timeout: factor out wait-for-key-press loop into separate file

This patch factors out the wait-for-key-press loop from the shell command
"timeout" into a sparate file, so that it can be used from C, too.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 67 insertions, 0 deletions

diff --git a/common/console_countdown.c b/common/console_countdown.c
new file mode 100644
index 0000000000..ffbdb4fa2d
--- /dev/null
+++ b/common/console_countdown.c
@@ -0,0 +1,67 @@
+/*
+ * console_countdown - contdown on the console - interruptible by a keypress
+ *
+ * Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <clock.h>
+#include <command.h>
+#include <errno.h>
+#include <console_countdown.h>
+#include <stdio.h>
+
+int console_countdown(int timeout_s, unsigned flags, char *out_key)
+{
+	uint64_t start, second;
+	int countdown, ret = -EINTR;
+	int key = 0;
+
+	start = get_time_ns();
+	second = start;
+
+	countdown = timeout_s;
+
+	if (!(flags & CONSOLE_COUNTDOWN_SILENT))
+		printf("%2d", countdown--);
+
+	do {
+		if (tstc()) {
+			key = getc();
+			if (flags & CONSOLE_COUNTDOWN_ANYKEY)
+				goto out;
+			if (flags & CONSOLE_COUNTDOWN_RETURN && key == '\n')
+				goto out;
+			if (flags & CONSOLE_COUNTDOWN_CTRLC && key == 3)
+				goto out;
+			key = 0;
+		}
+		if (!(flags & CONSOLE_COUNTDOWN_SILENT) &&
+		    is_timeout(second, SECOND)) {
+			printf("\b\b%2d", countdown--);
+			second += SECOND;
+		}
+	} while (!is_timeout(start, timeout_s * SECOND));
+
+	ret = 0;
+
+ out:
+	if (!(flags & CONSOLE_COUNTDOWN_SILENT))
+		printf("\n");
+	if (key && out_key)
+		*out_key = key;
+
+	return ret;
+}