lib: update from upstream

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/cbuf.h b/lib/cbuf.h
index 83975db..df55f1a 100644
--- a/lib/cbuf.h
+++ b/lib/cbuf.h
@@ -70,6 +70,12 @@ cbuf_size(const struct cbuf *cbuf)
     return cbuf->end - cbuf->start;
 }
 
+static inline size_t
+cbuf_avail_size(const struct cbuf *cbuf)
+{
+    return cbuf_capacity(cbuf) - cbuf_size(cbuf);
+}
+
 static inline void
 cbuf_clear(struct cbuf *cbuf)
 {