libc/src/time/ctime.cpp

   1 //===-- Implementation of ctime 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 "ctime.h"
  10 #include "src/__support/CPP/limits.h"
  11 #include "src/__support/common.h"
  12 #include "src/__support/macros/config.h"
  13 #include "time_utils.h"
  14
  15 namespace LIBC_NAMESPACE_DECL {
  16
  17 using LIBC_NAMESPACE::time_utils::TimeConstants;
  18
  19 LLVM_LIBC_FUNCTION(char *, ctime, (const time_t *t_ptr)) {
  20   if (t_ptr == nullptr || *t_ptr > cpp::numeric_limits<int32_t>::max()) {
  21     return nullptr;
  22   }
  23   static char buffer[TimeConstants::ASCTIME_BUFFER_SIZE];
  24   return time_utils::asctime(time_utils::localtime(t_ptr), buffer,
  25                              TimeConstants::ASCTIME_MAX_BYTES);
  26 }
  27
  28 } // namespace LIBC_NAMESPACE_DECL