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tools: iio: iio_utils: fix digit calculation

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commit 72b2aa38191bcba28389b0e20bf6b4f15017ff2b upstream.

The iio_utils uses a digit calculation in order to know length of the
file name containing a buffer number. The digit calculation does not
work for number 0.

This leads to allocation of one character too small buffer for the
file-name when file name contains value '0'. (Eg. buffer0).

Fix digit calculation by returning one digit to be present for number
'0'.

Fixes: 096f9b862e60 ("tools:iio:iio_utils: implement digit calculation")
Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://lore.kernel.org/r/Y0f+tKCz+ZAIoroQ@dc75zzyyyyyyyyyyyyycy-3.rev.dnainternet.fi
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matti Vaittinen 2022-10-13 15:04:04 +03:00 committed by Greg Kroah-Hartman
parent 5e4ce28ad9
commit 48797c0bb8
1 changed files with 4 additions and 0 deletions
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4
tools/iio/iio_utils.c
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@ -546,6 +546,10 @@ static int calc_digits(int num)
{
int count = 0;
/* It takes a digit to represent zero */
if (!num)
return 1;
while (num != 0) {
num /= 10;
count++;