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Fix ownership issues in preferences code

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Each preferences object owns its string members. In three cases, pointers
were copied instead of strings, leading to (in the best case) dangling
pointers if the user edited values:
1) In the GET_TXT macro in core/prefs-macros.h
2) In the PreferencesDialog::defaultsRequested() method
3) In main() of the mobile version

This patch fixes these issues, by using copy_string() or copy_prefs()
as appropriate.

The only reason that the old code didn't crash regularly is that the
default_prefs object was only used at startup and defaultsRequested()
is (at the moment?) dead code.

This patch also aligns the backslashes in core/pref.h and fixes a typo.
The declaration of copy_prefs() is moved to the core/prefs.h header.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2017-11-25 09:22:19 +01:00 committed by Dirk Hohndel
parent cc5a56b275
commit 4fb01dd766
5 changed files with 9 additions and 9 deletions
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1
core/pref.h
View file

@ -189,6 +189,7 @@ extern const char *system_default_directory(void);
extern const char *system_default_filename();
extern bool subsurface_ignore_font(const char *font);
extern void subsurface_OS_pref_setup();
extern void copy_prefs(struct preferences *src, struct preferences *dest);
#ifdef __cplusplus
}

10
core/prefs-macros.h
View file

@ -18,10 +18,10 @@
else \
prefs.units.field = default_prefs.units.field
#define GET_UNIT_BOOL(name, field) \
#define GET_UNIT_BOOL(name, field) \
v = s.value(QString(name)); \
if (v.isValid()) \
prefs.units.field = v.toBool(); \
prefs.units.field = v.toBool(); \
else \
prefs.units.field = default_prefs.units.field
@ -53,10 +53,10 @@
else \
prefs.field = default_prefs.field
#define GET_INT_DEF(name, field, defval) \
#define GET_INT_DEF(name, field, defval) \
v = s.value(QString(name)); \
if (v.isValid()) \
prefs.field = v.toInt(); \
prefs.field = v.toInt(); \
else \
prefs.field = defval
@ -65,7 +65,7 @@
if (v.isValid()) \
prefs.field = strdup(v.toString().toUtf8().constData()); \
else \
prefs.field = default_prefs.field
prefs.field = copy_string(default_prefs.field)
#define SAVE_OR_REMOVE_SPECIAL(_setting, _default, _compare, _value) \
if (_compare != _default) \

1
core/subsurfacestartup.h
View file

@ -17,7 +17,6 @@ extern bool imported;
void setup_system_prefs(void);
void parse_argument(const char *arg);
void free_prefs(void);
void copy_prefs(struct preferences *src, struct preferences *dest);
void print_files(void);
void print_version(void);

4
desktop-widgets/preferences/preferencesdialog.cpp
View file

@ -109,7 +109,7 @@ void PreferencesDialog::refreshPages()
curr->setParent(0);
}
// Readd things.
// Read things
Q_FOREACH(AbstractPreferencesWidget *page, pages) {
QListWidgetItem *item = new QListWidgetItem(page->icon(), page->name());
pagesList->addItem(item);
@ -139,7 +139,7 @@ void PreferencesDialog::cancelRequested()
void PreferencesDialog::defaultsRequested()
{
prefs = default_prefs;
copy_prefs(&default_prefs, &prefs);
Q_FOREACH(AbstractPreferencesWidget *page, pages) {
page->refreshSettings();
}

2
subsurface-mobile-main.cpp
View file

@ -41,7 +41,7 @@ int main(int argc, char **argv)
setup_system_prefs();
if (uiLanguage(0).contains("-US"))
default_prefs.units = IMPERIAL_units;
prefs = default_prefs;
copy_prefs(&default_prefs, &prefs);
fill_profile_color();
fill_computer_list();