buffer: implement buffer_capacity utility function

1 files changed, 2 insertions, 0 deletions

diff --git a/buffer.h b/buffer.h
index 6c6bc82..91932c6 100644
--- a/buffer.h
+++ b/buffer.h
@@ -50,6 +50,8 @@ bool buffer_appendf(Buffer*, const char *fmt, ...);
 size_t buffer_length0(Buffer*);
 /* return length of a buffer including possible NUL byte */
 size_t buffer_length(Buffer*);
+/* return current maximal capacity in bytes of this buffer */
+size_t buffer_capacity(Buffer*);
 /* pointer to buffer data, guaranteed to return a NUL terminated
  * string even if buffer is empty */
 const char *buffer_content0(Buffer*);