Add a "can_display_utf8" flag based on the current locale, for future use.

src/include/config.h.in

@@ -65,6 +65,9 @@
 /* IPC support enabled */
 #undef HAVE_IPC
 
+/* Define to 1 if you have the <langinfo.h> header file. */
+#undef HAVE_LANGINFO_H
+
 /* Define to 1 if you have the <libgen.h> header file. */
 #undef HAVE_LIBGEN_H
 

src/include/pv-internal.h

@@ -132,6 +132,7 @@ struct pvstate_s {
 		bool no_splice;                  /* never use splice() */
 		bool discard_input;              /* write nothing to stdout */
 		bool show_stats;		 /* show statistics on exit */
+		bool can_display_utf8;		 /* whether UTF-8 output is permitted */
 		bool width_set_manually;	 /* width was set manually, not detected */
 		bool height_set_manually;	 /* height was set manually, not detected */
 	} control;

src/include/pv.h

@@ -230,6 +230,7 @@ extern void pv_state_watch_pid_set(pvstate_t, pid_t);
 extern void pv_state_watch_fd_set(pvstate_t, int);
 extern void pv_state_output_set(pvstate_t, int, const char *);
 extern void pv_state_average_rate_window_set(pvstate_t, unsigned int);
+extern void pv_state_set_can_display_utf8(pvstate_t, bool);
 
 extern void pv_state_inputfiles(pvstate_t, unsigned int, const char **);