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#include"types.h"
#include"string.h"
#include"asm.h"
static const size_t VGA_WIDTH = 80;
static const size_t VGA_HEIGHT = 25;
enum vga_color {
VGA_COLOR_BLACK = 0,
VGA_COLOR_BLUE = 1,
VGA_COLOR_GREEN = 2,
VGA_COLOR_CYAN = 3,
VGA_COLOR_RED = 4,
VGA_COLOR_MAGENTA = 5,
VGA_COLOR_BROWN = 6,
VGA_COLOR_LIGHT_GREY = 7,
VGA_COLOR_DARK_GREY = 8,
VGA_COLOR_LIGHT_BLUE = 9,
VGA_COLOR_LIGHT_GREEN = 10,
VGA_COLOR_LIGHT_CYAN = 11,
VGA_COLOR_LIGHT_RED = 12,
VGA_COLOR_LIGHT_MAGENTA = 13,
VGA_COLOR_LIGHT_BROWN = 14,
VGA_COLOR_WHITE = 15,
};
static inline uint8_t vga_entry_color(enum vga_color fg, enum vga_color bg)
{
return fg | bg << 4;
}
static inline uint16_t vga_entry(unsigned char uc, uint8_t color)
{
return (uint16_t) uc | (uint16_t) color << 8;
}
size_t terminal_row;
size_t terminal_column;
uint8_t terminal_color;
uint16_t* terminal_buffer;
void terminal_initialize()
{
terminal_row=0;
terminal_column=0;
terminal_color=vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
terminal_buffer=(uint16_t*) 0xB8000;
for(size_t y=0;y<VGA_HEIGHT;y++)
{
for(size_t x=0;x<VGA_WIDTH;x++)
{
const size_t index=y*VGA_WIDTH+x;
terminal_buffer[index]=vga_entry(' ', terminal_color);
}
}
}
void terminal_putentryat(char c, uint8_t color, size_t x, size_t y)
{
const size_t index=y*VGA_WIDTH+x;
terminal_buffer[index]=vga_entry(c, color);
}
void movescreen()
{
terminal_row--;
for(size_t i=0;i<VGA_HEIGHT;i++) for(size_t j=0;j<VGA_WIDTH;j++) terminal_buffer[i*VGA_WIDTH+j]=terminal_buffer[(i+1)*VGA_WIDTH+j];
}
void next_field()
{
if(++terminal_column==VGA_WIDTH) terminal_column=0,terminal_row++;
}
void previous_field()
{
if(terminal_column) terminal_column--;
else terminal_row--,terminal_column=VGA_WIDTH-1;
}
void terminal_putchar(char c)
{
if(c=='\n') terminal_column=0,terminal_row++;
else
{
terminal_putentryat(c, terminal_color, terminal_column, terminal_row);
next_field();
}
if (terminal_row==VGA_HEIGHT) movescreen();
}
void terminal_writestring(char* data)
{
for(int i=0;data[i]!='\0';i++) terminal_putchar(data[i]);
}
void terminal_writeint(uint32_t num)
{
char string[100];
for(int i=0;i<100;i++) string[i]='\0';
char *str=string;
itos(num,str);
terminal_writestring(str);
}
void terminal_writefloat(double num)
{
char string[100];
for(int i=0;i<100;i++) string[i]='\0';
char *str=string;
ftos(num,str);
terminal_writestring(str);
}
void prompt()
{
terminal_writestring("[user@myos] > ");
}
void clear()
{
for(size_t i=0;i<VGA_HEIGHT;i++) for(size_t j=0;j<VGA_WIDTH;j++) terminal_putchar(' ');
terminal_column=0;
terminal_row=0;
}
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