From b49859582a285e4d624521e483d7718e341d652a Mon Sep 17 00:00:00 2001
From: Bernard Xiong <bernard.xiong@gmail.com>
Date: Sun, 23 Sep 2018 14:43:21 +0800
Subject: [PATCH] [libc] Fix the fputc issue when use microlib.

---
 components/libc/compilers/armlibc/stubs.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/components/libc/compilers/armlibc/stubs.c b/components/libc/compilers/armlibc/stubs.c
index c826c8a0ec..83306a258d 100644
--- a/components/libc/compilers/armlibc/stubs.c
+++ b/components/libc/compilers/armlibc/stubs.c
@@ -313,17 +313,18 @@ int system(const char *string)
 
 int fputc(int c, FILE *f) 
 {
-    char ch = c;
+    char ch[2] = {0};
 
-    rt_kprintf(&ch);
+    ch[1] = c;
+    rt_kprintf(&ch[0]);
     return 1;
 }
 
 int fgetc(FILE *f) 
 {
+#ifdef RT_USING_POSIX
     char ch;
 
-#ifdef RT_USING_POSIX
     if (libc_stdio_read(&ch, 1) == 1)
         return ch;
 #endif