summaryrefslogtreecommitdiffstats
path: root/src/corelib/tools/qdoublescanprint_p.h
diff options
context:
space:
mode:
authorUlf Hermann <ulf.hermann@theqtcompany.com>2015-10-15 15:40:26 +0200
committerSimon Hausmann <simon.hausmann@theqtcompany.com>2015-11-02 17:00:50 +0000
commit8c2ca33073f20e1fe552bd8b5f663aec5b8a634d (patch)
treea8277e71b865e3e08908a4937668e163c35a03e6 /src/corelib/tools/qdoublescanprint_p.h
parent84042523f272c1d30247e9329eea21036ff793f4 (diff)
Replace qdtoa and qstrtod implementation by a 3rdparty library
This also fixes the underlying cause of QTBUG-44039 and QTBUG-43885. You can choose between system, qt, and no libdouble-conversion support. If you choose "no", snprintf_l and sscanf_l will be used. By default, system double conversion is used if the system provides a double-conversion library. Otherwise the bundled libdouble-conversion is built. sscanf_l and snprintf_l are not used by default as the planned "shortest" conversion mode to produce the shortest possible string will give less precise results when implemented with snprintf_l. Change-Id: I8ca08a0fca5c54cf7009e48e771385614f6aa031 Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>
Diffstat (limited to 'src/corelib/tools/qdoublescanprint_p.h')
-rw-r--r--src/corelib/tools/qdoublescanprint_p.h150
1 files changed, 150 insertions, 0 deletions
diff --git a/src/corelib/tools/qdoublescanprint_p.h b/src/corelib/tools/qdoublescanprint_p.h
new file mode 100644
index 0000000000..30ac584d06
--- /dev/null
+++ b/src/corelib/tools/qdoublescanprint_p.h
@@ -0,0 +1,150 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QDOUBLESCANPRINT_P_H
+#define QDOUBLESCANPRINT_P_H
+
+//
+// W A R N I N G
+// -------------
+//
+// This file is not part of the Qt API. It exists for the convenience
+// of internal files. This header file may change from version to version
+// without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <qglobal.h>
+
+#if defined(Q_CC_MSVC) && (defined(QT_BOOTSTRAPPED) || defined(QT_NO_DOUBLECONVERSION))
+# include <stdio.h>
+# include <locale.h>
+
+QT_BEGIN_NAMESPACE
+
+// We can always use _sscanf_l and _snprintf_l on MSVC as those were introduced in 2005.
+
+// MSVC doesn't document what it will do with a NULL locale passed to _sscanf_l or _snprintf_l.
+// The documentation for _create_locale() does not formally document "C" to be valid, but an example
+// code snippet in the same documentation shows it.
+
+struct QCLocaleT {
+ QCLocaleT() : locale(_create_locale(LC_ALL, "C"))
+ {
+ }
+
+ ~QCLocaleT()
+ {
+ _free_locale(locale);
+ }
+
+ const _locale_t locale;
+};
+
+# define QT_CLOCALE_HOLDER Q_GLOBAL_STATIC(QCLocaleT, cLocaleT)
+# define QT_CLOCALE cLocaleT()->locale
+
+inline int qDoubleSscanf(const char *buf, _locale_t locale, const char *format, double *d,
+ int *processed)
+{
+ return _sscanf_l(buf, format, locale, d, processed);
+}
+
+inline int qDoubleSnprintf(char *buf, size_t buflen, _locale_t locale, const char *format, double d)
+{
+ return _snprintf_l(buf, buflen, format, locale, d);
+}
+
+QT_END_NAMESPACE
+
+#elif defined(QT_BOOTSTRAPPED)
+# include <stdio.h>
+
+QT_BEGIN_NAMESPACE
+
+// When bootstrapping we don't have libdouble-conversion available, yet. We can also not use locale
+// aware snprintf and sscanf variants in the general case because those are only available on select
+// platforms. We can use the regular snprintf and sscanf because we don't do setlocale(3) when
+// bootstrapping and the locale is always "C" then.
+
+# define QT_CLOCALE_HOLDER
+# define QT_CLOCALE 0
+
+inline int qDoubleSscanf(const char *buf, int, const char *format, double *d, int *processed)
+{
+ return sscanf(buf, format, d, processed);
+}
+inline int qDoubleSnprintf(char *buf, size_t buflen, int, const char *format, double d)
+{
+ return snprintf(buf, buflen, format, d);
+}
+
+QT_END_NAMESPACE
+
+#else // !QT_BOOTSTRAPPED && (!Q_CC_MSVC || !QT_NO_DOUBLECONVERSION)
+# ifdef QT_NO_DOUBLECONVERSION
+# include <stdio.h>
+# include <xlocale.h>
+
+QT_BEGIN_NAMESPACE
+
+// OS X and FreeBSD both treat NULL as the "C" locale for snprintf_l and sscanf_l.
+// When other implementations with different behavior show up, we'll have to do newlocale(3) and
+// freelocale(3) here. The arguments to those will depend on what the other implementations will
+// offer. OS X and FreeBSD again interpret a locale name of NULL as "C", but "C" itself is not
+// documented as valid locale name. Mind that the names of the LC_* constants differ between e.g.
+// BSD variants and linux.
+
+# define QT_CLOCALE_HOLDER
+# define QT_CLOCALE NULL
+
+inline int qDoubleSscanf(const char *buf, locale_t locale, const char *format, double *d,
+ int *processed)
+{
+ return sscanf_l(buf, locale, format, d, processed);
+}
+inline int qDoubleSnprintf(char *buf, size_t buflen, locale_t locale, const char *format, double d)
+{
+ return snprintf_l(buf, buflen, locale, format, d);
+}
+
+QT_END_NAMESPACE
+
+# else // !QT_NO_DOUBLECONVERSION
+# include <double-conversion/double-conversion.h>
+# define QT_CLOCALE_HOLDER
+# endif // QT_NO_DOUBLECONVERSION
+#endif // QT_BOOTSTRAPPED
+
+#endif // QDOUBLESCANPRINT_P_H