On Sun, Aug 03, 2014 at 09:53:38PM +0400, Antony Pavlov wrote:
> On Sun, 03 Aug 2014 18:17:45 +0200
> Jan Lübbe <jlu@xxxxxxxxxxxxxx> wrote:
>
> > Hi,
> >
> > On Sat, 2014-08-02 at 09:45 +0400, Antony Pavlov wrote:
> > >
> > > compatlen=$($FDTGET -t s "$dtb" / compatible | wc -c)
> > > - echo ".int 0x640c8005"
> > > - echo ".int " $compatlen
> > > + echo ".byte 0x05, 0x80, 0x0c, 0x64"
> > > + python -c "print(\".byte 0x%02x, 0x%02x, 0x%02x, 0x%02x\\n\" % ($compatlen & 0xff, ($compatlen >> 8) & 0xff, ($compatlen >> 16) & 0xff, ($compatlen >> 24) & 0xff))"
> >
> > Rather than adding a build-time dependency on python, maybe we should
> > just handle this in C?
>
> We use sphinx for documentation generation so we already have dependency on python.
>
> Here is an another solution:
>
> - echo ".int " $compatlen
> + echo ".byte " $(printf "%08x" $compatlen | sed "s/\(..\)/0x\1\n/g" | tac | xargs | sed "s/ /, /g")
yet another alternative:
awk -v var=$compatlen 'BEGIN { for (i = 0; i < 4; ++i) ba[i] = and(rshift(var, 8 * i), 0xff); printf ".byte 0x%02x, 0x%02x, 0x%02x, 0x%02x\n", ba[0], ba[1], ba[2], ba[3]; }'
It's not shorter, but maybe a bit more obvious what it does.
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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