99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
#include "console.h"
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#include "portmap.h"
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#include <stdint.h>
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const int VGA_WIDTH = 80;
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const int VGA_HEIGHT = 25;
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const int VGA_BYTES_PER_CHARACTER = 2;
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char* const VGA_BUFFER = (char*) 0xb8000;
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static int terminal_position = 0;
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static VGA_Color terminal_font_color = LIGHT_GRAY; // Default font color will be light gray
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static VGA_Color terminal_background_color = BLACK; // Default background color is black
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void set_terminal_font_color(VGA_Color col) {
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terminal_font_color = col;
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}
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void set_terminal_background_color(VGA_Color col) {
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terminal_background_color = col;
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}
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void clear_terminal() {
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for (int i=0; i<(VGA_WIDTH * VGA_HEIGHT); i++) {
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// Text byte gets nulled
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VGA_BUFFER[i*2] = '\0';
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// Style byte gets 0x07 for white text on a black background?
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VGA_BUFFER[i*2 + 1] = 0x07;
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}
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}
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void print_character(char c) {
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print_character_with_color(c, terminal_background_color, terminal_font_color);
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}
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void print_character_with_color(char c, VGA_Color bg, VGA_Color fg) {
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if (c == '\n') {
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terminal_position = (terminal_position + ((VGA_BYTES_PER_CHARACTER / 2 * VGA_WIDTH)) - (terminal_position % (VGA_BYTES_PER_CHARACTER / 2 * VGA_WIDTH)));
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} else if (c == '\b') {
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terminal_position -= 1;
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VGA_BUFFER[(terminal_position * VGA_BYTES_PER_CHARACTER)] = ' ';
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int full_color = (bg << 4) | fg;
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VGA_BUFFER[(terminal_position * VGA_BYTES_PER_CHARACTER) + 1] = full_color;
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} else {
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VGA_BUFFER[(terminal_position * VGA_BYTES_PER_CHARACTER)] = c;
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int full_color = (bg << 4) | fg;
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VGA_BUFFER[(terminal_position * VGA_BYTES_PER_CHARACTER) + 1] = full_color;
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terminal_position++;
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}
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update_cursor();
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}
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void print_string(char* string) {
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print_string_with_color(string, terminal_background_color, terminal_font_color);
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}
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void print_string_with_color(char* string, VGA_Color bg, VGA_Color fg) {
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for (int i=0; string[i] != '\0'; i++) {
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print_character_with_color(string[i], bg, fg);
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}
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}
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void print_line(char* string) {
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print_string(string);
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print_character('\n');
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}
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void print_line_with_color(char* string, VGA_Color bg, VGA_Color fg) {
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print_string_with_color(string, bg, fg);
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print_character('\n');
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}
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void update_cursor() {
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uint16_t cursor_position = terminal_position >> 0;
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outb(0x3D4, 0x0F);
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outb(0x3D5, (uint8_t) (cursor_position));
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outb(0x3D4, 0x0E);
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outb(0x3D5, (uint8_t) (cursor_position >> 8));
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} |