Time64 <> gconf ?

John Ralls jralls at ceridwen.us
Fri Sep 20 13:14:08 EDT 2013

On Sep 20, 2013, at 8:30 AM, Geert Janssens <janssens-geert at telenet.be> wrote:

> On Friday 20 September 2013 07:55:44 John Ralls wrote:
> > On Sep 20, 2013, at 3:34 AM, Geert Janssens <janssens-geert at telenet.be> wrote:
> > > John,
> > > 
> > > You have recently done a great job with our time handling code to
> > > solve the year 38 problem in GnuCash.
> > > 
> > > I didn't follow it in all detail, but from what I see you have
> > > switched to using time64 in many locations.
> > > 
> > > While converting from gconf to gsettings, I have found that there
> > > are a few preferences that store time as a 32-bit int. I presume
> > > that should change as well.
> > > 
> > > I will fix this for our gsetting backend, but I just wanted to make
> > > sure I do it correctly. If I store the time preferences as gint64
> > > in gsettings will that be sufficient ?
> > 
> > Geert,
> > 
> > I guess it depends on what kind of time needs to be stored; it might
> > make more sense, particularly if you're just interested in a date
> > rather than a date-time, to store an ISO-8601 string.
> > 
> I understand your point.
> On the other hand I'm working from the existing code. The gconf preference is linked to a GncDateEdit widget. This works works with date-time values internally, even though GnuCash only uses the date part in the gui. If I stick the internally used value, that does simplify my porting work a lot, so for now I prefer to simply store a time64 in preferences.
> > If you decide to use a gint64, it's clearer if you call it "time64";
> > that typedef is in gnc-date.h.
> This was already the case in the GncDateEdit code. The code that manages the link between the preference dialog and the gconf backend however used gnc_gconf_set_int() to store that time64 into gconf. That would obviously overflow in 2038.
> It's only in that spot that I needed to know the proper way to handle value conversion.
> There is no gconf function to handle a time64 value, nor is there a gsettings function for it. So at the border between gnucash and gsettings, I will have to call it int64, but that will only be right where the gsettings functions are called. Just before/after the value will be converted form/into a time64.


It's a typedef. The compiler should treat time64 and gint64 (and long long, which is what the C99 standard calls it) interchangeably without casting.

There's no g_settings_set_int64(), either. You'll have to use 
g_settings_set_variant (g_variant_new_int64 (time)) and deal with the GVariant's
memory yourself on retrieval.

John Ralls

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