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67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/* timegm.c - libc replacement function
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* Copyright (C) 2004 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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timegm() is a GNU function that might not be available everywhere.
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It's basically the inverse of gmtime() - you give it a struct tm,
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and get back a time_t. It differs from mktime() in that it handles
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the case where the struct tm is UTC and the local environment isn't.
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Some BSDs don't handle the putenv("foo") case properly, so we use
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unsetenv if the platform has it to remove environment variables.
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*/
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#include <config.h>
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#include <time.h>
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#include <stdlib.h>
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#include <string.h>
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time_t
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timegm(struct tm *tm)
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{
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time_t answer;
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char *zone;
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zone=getenv("TZ");
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putenv("TZ=UTC");
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tzset();
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answer=mktime(tm);
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if(zone)
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{
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char *old_zone;
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old_zone=malloc(3+strlen(zone)+1);
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if(old_zone)
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{
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strcpy(old_zone,"TZ=");
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strcat(old_zone,zone);
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putenv(old_zone);
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}
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}
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else
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#ifdef HAVE_UNSETENV
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unsetenv("TZ");
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#else
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putenv("TZ");
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#endif
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tzset();
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return answer;
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}
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