value_node: add combined find_or_add() and avoid duplicate names
diff --git a/value_node.c b/value_node.c
index 0713bf6..ef0167c 100644
--- a/value_node.c
+++ b/value_node.c
@@ -22,6 +22,7 @@
*/
#include <talloc.h>
+#include <string.h>
#include <osmocom/core/utils.h>
#include "value_node.h"
@@ -30,7 +31,15 @@
const char *name, const char *value)
{
struct value_node *vn = talloc_zero(parent, struct value_node);
+
+ if (parent && value_node_find(parent, name)) {
+ /* duplicate name not permitted! */
+ return NULL;
+ }
+
+ vn = talloc_zero(parent, struct value_node);
OSMO_ASSERT(vn);
+
/* we assume the name is static/const and owned by caller */
vn->name = name;
if (value)
@@ -43,6 +52,25 @@
return vn;
}
+struct value_node *value_node_find(struct value_node *parent, const char *name)
+{
+ struct value_node *vn;
+ llist_for_each_entry(vn, &parent->children, list) {
+ if (!strcmp(name, vn->name))
+ return vn;
+ }
+ return NULL;
+}
+
+struct value_node *value_node_find_or_add(struct value_node *parent, const char *name)
+{
+ struct value_node *vn;
+ vn = value_node_find(parent, name);
+ if (!vn)
+ vn = value_node_add(parent, parent, name, NULL);
+ return vn;
+}
+
void value_node_del(struct value_node *node)
{
/* remove ourselves from the parent */