PC Extra Super CD 1998 January/PCPLUS131.iso/DJGPP/V2/DJLSR201.ZIP/src/libc/bios/bioskey.txh

Text File | 1995-07-10 | 817 b | 53 lines

@node bioskey, bios
@subheading Syntax

@example
#include <bios.h>

int bioskey(int command)
@end example

@subheading Description

@table @asis

@item @var{command} = 0

Returns the next key pressed

@item @var{command} = 1

Checks the keyboard, returns zero if no key pressed, else the key.  Does
not dequeue the key.

@item @var{command} = 2

Returns the shift state:

@example
7654 3210  Meaning

---- ---X  Right shift key down
---- --X-  Left shift key down
---- -X--  Ctrl key down
---- X---  Alt key down
---X ----  Scroll lock on
--X- ----  Num lock on
-X-- ----  Caps lock on
X--- ----  Insert on
@end example

@end table

@subheading Return Value

Depends on @var{command}.

@subheading Example

@example
while (!bioskey(1))
  do_stuff();
@end example