Created circular buffer

1 files changed, 191 insertions, 0 deletions

diff --git a/buf_misc.c b/buf_misc.c
new file mode 100644
index 0000000..938e8a3
--- /dev/null
+++ b/buf_misc.c
@@ -0,0 +1,191 @@
+#include "buf_misc.h"
+
+int bbuf_line_new(bbuf_line *buf, char sep, int size)
+{
+	bbuf *newbuf=NULL;
+	bbuf_line *bline=NULL;
+
+	newbuf = bbuf_new(size);
+	if (newbuf == NULL)
+	{
+
+		return -1;
+	}
+
+	bline = malloc(sizeof(bbuf_line));
+	if (bline == NULL)
+	{
+		return -1;
+	}
+
+	memset(bline, 0, sizeof(bbuf_line));
+	bline->sep = 0x0;
+
+	bline->buf = newbuf;
+
+	buf = bline;
+
+	return 0;
+}
+
+
+int bbuf_line_add(bbuf_line *buf_line, bbuf *new_data)
+{
+
+	return -1;
+}
+
+
+int bbuf_line_get_line(bbuf_line *buf_line, bbuf *line)
+{
+
+	return -1;
+}
+
+
+int bbuf_line_free(bbuf_line *buf)
+{
+
+	return -1;
+}
+
+int bbuf_circ_new(bbuf_circ **circ, int size)
+{
+	bbuf *buf = NULL;
+	bbuf_circ *cbuf = NULL;
+
+	buf = bbuf_new(size);
+	if (buf == NULL)
+	{
+		return -1;
+	}
+
+	cbuf = malloc(sizeof(bbuf_circ));
+	if (cbuf == NULL)
+	{
+		return -1;
+	}
+
+	cbuf->buf = buf;
+	cbuf->head = 0;
+	cbuf->tail = 0;
+
+	*circ = cbuf;
+
+	return 0;
+}
+
+int bbuf_circ_add(bbuf_circ *circ, bbuf *new_data)
+{
+	int i=0;
+	int cnt=0;
+
+	if (circ == NULL)
+	{
+		return -1;
+	}
+
+	if (new_data == NULL)
+	{
+		return -1;
+	}
+
+	if (bbuf_size(new_data) <= 0)
+	{
+		return -1;
+	}
+
+	for (i=0;i<bbuf_size(new_data);i++)
+	{
+		if (0 == bbuf_circ_put(circ, new_data->buf[i]))
+		{
+			cnt++;
+		}
+	}
+
+	return cnt;
+}
+
+int bbuf_circ_get_line(bbuf_circ *circ, bbuf *line)
+{
+
+}
+
+int bbuf_circ_reset(bbuf_circ *circ)
+{
+	if (circ == NULL)
+	{
+		return -1;
+	}
+
+	circ->head = 0;
+	circ->tail = 0;
+
+	return 0;
+}
+
+
+int bbuf_circ_get(bbuf_circ *circ, char *data)
+{
+	if (circ == NULL)
+	{
+		return -1;
+	}
+
+	if (data == NULL)
+	{
+		return -1;
+	}
+
+	if (0 == bbuf_circ_empty(circ))
+	{
+		*data = circ->buf->buf[circ->tail];
+		circ->tail = (circ->tail+1)%bbuf_size(circ->buf);
+		return 0;
+	}
+
+	return -1;
+}
+
+int bbuf_circ_put(bbuf_circ *circ, char data)
+{
+	if (NULL == circ)
+	{
+		return -1;
+	}
+
+	circ->buf->buf[circ->head] = data;
+	circ->head = (circ->head+1)%bbuf_size(circ->buf);
+
+	if (circ->head == circ->tail)
+	{
+		circ->tail = (circ->tail+1)%bbuf_size(circ->buf);
+	}
+
+	return 0;
+}
+
+int bbuf_circ_empty(bbuf_circ *circ)
+{
+	if (circ == NULL)
+	{
+		return -1;
+	}
+
+	return (circ->tail == circ->head);
+}
+
+int bbuf_circ_full(bbuf_circ *circ)
+{
+	//one lost byte
+	return ((circ->head+1)%bbuf_size(circ->buf) == (circ->tail));
+}
+
+int bbuf_circ_free(bbuf_circ *circ)
+{
+	bbuf_free(circ->buf);
+	circ->buf = NULL;
+	free(circ);
+	circ = NULL;
+}
+