lib/mktime-internal.h

   1 /* mktime variant that also uses an offset guess
   2
   3    Copyright 2016-2019 Free Software Foundation, Inc.
   4
   5    This program 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    This program 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 this program; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <time.h>
  20
  21 /* mktime_offset_t is a signed type wide enough to hold a UTC offset
  22    in seconds, and used as part of the type of the offset-guess
  23    argument to mktime_internal.  Use time_t on platforms where time_t
  24    is signed, to be compatible with platforms like BeOS that export
  25    this implementation detail of mktime.  On platforms where time_t is
  26    unsigned, GNU and POSIX code can assume 'int' is at least 32 bits
  27    which is wide enough for a UTC offset.  */
  28
  29 #if TIME_T_IS_SIGNED
  30 typedef time_t mktime_offset_t;
  31 #else
  32 typedef int mktime_offset_t;
  33 #endif
  34
  35 time_t mktime_internal (struct tm *,
  36                         struct tm * (*) (time_t const *, struct tm *),
  37                         mktime_offset_t *);
  38
  39 /* Although glibc source code uses leading underscores, Gnulib wants
  40    ordinary names.
  41
  42    Portable standalone applications should supply a <time.h> that
  43    declares a POSIX-compliant localtime_r, for the benefit of older
  44    implementations that lack localtime_r or have a nonstandard one.
  45    Similarly for gmtime_r.  See the gnulib time_r module for one way
  46    to implement this.  */
  47
  48 #undef __gmtime_r
  49 #undef __localtime_r
  50 #define __gmtime_r gmtime_r
  51 #define __localtime_r localtime_r
  52
  53 #define __mktime_internal mktime_internal