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-rw-r--r--lib/string_helpers.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index d5d008f5b1d9..90f9f1b7afec 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -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>
@@ -675,6 +676,39 @@ char *kstrdup_quotable_file(struct file *file, gfp_t gfp)
EXPORT_SYMBOL_GPL(kstrdup_quotable_file);
/**
+ * kasprintf_strarray - allocate and fill array of sequential strings
+ * @gfp: flags for the slab allocator
+ * @prefix: prefix to be used
+ * @n: amount of lines to be allocated and filled
+ *
+ * Allocates and fills @n strings using pattern "%s-%zu", where prefix
+ * is provided by caller. The caller is responsible to free them with
+ * kfree_strarray() after use.
+ *
+ * Returns array of strings or NULL when memory can't be allocated.
+ */
+char **kasprintf_strarray(gfp_t gfp, const char *prefix, size_t n)
+{
+ char **names;
+ size_t i;
+
+ names = kcalloc(n + 1, sizeof(char *), gfp);
+ if (!names)
+ return NULL;
+
+ for (i = 0; i < n; i++) {
+ names[i] = kasprintf(gfp, "%s-%zu", prefix, i);
+ if (!names[i]) {
+ kfree_strarray(names, i);
+ return NULL;
+ }
+ }
+
+ return names;
+}
+EXPORT_SYMBOL_GPL(kasprintf_strarray);
+
+/**
* kfree_strarray - free a number of dynamically allocated strings contained
* in an array and the array itself
*
@@ -697,6 +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