moving framebuffer access completely to userspace

1 files changed, 34 insertions, 24 deletions

diff --git a/kernel/ringbuffer.c b/kernel/ringbuffer.c
index 43d0e33..3886340 100644
--- a/kernel/ringbuffer.c
+++ b/kernel/ringbuffer.c
@@ -16,48 +16,58 @@ void ringbuffer_free(ringbuffer *f)
     kbfree(f->data);
 }
 
-bool ringbuffer_put(ringbuffer* f,uint8_t c)
+bool ringbuffer_full(ringbuffer* f)
 {
-    if(ringbuffer_full(f))return false;
-
-    f->data[f->back]=c;
-    f->back--;
-    f->back+=f->size;
-    f->back%=f->size;
-    return true;
+    if((f->back-1+f->size)%f->size==f->front)return true;
+    return false;
 }
 
-bool ringbuffer_full(ringbuffer* f)
+bool ringbuffer_empty(ringbuffer* f)
 {
-    if((f->back-1+f->size)%f->size==f->front)
-    {
-	return true;
-    }
+    if(f->front==f->back)return true;
     return false;
 }
 
 bool ringbuffer_has(ringbuffer* f)
 {
-    bool res=true;
+    return !ringbuffer_empty(f);
+}
+
+//
+
+bool ringbuffer_put(ringbuffer* f,uint8_t c)
+{
+    if(ringbuffer_full(f))return false;
+
+    f->data[f->back]=c;
+    f->back--;
+    f->back+=f->size;
+    f->back%=f->size;
 
-    if(f->front==f->back)
-	res=false;
-    return res;
+    return true;
 }
 
 uint8_t ringbuffer_get(ringbuffer* f)
 {
-    char c;
-
-    if(f->front==f->back)
-    {
-	return 0;
-    }
+    if(ringbuffer_empty(f))return 0; // indistinguishable from value 0 :( // TODO
 
-    c=f->data[f->front];
+    uint8_t c = f->data[f->front];
 
     f->front--;
     f->front+=f->size;
     f->front%=f->size;
+
     return c;
 }
+
+// TODO //
+
+uint32_t ringbuffer_write(ringbuffer* f, uint8_t *buf, uint32_t size)
+{
+    return 0;
+}
+
+uint32_t ringbuffer_read(ringbuffer* f, uint8_t *buf, uint32_t size)
+{
+    return 0;
+}