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#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <arch/i386/tmtty.h>
#include "vga.h"
/* Text mode tty */
static const size_t VGA_WIDTH = 80;
static const size_t VGA_HEIGHT = 25;
static uint16_t* const VGA_MEMORY = (uint16_t*) 0xB8000;
size_t terminal_row;
size_t terminal_column;
uint8_t terminal_color;
uint16_t* terminal_buffer;
void terminal_clear(void) {
terminal_row = 0;
terminal_column = 0;
for (size_t y = 0; y < VGA_HEIGHT; y++) {
for (size_t x = 0; x < VGA_WIDTH; x++) {
const size_t i = y * VGA_WIDTH + x;
terminal_buffer[i] = vga_entry(' ', terminal_color);
}
}
}
void terminal_initialize(void) {
terminal_color = vga_entry_color(VGA_COLOR_WHITE, VGA_COLOR_BLACK);
terminal_buffer = VGA_MEMORY;
terminal_clear();
}
void terminal_setcolor(uint8_t color) {
terminal_color = color;
}
void terminal_putentryat(char c, uint8_t color, size_t x, size_t y) {
const size_t i = y * VGA_WIDTH + x;
terminal_buffer[i] = vga_entry(c, color);
}
void terminal_scroll() {
memmove(VGA_MEMORY, (VGA_MEMORY + VGA_WIDTH), (VGA_HEIGHT * VGA_WIDTH) - VGA_WIDTH);
memset(VGA_MEMORY + (VGA_WIDTH * VGA_HEIGHT) - VGA_WIDTH, 0x0, VGA_WIDTH * 2);
--terminal_row;
}
void terminal_putchar(char c) {
unsigned char uc = c;
if (uc == '\n') {
terminal_column = 0;
if (terminal_row++ == VGA_HEIGHT)
terminal_scroll();
return;
}
terminal_putentryat(uc, terminal_color, terminal_column, terminal_row);
if (++terminal_column == VGA_WIDTH) {
terminal_column = 0;
if (++terminal_row == VGA_HEIGHT) {
terminal_scroll();
}
}
}
void terminal_write(const char* data, size_t size) {
for (size_t i = 0; i < size; i++) {
terminal_putchar(data[i]);
}
}
void terminal_writestring(const char* data) {
terminal_write(data, strlen(data));
}
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