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- /* This is file KBHIT.S */
- /*
- ** Copyright (C) 1993 DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954
- **
- ** This file is distributed under the terms listed in the document
- ** "copying.dj", available from DJ Delorie at the address above.
- ** 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
-