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Ip=[137.71.25.55]; Helo=[nwd2mta1.analog.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL2PR03MB545 X-Mailman-Approved-At: Tue, 28 May 2019 17:03:57 +0200 Cc: gregkh@linuxfoundation.org, Alexandru Ardelean , heikki.krogerus@linux.intel.com, andriy.shevchenko@linux.intel.com Subject: [alsa-devel] [PATCH 1/3][V2] lib: fix match_string() helper on -1 array size X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" 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; }