From aa3dd7fd8f1b9409979af8263f06e45505326fc1 Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@gmx.de>
Date: Wed, 26 Sep 2012 15:48:57 +0200
Subject: [PATCH] libdraw: fix ^W corner case tick == 0 for enter()/eenter()

---
 sys/src/libdraw/eenter.c | 4 +++-
 sys/src/libdraw/enter.c  | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/sys/src/libdraw/eenter.c b/sys/src/libdraw/eenter.c
index a3c60a881..9102d60c3 100644
--- a/sys/src/libdraw/eenter.c
+++ b/sys/src/libdraw/eenter.c
@@ -152,10 +152,12 @@ eenter(char *ask, char *buf, int len, Mouse *m)
 			}
 			if(k == Ketb){
 				while(tick > 0){
-					buf[--tick] = 0;
+					tick--;
 					if(tick == 0 || strchr("\t ", buf[tick-1]))
 						break;
 				}
+				if(n > tick)
+					memset(buf+tick, 0, n-tick);
 				n = tick;
 				break;
 			}
diff --git a/sys/src/libdraw/enter.c b/sys/src/libdraw/enter.c
index a1a66cf6c..18fd4feec 100644
--- a/sys/src/libdraw/enter.c
+++ b/sys/src/libdraw/enter.c
@@ -160,10 +160,12 @@ enter(char *ask, char *buf, int len, Mousectl *mc, Keyboardctl *kc, Screen *scr)
 			}
 			if(k == Ketb){
 				while(tick > 0){
-					buf[--tick] = 0;
+					tick--;
 					if(tick == 0 || strchr("\t ", buf[tick-1]))
 						break;
 				}
+				if(n > tick)
+					memset(buf+tick, 0, n-tick);
 				n = tick;
 				break;
 			}