libdm-config: Re-link config trees to reflect file order of keys/sections.

1 files changed, 20 insertions, 0 deletions

diff --git a/libdm/libdm-config.c b/libdm/libdm-config.c
index 4965e3229..c02638513 100644
--- a/libdm/libdm-config.c
+++ b/libdm/libdm-config.c
@@ -154,6 +154,24 @@ struct dm_config_tree *dm_config_insert_cascaded_tree(struct dm_config_tree *fir
 	return first_cft;
 }
 
+static struct dm_config_node *_config_reverse(struct dm_config_node *head)
+{
+	if (!head)
+		return NULL;
+
+	struct dm_config_node *left = head, *middle = NULL, *right = NULL;
+
+	do {
+		right = middle;
+		middle = left;
+		left = left->sib;
+		middle->sib = right;
+		middle->child = _config_reverse(middle->child);
+	} while (left);
+
+	return middle;
+};
+
 int dm_config_parse(struct dm_config_tree *cft, const char *start, const char *end)
 {
 	/* TODO? if (start == end) return 1; */
@@ -172,6 +190,8 @@ int dm_config_parse(struct dm_config_tree *cft, const char *start, const char *e
 	if (!(cft->root = _file(p)))
 		return_0;
 
+	cft->root = _config_reverse(cft->root);
+
 	return 1;
 }