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91176c3fee
qt5-qtbase/qtbase-opensource-src-5.7.0-QTBUG-53071.patch
Rex Dieter 91176c3fee 5.7.0-6 
- Backported QTBUG-53071 patch to resolve problem with latest tzdata.
- Fixed Source URL.
2016-12-12 06:41:27 -06:00

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From e9041c7fc1052167f1ec2df0ea9623059e55d00f Mon Sep 17 00:00:00 2001
From: Thiago Macieira <thiago.macieira@intel.com>
Date: Thu, 28 Apr 2016 22:09:01 -0700
Subject: [PATCH] Fix parsing of tzfile(5) POSIX rule zone names with bracket
quotes
POSIX.1-2001 allows quoting a zone name so that it can contain other
characters besides letters, by enclosing it in angle brackets ('<' and
'>'). This hadn't been used until recently (tzdata2016b), when the
Asia/Barnaul rule started using a zone name "+07" (the name variable
contained the value "<+07>-7").
Thanks to Paul Eggert for reporting and investigating the root cause.
Task-number: QTBUG-53071
Change-Id: Id5480807d25e49e78b79ffff1449bc410776cb66
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
---
src/corelib/tools/qtimezoneprivate_tz.cpp | 176 ++++++++++++++-------
.../auto/corelib/tools/qtimezone/tst_qtimezone.cpp | 10 ++
2 files changed, 130 insertions(+), 56 deletions(-)
diff --git a/src/corelib/tools/qtimezoneprivate_tz.cpp b/src/corelib/tools/qtimezoneprivate_tz.cpp
index 85ed345..cb9581a 100644
--- a/src/corelib/tools/qtimezoneprivate_tz.cpp
+++ b/src/corelib/tools/qtimezoneprivate_tz.cpp
@@ -41,6 +41,8 @@
#include <qdebug.h>
+#include "qlocale_tools_p.h"
+
#include <algorithm>
QT_BEGIN_NAMESPACE
@@ -384,25 +386,100 @@ static QTime parsePosixTime(const QByteArray &timeRule)
return QTime(2, 0, 0);
}
-static int parsePosixOffset(const QByteArray &timeRule)
+static int parsePosixOffset(const char *begin, const char *end)
{
// Format "[+|-]hh[:mm[:ss]]"
- QList<QByteArray> parts = timeRule.split(':');
- int count = parts.count();
- if (count == 3) {
- int hour = parts.at(0).toInt();
- int sign = hour >= 0 ? -1 : 1;
- return sign * ((qAbs(hour) * 60 * 60) + (parts.at(1).toInt() * 60) + parts.at(2).toInt());
- } else if (count == 2) {
- int hour = parts.at(0).toInt();
- int sign = hour >= 0 ? -1 : 1;
- return sign * ((qAbs(hour) * 60 * 60) + (parts.at(1).toInt() * 60));
- } else if (count == 1) {
- int hour = parts.at(0).toInt();
- int sign = hour >= 0 ? -1 : 1;
- return sign * (qAbs(hour) * 60 * 60);
- }
- return 0;
+ int hour, min = 0, sec = 0;
+
+ // note that the sign is inverted because POSIX counts in hours West of GMT
+ bool negate = true;
+ if (*begin == '+') {
+ ++begin;
+ } else if (*begin == '-') {
+ negate = false;
+ ++begin;
+ }
+
+ bool ok = false;
+ hour = qstrtoll(begin, &begin, 10, &ok);
+ if (!ok)
+ return INT_MIN;
+ if (begin < end && *begin == ':') {
+ // minutes
+ ++begin;
+ min = qstrtoll(begin, &begin, 10, &ok);
+ if (!ok || min < 0)
+ return INT_MIN;
+
+ if (begin < end && *begin == ':') {
+ // seconds
+ ++begin;
+ sec = qstrtoll(begin, &begin, 10, &ok);
+ if (!ok || sec < 0)
+ return INT_MIN;
+ }
+ }
+
+ // we must have consumed everything
+ if (begin != end)
+ return INT_MIN;
+
+ int value = (hour * 60 + min) * 60 + sec;
+ return negate ? -value : value;
+}
+
+static inline bool asciiIsLetter(char ch)
+{
+ ch |= 0x20; // lowercases if it is a letter, otherwise just corrupts ch
+ return ch >= 'a' && ch <= 'z';
+}
+
+// Returns the zone name, the offset (in seconds) and advances \a begin to
+// where the parsing ended. Returns a zone of INT_MIN in case an offset
+// couldn't be read.
+static QPair<QString, int> parsePosixZoneNameAndOffset(const char *&pos, const char *end)
+{
+ static const char offsetChars[] = "0123456789:";
+ QPair<QString, int> result = qMakePair(QString(), INT_MIN);
+
+ const char *nameBegin = pos;
+ const char *nameEnd;
+ Q_ASSERT(pos < end);
+
+ if (*pos == '<') {
+ nameBegin = pos + 1; // skip the '<'
+ nameEnd = nameBegin;
+ while (nameEnd < end && *nameEnd != '>') {
+ // POSIX says only alphanumeric, but we allow anything
+ ++nameEnd;
+ }
+ pos = nameEnd + 1; // skip the '>'
+ } else {
+ nameBegin = pos;
+ nameEnd = nameBegin;
+ while (nameEnd < end && asciiIsLetter(*nameEnd))
+ ++nameEnd;
+ pos = nameEnd;
+ }
+ if (nameEnd - nameBegin < 3)
+ return result; // name must be at least 3 characters long
+
+ // zone offset, form [+-]hh:mm:ss
+ const char *zoneBegin = pos;
+ const char *zoneEnd = pos;
+ if (zoneEnd < end && (zoneEnd[0] == '+' || zoneEnd[0] == '-'))
+ ++zoneEnd;
+ while (zoneEnd < end) {
+ if (strchr(offsetChars, char(*zoneEnd)) == NULL)
+ break;
+ ++zoneEnd;
+ }
+
+ result.first = QString::fromUtf8(nameBegin, nameEnd - nameBegin);
+ if (zoneEnd > zoneBegin)
+ result.second = parsePosixOffset(zoneBegin, zoneEnd);
+ pos = zoneEnd;
+ return result;
}
static QVector<QTimeZonePrivate::Data> calculatePosixTransitions(const QByteArray &posixRule,
@@ -419,51 +496,38 @@ static QVector<QTimeZonePrivate::Data> calculatePosixTransitions(const QByteArra
// POSIX Format is like "TZ=CST6CDT,M3.2.0/2:00:00,M11.1.0/2:00:00"
// i.e. "std offset dst [offset],start[/time],end[/time]"
- // See http://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html
+ // See the section about TZ at http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html
QList<QByteArray> parts = posixRule.split(',');
- QString name = QString::fromUtf8(parts.at(0));
- QString stdName;
- QString stdOffsetString;
- QString dstName;
- QString dstOffsetString;
- bool parsedStdName = false;
- bool parsedStdOffset = false;
- for (int i = 0; i < name.size(); ++i) {
- if (name.at(i).isLetter()) {
- if (parsedStdName) {
- parsedStdOffset = true;
- dstName.append(name.at(i));
- } else {
- stdName.append(name.at(i));
+ QPair<QString, int> stdZone, dstZone;
+ {
+ const QByteArray &zoneinfo = parts.at(0);
+ const char *begin = zoneinfo.constBegin();
+
+ stdZone = parsePosixZoneNameAndOffset(begin, zoneinfo.constEnd());
+ if (stdZone.second == INT_MIN) {
+ stdZone.second = 0; // reset to UTC if we failed to parse
+ } else if (begin < zoneinfo.constEnd()) {
+ dstZone = parsePosixZoneNameAndOffset(begin, zoneinfo.constEnd());
+ if (dstZone.second == INT_MIN) {
+ // if the dst offset isn't provided, it is 1 hour ahead of the standard offset
+ dstZone.second = stdZone.second + (60 * 60);
}
- } else {
- parsedStdName = true;
- if (parsedStdOffset)
- dstOffsetString.append(name.at(i));
- else
- stdOffsetString.append(name.at(i));
}
}
- int utcOffset = parsePosixOffset(stdOffsetString.toUtf8());
-
// If only the name part then no transitions
if (parts.count() == 1) {
QTimeZonePrivate::Data data;
data.atMSecsSinceEpoch = lastTranMSecs;
- data.offsetFromUtc = utcOffset;
- data.standardTimeOffset = utcOffset;
+ data.offsetFromUtc = stdZone.second;
+ data.standardTimeOffset = stdZone.second;
data.daylightTimeOffset = 0;
- data.abbreviation = stdName;
+ data.abbreviation = stdZone.first;
result << data;
return result;
}
- // If not populated the total dst offset is 1 hour
- int dstOffset = utcOffset + (60 * 60);
- if (!dstOffsetString.isEmpty())
- dstOffset = parsePosixOffset(dstOffsetString.toUtf8());
// Get the std to dst transtion details
QList<QByteArray> dstParts = parts.at(1).split('/');
@@ -486,18 +550,18 @@ static QVector<QTimeZonePrivate::Data> calculatePosixTransitions(const QByteArra
for (int year = startYear; year <= endYear; ++year) {
QTimeZonePrivate::Data dstData;
QDateTime dst(calculatePosixDate(dstDateRule, year), dstTime, Qt::UTC);
- dstData.atMSecsSinceEpoch = dst.toMSecsSinceEpoch() - (utcOffset * 1000);
- dstData.offsetFromUtc = dstOffset;
- dstData.standardTimeOffset = utcOffset;
- dstData.daylightTimeOffset = dstOffset - utcOffset;
- dstData.abbreviation = dstName;
+ dstData.atMSecsSinceEpoch = dst.toMSecsSinceEpoch() - (stdZone.second * 1000);
+ dstData.offsetFromUtc = dstZone.second;
+ dstData.standardTimeOffset = stdZone.second;
+ dstData.daylightTimeOffset = dstZone.second - stdZone.second;
+ dstData.abbreviation = dstZone.first;
QTimeZonePrivate::Data stdData;
QDateTime std(calculatePosixDate(stdDateRule, year), stdTime, Qt::UTC);
- stdData.atMSecsSinceEpoch = std.toMSecsSinceEpoch() - (dstOffset * 1000);
- stdData.offsetFromUtc = utcOffset;
- stdData.standardTimeOffset = utcOffset;
+ stdData.atMSecsSinceEpoch = std.toMSecsSinceEpoch() - (dstZone.second * 1000);
+ stdData.offsetFromUtc = stdZone.second;
+ stdData.standardTimeOffset = stdZone.second;
stdData.daylightTimeOffset = 0;
- stdData.abbreviation = stdName;
+ stdData.abbreviation = stdZone.first;
// Part of the high year will overflow
if (year == 292278994 && (dstData.atMSecsSinceEpoch < 0 || stdData.atMSecsSinceEpoch < 0)) {
if (dstData.atMSecsSinceEpoch > 0) {
diff --git a/tests/auto/corelib/tools/qtimezone/tst_qtimezone.cpp b/tests/auto/corelib/tools/qtimezone/tst_qtimezone.cpp
index ea83510..ce72e7c 100644
--- a/tests/auto/corelib/tools/qtimezone/tst_qtimezone.cpp
+++ b/tests/auto/corelib/tools/qtimezone/tst_qtimezone.cpp
@@ -847,6 +847,16 @@ void tst_QTimeZone::tzTest()
QTzTimeZonePrivate::Data datatz2 = tztz2.data(std);
QTzTimeZonePrivate::Data datautc2 = tzutc2.data(std);
QCOMPARE(datatz2.offsetFromUtc, datautc2.offsetFromUtc);
+
+ // Test a timezone with a name that isn't all letters
+ QTzTimeZonePrivate tzBarnaul("Asia/Barnaul");
+ if (tzBarnaul.isValid()) {
+ QCOMPARE(tzBarnaul.data(std).abbreviation, QString("+07"));
+
+ // first full day of the new rule (tzdata2016b)
+ QDateTime dt(QDate(2016, 3, 28), QTime(0, 0, 0), Qt::UTC);
+ QCOMPARE(tzBarnaul.data(dt.toMSecsSinceEpoch()).abbreviation, QString("+07"));
+ }
#endif // Q_OS_UNIX
}
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