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#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <arch.h>
#include <print.h>
#include "drivers/vga.h"
#include "term.h"
uint16_t buffer[TERM_W * TERM_H * sizeof(uint16_t)];
uint8_t x, y;
uint8_t color;
const uint16_t blank = (uint16_t) 0 | VGA_BLACK << 12 | VGA_WHITE << 8;
static void term_clear_line(int y) {
if (y < 0 || y >= TERM_H)
return;
for (uint8_t x = 0; x < TERM_W; x++) {
const size_t index = y * TERM_W + x;
buffer[index] = blank;
}
}
void term_init (void) {
x = 0;
y = 0;
term_setfg(VGA_WHITE);
term_setbg(VGA_BLACK);
term_clear();
}
void term_setpos(uint8_t xp, uint8_t yp) {
x = xp;
y = yp;
vgatext_cur_mov(x, y);
}
void term_scroll (int lines) {
arch_disable_int();
y -= lines;
if (!lines) return;
if(lines >= TERM_H || lines <= -TERM_H) {
term_clear();
} else if(lines > 0) {
memmove(buffer, buffer + lines * TERM_W, 2 * (TERM_H - lines) * TERM_W);
term_clear_line(TERM_H - lines);
} else {
memmove(buffer + lines * TERM_W, buffer + lines, (TERM_H + lines) * TERM_W);
}
arch_enable_int();
}
void term_setfg(enum vga_color c) {
color = (color & 0xF0) | c;
}
void term_setbg(enum vga_color c) {
color = (color & 0x0F) | c << 4;
}
void term_clear (void) {
for (uint8_t y = 0; y < TERM_H; y++)
term_clear_line(y);
}
uint32_t term_save(void) {
uint32_t state = 0;
state |= (uint32_t) x << 16;
state |= (uint32_t) y << 8;
state |= (uint32_t) color << 0;
return state;
}
void term_load(uint32_t state) {
x = (uint8_t) (state >> 16);
y = (uint8_t) (state >> 8);
color = (uint8_t) (state >> 0);
vgatext_cur_mov(x, y);
}
uint16_t term_save_col(void) {
return color;
}
void term_load_col(uint16_t c) {
color = c;
}
void putchar(int c) {
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: {
const size_t index = y * TERM_W + x;
buffer[index] = c | (uint16_t) color << 8;
x++;
}
}
if (x >= TERM_W) {
x = 0;
y++;
}
if (y >= TERM_H) {
term_scroll(y - (TERM_H - 1));
y = TERM_H - 1;
}
vgatext_cur_mov(x, y);
}
bool term_newline(void) {
return x == 0;
}
void term_flush(void) {
arch_disable_int();
vgatext_write_buf(buffer);
arch_enable_int();
}
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