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>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/corelib/tools/qlocale_tools_p.h b/src/corelib/tools/qlocale_tools_p.h
index 516a9fd05b..840ae8f163 100644
--- a/src/corelib/tools/qlocale_tools_p.h
+++ b/src/corelib/tools/qlocale_tools_p.h
@@ -66,6 +66,10 @@
 
 QT_BEGIN_NAMESPACE
 
+double asciiToDouble(const char *num, int numLen, bool &ok, int &processed);
+void doubleToAscii(double d, QLocaleData::DoubleForm form, int precision, char *buf, int bufSize,
+                   bool &sign, int &length, int &decpt);
+
 QString qulltoa(qulonglong l, int base, const QChar _zero);
 QString qlltoa(qlonglong l, int base, const QChar zero);
 Q_CORE_EXPORT QString qdtoa(qreal d, int *decpt, int *sign);
@@ -97,8 +101,6 @@ inline bool isZero(double d)
     }
 }
 
-Q_CORE_EXPORT char *qdtoa(double d, int mode, int ndigits, int *decpt,
-                          int *sign, char **rve, char **digits_str);
 Q_CORE_EXPORT double qstrtod(const char *s00, char const **se, bool *ok);
 qlonglong qstrtoll(const char *nptr, const char **endptr, int base, bool *ok);
 qulonglong qstrtoull(const char *nptr, const char **endptr, int base, bool *ok);