hippOS/gfx/terminal.c

#include "gfx/terminal.h"
#include "std/std.h"

size_t terminal_row;
size_t terminal_column;
uint8_t terminal_color;
uint16_t* terminal_buffer;
 
void terminal_initialize(void) {
    terminal_row = 0;
    terminal_column = 0;
    terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
    terminal_buffer = (uint16_t*) 0xB8000;
    for (size_t y = 0; y < VGA_HEIGHT; y++) {
        for (size_t x = 0; x < VGA_WIDTH; x++) {
            const size_t index = y * VGA_WIDTH + x;
            terminal_buffer[index] = vga_entry(' ', terminal_color);
        }
    }
}
 
void terminal_setcolor(uint8_t color) {
    terminal_color = color;
}
 
void terminal_putentryat(char c, uint8_t color, size_t x, size_t y) {
    const size_t index = y * VGA_WIDTH + x;
    terminal_buffer[index] = vga_entry(c, color);
}
 
void terminal_putchar(char c) {
    switch (c) {
        case '\r':
            terminal_column = 0;
            break;
        case '\n':
            terminal_column = 0;
            terminal_row++;
            break;
        default:
            terminal_putentryat(c, terminal_color, terminal_column, terminal_row);
            if (++terminal_column == VGA_WIDTH) {
                terminal_column = 0;
                if (++terminal_row == VGA_HEIGHT)
                    terminal_row = 0;
            }
    }
}
 
void terminal_write(const char* data, size_t size) {
    for (size_t i = 0; i < size; i++)
        terminal_putchar(data[i]);
}
 
void terminal_writestring(const char* data) {
    terminal_write(data, strlen(data));
}