[PATCH] autoboot: Fix inconsistent countdown output

[Sam Protsenko]

Commit 5f70be08b015 ("Fix autoboot countdown printing wrong") introduces
inconsistency in how the countdown is displayed. For example, in case
when BOOTDELAY=5, the next output is observed during the boot:

    Hit any key to stop autoboot:  5
    Hit any key to stop autoboot: 4
    Hit any key to stop autoboot: 3

That happens due to different printf format (%2d vs %1d). Moreover, the
mentioned commit fails to handle the case when the user is holding some
key before the countdown is shown. E.g. if BOOTDELAY=101, the next
malformed output is being produced:

    Hit any key to stop autoboot: 1 0

That's because the fast path code wasn't modified accordingly, and still
tries to erase the number using '\b\b\b' format.

Fix both issues by introducing a dedicated routine for printing the
whole countdown line.

Fixes: 5f70be08b015 ("Fix autoboot countdown printing wrong")
Signed-off-by: Sam Protsenko <semen.protsenko at linaro.org>
---
 common/autoboot.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/common/autoboot.c b/common/autoboot.c
index e39f4a32f957..1783ef92c94c 100644
--- a/common/autoboot.c
+++ b/common/autoboot.c
@@ -5,6 +5,7 @@
  */
 
 #include <config.h>
+#include <ansi.h>
 #include <autoboot.h>
 #include <bootretry.h>
 #include <cli.h>
@@ -376,19 +377,24 @@ static int abortboot_key_sequence(int bootdelay)
 	return abort;
 }
 
+static void print_boot_delay(int bootdelay)
+{
+	printf(ANSI_CLEAR_LINE "\rHit any key to stop autoboot: %d", bootdelay);
+}
+
 static int abortboot_single_key(int bootdelay)
 {
 	int abort = 0;
 	unsigned long ts;
 
-	printf("Hit any key to stop autoboot: %2d ", bootdelay);
+	print_boot_delay(bootdelay);
 
 	/*
 	 * Check if key already pressed
 	 */
 	if (tstc()) {	/* we got a key press	*/
 		getchar();	/* consume input	*/
-		puts("\b\b\b 0");
+		print_boot_delay(0);
 		abort = 1;	/* don't auto boot	*/
 	}
 
@@ -410,7 +416,7 @@ static int abortboot_single_key(int bootdelay)
 			udelay(10000);
 		} while (!abort && get_timer(ts) < 1000);
 
-		printf("\rHit any key to stop autoboot: %1d\033[K", bootdelay);
+		print_boot_delay(bootdelay);
 	}
 
 	putc('\n');

base-commit: fd976ff3a233ae7c6a9f5bec790b02bbbf57bb24
-- 
2.39.5