Use C++ classic locale for uses outside of Qt

Audio/tools/record_time_signal.cpp

@@ -3,8 +3,7 @@
 #include <stdexcept>
 #include <string>
 #include <memory>
-
-#include <locale.h>
+#include <locale>
 
 #include <QCoreApplication>
 #include <QTextStream>
@@ -239,11 +238,9 @@ int main(int argc, char *argv[])
   QCoreApplication app {argc, argv};
   try
     {
-      ::setlocale (LC_NUMERIC, "C"); // ensure number forms are in
-                                     // consistent format, do this
-                                     // after instantiating
-                                     // QApplication so that Qt has
-                                     // correct l18n
+      // ensure number forms are in consistent format, do this after
+      // instantiating QApplication so that Qt has correct l18n
+      std::locale::global (std::locale::classic ());
 
       // Override programs executable basename as application name.
       app.setApplicationName ("WSJT-X Record Time Signal");

UDPExamples/MessageAggregator.cpp

@@ -31,7 +31,7 @@
 // menu that allows each dock window to be hidden or revealed.
 //
 
-#include <clocale>
+#include <locale>
 #include <iostream>
 #include <exception>
 
@@ -52,10 +52,9 @@ int main (int argc, char * argv[])
   QApplication app {argc, argv};
   try
     {
-      setlocale (LC_NUMERIC, "C"); // ensure number forms are in
-                                   // consistent format, do this after
-                                   // instantiating QApplication so
-                                   // that GUI has correct l18n
+      // ensure number forms are in consistent format, do this after
+      // instantiating QApplication so that GUI has correct l18n
+      std::locale::global (std::locale::classic ());
 
       app.setApplicationName ("WSJT-X Reference UDP Message Aggregator Server");
       app.setApplicationVersion ("1.0");

UDPExamples/UDPDaemon.cpp

@@ -17,6 +17,7 @@
 
 #include <iostream>
 #include <exception>
+#include <locale>
 #include <cstdlib>
 
 #include <QCoreApplication>
@@ -263,10 +264,9 @@ int main (int argc, char * argv[])
   QCoreApplication app {argc, argv};
   try
     {
-      setlocale (LC_NUMERIC, "C"); // ensure number forms are in
-                                   // consistent format, do this after
-                                   // instantiating QApplication so
-                                   // that GUI has correct l18n
+      // ensure number forms are in consistent format, do this after
+      // instantiating QApplication so that GUI has correct l18n
+      std::locale::global (std::locale::classic ());
 
       app.setApplicationName ("WSJT-X UDP Message Server Daemon");
       app.setApplicationVersion ("1.0");

main.cpp

@@ -130,12 +130,8 @@ int main(int argc, char *argv[])
 
       QLocale locale;              // get the current system locale
 
-      // Set C/C++ locale used for logging etc.
-#if defined (Q_OS_WIN)
-      std::locale::global (std::locale ("C"));
-#else
-      std::locale::global (std::locale ("en_US.UTF-8"));
-#endif
+      // reset the C+ & C global locales to the classic C locale
+      std::locale::global (std::locale::classic ());
 
       // Override programs executable basename as application name.
       a.setApplicationName ("WSJT-X");