On 09/03/2005 10:16 am, raphael wrote:
> I would like to know how i can manage to read the entry
> on the keyboard without using C functions like scanf or get.
You can use kernel calls. The keyboard operates in two
modes and you need to select the mode first.
In raw mode each key press is provided. In cooked mode
a whole line of data is provided when <enter> key pressed.
There are lots of examples, but the code looks like this:
1. select mode, save previous mode
2. wait for key press
3. restore mode
Here is some code from asmlib. It shows handling of multi
byte keys and the mouse. This is probably does more than
you want, but may be useful.
[section .text]
extern raw_set2
extern raw_unset2
extern kbuf
extern key_poll
extern mouse_check
extern poll_rtn
extern kbuf_end
extern key_flush
; read_stdin - read stdin data to "kbuf"
; INPUTS
; none
; OUTPUT
; kbuf - contains keys read with zero termination
; NOTES
; source file: read_stdin.asm
;
; read_stdin calls raw_set2 to put keyboard in raw
; mode. It then reads data to "kbuf" and calls
; "raw_unset2 to restore terminal state.
;
global read_stdin
read_stdin:
call raw_set2 ;set raw mode and save previous mode
km_10:
mov ecx,kbuf
more_keys:
mov eax,3 ;kernel read call
mov edx,1 ;read one byte
mov ebx,0 ;read stdin
int 80h
or eax,eax
js km_15
add ecx,eax ;advance buffer ptr
call key_poll
test byte [poll_rtn],8 ;check for error
jz km_20
km_15:
call key_flush
jmp short km_10
km_20:
cmp ecx,kbuf_end
je k_exit ;exit if buffer full
test byte [poll_rtn],1
jnz more_keys
k_exit:
mov byte [ecx],0 ;terminate string
call mouse_check ;check if mouse data read
call raw_unset2
ret
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