lib: introduce the yang_dnode_iterate helper

Implement helper function that iterates over data nodes that satisfy
XPath query.

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/lib/yang.c b/lib/yang.c
index c80bf20306..7ac39f4182 100644
--- a/lib/yang.c
+++ b/lib/yang.c
@@ -448,6 +448,32 @@ bool yang_dnode_exists(const struct lyd_node *dnode, const char *xpath_fmt, ...)
 	return found;
 }
 
+void yang_dnode_iterate(yang_dnode_iter_cb cb, void *arg,
+			const struct lyd_node *dnode, const char *xpath_fmt,
+			...)
+{
+	va_list ap;
+	char xpath[XPATH_MAXLEN];
+	struct ly_set *set;
+
+	va_start(ap, xpath_fmt);
+	vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
+	va_end(ap);
+
+	set = lyd_find_path(dnode, xpath);
+	assert(set);
+	for (unsigned int i = 0; i < set->number; i++) {
+		int ret;
+
+		dnode = set->set.d[i];
+		ret = (*cb)(dnode, arg);
+		if (ret == YANG_ITER_STOP)
+			return;
+	}
+
+	ly_set_free(set);
+}
+
 bool yang_dnode_is_default(const struct lyd_node *dnode, const char *xpath_fmt,
 			   ...)
 {