From: Bastian Dehn <hhaalo@arcor.de>
Date: Sun, 24 Apr 2022 14:46:56 +0000 (+0200)
Subject: add: value counter
X-Git-Url: https://gitweb.hhaalo.de/?a=commitdiff_plain;h=8e58e0feb08ec02fbb47db8e3d494cc429d2502f;p=ringbuffer.git

add: value counter
---

diff --git a/ringbuffer.c b/ringbuffer.c
index fb94bc5..f9e8e1e 100644
--- a/ringbuffer.c
+++ b/ringbuffer.c
@@ -4,6 +4,7 @@
 
 void initRingbuffer(ringbuffer *buf, int size)
 {
+	buf->count = 0;
 	buf->tail = 0;
 	buf->head = 0;
 	buf->max = size;
@@ -18,21 +19,28 @@ void freeRingbuffer(ringbuffer *buf)
 
 void addValue(ringbuffer *buf, int value)
 {
+	if (buf->count >= buf->max)
+		buf->count = buf->max;
+
 	if (buf->head >= buf->max)
 		buf->head = 0;
 
 	buf->position[buf->head] = value;
 	buf->head++;
-
+	buf->count++;
 }
 
 int getValue(ringbuffer *buf)
 {
+	if (buf->count < 0)
+		return -1;
+
 	if (buf->tail >= buf->max)
 		buf->tail = 0;
 
 	int value = buf->position[buf->tail];
 	buf->tail++;
+	buf->count--;
 
 	return value;
 }
diff --git a/ringbuffer.h b/ringbuffer.h
index e79292c..f16e67b 100644
--- a/ringbuffer.h
+++ b/ringbuffer.h
@@ -2,6 +2,7 @@
 #define RINGBUFFER_H
 
 typedef struct {
+	int count;
 	int tail;
 	int head;
 	int max;