[Gambas-bugtracker] Bug #1699: Pointers are not written to memory streams correctly when set to null

[bugtracker at gambaswiki.org]

http://gambaswiki.org/bugtracker/edit?object=BUG.1699&from=L21haW4-

Brian G reported a new bug.

Summary
-------

Pointers are not written to memory streams correctly when set to null

Type             : Bug
Priority         : Medium
Gambas version   : 3.14
Product          : Development Environment


Description
-----------

When writing a pointer to a memory stream if it is set to null or if you write null as a pointer, only the upper half of the value is written to memory

dim x as pointer = null

xfile = memory some_memory_pointer for write
write #xFile, null as pointer
    or
write #xFile, x as pointer 

memory before write = &H ff ff ff ff ff ff ff ff .... ff
memory after write  = &H ff ff ff ff 00 00 00 00 .... ff

but if I
dim y as long = 0
write #xFile, y as long

memory before write = &H ff ff ff ff ff ff ff ff .... ff
memory after write  = &H 00 00 00 00 00 00 00 00 .... ff

works correctly

it seems that pointers set to null and null only writes upper address part, but yet spaces over the lower part

But if the pointer has a value of a real address, it works fine.

Perhaps NULL is only defined as an integer or used as such?????


System information
------------------

[System]
Gambas=3.14.90
OperatingSystem=Linux
Kernel=5.3.0-24-generic
Architecture=x86_64
Distribution=Linux Mint 19.2 Tina
Desktop=MATE
Theme=Qt5CTProxy
Language=en_US.UTF-8
Memory=7340M

[Libraries]
Cairo=libcairo.so.2.11510.0
Curl=libcurl.so.4.5.0
DBus=libdbus-1.so.3.19.4
GStreamer=libgstreamer-1.0.so.0.1405.0
GTK+2=libgtk-x11-2.0.so.0.2400.32
GTK+3=libgtk-3.so.0.2200.30
OpenGL=libGL.so.1.0.0
Poppler=libpoppler.so.73.0.0
QT4=libQtCore.so.4.8.7
QT5=libQt5Core.so.5.9.5
SDL=libSDL-1.2.so.0.11.4
SQLite=libsqlite3.so.0.8.6

[Environment]
DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-Cc4TNls81i,guid=19d1db6b79269a4b515194a55df948aa
DISPLAY=:50
GB_GUI=gb.qt5
GIO_LAUNCHED_DESKTOP_FILE=<home>/Desktop/gambas3.desktop
GIO_LAUNCHED_DESKTOP_FILE_PID=16256
GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1
GTK_MODULES=gail:atk-bridge
GTK_OVERLAY_SCROLLING=0
HOME=<home>
INSIDE_CAJA_PYTHON=
LANG=en_US.UTF-8
LD_LIBRARY_PATH=
LOGNAME=<user>
MAIL=/var/mail/<user>
MATE_DESKTOP_SESSION_ID=this-is-deprecated
PATH=<home>/.local/bin:<home>/bin:<home>/.local/bin:<home>/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
PULSE_CLIENTCONFIG=<home>/.x2go/C-<user>-50-1576618149_stDMATE_dp24/.pulse-client.conf
PWD=<home>
QT_ACCESSIBILITY=1
QT_AUTO_SCREEN_SCALE_FACTOR=0
QT_GRAPHICSSYSTEM=native
QT_LOGGING_RULES=*.debug=false
QT_QPA_PLATFORMTHEME=qt5ct
QT_SCALE_FACTOR=1
SESSION_MANAGER=local/<hostname>:@/tmp/.ICE-unix/15792,unix/<hostname>:/tmp/.ICE-unix/15792
SHELL=/bin/bash
SHLVL=3
SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
SSH_CLIENT=73.48.159.94 51386 2727
SSH_CONNECTION=73.48.159.94 51386 192.168.1.8 2727
STARTUP=/usr/bin/im-launch /usr/bin/env LD_LIBRARY_PATH= mate-session
TERM=dumb
TZ=:/etc/localtime
USER=<user>
X2GO_AGENT_PID=15533
X2GO_SESSION=<user>-50-1576618149_stDMATE_dp24
XAUTHORITY=<home>/.Xauthority
XDG_CURRENT_DESKTOP=MATE
XDG_DATA_DIRS=<home>/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share
XDG_RUNTIME_DIR=/run/user/1000
XDG_SESSION_ID=313
XSESSION_EXEC=mate-session