112 lines
3.4 KiB
C
112 lines
3.4 KiB
C
/**
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* TTY section header of rockOS
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* Copyright (C) 2022 Furkan Mudanyali
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, _either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#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 <rockos/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 uint16_t* const VGA_OLDMEMORY = (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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static uint16_t* terminal_oldbuffer;
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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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terminal_oldbuffer = VGA_OLDMEMORY;
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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 scroll_screen_fwd() {
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memcpy(terminal_oldbuffer, &terminal_buffer[VGA_WIDTH], (VGA_HEIGHT*2-1) * VGA_WIDTH);
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for(size_t x = 0; x < VGA_WIDTH; ++x) {
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terminal_oldbuffer[(VGA_HEIGHT-1)*VGA_WIDTH + x] = vga_entry(' ', terminal_color);
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}
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memcpy(terminal_buffer, terminal_oldbuffer, VGA_HEIGHT*VGA_WIDTH);
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--terminal_row;
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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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switch(uc) {
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case '\n':
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terminal_column = 0;
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if (++terminal_row == VGA_HEIGHT)
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scroll_screen_fwd();
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break;
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case 0x08:
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if(!terminal_column & !terminal_row)
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return;
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if(--terminal_column == 0) {
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terminal_column = VGA_WIDTH;
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if(--terminal_row == 0) {
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terminal_row =VGA_HEIGHT;
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}
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}
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terminal_putentryat(' ', terminal_color, terminal_column, terminal_row);
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break;
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default:
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terminal_putentryat(uc, terminal_color, terminal_column, terminal_row);
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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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scroll_screen_fwd();
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}
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}
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break;
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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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}
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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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