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  1. /*
  2. * Copyright (C) 2011 Michael Brown <mbrown@fensystems.co.uk>.
  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., 51 Franklin Street, Fifth Floor, Boston, MA
  17. * 02110-1301, USA.
  18. *
  19. * You can also choose to distribute this program under the terms of
  20. * the Unmodified Binary Distribution Licence (as given in the file
  21. * COPYING.UBDL), provided that you have satisfied its requirements.
  22. */
  23. FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
  24. /** @file
  25. *
  26. * Prompt for keypress
  27. *
  28. */
  29. #include <errno.h>
  30. #include <stdio.h>
  31. #include <ipxe/console.h>
  32. #include <usr/prompt.h>
  33. /**
  34. * Prompt for keypress
  35. *
  36. * @v text Prompt string
  37. * @v timeout Timeout period, in ticks (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 long timeout, int key ) {
  45. int key_pressed;
  46. /* Display prompt */
  47. printf ( "%s", text );
  48. /* Wait for key */
  49. key_pressed = getkey ( timeout );
  50. /* Clear the prompt line */
  51. while ( *(text++) )
  52. printf ( "\b \b" );
  53. /* Check for timeout */
  54. if ( key_pressed < 0 )
  55. return -ETIMEDOUT;
  56. /* Check for correct key pressed */
  57. if ( key && ( key_pressed != key ) )
  58. return -ECANCELED;
  59. return 0;
  60. }