libc/src/time/ctime_r.cpp

   1 //===-- Implementation of ctime_r function --------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/time/ctime_r.h"
  10 #include "src/__support/CPP/limits.h"
  11 #include "src/__support/common.h"
  12 #include "src/__support/macros/config.h"
  13 #include "src/time/time_constants.h"
  14 #include "src/time/time_utils.h"
  15
  16 namespace LIBC_NAMESPACE_DECL {
  17
  18 LLVM_LIBC_FUNCTION(char *, ctime_r, (const time_t *t_ptr, char *buffer)) {
  19   if (t_ptr == nullptr || buffer == nullptr ||
  20       *t_ptr > cpp::numeric_limits<int32_t>::max()) {
  21     return nullptr;
  22   }
  23
  24   return time_utils::asctime(time_utils::localtime(t_ptr), buffer,
  25                              time_constants::ASCTIME_MAX_BYTES);
  26 }
  27
  28 } // namespace LIBC_NAMESPACE_DECL