1 files changed, 72 insertions, 0 deletions

diff --git a/ringbuff.c b/ringbuff.c
new file mode 100644
index 0000000..99dc0d8
--- /dev/null
+++ b/ringbuff.c
@@ -0,0 +1,72 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include "util.h"
+
+typedef int T;
+
+struct ring_buffer {
+        int head, tail;
+        T array[8];     /* fit for your needs... */
+};
+
+void
+ring_init(struct ring_buffer *rb)
+{
+        rb->head = rb->tail = 0;
+}
+
+bool
+ring_put(struct ring_buffer *rb, T data)
+{
+        const int next = (rb->head + 1) % NELEM(rb->array);
+
+        if ( next == rb->tail )
+                return false;
+
+        rb->array[rb->head] = data;
+        rb->head = next;
+
+        return true;
+}
+
+bool
+ring_get(struct ring_buffer *rb, T *data)
+{
+        if ( rb->head == rb->tail )
+                return false;
+
+        const int next = (rb->tail + 1) % NELEM(rb->array);
+
+        *data = rb->array[rb->tail];
+        rb->tail = next;
+
+        return true;
+}
+
+void f() { ERROR(""); }
+
+int
+main(void)
+{
+#if 0
+        struct ring_buffer rb;
+        ring_init(&rb);
+#else
+        struct ring_buffer rb = { .head = 0, .tail = 0 };
+#endif
+
+        for ( int i = 0; i != 30; ++i ) {
+                if ( !ring_put(&rb, i) )
+                        break;
+        }
+
+        int j;
+        while ( ring_get(&rb, &j) ) {
+                printf("%d\n", j);
+        }
+
+        return EXIT_SUCCESS;
+}
+
+