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lib/string_helpers: Introduce managed variant of kasprintf_strarray()

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Some of the users want to have easy way to allocate array of strings
that will be automatically cleaned when associated device is gone.

Introduce managed variant of kasprintf_strarray() for such use cases.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Andy Shevchenko 2021-11-05 14:42:25 +02:00
parent 418e0a3551
commit acdb89b6c8
2 changed files with 34 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

3
include/linux/string_helpers.h
View file

@ -7,6 +7,7 @@
#include <linux/string.h>
#include <linux/types.h>
struct device;
struct file;
struct task_struct;
@ -103,4 +104,6 @@ char *kstrdup_quotable_file(struct file *file, gfp_t gfp);
char **kasprintf_strarray(gfp_t gfp, const char *prefix, size_t n);
void kfree_strarray(char **array, size_t n);
char **devm_kasprintf_strarray(struct device *dev, const char *prefix, size_t n);
#endif

31
lib/string_helpers.c
View file

@ -10,6 +10,7 @@
#include <linux/math64.h>
#include <linux/export.h>
#include <linux/ctype.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/limits.h>
@ -730,6 +731,36 @@ void kfree_strarray(char **array, size_t n)
}
EXPORT_SYMBOL_GPL(kfree_strarray);
struct strarray {
char **array;
size_t n;
};
static void devm_kfree_strarray(struct device *dev, void *res)
{
struct strarray *array = res;
kfree_strarray(array->array, array->n);
}
char **devm_kasprintf_strarray(struct device *dev, const char *prefix, size_t n)
{
struct strarray *ptr;
ptr = devres_alloc(devm_kfree_strarray, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
ptr->array = kasprintf_strarray(GFP_KERNEL, prefix, n);
if (!ptr->array) {
devres_free(ptr);
return ERR_PTR(-ENOMEM);
}
return ptr->array;
}
EXPORT_SYMBOL_GPL(devm_kasprintf_strarray);
/**
* strscpy_pad() - Copy a C-string into a sized buffer
* @dest: Where to copy the string to