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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2016-03-17 14:22:14 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-17 15:09:34 -0700
commit56b060814e2d87d6646a85a2f4609c73587399ca (patch)
treed1c5eae7bee90502b7da553356ec78017ebf2b9f
parent7475851f340f0c100773b554659bfea50026feda (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.h2
-rw-r--r--lib/string.c26
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