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Annotation of qemu/roms/ipxe/src/usr/prompt.c, revision 1.1.1.1

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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