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Annotation of qemu/roms/ipxe/src/usr/prompt.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (C) 2011 Michael Brown <[email protected]>.
        !             3:  *
        !             4:  * This program is free software; you can redistribute it and/or
        !             5:  * modify it under the terms of the GNU General Public License as
        !             6:  * published by the Free Software Foundation; either version 2 of the
        !             7:  * License, or any later version.
        !             8:  *
        !             9:  * This program is distributed in the hope that it will be useful, but
        !            10:  * WITHOUT ANY WARRANTY; without even the implied warranty of
        !            11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            12:  * General Public License for more details.
        !            13:  *
        !            14:  * You should have received a copy of the GNU General Public License
        !            15:  * along with this program; if not, write to the Free Software
        !            16:  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            17:  */
        !            18: 
        !            19: FILE_LICENCE ( GPL2_OR_LATER );
        !            20: 
        !            21: /** @file
        !            22:  *
        !            23:  * Prompt for keypress
        !            24:  *
        !            25:  */
        !            26: 
        !            27: #include <errno.h>
        !            28: #include <stdio.h>
        !            29: #include <ipxe/console.h>
        !            30: #include <ipxe/timer.h>
        !            31: #include <usr/prompt.h>
        !            32: 
        !            33: /**
        !            34:  * Prompt for keypress
        !            35:  *
        !            36:  * @v text             Prompt string
        !            37:  * @v wait_ms          Time to wait, in milliseconds (0=indefinite)
        !            38:  * @v key              Key to wait for (0=any key)
        !            39:  * @ret rc             Return status code
        !            40:  *
        !            41:  * Returns success if the specified key was pressed within the
        !            42:  * specified timeout period.
        !            43:  */
        !            44: int prompt ( const char *text, unsigned int wait_ms, int key ) {
        !            45:        int key_pressed;
        !            46: 
        !            47:        /* Display prompt */
        !            48:        printf ( "%s", text );
        !            49: 
        !            50:        /* Wait for key */
        !            51:        key_pressed = getkey ( ( wait_ms * TICKS_PER_SEC ) / 1000 );
        !            52: 
        !            53:        /* Clear the prompt line */
        !            54:        while ( *(text++) )
        !            55:                printf ( "\b \b" );
        !            56: 
        !            57:        /* Check for timeout */
        !            58:        if ( key_pressed < 0 )
        !            59:                return -ETIMEDOUT;
        !            60: 
        !            61:        /* Check for correct key pressed */
        !            62:        if ( key && ( key_pressed != key ) )
        !            63:                return -ECANCELED;
        !            64: 
        !            65:        return 0;
        !            66: }

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