forked from Bananymous/banan-os
103 lines
2.0 KiB
C
103 lines
2.0 KiB
C
#include <kernel/tty.h>
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#include "vga.h"
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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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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_col;
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static uint8_t terminal_color;
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static uint16_t* terminal_buffer;
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void terminal_putentryat(unsigned char c, uint8_t color, size_t x, size_t y)
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{
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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_clear(void)
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{
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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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terminal_putentryat(' ', terminal_color, x, y);
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}
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void terminal_initialize(void)
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{
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terminal_row = 0;
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terminal_col = 0;
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terminal_color = vga_entry_color(VGA_COLOR_WHITE, VGA_COLOR_BLACK);
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terminal_buffer = VGA_MEMORY;
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terminal_clear();
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}
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void terminal_setcolor(uint8_t color)
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{
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terminal_color = color;
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}
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void terminal_scroll_line(size_t line)
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{
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for (size_t x = 0; x < VGA_WIDTH; x++)
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{
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const size_t index = line * VGA_WIDTH + x;
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terminal_buffer[index - VGA_WIDTH] = terminal_buffer[index];
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}
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}
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void terminal_clear_line(size_t line)
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{
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for (size_t x = 0; x < VGA_WIDTH; x++)
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terminal_putentryat(' ', terminal_color, x, line);
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}
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void terminal_putchar(char c)
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{
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if (c == '\n')
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{
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terminal_col = 0;
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terminal_row++;
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}
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else
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{
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terminal_putentryat(c, terminal_color, terminal_col, terminal_row);
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terminal_col++;
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}
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if (terminal_col == VGA_WIDTH)
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{
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terminal_col = 0;
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terminal_row++;
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}
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if (terminal_row == VGA_HEIGHT)
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{
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for (size_t line = 1; line < VGA_HEIGHT; line++)
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terminal_scroll_line(line);
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terminal_clear_line(VGA_HEIGHT - 1);
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terminal_col = 0;
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terminal_row = VGA_HEIGHT - 1;
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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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{
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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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{
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size_t len = 0;
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while (data[len])
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len++;
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terminal_write(data, len);
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} |