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87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/* mischelp.c - Miscellaneous helper functions
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* Copyright (C) 1998, 2000, 2001, 2006 Free Software Foundation, Inc.
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*
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* This file is part of JNLIB.
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*
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* JNLIB is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 3 of
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* the License, or (at your option) any later version.
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*
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* JNLIB is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include "libjnlib-config.h"
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#include "mischelp.h"
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/* A dummy function to prevent an empty compilation unit. Some
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compilers bail out in this case. */
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time_t
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libjnlib_dummy_mischelp_func (void)
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{
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return time (NULL);
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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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Note, that this replacement implementaion is not thread-safe!
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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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#ifndef HAVE_TIMEGM
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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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static char *old_zone;
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if (!old_zone)
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{
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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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}
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}
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if (old_zone)
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putenv (old_zone);
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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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#endif /*!HAVE_TIMEGM*/
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