newlib-cygwin/newlib/libc/sys/go32/kbhit.s

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2000-02-18 03:39:52 +08:00
/* This is file KBHIT.S */
/*
** Copyright (C) 1993 DJ Delorie
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**
** This file is distributed under the terms listed in the document
** "copying.dj".
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** 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