diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2016-03-17 14:22:14 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-17 15:09:34 -0700 |
| commit | 56b060814e2d87d6646a85a2f4609c73587399ca (patch) | |
| tree | d1c5eae7bee90502b7da553356ec78017ebf2b9f | |
| parent | 7475851f340f0c100773b554659bfea50026feda (diff) | |
lib/string: introduce match_string() helper
Occasionally we have to search for an occurrence of a string in an array
of strings. Make a simple helper for that purpose.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: David Airlie <airlied@linux.ie>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/string.h | 2 | ||||
| -rw-r--r-- | lib/string.c | 26 |
2 files changed, 28 insertions, 0 deletions
diff --git a/include/linux/string.h b/include/linux/string.h index 9eebc66d957a..0f235e80d355 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -130,6 +130,8 @@ 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 0323c0d5629a..e9c9db161d2c 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 %-EINVAL 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 -EINVAL; +} +EXPORT_SYMBOL(match_string); + +/** * strtobool - convert common user inputs into boolean values * @s: input string * @res: result |