KTimeZone KTimeZones::remove(const QString &name)
{
if (!name.isEmpty())
{
ZoneMap::Iterator it = d->zones.find(name);
if (it != d->zones.end())
{
KTimeZone zone = it.value();
d->zones.erase(it);
return zone;
}
}
return KTimeZone();
}
KTimeZone KTimeZones::remove(const KTimeZone &zone)
{
if (zone.isValid())
{
for (ZoneMap::Iterator it = d->zones.begin(), end = d->zones.end(); it != end; ++it)
{
if (it.value() == zone)
{
d->zones.erase(it);
return zone;
}
}
}
return KTimeZone();
}
const Timezone *Timezones::local()
{
const Timezone *local = 0;
// First try the simplest solution of checking for well-formed TZ setting.
char *envZone = ::getenv("TZ");
if (envZone)
{
if (envZone[0] == '\0')
{
return m_UTC;
}
else
if (envZone[0] == ':')
{
envZone++;
}
local = zone(envZone);
}
if (local)
return local;
// Try to match /etc/localtime against the list of zoneinfo files.
QFile f;
f.setFileName("/etc/localtime");
if (f.open(QIODevice::ReadOnly))
{
// Compute the MD5 sum of /etc/localtime.
KMD5 context("");
context.reset();
context.update(f);
qlonglong referenceSize = f.size();
QString referenceMd5Sum = context.hexDigest();
f.close();
if (!m_zoneinfoDir.isEmpty())
{
// Compare it with each zoneinfo file.
for (ZoneMap::Iterator it = m_zones->begin(); it != m_zones->end(); ++it)
{
Timezone *zone = it.value();
f.setFileName(m_zoneinfoDir + '/' + zone->name());
if (f.open(QIODevice::ReadOnly))
{
qlonglong candidateSize = f.size();
QString candidateMd5Sum;
if (candidateSize == referenceSize)
{
// Only do the heavy lifting for file sizes which match.
context.reset();
context.update(f);
candidateMd5Sum = context.hexDigest();
}
f.close();
if (candidateMd5Sum == referenceMd5Sum)
{
local = zone;
break;
}
}
}
}
}
if (local)
return local;
// BSD support.
QString fileZone;
f.setFileName("/etc/timezone");
if (!f.open(QIODevice::ReadOnly))
{
// Solaris support using /etc/default/init.
f.setFileName("/etc/default/init");
if (f.open(QIODevice::ReadOnly))
{
QTextStream ts(&f);
ts.setCodec("latin1");
// Read the last line starting "TZ=".
while (!ts.atEnd())
{
fileZone = ts.readLine();
if (fileZone.startsWith("TZ="))
{
fileZone = fileZone.mid(3);
local = zone(fileZone);
}
}
f.close();
}
}
else
{
QTextStream ts(&f);
ts.setCodec("latin1");
// Read the first line.
if (!ts.atEnd())
{
fileZone = ts.readLine();
local = zone(fileZone);
}
f.close();
}
if (local)
return local;
// None of the deterministic stuff above has worked: try a heuristic. We
// try to find a pair of matching timezone abbreviations...that way, we'll
// likely return a value in the user's own country.
if (!m_zoneinfoDir.isEmpty())
{
tzset();
AbbreviationsMatch matcher(tzname[0], tzname[1]);
int bestOffset = INT_MAX;
for (ZoneMap::Iterator it = m_zones->begin(); it != m_zones->end(); ++it)
{
Timezone *zone = it.value();
int candidateOffset = qAbs(zone->offset(Qt::LocalTime));
if (zone->parse(matcher) && matcher.test() && (candidateOffset < bestOffset))
{
bestOffset = candidateOffset;
local = zone;
}
}
}
if (local)
return local;
return m_UTC;
}