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-rw-r--r--libio/libioP.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/libio/libioP.h b/libio/libioP.h
index d23436ab26..59d20cd4be 100644
--- a/libio/libioP.h
+++ b/libio/libioP.h
@@ -71,6 +71,8 @@ extern "C" {
#define _IO_JUMPS(THIS) ((struct _IO_FILE_plus *) (THIS))->vtable
#define _IO_WIDE_JUMPS(THIS) ((struct _IO_FILE *) (THIS))->_wide_data->_wide_vtable
+#define _IO_CHECK_WIDE(THIS) (((struct _IO_FILE *) (THIS))->_wide_data != NULL)
+
#if _IO_JUMPS_OFFSET
# define _IO_JUMPS_FUNC(THIS) \
(*(struct _IO_jump_t **) ((void *) &((struct _IO_FILE_plus *) (THIS))->vtable\