[libc-commits] [libc] [libc] Implement freopen (PR #207837)

[Jeff Bailey via libc-commits]

================
@@ -0,0 +1,317 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Unittests for freopen.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/fcntl/fcntl.h"
+#include "src/stdio/clearerr.h"
+#include "src/stdio/fclose.h"
+#include "src/stdio/feof.h"
+#include "src/stdio/ferror.h"
+#include "src/stdio/fflush.h"
+#include "src/stdio/fileno.h"
+#include "src/stdio/fopen.h"
+#include "src/stdio/fread.h"
+#include "src/stdio/freopen.h"
+#include "src/stdio/fwrite.h"
+#include "src/stdio/stdout.h"
+#include "src/unistd/close.h"
+#include "src/wchar/fwide.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/Test.h"
+
+#include "hdr/fcntl_macros.h"
+#include "hdr/stdio_macros.h"
+#include "src/__support/macros/properties/os.h"
+
+using LlvmLibcFreopenTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
+using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
+
+TEST_F(LlvmLibcFreopenTest, ReopenFile) {
+  auto FILENAME_A =
----------------
kaladron wrote:

```suggestion
  const auto FILENAME_A =
```

(here and below)

https://github.com/llvm/llvm-project/pull/207837