Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / core / getkey.c

diff --git a/qemu/roms/ipxe/src/core/getkey.c b/qemu/roms/ipxe/src/core/getkey.c
new file mode 100644 (file)
index 0000000..d69cfb4
--- /dev/null
+++ b/qemu/roms/ipxe/src/core/getkey.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2006 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 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.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <ctype.h>
+#include <ipxe/console.h>
+#include <ipxe/process.h>
+#include <ipxe/keys.h>
+#include <ipxe/timer.h>
+#include <ipxe/nap.h>
+
+/** @file
+ *
+ * Special key interpretation
+ *
+ */
+
+#define GETKEY_TIMEOUT ( TICKS_PER_SEC / 4 )
+
+/**
+ * Read character from console if available within timeout period
+ *
+ * @v timeout          Timeout period, in ticks (0=indefinite)
+ * @ret character      Character read from console
+ */
+static int getchar_timeout ( unsigned long timeout ) {
+       unsigned long start = currticks();
+
+       while ( ( timeout == 0 ) || ( ( currticks() - start ) < timeout ) ) {
+               step();
+               if ( iskey() )
+                       return getchar();
+               cpu_nap();
+       }
+
+       return -1;
+}
+
+/**
+ * Get single keypress
+ *
+ * @v timeout          Timeout period, in ticks (0=indefinite)
+ * @ret key            Key pressed
+ *
+ * The returned key will be an ASCII value or a KEY_XXX special
+ * constant.  This function differs from getchar() in that getchar()
+ * will return "special" keys (e.g. cursor keys) as a series of
+ * characters forming an ANSI escape sequence.
+ */
+int getkey ( unsigned long timeout ) {
+       int character;
+       unsigned int n = 0;
+
+       character = getchar_timeout ( timeout );
+       if ( character != ESC )
+               return character;
+
+       while ( ( character = getchar_timeout ( GETKEY_TIMEOUT ) ) >= 0 ) {
+               if ( character == '[' )
+                       continue;
+               if ( isdigit ( character ) ) {
+                       n = ( ( n * 10 ) + ( character - '0' ) );
+                       continue;
+               }
+               if ( character >= 0x40 )
+                       return KEY_ANSI ( n, character );
+       }
+
+       return ESC;
+}