*** empty log message ***

1 files changed, 65 insertions, 0 deletions

diff --git a/src/ring.h b/src/ring.h
new file mode 100644
index 0000000..d0dd3a0
--- /dev/null
+++ b/src/ring.h
@@ -0,0 +1,65 @@
+/*
+ * ring.h:
+ *
+ * Copyright (c) 2008 James McKenzie <james@fishsoup.dhs.org>,
+ * All rights reserved.
+ *
+ */
+
+/*
+ * $Id$
+ */
+
+/*
+ * $Log$
+ * Revision 1.1  2008/02/08 15:06:42  james
+ * *** empty log message ***
+ *
+ */
+
+#ifndef __RING_H__
+#define __RING_H__
+
+typedef struct {
+	uint8_t *ring;
+	int wptr;
+	int rptr;
+	int size;
+} Ring;
+
+#define RING_NEXT(r,a) (((a)+1) % ((r)->size))
+#define RING_NEXT_R(r) RING_NEXT(r,r->rptr)
+#define RING_NEXT_W(r) RING_NEXT(r,r->wptr)
+
+#define RING_EMPTY(r) (((r)->wptr) == ((r)->rptr))
+#define RING_FULL(r) (RING_NEXT_W(r) == ((r)->rptr))
+
+static inline int ring_write_one(Ring *r,uint8_t *c)
+{
+if (RING_FULL(r)) return 0;
+
+r->ring[r->wptr++]=*c;
+
+if (r->wptr==r->size)
+	r->wptr=0;
+}
+
+return 1;
+}
+
+static inline int ring_read_one(Ring *r,uint8_t *c)
+{
+if (RING_EMPTY(r)) return 0;
+
+*c=r->ring[r->rptr++];
+
+if (r->rptr==r->size)
+	r->rptr=0;
+}
+
+return 1;
+}
+
+
+
+#endif /* __RING_H__ */