[PATCH 09/11] reduce casts to RedPipeItem and RingItem

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Make code more type safe. This allow to move or delete structure
fields more safely

Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
 server/dcc.c       | 6 +++---
 server/reds.c      | 2 +-
 server/smartcard.c | 4 ++--
 server/spicevmc.c  | 5 ++---
 server/stream.c    | 2 +-
 5 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/server/dcc.c b/server/dcc.c
index 33357cd..20a8f11 100644
--- a/server/dcc.c
+++ b/server/dcc.c
@@ -78,7 +78,7 @@ int dcc_clear_surface_drawables_from_pipe(DisplayChannelClient *dcc, int surface
     rcc = RED_CHANNEL_CLIENT(dcc);
     ring = &rcc->pipe;
     item = (RedPipeItem *) ring;
-    while ((item = (RedPipeItem *)ring_next(ring, (RingItem *)item))) {
+    while ((item = (RedPipeItem *)ring_next(ring, &item->link))) {
         Drawable *drawable;
         RedDrawablePipeItem *dpi = NULL;
         int depend_found = FALSE;
@@ -94,7 +94,7 @@ int dcc_clear_surface_drawables_from_pipe(DisplayChannelClient *dcc, int surface
 
         if (drawable->surface_id == surface_id) {
             RedPipeItem *tmp_item = item;
-            item = (RedPipeItem *)ring_prev(ring, (RingItem *)item);
+            item = (RedPipeItem *)ring_prev(ring, &item->link);
             red_channel_client_pipe_remove_and_release(rcc, tmp_item);
             if (!item) {
                 item = (RedPipeItem *)ring;
@@ -514,7 +514,7 @@ void dcc_stream_agent_clip(DisplayChannelClient* dcc, StreamAgent *agent)
     item->rects->num_rects = n_rects;
     region_ret_rects(&agent->clip, item->rects->rects, n_rects);
 
-    red_channel_client_pipe_add(RED_CHANNEL_CLIENT(dcc), (RedPipeItem *)item);
+    red_channel_client_pipe_add(RED_CHANNEL_CLIENT(dcc), &item->base);
 }
 
 static void red_monitors_config_item_free(RedPipeItem *base)
diff --git a/server/reds.c b/server/reds.c
index fa9a79e..90911b4 100644
--- a/server/reds.c
+++ b/server/reds.c
@@ -888,7 +888,7 @@ static RedPipeItem *vdi_port_read_one_msg_from_device(SpiceCharDeviceInstance *s
                 dev->priv->read_state = VDI_PORT_READ_STATE_GET_BUFF;
             }
             if (vdi_port_read_buf_process(reds->agent_dev, dispatch_buf, &error)) {
-                return (RedPipeItem *)dispatch_buf;
+                return &dispatch_buf->base;
             } else {
                 if (error) {
                     reds_agent_remove(reds);
diff --git a/server/smartcard.c b/server/smartcard.c
index 2acddcf..9280038 100644
--- a/server/smartcard.c
+++ b/server/smartcard.c
@@ -160,7 +160,7 @@ static RedPipeItem *smartcard_read_msg_from_device(SpiceCharDeviceInstance *sin,
         dev->priv->buf_pos = dev->priv->buf;
         dev->priv->buf_used = remaining;
         if (msg_to_client) {
-            return (RedPipeItem *)msg_to_client;
+            return &msg_to_client->base;
         }
     }
     return NULL;
@@ -172,7 +172,7 @@ static void smartcard_send_msg_to_client(RedPipeItem *msg,
 {
     RedCharDeviceSmartcard *dev = opaque;
     spice_assert(dev->priv->scc && dev->priv->scc->base.client == client);
-    smartcard_channel_client_pipe_add_push(&dev->priv->scc->base, (RedPipeItem *)msg);
+    smartcard_channel_client_pipe_add_push(&dev->priv->scc->base, msg);
 
 }
 
diff --git a/server/spicevmc.c b/server/spicevmc.c
index f46b9e5..54c4f42 100644
--- a/server/spicevmc.c
+++ b/server/spicevmc.c
@@ -133,7 +133,7 @@ static RedPipeItem *spicevmc_chardev_read_msg_from_dev(SpiceCharDeviceInstance *
     if (n > 0) {
         spice_debug("read from dev %d", n);
         msg_item->buf_used = n;
-        return (RedPipeItem *)msg_item;
+        return &msg_item->base;
     } else {
         state->pipe_item = msg_item;
         return NULL;
@@ -145,11 +145,10 @@ static void spicevmc_chardev_send_msg_to_client(RedPipeItem *msg,
                                                 void *opaque)
 {
     SpiceVmcState *state = opaque;
-    RedVmcPipeItem *vmc_msg = SPICE_CONTAINEROF(msg, RedVmcPipeItem, base);
 
     spice_assert(state->rcc->client == client);
     red_pipe_item_ref(msg);
-    red_channel_client_pipe_add_push(state->rcc, (RedPipeItem *)vmc_msg);
+    red_channel_client_pipe_add_push(state->rcc, msg);
 }
 
 static SpiceVmcState *spicevmc_red_channel_client_get_state(RedChannelClient *rcc)
diff --git a/server/stream.c b/server/stream.c
index 74df254..be92289 100644
--- a/server/stream.c
+++ b/server/stream.c
@@ -177,7 +177,7 @@ void red_stream_clip_item_free(RedPipeItem *base)
 RedStreamClipItem *red_stream_clip_item_new(StreamAgent *agent)
 {
     RedStreamClipItem *item = spice_new(RedStreamClipItem, 1);
-    red_pipe_item_init_full((RedPipeItem *)item, RED_PIPE_ITEM_TYPE_STREAM_CLIP,
+    red_pipe_item_init_full(&item->base, RED_PIPE_ITEM_TYPE_STREAM_CLIP,
                             red_stream_clip_item_free);
 
     item->stream_agent = agent;
-- 
2.7.4

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