FFI: Make FFI call return nil when C function returns NULL
Before when a C function returned NULL pointer, an ExternalAddress with
address 0 wes returned which required an extra check in a caller to
convert it to nil, which would be the customary. This commit automatically
converts NULL pointers to Smalltalk `nil` as a courtesy to a Smalltalker.
"
COPYRIGHT (c) 2004 by eXept Software AG
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
"{ Package: 'stx:libbasic' }"
OSFileHandle subclass:#Win32FILEHandle
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'OS-Windows'
!
!Win32FILEHandle primitiveDefinitions!
%{
#include <stdio.h>
%}
! !
!Win32FILEHandle class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 2004 by eXept Software AG
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
!
documentation
"
I represent a FILE*, as used in the stdio library.
Since most stdio libs are inherently buggy, thread-unsave
and hard to use in a multithreading environment,
these will no longer be used in future ST/X versions.
However, they may be useful when interfacing to external
libraries...
"
! !
!Win32FILEHandle methodsFor:'release'!
closeFile
"close the file"
%{
FILE *f = (FILE *)(__externalAddressVal(self));
if (f) {
__externalAddressVal(self) = NULL;
fclose(f);
}
%}.
! !
!Win32FILEHandle class methodsFor:'documentation'!
version
^ '$Header: /cvs/stx/stx/libbasic/Win32FILEHandle.st,v 1.5 2011-09-29 11:19:13 cg Exp $'
! !