On Sat, Jul 25, 2009 at 03:31:29PM +0200, ext Hans Verkuil wrote:
> On Saturday 25 July 2009 15:15:24 Eduardo Valentin wrote:
> > On Sat, Jul 25, 2009 at 03:20:53PM +0200, ext Hans Verkuil wrote:
> > > > + switch (control->id) {
> > > > + case V4L2_CID_RDS_TX_PS_NAME:
> > > > + if (strlen(sdev->rds_info.ps_name) + 1 > control->length)
> > > > {
> > > > + control->length = strlen(sdev->rds_info.ps_name)
> > > > + 1;
> > >
> > > I recommend setting length to the actual maximum MAX_RDS_PS_NAME+1.
> > >
> > > > + rval = -ENOSPC;
> > > > + goto exit;
> > > > + }
> > > > + rval = copy_to_user(control->string,
> > > > sdev->rds_info.ps_name,
> > > > + strlen(sdev->rds_info.ps_name) +
> > > > 1);
> > > > + break;
> > > > +
> > > > + case V4L2_CID_RDS_TX_RADIO_TEXT:
> > > > + if (strlen(sdev->rds_info.radio_text) + 1 >
> > > > control->length) {
> > > > + control->length =
> > > > strlen(sdev->rds_info.radio_text) + 1;
> > >
> > > Ditto.
> >
> > Right, I think doing the way you are proposing is to avoid changes that may
> > generate
> > failures in the following reads.
> >
> > I 'll change this in the v11 as well.
>
> OK.
>
> > > > +struct rds_info {
> > > > + u32 pi;
> > > > +#define MAX_RDS_PTY 31
> > > > + u32 pty;
> > > > +#define MAX_RDS_DEVIATION 90000
> > > > + u32 deviation;
> > > > +#define MAX_RDS_PS_NAME 96
> > > > + u8 ps_name[MAX_RDS_PS_NAME + 1];
> > > > +#define MAX_RDS_RADIO_TEXT 384
> > >
> > > I'm surprised at these MAX string lengths. Looking at the RDS standard it
> > > seems that the max length for the PS_NAME is 8 and for RADIO_TEXT it is
> > > either 32 (2A group) or 64 (2B group). I don't know which group the si4713
> > > uses.
> > >
> > > Can you clarify how this is used?
>
> Did you see this comment as well? I'm quite interested in this.
I missed this one. But is basically what Eero said. Receivers scroll it with 8xn
sized PS names.
>
> Hans
>
> --
> Hans Verkuil - video4linux developer - sponsored by TANDBERG Telecom
--
Eduardo Valentin
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