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https://github.com/ipxe/ipxe
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ce9690ca39
F8 is represented by the ANSI escape sequence "^[[19~", which is not representable as a KEY_xxx constant using the current encoding scheme. Adapt the encoding scheme to allow F8 to be represented, since PXE requires that we may need to prompt the user to press F8.
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/*
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* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <ctype.h>
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#include <console.h>
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#include <gpxe/process.h>
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#include <gpxe/keys.h>
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#include <gpxe/timer.h>
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/** @file
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*
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* Special key interpretation
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*
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*/
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#define GETKEY_TIMEOUT ( TICKS_PER_SEC / 4 )
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/**
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* Read character from console if available within timeout period
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*
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* @v timeout Timeout period, in ticks
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* @ret character Character read from console
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*/
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static int getchar_timeout ( unsigned long timeout ) {
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unsigned long expiry = ( currticks() + timeout );
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while ( currticks() < expiry ) {
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step();
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if ( iskey() )
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return getchar();
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}
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return -1;
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}
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/**
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* Get single keypress
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*
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* @ret key Key pressed
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*
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* The returned key will be an ASCII value or a KEY_XXX special
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* constant. This function differs from getchar() in that getchar()
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* will return "special" keys (e.g. cursor keys) as a series of
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* characters forming an ANSI escape sequence.
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*/
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int getkey ( void ) {
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int character;
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unsigned int n = 0;
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character = getchar();
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if ( character != ESC )
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return character;
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while ( ( character = getchar_timeout ( GETKEY_TIMEOUT ) ) >= 0 ) {
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if ( character == '[' )
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continue;
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if ( isdigit ( character ) ) {
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n = ( ( n * 10 ) + ( character - '0' ) );
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continue;
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}
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if ( character >= 0x40 )
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return KEY_ANSI ( n, character );
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}
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return ESC;
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}
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