83 lines
1.9 KiB
C
Executable File
83 lines
1.9 KiB
C
Executable File
#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 = 24;
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static uint16_t* const VGA_MEMORY = (uint16_t*) 0xC03FF000 ;
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static size_t term_row;
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static size_t term_col;
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static uint8_t term_color;
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static uint16_t* term_buf;
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void term_init(void) {
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term_row = 0;
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term_col = 0;
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term_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
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term_buf = 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 ind = y * VGA_WIDTH + x;
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term_buf[ind] = vga_entry(' ', term_color);
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}
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}
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}
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void term_scroll(void) {
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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 ind = y * VGA_WIDTH + x;
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term_buf[ind] = term_buf[(y+1) * VGA_WIDTH + x];
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}
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}
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for(size_t x = 0; x < VGA_WIDTH; x++) {
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const size_t ind = VGA_HEIGHT * VGA_WIDTH + x;
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term_buf[ind] = vga_entry(' ', term_color);
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}
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}
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void term_setcolor(uint8_t fg, uint8_t bg) {
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term_color = vga_entry_color(fg, bg);
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}
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void term_putentryat(unsigned char c, uint8_t color, size_t x, size_t y) {
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const size_t ind = y * VGA_WIDTH + x;
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term_buf[ind] = vga_entry(c, color);
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}
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void term_putc(char c) {
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unsigned char uc = c;
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if(term_row > VGA_HEIGHT) {
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term_scroll();
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term_row--;
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}
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switch(uc) {
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case '\n': term_row++; term_col = 0; break;
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default: term_putentryat(uc, term_color, term_col, term_row); break;
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}
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if(uc != '\n' && ++term_col == VGA_WIDTH) {
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term_col = 0;
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if(++term_row == VGA_HEIGHT) {
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term_scroll();
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}
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}
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}
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void term_write(const char* str, size_t size) {
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for(size_t i = 0; i < size; i++) {
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term_putc(str[i]);
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}
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}
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void term_writestr(const char* str) {
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term_write(str, strlen(str));
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}
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