time/localtime.c

   1 /* Convert `time_t' to `struct tm' in local time zone.
   2    Copyright (C) 1991-2023 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 /* The C Standard says that localtime and gmtime return the same pointer.  */
  22 struct tm _tmbuf;
  23
  24
  25 /* Return the `struct tm' representation of *T in local time,
  26    using *TP to store the result.  */
  27 struct tm *
  28 __localtime64_r (const __time64_t *t, struct tm *tp)
  29 {
  30   return __tz_convert (*t, 1, tp);
  31 }
  32
  33 /* Provide a 32-bit variant if needed.  */
  34
  35 #if __TIMESIZE != 64
  36
  37 struct tm *
  38 __localtime_r (const time_t *t, struct tm *tp)
  39 {
  40   __time64_t t64 = *t;
  41   return __localtime64_r (&t64, tp);
  42 }
  43 libc_hidden_def (__localtime64_r)
  44
  45 #endif
  46
  47 weak_alias (__localtime_r, localtime_r)
  48
  49
  50 /* Return the `struct tm' representation of *T in local time.  */
  51 struct tm *
  52 __localtime64 (const __time64_t *t)
  53 {
  54   return __tz_convert (*t, 1, &_tmbuf);
  55 }
  56 libc_hidden_def (__localtime64)
  57
  58 /* Provide a 32-bit variant if needed.  */
  59
  60 #if __TIMESIZE != 64
  61
  62 struct tm *
  63 localtime (const time_t *t)
  64 {
  65   __time64_t t64 = *t;
  66   return __localtime64 (&t64);
  67 }
  68 libc_hidden_def (localtime)
  69
  70 #endif