add blobmsg list helpers

[project/procd.git] / utils.c

diff --git a/utils.c b/utils.c
new file mode 100644 (file)
index 0000000..cff67bd
--- /dev/null
+++ b/utils.c
@@ -0,0 +1,55 @@
+#include <libubox/avl.h>
+#include <libubox/avl-cmp.h>
+#include "utils.h"
+
+void
+__blobmsg_list_init(struct blobmsg_list *list, int offset, int len)
+{
+       avl_init(&list->avl, avl_strcmp, false, NULL);
+       list->node_offset = offset;
+       list->node_len = len;
+}
+
+int
+blobmsg_list_fill(struct blobmsg_list *list, void *data, int len)
+{
+       struct avl_tree *tree = &list->avl;
+       struct blobmsg_list_node *node;
+       struct blob_attr *cur;
+       void *ptr;
+       int count = 0;
+       int rem = len;
+
+       __blob_for_each_attr(cur, data, rem) {
+               if (!blobmsg_check_attr(cur, true))
+                       continue;
+
+               ptr = calloc(1, list->node_len);
+               if (!ptr)
+                       return -1;
+
+               node = (void *) ((char *)ptr + list->node_offset);
+               node->avl.key = blobmsg_name(cur);
+               node->data = cur;
+               if (avl_insert(tree, &node->avl)) {
+                       free(ptr);
+                       continue;
+               }
+
+               count++;
+       }
+
+       return count;
+}
+
+void
+blobmsg_list_free(struct blobmsg_list *list)
+{
+       struct blobmsg_list_node *node, *tmp;
+       void *ptr;
+
+       avl_remove_all_elements(&list->avl, node, avl, tmp) {
+               ptr = ((char *) node - list->node_offset);
+               free(ptr);
+       }
+}