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

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In-Reply-To: <llvm.org/llvm/llvm-project/pull/107285 at github.com>


================
@@ -0,0 +1,25 @@
+//===-- Implementation of ctime_r 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 "src/time/ctime_r.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/time/time_utils.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+using LIBC_NAMESPACE::time_utils::TimeConstants;
+
+LLVM_LIBC_FUNCTION(char *, ctime_r, (const time_t *t_ptr, char *buffer)) {
+  if (t_ptr > 2147483647) {
+    return llvm::createStringError(llvm::errc::invalid_argument, "ERROR");
----------------
lntue wrote:

I don't think `llvm::createStringError` and `llvm::errc::invalid_argument` are defined anywhere in `libc`, and we will not want the implementation to depend on other parts of llvm.

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