[editbox] Allow for password widgets that do not display their contents

src/hci/mucurses/widgets/editbox.c

  * @v row		Row
  * @v col		Starting column
  * @v width		Width
- *
+ * @v flags		Flags
  */
 void init_editbox ( struct edit_box *box, char *buf, size_t len,
 		    WINDOW *win, unsigned int row, unsigned int col,
-		    unsigned int width ) {
+		    unsigned int width, unsigned int flags ) {
 	memset ( box, 0, sizeof ( *box ) );
 	box->string.buf = buf;
 	box->string.len = len;
 	box->row = row;
 	box->col = col;
 	box->width = width;
+	box->flags = flags;
 }
 
 /**
 	len = ( strlen ( box->string.buf ) - first );
 	if ( len > width )
 		len = width;
-	memcpy ( buf, ( box->string.buf + first ), len );
+	if ( box->flags & EDITBOX_STARS ) {
+		memset ( buf, '*', len );
+	} else {
+		memcpy ( buf, ( box->string.buf + first ), len );
+	}
 
 	/* Print box content and move cursor */
 	if ( ! box->win )

src/hci/tui/settings_ui.c

 	init_editbox ( &widget->editbox, widget->value,
 		       sizeof ( widget->value ), NULL, widget->row,
 		       ( widget->col + offsetof ( struct setting_row, value )),
-		       sizeof ( ( ( struct setting_row * ) NULL )->value ) );
+		       sizeof ( ( ( struct setting_row * ) NULL )->value ), 0);
 }
 
 /**

src/include/gpxe/editbox.h

 	unsigned int width;
 	/** First displayed character */
 	unsigned int first;
+	/** Flags */
+	unsigned int flags;
+};
+
+/** Editable text box widget flags */
+enum edit_box_flags {
+	/** Show stars instead of contents (for password widgets) */
+	EDITBOX_STARS = 0x0001,
 };
 
 extern void init_editbox ( struct edit_box *box, char *buf, size_t len,
 			   WINDOW *win, unsigned int row, unsigned int col,
-			   unsigned int width ) 
+			   unsigned int width, unsigned int flags )
 			   __attribute__ (( nonnull (1, 2) ));
 extern void draw_editbox ( struct edit_box *box ) __nonnull;
-static inline int __pure edit_editbox ( struct edit_box *box, int key ) __nonnull;
+static inline int edit_editbox ( struct edit_box *box, int key ) __nonnull;
 
 /**
  * Edit text box widget