linux-kernel - Re: [PATCH] iio: core: Avoid double minus in sysfs output

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Date:	Thu, 18 Jul 2013 18:24:29 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Oleksandr Kravchenko <x0199363@...com>
CC:	jic23@....ac.uk, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Oleksandr Kravchenko <o.v.kravchenko@...ballogic.com>
Subject: Re: [PATCH] iio: core: Avoid double minus in sysfs output

On 07/18/2013 05:47 PM, Oleksandr Kravchenko wrote:
> From: Oleksandr Kravchenko <o.v.kravchenko@...ballogic.com>
> 
> This patch fixes the issue with double minus in output when
> reading channels from sysfs for IIO_VAL_INT_PLUS_MICRO and
> IIO_VAL_INT_PLUS_NANO cases. Until this patch if val and val2
> both are negatives output string contains "--" before
> digits. It is result of "-%d..." in sprintf() format.
> 

Hm, this might be a bug in a driver that is triggering this. The idea is
that val2 is only allowed to be negative if val is 0.

- Lars

> Signed-off-by: Oleksandr Kravchenko <o.v.kravchenko@...ballogic.com>
> ---
>  drivers/iio/industrialio-core.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index d56d122..b3d3959 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -383,14 +383,14 @@ static ssize_t iio_read_channel_info(struct device *dev,
>  		scale_db = true;
>  	case IIO_VAL_INT_PLUS_MICRO:
>  		if (val2 < 0)
> -			return sprintf(buf, "-%d.%06u%s\n", val, -val2,
> +			return sprintf(buf, "-%d.%06u%s\n", abs(val), -val2,
>  				scale_db ? " dB" : "");
>  		else
>  			return sprintf(buf, "%d.%06u%s\n", val, val2,
>  				scale_db ? " dB" : "");
>  	case IIO_VAL_INT_PLUS_NANO:
>  		if (val2 < 0)
> -			return sprintf(buf, "-%d.%09u\n", val, -val2);
> +			return sprintf(buf, "-%d.%09u\n", abs(val), -val2);
>  		else
>  			return sprintf(buf, "%d.%09u\n", val, val2);
>  	case IIO_VAL_FRACTIONAL:
> 

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