Include scanf_internal.h

Author: petrhosek

libc/src/stdio/baremetal/scanf_internal.h

@@ -0,0 +1,30 @@
+//===-- Internal implementation header of scanf -----------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/__support/OSUtil/io.h"
+#include "src/__support/macros/config.h"
+#include "src/stdio/scanf_core/reader.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace scanf_core {
+
+struct StdinReader : public Reader<StdinReader> {
+  LIBC_INLINE char getc() {
+    char buf[1];
+    auto result = read_from_stdin(buf, sizeof(buf));
+    if (result <= 0)
+      return EOF;
+    return buf[0];
+  }
+  LIBC_INLINE void ungetc(int) {}
+};
+
+} // namespace scanf_core
+
+} // namespace LIBC_NAMESPACE_DECL