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[2001:14ba:16f3:4a00::4]) by smtp.gmail.com with ESMTPSA id 5-20020ac25f05000000b0049d83646ce7sm378761lfq.110.2022.10.13.05.04.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Oct 2022 05:04:24 -0700 (PDT) Date: Thu, 13 Oct 2022 15:04:04 +0300 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Jonathan Cameron , Lars-Peter Clausen , Hartmut Knaack , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] tools: iio: iio_utils: fix digit calculation Message-ID: MIME-Version: 1.0 Content-Disposition: inline X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1746574007171168200?= X-GMAIL-MSGID: =?utf-8?q?1746574007171168200?= 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 --- tools/iio/iio_utils.c | 4 ++++ 1 file changed, 4 insertions(+) base-commit: 4fe89d07dcc2804c8b562f6c7896a45643d34b2f 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++;