FENIX_kernel/arch/i386/tty.c
2021-01-06 15:28:36 -06:00

82 lines
1.9 KiB
C
Executable file

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <kernel/tty.h>
#include "vga.h"
static const size_t VGA_WIDTH = 80;
static const size_t VGA_HEIGHT = 24;
static uint16_t* const VGA_MEMORY = (uint16_t*) 0xB8000 ;
static size_t term_row;
static size_t term_col;
static uint8_t term_color;
static uint16_t* term_buf;
void term_init(void) {
term_row = 0;
term_col = 0;
term_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
term_buf = VGA_MEMORY;
for(size_t y = 0; y < VGA_HEIGHT; y++) {
for(size_t x = 0; x < VGA_WIDTH; x++) {
const size_t ind = y * VGA_WIDTH + x;
term_buf[ind] = vga_entry(' ', term_color);
}
}
}
void term_scroll(void) {
for(size_t y = 0; y < VGA_HEIGHT; y++) {
for(size_t x = 0; x < VGA_WIDTH; x++) {
const size_t ind = y * VGA_WIDTH + x;
term_buf[ind] = term_buf[(y+1) * VGA_WIDTH + x];
}
}
for(size_t x = 0; x < VGA_WIDTH; x++) {
const size_t ind = VGA_HEIGHT * VGA_WIDTH + x;
term_buf[ind] = vga_entry(' ', term_color);
}
}
void term_setcolor(uint8_t fg, uint8_t bg) {
term_color = vga_entry_color(fg, bg);
}
void term_putentryat(unsigned char c, uint8_t color, size_t x, size_t y) {
const size_t ind = y * VGA_WIDTH + x;
term_buf[ind] = vga_entry(c, color);
}
void term_putc(char c) {
unsigned char uc = c;
if(term_row > VGA_HEIGHT) {
term_scroll();
term_row--;
}
switch(uc) {
case '\n': term_row++; term_col = 0; break;
default: term_putentryat(uc, term_color, term_col, term_row); break;
}
if(uc != '\n' && ++term_col == VGA_WIDTH) {
term_col = 0;
if(++term_row == VGA_HEIGHT) {
term_scroll();
}
}
}
void term_write(const char* str, size_t size) {
for(size_t i = 0; i < size; i++) {
term_putc(str[i]);
}
}
void term_writestr(const char* str) {
term_write(str, strlen(str));
}