fix ring buffer

uttt.c

@@ -312,10 +312,10 @@ int ut_socket_buffer_size(struct ut_socket_buffer *sockbuf) {
 /* Copies up to (and including) first '\n' in socket buffer, otherwise whole buffer */
 int ut_readline_buffer(struct ut_socket_buffer *sockbuf, char *line, size_t len) {
 	int size = ut_socket_buffer_size(sockbuf);
-	for (int i = sockbuf->start; i < sockbuf->start + size; i++) {
-		if (i > len) {return -1;}
-		line[i] = sockbuf->buf[i % sockbuf->len];
-		if (sockbuf->buf[i] == '\n') {
+	for (int i = 0; i < size; i++) {
+		if (i > len) {return -2;}
+		line[i] = sockbuf->buf[(sockbuf->start + i) % sockbuf->len];
+		if (line[i] == '\n') {
 			sockbuf->start = (sockbuf->start + i + 1) % sockbuf->len;
 			return i + 1;
 		}
@@ -329,17 +329,17 @@ int ut_readline_socket(struct ut_socket_buffer *sockbuf, char *line, size_t len)
 		int r = read(sockbuf->fd, line, len);
 		if (r < 0) {
 			if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) {continue;}
-			else {return -2;}
+			else {return -1;}
 		}
-		else if (r == 0) {return -2;}
+		else if (r == 0) {return -1;}
 		for (int i = 0; i < r; i++) {
 			if (line[i] == '\n') {
 				int size = ut_socket_buffer_size(sockbuf);
-				if (r - i >= sockbuf->len - size) {return -1;}
-				for (int j = 0; j < r - i; j++) {
-					sockbuf->buf[(sockbuf->stop + j) % sockbuf->len] = line[i + j];
+				if (r - (i + 1) >= sockbuf->len - size) {return -2;}
+				for (int j = 0; j < r - (i + 1); j++) {
+					sockbuf->buf[(sockbuf->stop + j) % sockbuf->len] = line[i + 1 + j];
 				}
-				sockbuf->stop = (sockbuf->stop + r - i) % sockbuf->len;
+				sockbuf->stop = (sockbuf->stop + r - (i + 1)) % sockbuf->len;
 				return i;
 			}
 		}