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DEFINITIONS
This source file includes following definitions.
- timelib_unixtime2gmt
- timelib_update_from_sse
- timelib_unixtime2local
- timelib_set_timezone
- timelib_apply_localtime
/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2013 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Derick Rethans <derick@derickrethans.nl> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "timelib.h"
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
static int month_tab_leap[12] = { -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
static int month_tab[12] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
/* Converts a Unix timestamp value into broken down time, in GMT */
void timelib_unixtime2gmt(timelib_time* tm, timelib_sll ts)
{
timelib_sll days, remainder, tmp_days;
timelib_sll cur_year = 1970;
timelib_sll i;
timelib_sll hours, minutes, seconds;
int *months;
days = ts / SECS_PER_DAY;
remainder = ts - (days * SECS_PER_DAY);
if (ts < 0 && remainder == 0) {
days++;
remainder -= SECS_PER_DAY;
}
TIMELIB_DEBUG(printf("days=%lld, rem=%lld\n", days, remainder););
if (ts >= 0) {
tmp_days = days + 1;
if (tmp_days >= DAYS_PER_LYEAR_PERIOD || tmp_days <= -DAYS_PER_LYEAR_PERIOD) {
cur_year += YEARS_PER_LYEAR_PERIOD * (tmp_days / DAYS_PER_LYEAR_PERIOD);
tmp_days -= DAYS_PER_LYEAR_PERIOD * (tmp_days / DAYS_PER_LYEAR_PERIOD);
}
while (tmp_days >= DAYS_PER_LYEAR) {
cur_year++;
if (timelib_is_leap(cur_year)) {
tmp_days -= DAYS_PER_LYEAR;
} else {
tmp_days -= DAYS_PER_YEAR;
}
}
} else {
tmp_days = days;
/* Guess why this might be for, it has to do with a pope ;-). It's also
* only valid for Great Brittain and it's colonies. It needs fixing for
* other locales. *sigh*, why is this crap so complex! */
/*
if (ts <= TIMELIB_LL_CONST(-6857352000)) {
tmp_days -= 11;
}
*/
while (tmp_days <= 0) {
if (tmp_days < -1460970) {
cur_year -= 4000;
TIMELIB_DEBUG(printf("tmp_days=%lld, year=%lld\n", tmp_days, cur_year););
tmp_days += 1460970;
} else {
cur_year--;
TIMELIB_DEBUG(printf("tmp_days=%lld, year=%lld\n", tmp_days, cur_year););
if (timelib_is_leap(cur_year)) {
tmp_days += DAYS_PER_LYEAR;
} else {
tmp_days += DAYS_PER_YEAR;
}
}
}
remainder += SECS_PER_DAY;
}
TIMELIB_DEBUG(printf("tmp_days=%lld, year=%lld\n", tmp_days, cur_year););
months = timelib_is_leap(cur_year) ? month_tab_leap : month_tab;
if (timelib_is_leap(cur_year) && cur_year < 1970) {
tmp_days--;
}
i = 11;
while (i > 0) {
TIMELIB_DEBUG(printf("month=%lld (%d)\n", i, months[i]););
if (tmp_days > months[i]) {
break;
}
i--;
}
TIMELIB_DEBUG(printf("A: ts=%lld, year=%lld, month=%lld, day=%lld,", ts, cur_year, i + 1, tmp_days - months[i]););
/* That was the date, now we do the tiiiime */
hours = remainder / 3600;
minutes = (remainder - hours * 3600) / 60;
seconds = remainder % 60;
TIMELIB_DEBUG(printf(" hour=%lld, minute=%lld, second=%lld\n", hours, minutes, seconds););
tm->y = cur_year;
tm->m = i + 1;
tm->d = tmp_days - months[i];
tm->h = hours;
tm->i = minutes;
tm->s = seconds;
tm->z = 0;
tm->dst = 0;
tm->sse = ts;
tm->sse_uptodate = 1;
tm->tim_uptodate = 1;
tm->is_localtime = 0;
}
void timelib_update_from_sse(timelib_time *tm)
{
timelib_sll sse;
sse = tm->sse;
switch (tm->zone_type) {
case TIMELIB_ZONETYPE_ABBR:
case TIMELIB_ZONETYPE_OFFSET: {
int z = tm->z;
signed int dst = tm->dst;
timelib_unixtime2gmt(tm, tm->sse - (tm->z * 60) + (tm->dst * 3600));
tm->z = z;
tm->dst = dst;
goto cleanup;
}
case TIMELIB_ZONETYPE_ID: {
timelib_time_offset *gmt_offset;
gmt_offset = timelib_get_time_zone_info(tm->sse, tm->tz_info);
timelib_unixtime2gmt(tm, tm->sse + gmt_offset->offset);
timelib_time_offset_dtor(gmt_offset);
goto cleanup;
}
default:
timelib_unixtime2gmt(tm, tm->sse);
goto cleanup;
}
cleanup:
tm->sse = sse;
tm->is_localtime = 1;
tm->have_zone = 1;
}
void timelib_unixtime2local(timelib_time *tm, timelib_sll ts)
{
timelib_time_offset *gmt_offset;
timelib_tzinfo *tz = tm->tz_info;
switch (tm->zone_type) {
case TIMELIB_ZONETYPE_ABBR:
case TIMELIB_ZONETYPE_OFFSET: {
int z = tm->z;
signed int dst = tm->dst;
timelib_unixtime2gmt(tm, ts - (tm->z * 60) + (tm->dst * 3600));
tm->z = z;
tm->dst = dst;
break;
}
case TIMELIB_ZONETYPE_ID:
gmt_offset = timelib_get_time_zone_info(ts, tz);
timelib_unixtime2gmt(tm, ts + gmt_offset->offset);
/* we need to reset the sse here as unixtime2gmt modifies it */
tm->sse = ts;
tm->dst = gmt_offset->is_dst;
tm->z = gmt_offset->offset;
tm->tz_info = tz;
timelib_time_tz_abbr_update(tm, gmt_offset->abbr);
timelib_time_offset_dtor(gmt_offset);
break;
default:
tm->is_localtime = 0;
tm->have_zone = 0;
return;
}
tm->is_localtime = 1;
tm->have_zone = 1;
}
void timelib_set_timezone(timelib_time *t, timelib_tzinfo *tz)
{
timelib_time_offset *gmt_offset;
gmt_offset = timelib_get_time_zone_info(t->sse, tz);
t->z = gmt_offset->offset;
/*
if (t->dst != gmt_offset->is_dst) {
printf("ERROR (%d, %d)\n", t->dst, gmt_offset->is_dst);
exit(1);
}
*/
t->dst = gmt_offset->is_dst;
t->tz_info = tz;
if (t->tz_abbr) {
free(t->tz_abbr);
}
t->tz_abbr = strdup(gmt_offset->abbr);
timelib_time_offset_dtor(gmt_offset);
t->have_zone = 1;
t->zone_type = TIMELIB_ZONETYPE_ID;
}
/* Converts the time stored in the struct to localtime if localtime = true,
* otherwise it converts it to gmttime. This is only done when necessary
* ofcourse. */
int timelib_apply_localtime(timelib_time *t, unsigned int localtime)
{
if (localtime) {
/* Converting from GMT time to local time */
TIMELIB_DEBUG(printf("Converting from GMT time to local time\n"););
/* Check if TZ is set */
if (!t->tz_info) {
TIMELIB_DEBUG(printf("E: No timezone configured, can't switch to local time\n"););
return -1;
}
timelib_unixtime2local(t, t->sse);
} else {
/* Converting from local time to GMT time */
TIMELIB_DEBUG(printf("Converting from local time to GMT time\n"););
timelib_unixtime2gmt(t, t->sse);
}
return 0;
}