[LEDE-DEV] [PATCH] ubus: Remove unnecessary memset calls.

[Rosen Penev]

Replace malloc+memset with calloc. Cleaner and faster in extreme situations.

Signed-off-by: Rosen Penev <rosenp at gmail.com>
---
 libubus.c  |  6 ++----
 lua/ubus.c | 18 ++++++------------
 2 files changed, 8 insertions(+), 16 deletions(-)

diff --git a/libubus.c b/libubus.c
index 9463522..260e40f 100644
--- a/libubus.c
+++ b/libubus.c
@@ -133,7 +133,7 @@ struct ubus_lookup_request {
 static void ubus_lookup_cb(struct ubus_request *ureq, int type, struct blob_attr *msg)
 {
 	struct ubus_lookup_request *req;
-	struct ubus_object_data obj;
+	struct ubus_object_data obj = {};
 	struct blob_attr **attr;
 
 	req = container_of(ureq, struct ubus_lookup_request, req);
@@ -143,7 +143,6 @@ static void ubus_lookup_cb(struct ubus_request *ureq, int type, struct blob_attr
 	    !attr[UBUS_ATTR_OBJTYPE])
 		return;
 
-	memset(&obj, 0, sizeof(obj));
 	obj.id = blob_get_u32(attr[UBUS_ATTR_OBJID]);
 	obj.path = blob_data(attr[UBUS_ATTR_OBJPATH]);
 	obj.type_id = blob_get_u32(attr[UBUS_ATTR_OBJTYPE]);
@@ -220,7 +219,7 @@ int ubus_register_event_handler(struct ubus_context *ctx,
 				const char *pattern)
 {
 	struct ubus_object *obj = &ev->obj;
-	struct blob_buf b2;
+	struct blob_buf b2 = {};
 	int ret;
 
 	if (!obj->id) {
@@ -236,7 +235,6 @@ int ubus_register_event_handler(struct ubus_context *ctx,
 	}
 
 	/* use a second buffer, ubus_invoke() overwrites the primary one */
-	memset(&b2, 0, sizeof(b2));
 	blob_buf_init(&b2, 0);
 	blobmsg_add_u32(&b2, "object", obj->id);
 	if (pattern)
diff --git a/lua/ubus.c b/lua/ubus.c
index 74a15b0..e9fd10e 100644
--- a/lua/ubus.c
+++ b/lua/ubus.c
@@ -410,11 +410,10 @@ static int ubus_lua_load_methods(lua_State *L, struct ubus_method *m)
 	}
 
 	/* setup the policy pointers */
-	p = malloc(sizeof(struct blobmsg_policy) * plen);
+	p = calloc(plen, sizeof(struct blobmsg_policy));
 	if (!p)
 		return 1;
 
-	memset(p, 0, sizeof(struct blobmsg_policy) * plen);
 	m->policy = p;
 	lua_pushnil(L);
 	while (lua_next(L, -2) != 0) {
@@ -481,26 +480,23 @@ static struct ubus_object* ubus_lua_load_object(lua_State *L)
 	int midx = 0;
 
 	/* setup object pointers */
-	obj = malloc(sizeof(struct ubus_lua_object));
+	obj = calloc(1, sizeof(struct ubus_lua_object));
 	if (!obj)
 		return NULL;
 
-	memset(obj, 0, sizeof(struct ubus_lua_object));
 	obj->o.name = lua_tostring(L, -2);
 
 	/* setup method pointers */
-	m = malloc(sizeof(struct ubus_method) * mlen);
-	memset(m, 0, sizeof(struct ubus_method) * mlen);
+	m = calloc(1, sizeof(struct ubus_method) * mlen);
 	obj->o.methods = m;
 
 	/* setup type pointers */
-	obj->o.type = malloc(sizeof(struct ubus_object_type));
+	obj->o.type = calloc(1, sizeof(struct ubus_object_type));
 	if (!obj->o.type) {
 		free(obj);
 		return NULL;
 	}
 
-	memset(obj->o.type, 0, sizeof(struct ubus_object_type));
 	obj->o.type->name = lua_tostring(L, -2);
 	obj->o.type->id = 0;
 	obj->o.type->methods = obj->o.methods;
@@ -715,11 +711,10 @@ ubus_lua_load_event(lua_State *L)
 {
 	struct ubus_lua_event* event = NULL;
 
-	event = malloc(sizeof(struct ubus_lua_event));
+	event = calloc(1, sizeof(struct ubus_lua_event));
 	if (!event)
 		return NULL;
 
-	memset(event, 0, sizeof(struct ubus_lua_event));
 	event->e.cb = ubus_event_handler;
 
 	/* update the he callback lookup table */
@@ -818,8 +813,7 @@ ubus_lua_do_subscribe( struct ubus_context *ctx, lua_State *L, const char* targe
 		lua_error( L );
 	}
 
-	sub = malloc( sizeof( struct ubus_lua_subscriber ) );
-	memset( sub, 0, sizeof( struct ubus_lua_subscriber ) );
+	sub = calloc( 1, sizeof( struct ubus_lua_subscriber ) );
 	if( !sub ){
 		lua_pushstring( L, "Out of memory" );
 		lua_error( L );
-- 
2.13.6