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* timegm.c: New replacement function. Removes the need for setenv.c and

Browse source 
unsetenv.c.

* setenv.c: Removed.

* unsetenv.c: Removed.
This commit is contained in:
David Shaw 2004-05-21 15:18:32 +00:00
parent 228e1a55a4
commit be6dd2e1ed
4 changed files with 76 additions and 109 deletions
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util/timegm.c Normal file
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/* timegm.c - libc replacement function
* Copyright (C) 2004 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GnuPG 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
/*
timegm() is a GNU function that might not be available everywhere.
It's basically the inverse of gmtime() - you give it a struct tm,
and get back a time_t. It differs from mktime() in that it handles
the case where the struct tm is UTC and the local environment isn't.
Some BSDs don't handle the putenv("foo") case properly, so we use
unsetenv if the platform has it to remove environment variables.
*/
#include <config.h>
#include <time.h>
#include <stdlib.h>
#include <string.h>
time_t
timegm(struct tm *tm)
{
time_t answer;
char *zone;
zone=getenv("TZ");
putenv("TZ=UTC");
tzset();
answer=mktime(tm);
if(zone)
{
char *old_zone;
old_zone=malloc(3+strlen(zone)+1);
if(old_zone)
{
strcpy(old_zone,"TZ=");
strcat(old_zone,zone);
putenv(old_zone);
}
}
else
#ifdef HAVE_UNSETENV
unsetenv("TZ");
#else
putenv("TZ");
#endif
tzset();
return answer;
}