From 11751d60e0912a944803a8c593cc88e9819fab2e Mon Sep 17 00:00:00 2001
From: gztss <2269610337@qq.com>
Date: Thu, 24 Jan 2019 09:05:41 +0800
Subject: [PATCH] =?UTF-8?q?=E5=AE=9E=E7=8E=B0=5Fsys=5Fflen()=E5=87=BD?=
 =?UTF-8?q?=E6=95=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 components/libc/compilers/armlibc/stubs.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/components/libc/compilers/armlibc/stubs.c b/components/libc/compilers/armlibc/stubs.c
index 820daeff39..555108f712 100644
--- a/components/libc/compilers/armlibc/stubs.c
+++ b/components/libc/compilers/armlibc/stubs.c
@@ -265,7 +265,17 @@ void _sys_exit(int return_code)
  */
 long _sys_flen(FILEHANDLE fh)
 {
+    struct stat stat;
+    
+    if (fh < STDERR)
+        return -1;
+
+#ifndef RT_USING_DFS
     return -1;
+#else
+    fstat(fh, &stat);
+    return stat.st_size;
+#endif
 }
 
 int _sys_istty(FILEHANDLE fh)