[PATCH] http: add_fill_function checks if function has been added

[Tay Ray Chuan <rctay89@gmail.com>]

This patch ensures that the same fill function is called once so to
prevent any possible issues.

Nevertheless, calling a fill function repeatedly in
''fill_active_slots'' will not lead to any obvious change in existing
behavior, though performance might be affected.

''add_fill_action'' checks if the function to be added has already been
added. Allocation of memory for the list ''fill_chain*'' is postponed
until the check passes, unlike previously.

Signed-off-by: Tay Ray Chuan <rctay89@gmail.com>
---
 http.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/http.c b/http.c
index ee58799..cdedeb6 100644
--- a/http.c
+++ b/http.c
@@ -408,13 +408,17 @@ static struct fill_chain *fill_cfg = NULL;

 void add_fill_function(void *data, int (*fill)(void *))
 {
-	struct fill_chain *new = xmalloc(sizeof(*new));
+	struct fill_chain *new;
 	struct fill_chain **linkp = &fill_cfg;
+	for (;*linkp; linkp = &(*linkp)->next)
+		if ((*linkp)->fill == fill)
+			return;
+
+	new = xmalloc(sizeof(*new));
 	new->data = data;
 	new->fill = fill;
 	new->next = NULL;
-	while (*linkp)
-		linkp = &(*linkp)->next;
+
 	*linkp = new;
 }

-- 
1.6.2.rc1