index: mmap: read child node

diff --git a/libkmod/libkmod-index.c b/libkmod/libkmod-index.c
index 8f35ecf..c21eec7 100644 (file)
--- a/libkmod/libkmod-index.c
+++ b/libkmod/libkmod-index.c
@@ -706,3 +706,14 @@ static struct index_mm_node *index_mm_readroot(struct index_mm *idx)
 {
        return index_mm_read_node(idx, idx->root_offset);
 }
+
+static struct index_mm_node *index_mm_readchild(const struct index_mm_node *parent,
+                                                                       int ch)
+{
+       if (parent->first <= ch && ch <= parent->last) {
+               return index_mm_read_node(parent->idx,
+                                       parent->children[ch - parent->first]);
+       }
+
+       return NULL;
+}