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/*
* Copyright 2001-2004 Brandon Long
* All Rights Reserved.
*
* ClearSilver Templating System
*
* This code is made available under the terms of the ClearSilver License.
* http://www.clearsilver.net/license.hdf
*
*/
#include "cs_config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <limits.h>
#include "util/neo_misc.h"
#include "neo_date.h"
/* This is pretty much a HACK. Eventually, we might bring the parsing
* and stuff into this library (we can use the public domain source code
* from ftp://elsie.nci.nih.gov/pub/ as a base)
*
* For now, we just do a putenv(TZ)... which sucks, especially since
* many versions of putenv do a strdup... and then leak the memory the
* next time you putenv the same var.
*/
/* Since this is set to a partial filename and TZ=, it can't be bigger
* than this */
static char TzBuf[_POSIX_PATH_MAX + 4];
static int time_set_tz (const char *mytimezone)
{
snprintf (TzBuf, sizeof(TzBuf), "TZ=%s", mytimezone);
putenv(TzBuf);
tzset();
return 0;
}
void neo_time_expand (const time_t tt, const char *mytimezone, struct tm *ttm)
{
const char *cur_tz = getenv("TZ");
int change_back = 0;
if (cur_tz == NULL || strcmp(mytimezone, cur_tz)) {
time_set_tz (mytimezone);
change_back = 1;
}
localtime_r (&tt, ttm);
if (cur_tz && change_back) {
time_set_tz(cur_tz);
}
}
time_t neo_time_compact (struct tm *ttm, const char *mytimezone)
{
time_t r;
int save_isdst = ttm->tm_isdst;
const char *cur_tz = getenv("TZ");
int change_back = 0;
if (cur_tz == NULL || strcmp(mytimezone, cur_tz)) {
time_set_tz (mytimezone);
change_back = 1;
}
ttm->tm_isdst = -1;
r = mktime(ttm);
ttm->tm_isdst = save_isdst;
if (cur_tz && change_back) {
time_set_tz(cur_tz);
}
return r;
}
/* Hefted from NCSA HTTPd src/util.c -- What a pain in the ass. */
long neo_tz_offset(struct tm *ttm) {
/* We assume here that HAVE_TM_ZONE implies HAVE_TM_GMTOFF and
* HAVE_TZNAME implies HAVE_TIMEZONE since AC_STRUCT_TIMEZONE defines
* the former and not the latter */
#if defined(HAVE_TM_ZONE)
return ttm->tm_gmtoff;
#elif defined(HAVE_TZNAME)
long tz;
#ifndef __CYGWIN__
tz = - timezone;
#else
tz = - _timezone;
#endif
if(ttm->tm_isdst)
tz += 3600;
return tz;
#else
long tz;
struct tm loc_tm, gmt_tm;
time_t tt;
/* We probably shouldn't use the _r versions here since this
* is for older platforms... */
tt = time(NULL);
localtime_r(&tt, &loc_tm);
gmtime_r(&tt, &gmt_tm);
tz = mktime(&loc_tm) - mktime(&gmt_tm);
return tz;
#endif /* GMT OFFSet Crap */
}
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