msvcrt: Reuse FILE object in wfreopen function.

dlls/msvcrt/file.c

@@ -3797,7 +3797,7 @@ MSVCRT_size_t CDECL fread_s(void *buf, MSVCRT_size_t buf_size, MSVCRT_size_t ele
  */
 MSVCRT_FILE* CDECL MSVCRT__wfreopen(const MSVCRT_wchar_t *path, const MSVCRT_wchar_t *mode, MSVCRT_FILE* file)
 {
-  int fd;
+    int open_flags, stream_flags, fd;
 
     TRACE(":path (%s) mode (%s) file (%p) fd (%d)\n", debugstr_w(path), debugstr_w(mode), file, file->_file);
 
@@ -3807,7 +3807,15 @@ MSVCRT_FILE* CDECL MSVCRT__wfreopen(const MSVCRT_wchar_t *path, const MSVCRT_wch
     else
     {
         MSVCRT_fclose(file);
-    file = MSVCRT__wfsopen(path, mode, MSVCRT__SH_DENYNO);
+        if (msvcrt_get_flags(mode, &open_flags, &stream_flags) == -1)
+            file = NULL;
+        else if((fd = MSVCRT__wopen(path, open_flags, MSVCRT__S_IREAD | MSVCRT__S_IWRITE)) < 0)
+            file = NULL;
+        else if(msvcrt_init_fp(file, fd, stream_flags) == -1)
+        {
+            file->_flag = 0;
+            file = NULL;
+        }
     }
     UNLOCK_FILES();
     return file;