Added UTF8 multibyte to wide char printing in some apps (#106)

* Added UTF8 multibyte to wide char printing in some apps

* Fix test compile

* Reduce diff churn

Co-authored-by: Steve Karg <skarg@users.sourceforge.net>

apps/readprop/main.c

@@ -29,6 +29,9 @@
 #include <stdlib.h>
 #include <errno.h>
 #include <time.h> /* for time */
+#ifdef __STDC_ISO_10646__
+#include <locale.h>
+#endif
 
 #define PRINT_ENABLED 1
 
@@ -363,6 +366,17 @@ int main(int argc, char *argv[])
     Device_Set_Object_Instance_Number(BACNET_MAX_INSTANCE);
     Init_Service_Handlers();
     dlenv_init();
+#ifdef __STDC_ISO_10646__
+    /* Internationalized programs must call setlocale()
+     * to initiate a specific language operation.
+     * This can be done by calling setlocale() as follows.
+     * If your native locale doesn't use UTF-8 encoding
+     * you need to replace the empty string with a
+     * locale like "en_US.utf8" which is the same as the string
+     * used in the enviromental variable "LANG=en_US.UTF-8".
+     */
+    setlocale(LC_ALL, "");
+#endif
     atexit(datalink_cleanup);
     /* configure the timeout values */
     last_seconds = time(NULL);