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/* This is file KBHIT.S */

/*

** Copyright (C) 1993 DJ Delorie

**

** This file is distributed under the terms listed in the document

** "copying.dj".

** A copy of "copying.dj" should accompany this file; if not, a copy

** should be available from where this file was obtained.  This file

** may not be distributed without a verbatim copy of "copying.dj".

**

** This file is distributed WITHOUT ANY WARRANTY; without even the implied

** warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

*/

        .globl  _kbhit

_kbhit:

        pushl   %ebp

        movl    %esp,%ebp

        pushl   %ebx

        pushl   %esi

        pushl   %edi

try_again:

        movl    $0x41a,%eax

        call    dosmemsetup

        movzwl  %gs:(%eax),%ebx

        movzwl  %gs:2(%eax),%ecx

        cmp     %ebx,%ecx

        je      key_not_hit

        movb    $0x11,%ah

        int     $0x16

        jz      key_not_hit

        cmp     $0,%eax

        jne     key_hit

        movb    $0x10,%ah

        int     $0x16

        jmp     try_again

key_not_hit:

        movl    $0,%eax

        jmp     L1

key_hit:

        movl    $1,%eax

L1:

        popl    %edi

        popl    %esi

        popl    %ebx

        leave

        ret