From 9876b0b6156fb851583a5304429bfed46b2ed9ba Mon Sep 17 00:00:00 2001
From: guoshichao <guoshichao@xiaomi.com>
Date: Thu, 25 Apr 2024 19:10:14 +0800
Subject: [PATCH] wchar/fgetwc: fix the return value truncate error

Signed-off-by: guoshichao <guoshichao@xiaomi.com>
---
 libs/libc/stdio/lib_fgetwc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libs/libc/stdio/lib_fgetwc.c b/libs/libc/stdio/lib_fgetwc.c
index 90b451a6c9..463669fde0 100644
--- a/libs/libc/stdio/lib_fgetwc.c
+++ b/libs/libc/stdio/lib_fgetwc.c
@@ -69,7 +69,8 @@ wint_t fgetwc_unlocked(FAR FILE *f)
 
   while (l == -2)
     {
-      b = c = getc_unlocked(f);
+      c = getc_unlocked(f);
+      b = (char)c;
       if (c < 0)
         {
           if (!mbsinit(&st))