From: Bastian Dehn <hhaalo@arcor.de>
Date: Sun, 24 Apr 2022 14:33:20 +0000 (+0200)
Subject: incomplete ringbuffer
X-Git-Url: https://gitweb.hhaalo.de/?a=commitdiff_plain;h=d8e57fdd3ea842af2e30d85325eb992c5610f645;p=ringbuffer.git

incomplete ringbuffer
---

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2eeaaa0..2accbcd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,4 +2,4 @@ cmake_minimum_required(VERSION 3.18.4)
 
 project(ringbuffer)
 
-add_executable(ringbuffer ringbuffer.c)
+add_executable(ringbuffer demo.c ringbuffer.c)
diff --git a/demo.c b/demo.c
new file mode 100644
index 0000000..5078cfd
--- /dev/null
+++ b/demo.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include "ringbuffer.h"
+
+#define maxvalues 52
+
+int main()
+{
+	ringbuffer buffer;
+
+	initRingbuffer(&buffer, 50);
+
+	for (int i = 0; i < maxvalues; i++) {
+		addValue(&buffer, i);
+	}
+
+	for (int i = 0; i < maxvalues; i++) {
+		printf("Value: %d\n", getValue(&buffer));
+	}
+
+	freeRingbuffer(&buffer);
+	return 0;	
+}
diff --git a/ringbuffer.c b/ringbuffer.c
index f6f42f2..fb94bc5 100644
--- a/ringbuffer.c
+++ b/ringbuffer.c
@@ -1,7 +1,38 @@
 #include <stdio.h>
+#include <stdlib.h>
+#include "ringbuffer.h"
 
-int main()
+void initRingbuffer(ringbuffer *buf, int size)
 {
-	printf("Hello World!\n");
-	return 0;	
+	buf->tail = 0;
+	buf->head = 0;
+	buf->max = size;
+	buf->position = malloc(sizeof(int) * size);
+}
+
+void freeRingbuffer(ringbuffer *buf)
+{
+	free(buf->position);
+	buf->position = NULL;
+}
+
+void addValue(ringbuffer *buf, int value)
+{
+	if (buf->head >= buf->max)
+		buf->head = 0;
+
+	buf->position[buf->head] = value;
+	buf->head++;
+
+}
+
+int getValue(ringbuffer *buf)
+{
+	if (buf->tail >= buf->max)
+		buf->tail = 0;
+
+	int value = buf->position[buf->tail];
+	buf->tail++;
+
+	return value;
 }
diff --git a/ringbuffer.h b/ringbuffer.h
new file mode 100644
index 0000000..e79292c
--- /dev/null
+++ b/ringbuffer.h
@@ -0,0 +1,16 @@
+#ifndef RINGBUFFER_H
+#define RINGBUFFER_H
+
+typedef struct {
+	int tail;
+	int head;
+	int max;
+	int *position;
+} ringbuffer;
+
+void initRingbuffer(ringbuffer *buf, int size);
+void freeRingbuffer(ringbuffer *buf);
+void addValue(ringbuffer *buf, int value);
+int getValue(ringbuffer *buf);
+
+#endif