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Parsing a timeout value (specified in milliseconds) into an internal timeout value measured in timer ticks is a common operation. Provide a parse_timeout() value to carry out this conversion automatically. Signed-off-by: Michael Brown <mcb30@ipxe.org>
67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
/*
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* Copyright (C) 2011 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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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/** @file
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*
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* Prompt for keypress
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*
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <ipxe/console.h>
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#include <usr/prompt.h>
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/**
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* Prompt for keypress
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*
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* @v text Prompt string
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* @v timeout Timeout period, in ticks (0=indefinite)
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* @v key Key to wait for (0=any key)
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* @ret rc Return status code
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*
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* Returns success if the specified key was pressed within the
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* specified timeout period.
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*/
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int prompt ( const char *text, unsigned long timeout, int key ) {
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int key_pressed;
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/* Display prompt */
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printf ( "%s", text );
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/* Wait for key */
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key_pressed = getkey ( timeout );
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/* Clear the prompt line */
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while ( *(text++) )
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printf ( "\b \b" );
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/* Check for timeout */
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if ( key_pressed < 0 )
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return -ETIMEDOUT;
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/* Check for correct key pressed */
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if ( key && ( key_pressed != key ) )
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return -ECANCELED;
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return 0;
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}
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