lib: add and use new yang function for finding schema nodes

Add a wrapper around lys_find_xpath which has an unfortunate API
returning an allocated set of schema nodes when we only ever expect and
want one.

Another libyang function `lys_find_path` returns a single node; however,
that function can assert/abort on invalid path values so is unsuitable
for user input.

Replace previous uses of `lys_find_path` with new API when dealing with
possible invalid path values (i.e., from a user).

Signed-off-by: Christian Hopps <chopps@labn.net>

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/yang.c b/lib/yang.c
index 70a3251ab..4dd865421 100644
--- a/lib/yang.c
+++ b/lib/yang.c
@@ -250,6 +250,23 @@ void yang_snode_get_path(const struct lysc_node *snode,
 	}
 }
 
+struct lysc_node *yang_find_snode(struct ly_ctx *ly_ctx, const char *xpath,
+				  uint32_t options)
+{
+	struct lysc_node *snode;
+	struct ly_set *set;
+	LY_ERR err;
+
+	err = lys_find_xpath(ly_native_ctx, NULL, xpath, options, &set);
+	if (err || !set->count)
+		return NULL;
+
+	snode = set->snodes[0];
+	ly_set_free(set, NULL);
+
+	return snode;
+}
+
 struct lysc_node *yang_snode_real_parent(const struct lysc_node *snode)
 {
 	struct lysc_node *parent = snode->parent;