2 files changed, 96 insertions, 1 deletions
diff --git a/lib/buffer/ringbuffer.c b/lib/buffer/ringbuffer.c
new file mode 100644
index 0000000..cdb5fed
--- /dev/null
+++ b/lib/buffer/ringbuffer.c
@@ -0,0 +1,96 @@
+// can handle one buffer for a start.
+// later make it reentrant and manage multiple buffers!
+// todo: syncing access to buffer.
+
+#define FOOLOS_MODULE_NAME "ringbuffer"
+#include "lib/bool/bool.h"
+#include "lib/logger/log.h"
+
+static volatile int front;
+static volatile int back;
+static volatile int size;
+
+#define RINGBUFFER_SIZE 10
+static volatile char buf[RINGBUFFER_SIZE];
+
+bool ringbuffer_selftest();
+
+void ringbuffer_init()
+{
+    size=RINGBUFFER_SIZE;
+    front=size-1;
+    back=size-1;
+
+//    ringbuffer_selftest();
+//    while(1);
+}
+
+bool ringbuffer_put(char c)
+{
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_FINE,"put wants lock)");
+    lock_spin(3);
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_FINE,"locked by put)");
+    if((back-1+size)%size==front)
+    {
+	lock_release(3);
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_FINE,"unlocked by put)");
+	return false;
+    }
+    buf[back]=c;
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_FINE,"put %d %d (%c)", back, front,c);
+    back--;
+    back+=size;
+    back%=size;
+    lock_release(3);
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_FINE,"unlocked by put)");
+    
+    return true;
+}
+
+bool ringbuffer_get(char *c)
+{
+
+
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_FINE,"get wants lock)");
+    lock_spin(3);
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_FINE,"locked by get)");
+    if(front==back)
+    {
+	lock_release(3);
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_FINE,"unlocked by get)");
+	return false;
+    }
+
+    *c=buf[front];
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_FINE,"get %d %d (%c)", back, front,*c);
+
+    front--;
+    front+=size;
+    front%=size;
+
+    lock_release(3);
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_FINE,"unlocked by get)");
+
+    return true;
+}
+
+bool ringbuffer_selftest()
+{
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"ringbuffer selftest");
+    char c;
+
+    ringbuffer_put('a');
+    ringbuffer_put('b');
+    ringbuffer_put('c');
+    ringbuffer_put('d');
+    ringbuffer_put('e');
+
+    ringbuffer_get(&c);
+    ringbuffer_get(&c);
+    ringbuffer_get(&c);
+    ringbuffer_get(&c);
+    ringbuffer_get(&c);
+    ringbuffer_get(&c);
+    ringbuffer_get(&c);
+
+}
diff --git a/lib/logger/log.c b/lib/logger/log.c
index 331726f..6d107f8 100644
--- a/lib/logger/log.c
+++ b/lib/logger/log.c
@@ -21,7 +21,6 @@ void log(char *module_name, int log_level, char *format_string, ...)
 
     if(log_level<FOOLOS_LOG_INFO)return;
 
-
     char buf_info[256];
     char buf_log[256];
     char buf_time[20];