These changes are the raw update to qemu-2.6.

[kvmfornfv.git] / qemu / roms / ipxe / src / hci / jumpscroll.c

diff --git a/qemu/roms/ipxe/src/hci/jumpscroll.c b/qemu/roms/ipxe/src/hci/jumpscroll.c
new file mode 100644 (file)
index 0000000..dd6bcac
--- /dev/null
+++ b/qemu/roms/ipxe/src/hci/jumpscroll.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+/**
+ * Jump scrolling
+ *
+ */
+
+#include <assert.h>
+#include <ipxe/keys.h>
+#include <ipxe/jumpscroll.h>
+
+/**
+ * Handle keypress
+ *
+ * @v scroll           Jump scroller
+ * @v key              Key pressed by user
+ * @ret move           Scroller movement, or zero
+ */
+int jump_scroll_key ( struct jump_scroller *scroll, int key ) {
+
+       /* Sanity checks */
+       assert ( scroll->rows != 0 );
+       assert ( scroll->count != 0 );
+       assert ( scroll->current < scroll->count );
+       assert ( scroll->first < scroll->count );
+       assert ( scroll->first <= scroll->current );
+       assert ( scroll->current < ( scroll->first + scroll->rows ) );
+
+       /* Handle key, if applicable */
+       switch ( key ) {
+       case KEY_UP:
+               return -1;
+       case KEY_DOWN:
+               return +1;
+       case KEY_PPAGE:
+               return ( scroll->first - scroll->current - 1 );
+       case KEY_NPAGE:
+               return ( scroll->first - scroll->current + scroll->rows );
+       case KEY_HOME:
+               return -( scroll->count );
+       case KEY_END:
+               return +( scroll->count );
+       default:
+               return 0;
+       }
+}
+
+/**
+ * Move scroller
+ *
+ * @v scroll           Jump scroller
+ * @v move             Scroller movement
+ * @ret move           Continuing scroller movement (if applicable)
+ */
+int jump_scroll_move ( struct jump_scroller *scroll, int move ) {
+       int current = scroll->current;
+       int last = ( scroll->count - 1 );
+
+       /* Sanity checks */
+       assert ( move != 0 );
+       assert ( scroll->count != 0 );
+
+       /* Move to the new current item */
+       current += move;
+
+       /* Check for start/end of list */
+       if ( current < 0 ) {
+               /* We have attempted to move before the start of the
+                * list.  Move to the start of the list and continue
+                * moving forwards (if applicable).
+                */
+               scroll->current = 0;
+               return +1;
+       } else if ( current > last ) {
+               /* We have attempted to move after the end of the
+                * list.  Move to the end of the list and continue
+                * moving backwards (if applicable).
+                */
+               scroll->current = last;
+               return -1;
+       } else {
+               /* Update the current item and continue moving in the
+                * same direction (if applicable).
+                */
+               scroll->current = current;
+               return ( ( move > 0 ) ? +1 : -1 );
+       }
+}
+
+/**
+ * Jump scroll to new page (if applicable)
+ *
+ * @v scroll           Jump scroller
+ * @ret jumped         Jumped to a new page
+ */
+int jump_scroll ( struct jump_scroller *scroll ) {
+       unsigned int index;
+
+       /* Sanity checks */
+       assert ( scroll->rows != 0 );
+       assert ( scroll->count != 0 );
+       assert ( scroll->current < scroll->count );
+       assert ( scroll->first < scroll->count );
+
+       /* Do nothing if we are already on the correct page */
+       index = ( scroll->current - scroll->first );
+       if ( index < scroll->rows )
+               return 0;
+
+       /* Move to required page */
+       while ( scroll->first < scroll->current )
+               scroll->first += scroll->rows;
+       while ( scroll->first > scroll->current )
+               scroll->first -= scroll->rows;
+
+       return 1;
+}