ringbuf: get_{write,read}_vector returns total bytes in both vec elts

This will eliminate unnecessary calls to ringbuf_{read,write}_space

git-svn-id: https://svn.musicpd.org/mpd/trunk@7389 09075e82-0dd4-0310-85a5-a0d7c8717e4f

1 files changed, 5 insertions, 2 deletions

diff --git a/src/ringbuf.h b/src/ringbuf.h
index dc3509363..1465e8fa2 100644
--- a/src/ringbuf.h
+++ b/src/ringbuf.h
@@ -85,8 +85,9 @@ void ringbuf_free(struct ringbuf * rb);
  * @param rb a pointer to the ringbuffer structure.
  * @param vec a pointer to a 2 element array of struct iovec.
  *
+ * @return total number of bytes readable into both vec elements
  */
-void ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec);
+size_t ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec);
 
 /**
  * Fill a data structure with a description of the current writable
@@ -106,8 +107,10 @@ void ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec);
  *
  * @param rb a pointer to the ringbuffer structure.
  * @param vec a pointer to a 2 element array of struct iovec.
+ *
+ * @return total number of bytes writable in both vec elements
  */
-void ringbuf_get_write_vector(const struct ringbuf * rb, struct iovec * vec);
+size_t ringbuf_get_write_vector(const struct ringbuf * rb, struct iovec * vec);
 
 /**
  * Read data from the ringbuffer.