From 1422499f1e467d7e17897bf220087bec44b3d7bc Mon Sep 17 00:00:00 2001
From: Ali Gholami Rudi <ali@rudi.ir>
Date: Sun, 4 Nov 2012 19:14:16 +0330
Subject: [PATCH] fbpad: c-m-l locks the screen

After this command, fbpad freezes until PASS (specified in config.h)
followed by return is entered.  A NULL PASS disables locking.
---
 README   |  1 +
 config.h |  3 +++
 fbpad.c  | 19 +++++++++++++++++++
 3 files changed, 23 insertions(+)

diff --git a/README b/README
index 4750d2b..6b84374 100644
--- a/README
+++ b/README
@@ -20,6 +20,7 @@ m-o		jump to last tag
 m-tab		show next terminal
 m-s		create a text screenshot (SCRSHOT)
 m-y		redraw terminal
+c-m-l		lock the screen; use PASS to unlock
 c-m-q		quit fbpad
 ==============  =======================================
 
diff --git a/config.h b/config.h
index 81a9c01..3e5aae2 100644
--- a/config.h
+++ b/config.h
@@ -18,6 +18,9 @@ typedef unsigned int fbval_t;
 /* where to write the screen shot */
 #define SCRSHOT		"/tmp/scr"
 
+/* lock command password; NULL disables locking */
+#define PASS		NULL
+
 /* optimized version of fb_val() */
 #define FB_VAL(r, g, b)	fb_val((r), (g), (b))
 
diff --git a/fbpad.c b/fbpad.c
index 7b57dee..4032a28 100644
--- a/fbpad.c
+++ b/fbpad.c
@@ -37,6 +37,9 @@ static int ctag;		/* current tag */
 static int ltag;		/* the last tag */
 static int exitit;
 static int hidden;
+static int locked;
+static char pass[1024];
+static int passlen;
 
 static int readchar(void)
 {
@@ -138,6 +141,18 @@ static void showtags(void)
 static void directkey(void)
 {
 	int c = readchar();
+	if (PASS && locked) {
+		if (c == '\r') {
+			pass[passlen] = '\0';
+			if (!strcmp(PASS, pass))
+				locked = 0;
+			passlen = 0;
+			return;
+		}
+		if (isprint(c) && passlen + 1 < sizeof(pass))
+			pass[passlen++] = c;
+		return;
+	}
 	if (c == ESC) {
 		switch ((c = readchar())) {
 		case 'c':
@@ -171,6 +186,10 @@ static void directkey(void)
 		case 'y':
 			term_switch(cterm(), cterm(), 1, 0, 1);
 			return;
+		case CTRLKEY('l'):
+			locked = 1;
+			passlen = 0;
+			return;
 		default:
 			if (strchr(tags, c)) {
 				showtag(strchr(tags, c) - tags);
-- 
2.11.4.GIT