[clang] [clang-tools-extra] [libc] [libc][c11] implement ctime (PR #107285)

[Michael Jones via cfe-commits]

=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?=,
=?utf-8?b?0JfQuNGI0LDQvSDQnNC40YDQtw=?Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/107285 at github.com>


================
@@ -0,0 +1,38 @@
+//===-- Unittests for ctime -----------------------------------------------===//
+//
+// 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/errno/libc_errno.h"
+#include "src/time/ctime.h"
+#include "test/UnitTest/Test.h"
+#include "test/src/time/TmHelper.h"
+
+TEST(LlvmLibcCtime, Nullptr) {
+  char *result;
+  result = LIBC_NAMESPACE::ctime(nullptr);
+  ASSERT_ERRNO_EQ(EINVAL);
+  ASSERT_STREQ(nullptr, result);
+}
+
+TEST(LlvmLibcCtime, ValidUnixTimestamp0) {
+  struct time_t t = 0;
+  char *result = LIBC_NAMESPACE::ctime(t);
----------------
michaelrj-google wrote:

here and below, you need to pass a pointer to `t` to `ctime`
```suggestion
  char *result = LIBC_NAMESPACE::ctime(&t);
```

https://github.com/llvm/llvm-project/pull/107285