Improved performance of the QLocale::name() function.

Task-number: QTBUG-19168
Reviewed-by: Zeno Albisser

1 files changed, 22 insertions, 9 deletions

diff --git a/src/corelib/tools/qlocale.cpp b/src/corelib/tools/qlocale.cpp
index c8ed94b..c398a5c 100644
--- a/src/corelib/tools/qlocale.cpp
+++ b/src/corelib/tools/qlocale.cpp
@@ -942,19 +942,32 @@ QLocale::Country QLocale::country() const
 
 QString QLocale::name() const
 {
-    Language l = language();
+    const QLocalePrivate *dd = d();
 
-    QString result = d()->languageCode();
+    if (dd->m_language_id == QLocale::AnyLanguage)
+        return QString();
+    if (dd->m_language_id == QLocale::C)
+        return QLatin1String("C");
 
-    if (l == C)
-        return result;
+    const unsigned char *c = language_code_list + 3*(uint(dd->m_language_id));
 
-    Country c = country();
-    if (c == AnyCountry)
-        return result;
+    QString result(7, Qt::Uninitialized);
+    ushort *data = (ushort *)result.unicode();
+    const ushort *begin = data;
 
-    result.append(QLatin1Char('_'));
-    result.append(d()->countryCode());
+    *data++ = ushort(c[0]);
+    *data++ = ushort(c[1]);
+    if (c[2] != 0)
+        *data++ = ushort(c[2]);
+    if (dd->m_country_id != AnyCountry) {
+        *data++ = '_';
+        const unsigned char *c = country_code_list + 3*(uint(dd->m_country_id));
+        *data++ = ushort(c[0]);
+        *data++ = ushort(c[1]);
+        if (c[2] != 0)
+            *data++ = ushort(c[2]);
+    }
+    result.resize(data - begin);
 
     return result;
 }