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

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
......@@ -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
......@@ -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);
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