[PATCH] tools: iio: iio_utils: fix digit calculation

[PATCH] tools: iio: iio_utils: fix digit calculation

[Matti Vaittinen]

[-- Attachment #1: Type: text/plain, Size: 1354 bytes --]

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>
---
 tools/iio/iio_utils.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/iio/iio_utils.c b/tools/iio/iio_utils.c
index aadee6d34c74..8d35893b2fa8 100644
--- a/tools/iio/iio_utils.c
+++ b/tools/iio/iio_utils.c
@@ -547,6 +547,10 @@ 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++;

base-commit: 4fe89d07dcc2804c8b562f6c7896a45643d34b2f
-- 
2.37.3


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

Re: [PATCH] tools: iio: iio_utils: fix digit calculation

[Jonathan Cameron]

On Thu, 13 Oct 2022 15:04:04 +0300
Matti Vaittinen <mazziesaccount@gmail.com> wrote:

> 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>
hi Matti

Makes sense.

Applied to the fixes-togreg branch of iio.git and marked for stable.


Thanks,

Jonathan

> ---
>  tools/iio/iio_utils.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/tools/iio/iio_utils.c b/tools/iio/iio_utils.c
> index aadee6d34c74..8d35893b2fa8 100644
> --- a/tools/iio/iio_utils.c
> +++ b/tools/iio/iio_utils.c
> @@ -547,6 +547,10 @@ 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++;
> 
> base-commit: 4fe89d07dcc2804c8b562f6c7896a45643d34b2f