1 files changed, 32 insertions, 0 deletions
diff --git a/libc/stdio/fwide.c b/libc/stdio/fwide.c
new file mode 100644
index 000000000..422d789f3
--- /dev/null
+++ b/libc/stdio/fwide.c
@@ -0,0 +1,32 @@
+/* Copyright (C) 2004       Manuel Novoa III    <mjn3@codepoet.org>
+ *
+ * GNU Library General Public License (LGPL) version 2 or later.
+ *
+ * Dedicated to Toni.  See uClibc/DEDICATION.mjn3 for details.
+ */
+
+#include "_stdio.h"
+
+/* TODO: According to SUSv3 should return EBADF if invalid stream. */
+
+int fwide(register FILE *stream, int mode)
+{
+	__STDIO_AUTO_THREADLOCK_VAR;
+
+	__STDIO_AUTO_THREADLOCK(stream);
+
+	__STDIO_STREAM_VALIDATE(stream);
+
+	if (mode && !(stream->__modeflags & (__FLAG_WIDE|__FLAG_NARROW))) {
+		stream->__modeflags |= ((mode > 0) ? __FLAG_WIDE : __FLAG_NARROW);
+	}
+
+	mode = (stream->__modeflags & __FLAG_WIDE)
+		- (stream->__modeflags & __FLAG_NARROW);
+
+	assert((stream->__modeflags & (__FLAG_WIDE|__FLAG_NARROW))
+		   != (__FLAG_WIDE|__FLAG_NARROW));
+	__STDIO_AUTO_THREADUNLOCK(stream);
+
+	return mode;
+}