From c17213b9500cfb26ba0d85b1a63c9aeb56981748 Mon Sep 17 00:00:00 2001
From: John Tsiombikas <nuclear@member.fsf.org>
Date: Mon, 25 Nov 2019 20:35:06 +0200
Subject: [PATCH] don't crash with no buffers, and clear the screen on exit

---
 libvisor/src/visor.c |    4 +++-
 visor/src/term.c     |    9 +++++++++
 visor/src/term.h     |    1 +
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/libvisor/src/visor.c b/libvisor/src/visor.c
index 2c93521..84ffd95 100644
--- a/libvisor/src/visor.c
+++ b/libvisor/src/visor.c
@@ -100,13 +100,15 @@ void vi_term_size(struct visor *vi, int xsz, int ysz)
 
 void vi_redraw(struct visor *vi)
 {
-	int i, col, cur_x = 0, cur_y = 0;
+	int i = 0, col, cur_x = 0, cur_y = 0;
 	char c;
 	struct vi_buffer *vb;
 	struct vi_span *sp, *spans_end;
 	const char *tptr, *tend;
 	vi_addr spoffs, addr;
 
+	if(!vi->buflist) goto end;
+
 	vb = vi->buflist;
 	if(!(sp = vi_buf_find_span(vb, vb->view_start, &spoffs))) {
 		sp = vb->spans;
diff --git a/visor/src/term.c b/visor/src/term.c
index af7d278..4746836 100644
--- a/visor/src/term.c
+++ b/visor/src/term.c
@@ -56,11 +56,20 @@ int term_init(const char *ttypath)
 
 void term_cleanup(void)
 {
+	term_clear();
+	term_setcursor(0, 0);
+	term_flush();
 	tcsetattr(ttyfd, TCSAFLUSH, &saved_term);
 	close(ttyfd);
 	ttyfd = -1;
 }
 
+void term_reset(void)
+{
+	term_puts("\033c");
+	term_flush();
+}
+
 void term_getsize(int *width, int *height)
 {
 	*width = term_width;
diff --git a/visor/src/term.h b/visor/src/term.h
index c1ce67d..fbf0558 100644
--- a/visor/src/term.h
+++ b/visor/src/term.h
@@ -36,6 +36,7 @@ union term_event {
 
 int term_init(const char *ttypath);
 void term_cleanup(void);
+void term_reset(void);
 
 void term_getsize(int *width, int *height);
 void term_resize_func(void (*func)(int, int));
-- 
1.7.10.4