Add & document msg_capacity, msg_reserve (#1458)

* Add & document msg_capacity, msg_reserve

* reserve/capacity code style

* Documentation references to reserve/capacity

1 files changed, 12 insertions, 0 deletions

diff --git a/src/nng.c b/src/nng.c
index 3a3c3c5c..1ccc1386 100644
--- a/src/nng.c
+++ b/src/nng.c
@@ -1325,6 +1325,18 @@ nng_msg_free(nng_msg *msg)
 	nni_msg_free(msg);
 }
 
+int
+nng_msg_reserve(nng_msg *msg, size_t capacity)
+{
+	return (nni_msg_reserve(msg, capacity));
+}
+
+size_t
+nng_msg_capacity(nng_msg *msg)
+{
+	return (nni_msg_capacity(msg));
+}
+
 void *
 nng_msg_body(nng_msg *msg)
 {