[PATCH V2] tiny-printf: Improve %X formatting

[Christoph Niedermaier]

If tiny printf is used with 0x%08X (upper case X) the output is
always 0x00000000. It could be confusing if upper case instead
of lower case is used intentionally or accidentally because the
actual value is not output. To avoid this confusion, treat output
of %X as %x. As a compromise for tiny printf, the hex value is
then output correctly, but in lower case. This is done to keep it
tiny printf small.

Signed-off-by: Christoph Niedermaier <cniedermaier at dh-electronics.com>
---
Cc: Marek Vasut <marex at denx.de>
Cc: Tom Rini <trini at konsulko.com>
Cc: Benedikt Spranger <b.spranger at linutronix.de>
Cc: Simon Glass <sjg at chromium.org>
Cc: John Ogness <john.ogness at linutronix.de>
Cc: Jerome Forissier <jerome.forissier at linaro.org>
Cc: Ilias Apalodimas <ilias.apalodimas at linaro.org>
---
 lib/tiny-printf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/tiny-printf.c b/lib/tiny-printf.c
index 0503c17341f..48db7b1f78f 100644
--- a/lib/tiny-printf.c
+++ b/lib/tiny-printf.c
@@ -284,6 +284,7 @@ static int _vprintf(struct printf_info *info, const char *fmt, va_list va)
 				islong = true;
 				/* no break */
 			case 'x':
+			case 'X':
 				if (islong) {
 					num = va_arg(va, unsigned long);
 					div = 1UL << (sizeof(long) * 8 - 4);
-- 
2.30.2