
Copyright (C) 2001-2025 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Modula-2 is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE MemUtils ;
FROM SYSTEM IMPORT WORD, BYTE, TSIZE ;
(*
MemCopy - copys a region of memory to the required destination.
*)
PROCEDURE MemCopy (from: ADDRESS; length: CARDINAL; to: ADDRESS) ;
VAR
pwb, pwa: POINTER TO WORD ;
pbb, pba: POINTER TO BYTE ;
BEGIN
WHILE length>=TSIZE(WORD) DO
pwa := from ;
pwb := to ;
pwb^ := pwa^ ;
INC(from , TSIZE(WORD)) ;
INC(to , TSIZE(WORD)) ;
DEC(length, TSIZE(WORD))
END ;
WHILE length>0 DO
pba := from ;
pbb := to ;
pbb^ := pba^ ;
INC(from , TSIZE(BYTE)) ;
INC(to , TSIZE(BYTE)) ;
DEC(length, TSIZE(BYTE))
END
END MemCopy ;
(*
MemZero - sets a region of memory: a..a+length to zero.
*)
PROCEDURE MemZero (a: ADDRESS; length: CARDINAL) ;
VAR
pwa: POINTER TO WORD ;
pba: POINTER TO BYTE ;
BEGIN
pwa := a ;
WHILE length>=TSIZE(WORD) DO
pwa^ := WORD(0) ;
INC(pwa, TSIZE(WORD)) ;
DEC(length, TSIZE(WORD))
END ;
pba := ADDRESS(pwa) ;
WHILE length>=TSIZE(BYTE) DO
pba^ := BYTE(0) ;
INC(pba, TSIZE(BYTE)) ;
DEC(length, TSIZE(BYTE))
END
END MemZero ;
END MemUtils.
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