90 lines
2.0 KiB
C
90 lines
2.0 KiB
C
#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <kernel/tty.h>
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#include "vga.h"
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static const size_t VGA_WIDTH = 80;
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static const size_t VGA_HEIGHT = 25;
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static uint16_t* const VGA_MEMORY = (uint16_t*) 0xB8000;
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static size_t terminal_row;
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static size_t terminal_column;
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static uint8_t terminal_color;
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static uint16_t* terminal_buffer;
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void terminal_initialize(void) {
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terminal_row = 0;
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terminal_column = 0;
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terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
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terminal_buffer = VGA_MEMORY;
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for (size_t y = 0; y < VGA_HEIGHT; y++) {
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for (size_t x = 0; x < VGA_WIDTH; x++) {
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const size_t index = y * VGA_WIDTH + x;
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terminal_buffer[index] = vga_entry(' ', terminal_color);
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}
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}
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}
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void terminal_setcolor(uint8_t color) {
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terminal_color = color;
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}
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void terminal_putentryat(unsigned char c, uint8_t color, size_t x, size_t y) {
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const size_t index = y * VGA_WIDTH + x;
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terminal_buffer[index] = vga_entry(c, color);
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}
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void terminal_scroll(int line) {
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int loop;
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int c;
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for(loop = line * (VGA_WIDTH * 2) + 0xB8000; loop < VGA_WIDTH * 2; loop++) {
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c = loop;
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//*(loop - (VGA_WIDTH * 2)) = c;
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}
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}
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void terminal_delete_last_line() {
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int x, *ptr;
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for(x = 0; x < VGA_WIDTH * 2; x++) {
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ptr = 0xB8000 + (VGA_WIDTH * 2) * (VGA_HEIGHT - 1) + x;
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*ptr = 0;
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}
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}
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void terminal_putchar(char c) {
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unsigned char uc = c;
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terminal_putentryat(uc, terminal_color, terminal_column, terminal_row);
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if (c != '\n') {
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if (++terminal_column == VGA_WIDTH) {
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terminal_column = 0;
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if (++terminal_row == VGA_HEIGHT) {
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for(int line = 1; line <= VGA_HEIGHT - 1; line++)
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{
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terminal_scroll(line);
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}
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terminal_delete_last_line();
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terminal_row = VGA_HEIGHT - 1;
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}
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}
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} else {
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terminal_row += 1;
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terminal_column = 0;
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}
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}
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void terminal_write(const char* data, size_t size) {
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for (size_t i = 0; i < size; i++)
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terminal_putchar(data[i]);
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}
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void terminal_writestring(const char* data) {
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terminal_write(data, strlen(data));
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}
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