From 58fc840b8325395d24ab70e84cb69880c6daa9ee Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 28 Mar 2011 23:27:04 +0200
Subject: [PATCH] ask-password: use TAB instead of backspace to disable
 asterisk password echo

---
 src/ask-password-api.c | 44 +++++++++++++++++++++++++++++-------------
 1 file changed, 31 insertions(+), 13 deletions(-)

diff --git a/src/ask-password-api.c b/src/ask-password-api.c
index 022f1cae8..cb0559065 100644
--- a/src/ask-password-api.c
+++ b/src/ask-password-api.c
@@ -36,6 +36,18 @@
 
 #include "ask-password-api.h"
 
+static void backspace_chars(int ttyfd, size_t p) {
+
+        if (ttyfd < 0)
+                return;
+
+        while (p > 0) {
+                p--;
+
+                loop_write(ttyfd, "\b \b", 3, false);
+        }
+}
+
 int ask_password_tty(
                 const char *message,
                 usec_t until,
@@ -156,24 +168,30 @@ int ask_password_tty(
 
                 if (c == '\n')
                         break;
-                else if (c == 21) {
-                        while (p > 0) {
-                                p--;
+                else if (c == 21) { /* C-u */
 
-                                if (ttyfd >= 0)
-                                        loop_write(ttyfd, "\b \b", 3, false);
-                        }
+                        if (!silent_mode)
+                                backspace_chars(ttyfd, p);
+                        p = 0;
 
                 } else if (c == '\b' || c == 127) {
-                        if (p == 0 && !silent_mode) {
-                                silent_mode = true;
-                                loop_write(ttyfd, "(no echo) ", 10, false);
-                        } else if (p > 0) {
+
+                        if (p > 0) {
+
+                                if (!silent_mode)
+                                        backspace_chars(ttyfd, 1);
+
                                 p--;
+                        } else if (ttyfd >= 0)
+                                loop_write(ttyfd, "\a", 1, false);
 
-                                if (ttyfd >= 0)
-                                        loop_write(ttyfd, "\b \b", 3, false);
-                        }
+                } else if (c == '\t' && !silent_mode) {
+
+                        backspace_chars(ttyfd, p);
+                        silent_mode = true;
+
+                        if (ttyfd >= 0)
+                                loop_write(ttyfd, "(no echo) ", 10, false);
                 } else {
                         passphrase[p++] = c;
 
-- 
2.30.2