libc/printf: add support to print "%" character
Enable printf() in TF-A to print "%" character as C standard, which
may be used in platform porting to print percentage information.
Signed-off-by: Heyi Guo <guoheyi@linux.alibaba.com>
Change-Id: I7af2f1d153548e426f423fce15dc48b0da56c622
diff --git a/lib/libc/printf.c b/lib/libc/printf.c
index 2715a72..45e153e 100644
--- a/lib/libc/printf.c
+++ b/lib/libc/printf.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2014-2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2021, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -108,6 +108,9 @@
/* Check the format specifier */
loop:
switch (*fmt) {
+ case '%':
+ (void)putchar('%');
+ break;
case 'i': /* Fall through to next one */
case 'd':
num = get_num_va_args(args, l_count);