From: Andy Shevchenko <andriy.shevche...@linux.intel.com>
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.shevche...@linux.intel.com>
Cc: "David S. Miller" <da...@davemloft.net>
Cc: Bartlomiej Zolnierkiewicz <b.zolnier...@samsung.com>
Cc: David Airlie <airl...@linux.ie>
Cc: David Woodhouse <dw...@infradead.org>
Cc: Dmitry Eremin-Solenikov <dbarysh...@gmail.com>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: Heikki Krogerus <heikki.kroge...@linux.intel.com>
Cc: Linus Walleij <linus.wall...@linaro.org>
Cc: Mika Westerberg <mika.westerb...@linux.intel.com>
Cc: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
Cc: Sebastian Reichel <s...@kernel.org>
Cc: Tejun Heo <t...@kernel.org>
Cc: Rasmus Villemoes <li...@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
(cherry picked from commit 56b060814e2d87d6646a85a2f4609c73587399ca)
Signed-off-by: Wan Ahmad Zainie <wan.ahmad.zainie.wan.moha...@intel.com>
---
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 e40099e..dbbdb65 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -125,6 +125,8 @@ 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 bb3d4b6..f056a51 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -542,6 +542,32 @@ 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
--
1.9.1
--
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