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#include<types.h>
#include<asm.h>
#include<stdio.h>
#define BUFFER_SIZE 200
#define BUFFER_LOG 200
char buffer[BUFFER_LOG][BUFFER_SIZE];
size_t buffer_size[BUFFER_LOG];
size_t buffer_current=0;
size_t buffer_all=0;
size_t buffer_index=0;
#define PIC1_COMMAND_PORT 0x20
#define PIC1_DATA_PORT 0x21
#define PIC2_COMMAND_PORT 0xA0
#define PIC2_DATA_PORT 0xA1
// IO Ports for Keyboard
#define KEYBOARD_DATA_PORT 0x60
#define KEYBOARD_STATUS_PORT 0x64
void previous_field(void);
void tty(char *buffer);
void prompt(void);
void clear();
void us_en(char keymap[]);
void us_en_shift(char keymap[]);
char charcode[256];
char shift_charcode[256];
bool ispressed[128];
#define lshift 0x2A
#define rshift 0x36
#define lctrl 0x1D
#define rctrl 0x1D
void init_keyboard()
{
us_en(charcode);
us_en_shift(shift_charcode);
}
void deletelast()
{
previous_field();
printf(" ");
previous_field();
}
void backspace()
{
if(buffer_index<=0) return;
deletelast();
buffer[buffer_current][--buffer_index]='\0';
return;
}
void enter()
{
printf("\n");
if(buffer_index>0)
{
tty(buffer[buffer_current]);
buffer_size[buffer_current]=buffer_index;
if(buffer_current==buffer_all) buffer_current=(++buffer_all);
else
{
for(size_t i=0;i<BUFFER_SIZE;i++) buffer[buffer_all][i]='\0';
buffer_current=buffer_all;
}
buffer_index=0;
}
prompt();
return;
}
void space()
{
buffer[buffer_current][buffer_index++]=' ';
printf(" ");
}
void keyup()
{
if(buffer_current>0)
{
buffer_size[buffer_current]=buffer_index;
for(size_t i=0;i<buffer_index;i++) deletelast();
buffer_current--;
buffer_index=buffer_size[buffer_current];
printf("%s",buffer[buffer_current]);
}
}
void keydown()
{
if(buffer_current<buffer_all)
{
buffer_size[buffer_current]=buffer_index;
for(size_t i=0;i<buffer_index;i++) deletelast();
buffer_current++;
buffer_index=buffer_size[buffer_current];
printf("%s",buffer[buffer_current]);
}
}
void keyleft()
{
}
void keyright()
{
}
void keyboard_handler()
{
ioport_out(PIC1_COMMAND_PORT, 0x20);
uint8_t status = ioport_in(KEYBOARD_STATUS_PORT);
if (status & 0x1)
{
uint8_t keycode = ioport_in(KEYBOARD_DATA_PORT);
if(keycode<0x80)
{
char c=charcode[keycode];
ispressed[keycode]=1;
// printf("%d ",&keycode);
switch(keycode)
{
case 0x0E:
backspace();
break;
case 0x1C:
enter();
break;
case 0x39:
space();
break;
case 72:
keyup();
break;
case 80:
keydown();
break;
case 75:
keyleft();
break;
case 77:
keyright();
break;
default:
if(c!=' ')
{
if(ispressed[lctrl]||ispressed[rctrl])
{
if(c=='l')
{
clear();
prompt();
printf("%s",buffer[buffer_current]);
return;
}
}
if(ispressed[lshift]||ispressed[rshift])
{
c=shift_charcode[keycode];
}
buffer[buffer_current][buffer_index++]=c;
printf("%c",c);
}
break;
}
}
else
{
ispressed[keycode-0x80]=0;
}
}
}
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