libc/test/src/time/gmtime_r_test.cpp

   1 //===-- Unittests for gmtime_r --------------------------------------------===//
   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/gmtime_r.h"
  10 #include "src/time/time_constants.h"
  11 #include "test/UnitTest/Test.h"
  12 #include "test/src/time/TmMatcher.h"
  13
  14 // gmtime and gmtime_r share the same code and thus didn't repeat all the tests
  15 // from gmtime. Added couple of validation tests.
  16 TEST(LlvmLibcGmTimeR, EndOf32BitEpochYear) {
  17   // Test for maximum value of a signed 32-bit integer.
  18   // Test implementation can encode time for Tue 19 January 2038 03:14:07 UTC.
  19   time_t seconds = 0x7FFFFFFF;
  20   struct tm tm_data;
  21   struct tm *tm_data_ptr;
  22   tm_data_ptr = LIBC_NAMESPACE::gmtime_r(&seconds, &tm_data);
  23   EXPECT_TM_EQ(
  24       (tm{7,  // sec
  25           14, // min
  26           3,  // hr
  27           19, // day
  28           0,  // tm_mon starts with 0 for Jan
  29           2038 - LIBC_NAMESPACE::time_constants::TIME_YEAR_BASE, // year
  30           2,                                                     // wday
  31           7,                                                     // yday
  32           0}),
  33       *tm_data_ptr);
  34   EXPECT_TM_EQ(*tm_data_ptr, tm_data);
  35 }
  36
  37 TEST(LlvmLibcGmTimeR, Max64BitYear) {
  38   if (sizeof(time_t) == 4)
  39     return;
  40   // Test for Tue Jan 1 12:50:50 in 2,147,483,647th year.
  41   time_t seconds = 67767976202043050;
  42   struct tm tm_data;
  43   struct tm *tm_data_ptr;
  44   tm_data_ptr = LIBC_NAMESPACE::gmtime_r(&seconds, &tm_data);
  45   EXPECT_TM_EQ(
  46       (tm{50, // sec
  47           50, // min
  48           12, // hr
  49           1,  // day
  50           0,  // tm_mon starts with 0 for Jan
  51           2147483647 - LIBC_NAMESPACE::time_constants::TIME_YEAR_BASE, // year
  52           2,                                                           // wday
  53           50,                                                          // yday
  54           0}),
  55       *tm_data_ptr);
  56   EXPECT_TM_EQ(*tm_data_ptr, tm_data);
  57 }