From 474c803c32fe055b4f09cb779f22b70d7eba8325 Mon Sep 17 00:00:00 2001
From: Miguel <m.i@gmx.at>
Date: Wed, 17 Oct 2018 02:39:56 +0200
Subject: screen areas invalidation

---
 kernel/ringbuffer.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

(limited to 'kernel/ringbuffer.c')

diff --git a/kernel/ringbuffer.c b/kernel/ringbuffer.c
index 3526f4d..f11e02b 100644
--- a/kernel/ringbuffer.c
+++ b/kernel/ringbuffer.c
@@ -1,14 +1,15 @@
 #include "ringbuffer.h"
 #include "kmalloc.h"
 #include "log.h"
+#include "asm_x86.h"
 
 ringbuffer ringbuffer_init(uint32_t size)
 {
     ringbuffer f;
     f.data=kballoc(size);
     f.size=size*4096;
-    f.front=f.size-1;
-    f.back=f.size-1;
+    f.front=0;
+    f.back=0;
     return f;
 }
 
@@ -19,14 +20,12 @@ void ringbuffer_free(ringbuffer *f)
 
 bool ringbuffer_full(ringbuffer* f)
 {
-    if((f->back-1+f->size)%f->size==f->front)return true;
-    return false;
+    return((f->back+1)%f->size==f->front);
 }
 
 bool ringbuffer_empty(ringbuffer* f)
 {
-    if(f->front==f->back)return true;
-    return false;
+    return(f->front==f->back);
 }
 
 bool ringbuffer_has(ringbuffer* f)
@@ -34,8 +33,6 @@ bool ringbuffer_has(ringbuffer* f)
     return !ringbuffer_empty(f);
 }
 
-//
-
 bool ringbuffer_put(ringbuffer* f,uint8_t c)
 {
     if(ringbuffer_full(f))
@@ -45,8 +42,7 @@ bool ringbuffer_put(ringbuffer* f,uint8_t c)
     }
 
     f->data[f->back]=c;
-    f->back--;
-    f->back+=f->size;
+    f->back++;
     f->back%=f->size;
 
     return true;
@@ -57,11 +53,8 @@ uint8_t ringbuffer_get(ringbuffer* f)
     if(ringbuffer_empty(f))return 0; // indistinguishable from value 0 :( // TODO
 
     uint8_t c = f->data[f->front];
-
-    f->front--;
-    f->front+=f->size;
+    f->front++;
     f->front%=f->size;
-
     return c;
 }
 
-- 
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