shared/ring: rename ring_size to ring_used, add ring_avail

1 files changed, 5 insertions, 1 deletions

diff --git a/src/shared/container/ring.c b/src/shared/container/ring.c
index 67944b0..21c63a1 100644
--- a/src/shared/container/ring.c
+++ b/src/shared/container/ring.c
@@ -7,13 +7,17 @@ static bool at_end(ring_t *r) {
 		|| (r->_head + 1 == r->capacity && r->_tail == 0);
 }
 
-size_t ring_size(ring_t *r) {
+size_t ring_used(ring_t *r) {
 	if (r->_head >= r->_tail)
 		return r->_head - r->_tail;
 	else
 		return r->_head + r->capacity - r->_tail;
 }
 
+size_t ring_avail(ring_t *r) {
+	return r->capacity - ring_used(r);
+}
+
 void ring_put(ring_t *r, void *buf, size_t len) {
 	// TODO do something similar to ring_get
 	for (size_t i = 0; i < len; i++)