kconfig: Allow frontends to display messages themselves

Signed-off-by: Michal Marek <mmarek@suse.cz>

scripts/kconfig/confdata.c

@@ -19,6 +19,9 @@
 static void conf_warning(const char *fmt, ...)
 	__attribute__ ((format (printf, 1, 2)));
 
+static void conf_message(const char *fmt, ...)
+	__attribute__ ((format (printf, 1, 2)));
+
 static const char *conf_filename;
 static int conf_lineno, conf_warnings, conf_unsaved;
 
@@ -35,6 +38,29 @@ static void conf_warning(const char *fmt, ...)
 	conf_warnings++;
 }
 
+static void conf_default_message_callback(const char *fmt, va_list ap)
+{
+	printf("#\n# ");
+	vprintf(fmt, ap);
+	printf("\n#\n");
+}
+
+static void (*conf_message_callback) (const char *fmt, va_list ap) =
+	conf_default_message_callback;
+void conf_set_message_callback(void (*fn) (const char *fmt, va_list ap))
+{
+	conf_message_callback = fn;
+}
+
+static void conf_message(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	if (conf_message_callback)
+		conf_message_callback(fmt, ap);
+}
+
 const char *conf_get_configname(void)
 {
 	char *name = getenv("KCONFIG_CONFIG");
@@ -184,9 +210,8 @@ int conf_read_simple(const char *name, int def)
 			name = conf_expand_value(prop->expr->left.sym->name);
 			in = zconf_fopen(name);
 			if (in) {
-				printf(_("#\n"
-					 "# using defaults found in %s\n"
-					 "#\n"), name);
+				conf_message(_("using defaults found in %s"),
+					 name);
 				goto load;
 			}
 		}
@@ -651,9 +676,7 @@ next:
 			return 1;
 	}
 
-	printf(_("#\n"
-		 "# configuration written to %s\n"
-		 "#\n"), newname);
+	conf_message(_("configuration written to %s"), newname);
 
 	sym_set_change_count(0);
 

scripts/kconfig/lkc_proto.h

@@ -1,3 +1,4 @@
+#include <stdarg.h>
 
 /* confdata.c */
 P(conf_parse,void,(const char *name));
@@ -8,6 +9,7 @@ P(conf_write,int,(const char *name));
 P(conf_write_autoconf,int,(void));
 P(conf_get_changed,bool,(void));
 P(conf_set_changed_callback, void,(void (*fn)(void)));
+P(conf_set_message_callback, void,(void (*fn)(const char *fmt, va_list ap)));
 
 /* menu.c */
 P(rootmenu,struct menu,);

scripts/kconfig/nconf.c

@@ -651,25 +651,6 @@ static const char *set_config_filename(const char *config_filename)
 	return menu_backtitle;
 }
 
-/* command = 0 is supress, 1 is restore */
-static void supress_stdout(int command)
-{
-	static FILE *org_stdout;
-	static FILE *org_stderr;
-
-	if (command == 0) {
-		org_stdout = stdout;
-		org_stderr = stderr;
-		stdout = fopen("/dev/null", "a");
-		stderr = fopen("/dev/null", "a");
-	} else {
-		fclose(stdout);
-		fclose(stderr);
-		stdout = org_stdout;
-		stderr = org_stderr;
-	}
-}
-
 /* return = 0 means we are successful.
  * -1 means go on doing what you were doing
  */
@@ -695,9 +676,7 @@ static int do_exit(void)
 	/* if we got here, the user really wants to exit */
 	switch (res) {
 	case 0:
-		supress_stdout(0);
 		res = conf_write(filename);
-		supress_stdout(1);
 		if (res)
 			btn_dialog(
 				main_window,
@@ -707,19 +686,6 @@ static int do_exit(void)
 				  "changes were NOT saved."),
 				  1,
 				  "<OK>");
-		else {
-			char buf[1024];
-			snprintf(buf, 1024,
-				_("Configuration written to %s\n"
-				  "End of Linux kernel configuration.\n"
-				  "Execute 'make' to build the kernel or try"
-				  " 'make help'."), filename);
-			btn_dialog(
-				main_window,
-				buf,
-				1,
-				"<OK>");
-		}
 		break;
 	default:
 		btn_dialog(
@@ -1255,6 +1221,14 @@ static void conf(struct menu *menu)
 	}
 }
 
+static void conf_message_callback(const char *fmt, va_list ap)
+{
+	char buf[1024];
+
+	vsnprintf(buf, sizeof(buf), fmt, ap);
+	btn_dialog(main_window, buf, 1, "<OK>");
+}
+
 static void show_help(struct menu *menu)
 {
 	struct gstr help = str_new();
@@ -1477,16 +1451,8 @@ static void conf_save(void)
 		case 0:
 			if (!dialog_input_result[0])
 				return;
-			supress_stdout(0);
 			res = conf_write(dialog_input_result);
-			supress_stdout(1);
 			if (!res) {
-				char buf[1024];
-				sprintf(buf, "%s %s",
-					_("configuration file saved to: "),
-					dialog_input_result);
-				btn_dialog(main_window,
-					   buf, 1, "<OK>");
 				set_config_filename(dialog_input_result);
 				return;
 			}
@@ -1579,6 +1545,7 @@ int main(int ac, char **av)
 				_(menu_no_f_instructions));
 	}
 
+	conf_set_message_callback(conf_message_callback);
 	/* do the work */
 	while (!global_exit) {
 		conf(&rootmenu);