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

From: Matti Vaittinen <mazziesaccount@gmail.com>
To: Matti Vaittinen <mazziesaccount@gmail.com>,
	Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Cc: Jonathan Cameron <jic23@kernel.org>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Hartmut Knaack <knaack.h@gmx.de>,
	linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] tools: iio: iio_utils: fix digit calculation
Date: Thu, 13 Oct 2022 15:04:04 +0300	[thread overview]
Message-ID: <Y0f+tKCz+ZAIoroQ@dc75zzyyyyyyyyyyyyycy-3.rev.dnainternet.fi> (raw)

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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 =] 

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