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#include <lib.h>
#include <comus/term.h>
#include <comus/asm.h>
#include <comus/limits.h>
#include <comus/drivers/gpu.h>
// terminal data
static char buffer[TERM_MAX_WIDTH * TERM_MAX_HEIGHT];
static uint16_t buffer_line = UINT16_MAX;
static uint16_t width = 80; // baseline vga text mode until resized
static uint16_t height = 25;
static uint16_t x = 0;
static uint16_t y = 0;
#define BUFY(y) ((buffer_line + (y)) % TERM_MAX_HEIGHT)
#define BUFIDX(x, y) ((x) + (BUFY(y) * TERM_MAX_WIDTH))
static void buffer_check(void)
{
if (buffer_line == UINT16_MAX) {
buffer_line = 0;
memset(buffer, 0, sizeof(buffer));
}
}
static inline bool printable(char c)
{
switch (c) {
case '\0':
case '\n':
case '\t':
case '\v':
case '\f':
case '\r':
return false;
default:
return true;
}
}
static inline void term_move_cur(char c)
{
if (c == '\0')
return;
switch (c) {
case '\n':
x = 0;
y++;
break;
case '\t':
x += 4;
break;
case '\v':
case '\f':
y++;
break;
case '\r':
x = 0;
break;
default:
x++;
}
if (x >= width) {
x = 0;
y++;
}
if (y >= height) {
term_scroll(y - (height - 1));
y = height - 1;
}
}
uint16_t term_width(void)
{
return width;
}
uint16_t term_height(void)
{
return height;
}
void term_out(char c)
{
term_out_at(c, x, y);
term_move_cur(c);
}
void term_out_at(char c, uint16_t x, uint16_t y)
{
buffer_check();
if (!printable(c))
return;
buffer[BUFIDX(x, y)] = c;
gpu_draw_char(c, x, y);
}
void term_out_str(const char *str)
{
char c;
while (c = *(str++), c) {
term_out_at(c, x, y);
term_move_cur(c);
}
}
void term_out_str_at(const char *str, uint16_t x, uint16_t y)
{
char c;
while (c = *(str++), c)
term_out_at(c, x, y);
}
void term_clear(void)
{
for (uint16_t y = 0; y < height; y++)
term_clear_line(y);
}
void term_clear_line(uint16_t line)
{
buffer_check();
if (line > height)
return;
for (uint16_t x = 0; x < width; x++) {
buffer[BUFIDX(x, line)] = 0;
gpu_draw_char(0, x, line);
}
}
void term_redraw(void)
{
buffer_check();
for (uint16_t j = 0; j < height; j++) {
for (uint16_t i = 0; i < width; i++) {
char c = buffer[BUFIDX(i, j)];
gpu_draw_char(c, i, j);
}
}
}
void term_scroll(uint16_t lines)
{
if (!lines)
return;
buffer_line += lines;
term_redraw();
}
void term_resize(uint16_t w, uint16_t h)
{
width = w % TERM_MAX_WIDTH;
height = h % TERM_MAX_HEIGHT;
term_redraw();
}
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