From 3ad39e9878310e5317ee73c9b353c1e2c1c5c4ee Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Sat, 11 Jul 2026 22:48:30 +0800
Subject: lib: establish Zircon libc++ and KTL foundation

---
 lib/ktl/include/cstdio | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 lib/ktl/include/cstdio

(limited to 'lib/ktl/include/cstdio')

diff --git a/lib/ktl/include/cstdio b/lib/ktl/include/cstdio
new file mode 100644
index 0000000..349e736
--- /dev/null
+++ b/lib/ktl/include/cstdio
@@ -0,0 +1,21 @@
+// Copyright 2020 The Fuchsia Authors
+//
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT
+
+#ifndef ZIRCON_KERNEL_LIB_KTL_INCLUDE_CSTDIO_
+#define ZIRCON_KERNEL_LIB_KTL_INCLUDE_CSTDIO_
+
+// The kernel doesn't want this file but some libc++ headers we need
+// wind up including it and they need these declarations.
+//
+// Note this specifically avoids <stdio.h> because libc++ doesn't need that
+// but <string_view> indirectly reaches <cstdio> and the kernel's <stdio.h>
+// uses <ktl/string_view.h> so there would be a circularity.
+
+#include <wchar.h>
+
+#define EOF (-1)
+
+#endif  // ZIRCON_KERNEL_LIB_KTL_INCLUDE_CSTDIO_
-- 
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