From d19afb24c207c2324e93eb834439d468de7f0cdc Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Thu, 29 Oct 2015 00:16:50 -0400
Subject: tui_show_prompt(): Enforce range on cursor position

---
(limited to 'src/ui/tui.sh')

diff --git a/src/ui/tui.sh b/src/ui/tui.sh
index 962e731..74211d7 100644
--- a/src/ui/tui.sh
+++ b/src/ui/tui.sh
@@ -252,19 +252,25 @@ tui_show_prompt()
 			case "${key}" in
 				KEY_ENTER) break;;
 				KEY_BACKSPACE)
-					input="${input%?}"
-					curpos=$(($curpos - 1))
+					if [ ${curpos} -gt 0 ]; then
+						input="${input%?}"
+						curpos=$(($curpos - 1))
+					fi
 					;;
 				KEY_DEL)
 					;;
 				# TODO: Line editing
 				KEY_SPACE)
-					input="${input} "
-					curpos=$(($curpos + 1))
+					if [ ${curpos} -lt ${len} ]; then
+						input="${input} "
+						curpos=$(($curpos + 1))
+					fi
 					;;
 				*)
-					input="${input}${key}"
-					curpos=$(($curpos + 1))
+					if [ ${curpos} -lt ${len} ]; then
+						input="${input}${key}"
+						curpos=$(($curpos + 1))
+					fi
 					;;
 			esac
 		elif [ ${focus} -eq 1 ]; then
--
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