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#include "vga.h"
#include <kernel/tty.h>
#include <kernel/string.h>
#include <stddef.h>
#include <stdint.h>
static const size_t VGA_WIDTH = 80;
static const size_t VGA_HEIGHT = 25;
static uint16_t *const VGA_MEMORY = (uint16_t*)0xB8000;
static size_t terminal_row;
static size_t terminal_column;
static uint8_t terminal_color;
static uint16_t *terminal_buffer;
void tty_init(void) {
terminal_row = 0;
terminal_column = 0;
terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
terminal_buffer = VGA_MEMORY;
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 tty_setcolor(uint8_t color) {
terminal_color = color;
}
void tty_putentryat(unsigned 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 terminal_scroll(void) {
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 tty_putchar(char c) {
unsigned char uc;
uc = c;
switch (uc) {
case '\n':
terminal_column = 0;
if (++terminal_row == VGA_HEIGHT) {
terminal_row--;
terminal_scroll();
}
break;
default:
tty_putentryat(uc, terminal_color, terminal_column, terminal_row);
if (++terminal_column == VGA_WIDTH) {
terminal_column = 0;
if (++terminal_row == VGA_HEIGHT) {
terminal_row--;
terminal_scroll();
}
}
break;
}
}
void tty_write(const char *data, size_t size) {
for (size_t i = 0; i < size; i++)
tty_putchar(data[i]);
}
void tty_writestring(const char *data) {
tty_write(data, strlen(data));
}
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