static void
show(timezone_t tz, char *zone, time_t t, bool v)
{
struct tm * tmp;
struct tm * gmtmp;
struct tm tm, gmtm;
(void) printf("%-*s ", (int) longest, zone);
if (v) {
gmtmp = my_gmtime_r(&t, &gmtm);
if (gmtmp == NULL) {
printf(tformat(), t);
} else {
dumptime(gmtmp);
(void) printf(" UT");
}
(void) printf(" = ");
}
tmp = my_localtime_rz(tz, &t, &tm);
dumptime(tmp);
if (tmp != NULL) {
if (*abbr(tmp) != '\0')
(void) printf(" %s", abbr(tmp));
if (v) {
long off = gmtoff(tmp, NULL, gmtmp);
(void) printf(" isdst=%d", tmp->tm_isdst);
if (off != LONG_MIN)
(void) printf(" gmtoff=%ld", off);
}
}
(void) printf("\n");
if (tmp != NULL && *abbr(tmp) != '\0')
abbrok(abbr(tmp), zone);
}
int KSystemTimeZoneBackend::offset(const KTimeZone *caller, time_t t) const
{
if (!caller->isValid() || t == KTimeZone::InvalidTime_t)
return 0;
// Make this time zone the current local time zone
const QByteArray originalZone = qgetenv("TZ"); // save the original local time zone
QByteArray tz = caller->name().toUtf8();
tz.prepend(":");
bool change = (tz != originalZone);
if (change)
{
::setenv("TZ", tz, 1);
::tzset();
}
int secs = gmtoff(t);
if (change)
{
// Restore the original local time zone
if (originalZone.isEmpty())
::unsetenv("TZ");
else
::setenv("TZ", originalZone, 1);
::tzset();
}
return secs;
}
/* Store into BUF, of size SIZE, a formatted UTC offset for the
localtime *TM corresponding to time T. Use ISO 8601 format
+HH:MM:SS, or -HH:MM:SS for time stamps west of Greenwich. Omit
:SS if :SS is zero, and omit :MM too if :MM is also zero. If the
time stamp represents an unknown UTC offset, use the format -00.
Return the length of the resulting string, or -1 if the result is
not representable as a string. If the string does not fit, return
the length that the string would have been if it had fit; do not
overrun the output buffer. */
static int
format_utc_offset(char *buf, size_t size, struct tm const *tm, time_t t)
{
long off = gmtoff(tm, &t, NULL);
char sign = ((off < 0
|| (off == 0
&& (*abbr(tm) == '-' || strcmp(abbr(tm), "zzz") == 0)))
? '-' : '+');
long hh;
int mm, ss;
if (off < 0)
{
if (off == LONG_MIN)
return -1;
off = -off;
}
ss = off % 60;
mm = off / 60 % 60;
hh = off / 60 / 60;
return (ss
? snprintf(buf, size, "%c%02ld:%02d:%02d", sign, hh, mm, ss)
: mm
? snprintf(buf, size, "%c%02ld:%02d", sign, hh, mm)
: snprintf(buf, size, "%c%02ld", sign, hh));
}
int KTimeZone::currentOffset(Qt::TimeSpec basis) const
{
// Get current offset of this time zone to UTC
const time_t now = time(0);
const int secs = offset(now);
switch (basis)
{
case Qt::LocalTime:
// Return the current offset of this time zone to the local system time
return secs - gmtoff(now);
case Qt::UTC:
// Return the current offset of this time zone to UTC
return secs;
default:
break;
}
return 0;
}
int KSystemTimeZoneBackend::offsetAtZoneTime(const KTimeZone *caller, const QDateTime &zoneDateTime, int *secondOffset) const
{
if (!caller->isValid() || !zoneDateTime.isValid() || zoneDateTime.timeSpec() != Qt::LocalTime)
return 0;
// Make this time zone the current local time zone
const QByteArray originalZone = qgetenv("TZ"); // save the original local time zone
QByteArray tz = caller->name().toUtf8();
tz.prepend(":");
bool change = (tz != originalZone);
if (change)
{
::setenv("TZ", tz, 1);
::tzset();
}
// Convert zone time to UTC, and then get the offset to UTC
tm tmtime;
tmtime.tm_sec = zoneDateTime.time().second();
tmtime.tm_min = zoneDateTime.time().minute();
tmtime.tm_hour = zoneDateTime.time().hour();
tmtime.tm_mday = zoneDateTime.date().day();
tmtime.tm_mon = zoneDateTime.date().month() - 1;
tmtime.tm_year = zoneDateTime.date().year() - 1900;
tmtime.tm_isdst = -1;
time_t t = mktime(&tmtime);
int offset1 = (t == (time_t)-1) ? 0 : gmtoff(t);
if (secondOffset)
{
int offset2 = offset1;
if (t != (time_t)-1)
{
// Check if there is a backward DST change near to this time, by
// checking if the UTC offset is different 1 hour later or earlier.
// ASSUMPTION: DST SHIFTS ARE NEVER GREATER THAN 1 HOUR.
int maxShift = 3600;
offset2 = gmtoff(t + maxShift);
if (offset2 < offset1)
{
// There is a backward DST shift during the following hour
if (offset1 - offset2 < maxShift)
offset2 = gmtoff(t + (offset1 - offset2));
}
else if ((offset2 = gmtoff(t - maxShift)) > offset1)
{
// There is a backward DST shift during the previous hour
if (offset2 - offset1 < maxShift)
offset2 = gmtoff(t - (offset2 - offset1));
// Put UTC offsets into the correct order
int o = offset1;
offset1 = offset2;
offset2 = o;
}
else offset2 = offset1;
}
*secondOffset = offset2;
}
if (change)
{
// Restore the original local time zone
if (originalZone.isEmpty())
::unsetenv("TZ");
else
::setenv("TZ", originalZone, 1);
::tzset();
}
return offset1;
}
time_t sl2mtime(time_t tt)
{
return tt + gmtoff(tt);
}
/*
* SEAlink time conversion
* FIXME: I think there is one year difference, spec starts at 1 jan 1979, mtime starts at 1 jan 1980
*/
time_t mtime2sl(time_t tt)
{
return tt - gmtoff(tt);
}
