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Tue, 28 May 2019 07:39:46 +0000 Received: from NWD2HUBCAS7.ad.analog.com (nwd2hubcas7.ad.analog.com [10.64.69.107]) by nwd2mta1.analog.com (8.13.8/8.13.8) with ESMTP id x4S7dkpQ023241 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=OK); Tue, 28 May 2019 00:39:46 -0700 Received: from saturn.analog.com (10.50.1.244) by NWD2HUBCAS7.ad.analog.com (10.64.69.107) with Microsoft SMTP Server id 14.3.408.0; Tue, 28 May 2019 03:39:45 -0400 From: Alexandru Ardelean To: , , , , , , , , , , , , , , , , , , , , , , , , , , CC: , , , Alexandru Ardelean Subject: [PATCH 1/3][V2] lib: fix match_string() helper on -1 array size Date: Tue, 28 May 2019 10:39:30 +0300 Message-ID: <20190528073932.25365-1-alexandru.ardelean@analog.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190508112842.11654-1-alexandru.ardelean@analog.com> References: <20190508112842.11654-1-alexandru.ardelean@analog.com> MIME-Version: 1.0 X-ADIRoutedOnPrem: True X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:137.71.25.55;IPV:NLI;CTRY:US;EFV:NLI;SFV:NSPM;SFS:(10009020)(1496009)(376002)(396003)(39860400002)(136003)(346002)(2980300002)(54534003)(189003)(199004)(70586007)(70206006)(2441003)(8936002)(47776003)(7416002)(107886003)(316002)(2201001)(8676002)(14444005)(2906002)(2870700001)(86362001)(356004)(51416003)(6666004)(7696005)(26005)(305945005)(7636002)(1076003)(478600001)(36756003)(4326008)(110136005)(2616005)(126002)(44832011)(54906003)(76176011)(48376002)(486006)(476003)(106002)(50466002)(446003)(11346002)(186003)(50226002)(7406005)(426003)(336012)(53416004)(5660300002)(77096007)(246002)(921003)(1121003)(83996005)(2101003);DIR:OUT;SFP:1101;SCL:1;SRVR:BL2PR03MB545;H:nwd2mta1.analog.com;FPR:;SPF:Pass;LANG:en;PTR:nwd2mail10.analog.com;MX:1;A:1; X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 6c76f02a-34d6-47de-ba0c-08d6e33fa89e X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(5600148)(711020)(4605104)(4709054)(1401327)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328);SRVR:BL2PR03MB545; X-MS-TrafficTypeDiagnostic: BL2PR03MB545: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8273; X-Forefront-PRVS: 00514A2FE6 X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam-Message-Info: WYQoPPTo42AknDYSpY9w/xftF7FT7SRtXtbzi4SohjgnHD5P3hVPp3WTmUFaLfcDpBMThORg4NphooGNDC9igOh5UCY+z/qJehstorHN6dXF0JXfvmEyhD606e1CCgn1vUccxto/xRVdXdjRcRHavbu1mYcyAlmvTmEDKuQrxdfC1Vrm8H9/tkgoumu/npzY4P0Eyoj1Hwx3z5/P2OctimPreVyglKaTNX/j7lM7XosmVhLrWYt/TLXycti79mDqjngT5xwxZMvszzx4GLzrMAGI+oe486mPjGQdr4mkGPORfalJMEV5ae4/UIaivCRaqH3nuCzPeZes99dzedzF7DJd9vUvbhN8XxbI4NVjhC5LKkww2k/x2hqF8pFkOcddaQzB5rfbyVzu+jJvUQ8J9ZT6v/eq/Une//VX7JZ43bw= X-OriginatorOrg: analog.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 May 2019 07:39:46.9658 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6c76f02a-34d6-47de-ba0c-08d6e33fa89e X-MS-Exchange-CrossTenant-Id: eaa689b4-8f87-40e0-9c6f-7228de4d754a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=eaa689b4-8f87-40e0-9c6f-7228de4d754a;Ip=[137.71.25.55];Helo=[nwd2mta1.analog.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL2PR03MB545 Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The documentation the `_match_string()` helper mentions that `n` should be: * @n: number of strings in the array or -1 for NULL terminated arrays The behavior of the function is different, in the sense that it exits on the first NULL element in the array, regardless of whether `n` is -1 or a positive number. This patch changes the behavior, to exit the loop when a NULL element is found and n == -1. Essentially, this aligns the behavior with the doc-string. There are currently many users of `match_string()`, and so, in order to go through them, the next patches in the series will focus on doing some cosmetic changes, which are aimed at grouping the users of `match_string()`. Signed-off-by: Alexandru Ardelean --- Changelog v1 -> v2: * split the initial series into just 3 patches that fix the `match_string()` helper and start introducing a new version of this helper, which computes array-size of static arrays lib/string.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/lib/string.c b/lib/string.c index 6016eb3ac73d..e2cf5acc83bd 100644 --- a/lib/string.c +++ b/lib/string.c @@ -681,8 +681,11 @@ int match_string(const char * const *array, size_t n, const char *string) for (index = 0; index < n; index++) { item = array[index]; - if (!item) + if (!item) { + if (n != (size_t)-1) + continue; break; + } if (!strcmp(item, string)) return index; }