From 32db19a03c5a74c0bae40a0e83a730ec05c147be Mon Sep 17 00:00:00 2001
From: KAAAsS <admin@kaaass.net>
Date: Wed, 20 Apr 2022 23:22:24 +0800
Subject: [PATCH] =?UTF-8?q?shell=20=E6=94=AF=E6=8C=81=E9=80=80=E6=A0=BC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 lab5/user/lab5/apps/init.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/lab5/user/lab5/apps/init.c b/lab5/user/lab5/apps/init.c
index 947afd2..bcda0f5 100644
--- a/lab5/user/lab5/apps/init.c
+++ b/lab5/user/lab5/apps/init.c
@@ -54,15 +54,25 @@ char *readline(const char *prompt)
 		c = getch();
 		if (c < 0)
 			return NULL;
-        buf[complement_time++] = c;
-        printf("%c", c);
         if (c == '\r') {
+            // 回车
             usys_putc('\n');
             break;
+        } else if (c == '\b' || c == 127) {
+            // 退格
+            if (i > 0) {
+                i--;
+                usys_putc('\b');
+                usys_putc(' ');
+                usys_putc('\b');
+            }
+            continue;
+        } else {
+            usys_putc(c);
         }
+        buf[i++] = c;
 	}
-
-    buf[complement_time - 1] = '\0';
+    buf[i] = '\0';
 	return buf;
 }