[settings] Display canonical setting name in "config" user interface

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/core/settings.c

 	return 0;
 }
 
+/**
+ * Return full setting name
+ *
+ * @v settings		Settings block, or NULL
+ * @v setting		Setting
+ * @v buf		Buffer
+ * @v len		Length of buffer
+ * @ret len		Length of setting name, or negative error
+ */
+int setting_name ( struct settings *settings, struct setting *setting,
+		   char *buf, size_t len ) {
+	const char *name;
+
+	if ( ! settings )
+		settings = &settings_root;
+
+	name = settings_name ( settings );
+	return snprintf ( buf, len, "%s%s%s:%s", name, ( name[0] ? "/" : "" ),
+			  setting->name, setting->type->name );
+}
+
 /**
  * Parse and store value of named setting
  *
 	struct settings *settings;
 	struct setting setting;
 	struct settings *origin;
-	const char *origin_name;
 	char tmp_name[ strlen ( name ) + 1 ];
 	int rc;
 
 	/* Construct setting name */
 	origin = fetch_setting_origin ( settings, &setting );
 	assert ( origin != NULL );
-	origin_name = settings_name ( origin );
-	snprintf ( name_buf, name_len, "%s%s%s:%s",
-		   origin_name, ( origin_name[0] ? "/" : "" ),
-		   setting.name, setting.type->name );
+	setting_name ( origin, &setting, name_buf, name_len );
 
 	return 0;
 }

src/hci/tui/settings_ui.c

 static void msg ( unsigned int row, const char *fmt, ... ) __nonnull;
 static void valert ( const char *fmt, va_list args ) __nonnull;
 static void alert ( const char *fmt, ... ) __nonnull;
-static void draw_info_row ( struct setting *setting ) __nonnull;
+static void draw_info_row ( struct settings *settings,
+			    struct setting *setting ) __nonnull;
 static int main_loop ( struct settings *settings ) __nonnull;
 
 /**
 /**
  * Draw information row
  *
+ * @v settings		Settings block
  * @v setting		Current configuration setting
  */
-static void draw_info_row ( struct setting *setting ) {
+static void draw_info_row ( struct settings *settings,
+			    struct setting *setting ) {
+	struct settings *origin;
+	char buf[32];
+
+	/* Determine a suitable setting name */
+	origin = fetch_setting_origin ( settings, setting );
+	if ( ! origin )
+		origin = settings;
+	setting_name ( origin, setting, buf, sizeof ( buf ) );
+
 	clearmsg ( INFO_ROW );
 	attron ( A_BOLD );
-	msg ( INFO_ROW, "%s - %s", setting->name, setting->description );
+	msg ( INFO_ROW, "%s - %s", buf, setting->description );
 	attroff ( A_BOLD );
 }
 
 	
 	while ( 1 ) {
 		/* Redraw information and instruction rows */
-		draw_info_row ( widget.setting );
+		draw_info_row ( widget.settings, widget.setting );
 		draw_instruction_row ( widget.editing );
 
 		/* Redraw current setting */

src/include/ipxe/settings.h

 extern struct settings * find_settings ( const char *name );
 extern struct setting * find_setting ( const char *name );
 
+extern int setting_name ( struct settings *settings, struct setting *setting,
+			  char *buf, size_t len );
 extern int storef_setting ( struct settings *settings,
 			    struct setting *setting,
 			    const char *value );