time/gmtime.c

   1 /* Convert `time_t' to `struct tm' in UTC.
   2    Copyright (C) 1991-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <time.h>
  20
  21 /* Return the `struct tm' representation of *T in UTC,
  22    using *TP to store the result.  */
  23 struct tm *
  24 __gmtime64_r (const __time64_t *t, struct tm *tp)
  25 {
  26   return __tz_convert (*t, 0, tp);
  27 }
  28
  29 /* Provide a 32-bit variant if needed.  */
  30
  31 #if __TIMESIZE != 64
  32
  33 libc_hidden_def (__gmtime64_r)
  34
  35 struct tm *
  36 __gmtime_r (const time_t *t, struct tm *tp)
  37 {
  38   __time64_t t64 = *t;
  39   return __gmtime64_r (&t64, tp);
  40 }
  41
  42 #endif
  43
  44 libc_hidden_def (__gmtime_r)
  45 weak_alias (__gmtime_r, gmtime_r)
  46
  47 /* Return the `struct tm' representation of *T in UTC.  */
  48 struct tm *
  49 __gmtime64 (const __time64_t *t)
  50 {
  51   return __tz_convert (*t, 0, &_tmbuf);
  52 }
  53
  54 /* Provide a 32-bit variant if needed.  */
  55
  56 #if __TIMESIZE != 64
  57
  58 libc_hidden_def (__gmtime64)
  59
  60 struct tm *
  61 gmtime (const time_t *t)
  62 {
  63   __time64_t t64 = *t;
  64   return __gmtime64 (&t64);
  65 }
  66
  67 #endif