[libc-commits] [libc] [libc] implement ungetwc (PR #196162)

[Muhammad Bassiouni via libc-commits]

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@@ -0,0 +1,26 @@
+//===-- Implementation of ungetwc -----------------------------------------===//
+//
+// 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/wchar/ungetwc.h"
+#include "hdr/types/FILE.h"
+#include "hdr/types/wint_t.h"
+#include "src/__support/File/file.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/null_check.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(wint_t, ungetwc, (wint_t wc, ::FILE *stream)) {
+  LIBC_CRASH_ON_NULLPTR(stream);
+
+  auto *f = reinterpret_cast<File *>(stream);
+  return f->ungetwc(wc);
----------------
bassiounix wrote:

no need for the `f` variable here
```suggestion
  return reinterpret_cast<File *>(stream)->ungetwc(wc);
```

https://github.com/llvm/llvm-project/pull/196162