Mercurial > gnulib
view lib/mktime-internal.h @ 18303:8b34efae5441
Port mktime_internal offset to unsigned time_t
This avoids some assumptions about wraparound arithmetic on
signed integer overflow.
* lib/mktime-internal.h (mktime_offset_t): New type.
(mktime_internal): Use it in decl.
* lib/mktime.c, lib/timegm.c (mktime_offset_t) [_LIBC]: New type.
* lib/mktime.c (__mktime_internal, localtime_offset):
* lib/timegm.c (timegm): Use it.
* m4/mktime.m4 (gl_TIME_T_IS_SIGNED): New macro.
(gl_FUNC_MKTIME): Require it.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Sun, 01 May 2016 11:44:51 -0700 |
parents | 465038ef6bc4 |
children | 12df2165ec1c |
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/* mktime variant that also uses an offset guess Copyright 2016 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this program; if not, see <http://www.gnu.org/licenses/>. */ #include <time.h> /* mktime_offset_t is a signed type wide enough to hold a UTC offset in seconds, and used as part of the type of the offset-guess argument to mktime_internal. Use time_t on platforms where time_t is signed, to be compatible with platforms like BeOS that export this implementation detail of mktime. On platforms where time_t is unsigned, GNU and POSIX code can assume 'int' is at least 32 bits which is wide enough for a UTC offset. */ #if TIME_T_IS_SIGNED typedef time_t mktime_offset_t; #else typedef int mktime_offset_t; #endif time_t mktime_internal (struct tm *, struct tm * (*) (time_t const *, struct tm *), mktime_offset_t *);