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

[Michael Jones via libc-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=?Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/107285 at github.com>


================
@@ -0,0 +1,26 @@
+//===-- Implementation of ctime function ----------------------------------===//
+//
+// 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 "ctime.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "time_utils.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+using LIBC_NAMESPACE::time_utils::TimeConstants;
+
+LLVM_LIBC_FUNCTION(char *, ctime, (const time_t *t_ptr)) {
+  if (t_ptr > TimeConstants::MAXIMUM_32_BIT_VALUE) {
+    return nullptr;
+  }
+  static char buffer[TimeConstants::ASCTIME_BUFFER_SIZE];
+  return time_utils::asctime(localtime(t_ptr), buffer, TimeConstants::ASCTIME_MAX_BYTES);
----------------
michaelrj-google wrote:

make sure to call `time_utils::localtime` to avoid accidentally pulling in the system libc's version.

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