From: Ben Pfaff <blp@nicira.com>
Date: Mon, 14 Jul 2008 20:51:26 +0000 (-0700)
Subject: buffer: Make buffer_pull() return the start of the pulled data.
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d6ea83302af4676df036d3c7e52f680dd84cf9a6;p=openvswitch

buffer: Make buffer_pull() return the start of the pulled data.

Some callers find this useful.
---

diff --git a/include/buffer.h b/include/buffer.h
index 0d024ec9..c2cbb139 100644
--- a/include/buffer.h
+++ b/include/buffer.h
@@ -76,6 +76,6 @@ size_t buffer_tailroom(struct buffer *);
 void buffer_reserve_tailroom(struct buffer *, size_t);
 
 void buffer_clear(struct buffer *);
-void buffer_pull(struct buffer *, size_t);
+void *buffer_pull(struct buffer *, size_t);
 
 #endif /* buffer.h */
diff --git a/lib/buffer.c b/lib/buffer.c
index 2b6e3b78..dc9887a9 100644
--- a/lib/buffer.c
+++ b/lib/buffer.c
@@ -231,12 +231,14 @@ buffer_clear(struct buffer *b)
 }
 
 /* Removes 'size' bytes from the head end of 'b', which must contain at least
- * 'size' bytes of data. */
-void
+ * 'size' bytes of data.  Returns the first byte of data removed. */
+void *
 buffer_pull(struct buffer *b, size_t size) 
 {
+    void *data = b->data;
     assert(b->size >= size);
     b->data += size;
     b->size -= size;
+    return data;
 }