Commit 0fd16012 authored by Bartosz Golaszewski's avatar Bartosz Golaszewski
Browse files

lib: string_helpers: provide kfree_strarray() 



There's a common pattern of dynamically allocating an array of char
pointers and then also dynamically allocating each string in this
array. Provide a helper for freeing such a string array with one call.

Signed-off-by: default avatarBartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
parent 3795d7cc

include/linux/string_helpers.h

+2 −0
Original line number Diff line number Diff line
@@ -94,4 +94,6 @@ char *kstrdup_quotable(const char *src, gfp_t gfp); 
char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp);

char *kstrdup_quotable_file(struct file *file, gfp_t gfp);



void kfree_strarray(char **array, size_t n);



#endif

lib/string_helpers.c

+23 −0
Original line number Diff line number Diff line
@@ -649,3 +649,26 @@ char *kstrdup_quotable_file(struct file *file, gfp_t gfp) 
	return pathname;

}

EXPORT_SYMBOL_GPL(kstrdup_quotable_file);



/**

 * kfree_strarray - free a number of dynamically allocated strings contained

 *                  in an array and the array itself

 *

 * @array: Dynamically allocated array of strings to free.

 * @n: Number of strings (starting from the beginning of the array) to free.

 *

 * Passing a non-NULL @array and @n == 0 as well as NULL @array are valid

 * use-cases. If @array is NULL, the function does nothing.

 */

void kfree_strarray(char **array, size_t n)

{

	unsigned int i;



	if (!array)

		return;



	for (i = 0; i < n; i++)

		kfree(array[i]);

	kfree(array);

}

EXPORT_SYMBOL_GPL(kfree_strarray);