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/*
* bubbl
* Copyright (C) 2024-2025 Raghuram Subramani <raghus2247@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <common.h>
#include <libk/stdio.h>
#include <libk/string.h>
#include <kernel/io.h>
#include <drivers/vga_text_buffer.h>
namespace VGATextBuffer
{
static uint16_t *buffer = (uint16_t *) 0xB8000;
static uint8_t row = 0;
static uint8_t column = 0;
static uint8_t color = vga_entry_color(VGATextBuffer::COLOR_LIGHT_GREY,
VGATextBuffer::COLOR_BLACK);
ALWAYS_INLINE static void
write_entry_at(const char c,
const uint8_t color,
const uint8_t x,
const uint8_t y)
{
size_t index = y * VGA_WIDTH + x;
buffer[index] = vga_entry(c, color);
}
void
initialize(void)
{
/*
* Disable the cursor
* TODO: Abstract this and all other cursor functionality out
*/
outb(0x3D4, 0x0A);
outb(0x3D5, 0x20);
for (uint8_t y = 0; y < VGA_HEIGHT; y++)
for (uint8_t x = 0; x < VGA_WIDTH; x++)
write_entry_at(' ', color, x, y);
}
void
write_char(const char c)
{
if (c == '\n') {
row++;
column = 0;
} else {
write_entry_at(c, color, column, row);
if (++column == VGA_WIDTH) {
column = 0;
if (++row == VGA_HEIGHT)
row = 0;
}
}
}
void
write_string(const char *string)
{
size_t size = strlen(string);
for (size_t i = 0; i < size; i++)
write_char(string[i]);
}
void
printf(const char *string, ...)
{
/* TODO: Dynamic Memory Allocation */
char str[256];
va_list ap;
va_start(ap, string);
vsnprintf(str, sizeof(str), string, ap);
va_end(ap);
write_string(str);
}
}
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