ply-buffer: Make ply_buffer_clear fast if called multiple times in a row

ply_buffer_clear memsets over the entire allocation every time it is
run.

This commit makes it only clear the used part of the allocation.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/libply/ply-buffer.c b/src/libply/ply-buffer.c
index af37cbc9..0fa68d8a 100644
--- a/src/libply/ply-buffer.c
+++ b/src/libply/ply-buffer.c
@@ -275,6 +275,9 @@ ply_buffer_get_size (ply_buffer_t *buffer)
 void
 ply_buffer_clear (ply_buffer_t *buffer)
 {
-        memset (buffer->data, '\0', buffer->capacity);
+        if (buffer->size == 0)
+                return;
+
+        memset (buffer->data, '\0', buffer->size);
         buffer->size = 0;
 }