# HG changeset patch
# User Matti Hamalainen <ccr@tnsp.org>
# Date 1225241511 -7200
# Node ID 0bcc38910a773fc4ce7922ae452e27ba78aacca7
# Parent  4e3616709752b9c0e73a9910da1595d92ab67a27
Simple ringbuffer implementation.

diff -r 4e3616709752 -r 0bcc38910a77 nnchat.c
--- a/nnchat.c	Wed Oct 29 02:51:35 2008 +0200
+++ b/nnchat.c	Wed Oct 29 02:51:51 2008 +0200
@@ -19,12 +19,15 @@
 #include <time.h>
 #include <ncurses.h>
 
+
+#define SET_MAX_BACKBUF (1024)
 #define SET_MAX_HISTORY (16)
 #define SET_BUFSIZE     (4096)
 #define SET_ALLOC_SIZE	(128)
 #define SET_DELAY       (15)
 #define SET_DELAY_USEC  (SET_DELAY * 1000)
 
+
 /* Options
  */
 int     optPort = 8005;
@@ -152,6 +155,50 @@
 	return TRUE;
 }
 
+
+typedef struct {
+	char **data;
+	size_t n, size;
+} ringbuf_t;
+
+
+ringbuf_t * newRingBuf(const size_t size)
+{
+	ringbuf_t *res = th_calloc(1, sizeof(ringbuf_t));
+	
+	res->data = (char **) th_malloc(size * sizeof(char *));
+	res->size = size;
+	res->n = 0;
+	
+	return res;
+}
+
+
+void freeRingBuf(ringbuf_t *buf)
+{
+	size_t i;
+	
+	for (i = 0; i < buf->n; i++)
+		th_free(buf->data[i]);
+	
+	th_free(buf->data);
+	th_free(buf);
+}
+
+
+void addRingBuf(ringbuf_t *buf, const char *str)
+{
+	if (buf->n < buf->size) {
+		buf->data[buf->n] = th_strdup(str);
+		buf->n++;
+	} else {
+		th_free(buf->data[0]);
+		memmove(&(buf->data[0]), &(buf->data[1]), buf->size - 1);
+		buf->data[buf->size - 1] = th_strdup(str);
+	}
+}
+
+
 typedef struct {
 	ssize_t pos, len, size;
 	char *data;