From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Shevchenko Subject: [PATCH v4 1/9] lib/string: introduce match_string() helper Date: Thu, 28 Jan 2016 15:14:17 +0200 Message-ID: <1453986865-133572-2-git-send-email-andriy.shevchenko@linux.intel.com> References: <1453986865-133572-1-git-send-email-andriy.shevchenko@linux.intel.com> Return-path: In-Reply-To: <1453986865-133572-1-git-send-email-andriy.shevchenko@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org To: Tejun Heo , Linus Walleij , Dmitry Eremin-Solenikov , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, "David S . Miller" , David Airlie , Andrew Morton , Rasmus Villemoes Cc: Andy Shevchenko List-Id: linux-pm@vger.kernel.org >>From time to time we have to match a string in an array. Make a simple helper for that purpose. Signed-off-by: Andy Shevchenko --- include/linux/string.h | 2 ++ lib/string.c | 26 ++++++++++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/include/linux/string.h b/include/linux/string.h index b0a732b..07505aa 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -131,6 +131,8 @@ extern void argv_free(char **argv); extern bool sysfs_streq(const char *s1, const char *s2); extern int strtobool(const char *s, bool *res); +int match_string(const char * const *array, size_t n, const char *string); + #ifdef CONFIG_BINARY_PRINTF int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args); int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf); diff --git a/lib/string.c b/lib/string.c index 0323c0d..ba01d4f 100644 --- a/lib/string.c +++ b/lib/string.c @@ -631,6 +631,32 @@ bool sysfs_streq(const char *s1, const char *s2) EXPORT_SYMBOL(sysfs_streq); /** + * match_string - matches given string in an array + * @array: array of strings + * @n: number of strings in the array or -1 for NULL terminated arrays + * @string: string to match with + * + * Return: + * index of a @string in the @array if matches, or %-ENODATA otherwise. + */ +int match_string(const char * const *array, size_t n, const char *string) +{ + int index; + const char *item; + + for (index = 0; index < n; index++) { + item = array[index]; + if (!item) + break; + if (!strcmp(item, string)) + return index; + } + + return -ENODATA; +} +EXPORT_SYMBOL(match_string); + +/** * strtobool - convert common user inputs into boolean values * @s: input string * @res: result -- 2.7.0.rc3