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#include <assert.h>
#include <fcntl.h>
#include <json.h>
#include <libgui.h>
#include <poll.h>
#include <pty.h>
#include <socket.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define TERM_BACKGROUND 0x000000
int cmdfd;
GUI_Window *global_w;
uint32_t screen_pos_x = 0;
uint32_t screen_pos_y = 0;
int serial_fd;
void execsh(void) {
char *argv[] = {NULL};
execv("/sh", argv);
}
uint32_t cursor_pos_x = 0;
uint32_t cursor_pos_y = 0;
void screen_remove_old_cursor() {
GUI_OverwriteFont(global_w, cursor_pos_x, cursor_pos_y, TERM_BACKGROUND);
}
void screen_update_cursor() {
GUI_OverwriteFont(global_w, screen_pos_x, screen_pos_y, 0xFFFFFF);
cursor_pos_x = screen_pos_x;
cursor_pos_y = screen_pos_y;
}
void screen_putchar(uint32_t c) {
if (c == '\n') {
screen_pos_x = 0;
screen_pos_y += 8;
screen_remove_old_cursor();
screen_update_cursor();
return;
}
if (screen_pos_y > global_w->sy - 8) {
uint8_t line[global_w->sx * sizeof(uint32_t)];
for (int i = 0; i < global_w->sy - 8; i++) {
memcpy(line, global_w->bitmap_ptr + ((i + 8) * global_w->sx),
global_w->sx * sizeof(uint32_t));
memcpy(global_w->bitmap_ptr + (i * global_w->sx), line,
global_w->sx * sizeof(uint32_t));
}
for (int i = 0; i < global_w->sx; i += 8) {
GUI_OverwriteFont(global_w, i, screen_pos_y - 8, TERM_BACKGROUND);
}
screen_pos_x = 0;
screen_pos_y -= 8;
}
GUI_DrawFont(global_w, screen_pos_x, screen_pos_y, c);
screen_pos_x += 8;
if (screen_pos_x >= global_w->sx - 8) {
screen_pos_x = 0;
screen_pos_y += 8;
}
screen_update_cursor();
}
void screen_delete_char(void) {
GUI_OverwriteFont(global_w, screen_pos_x, screen_pos_y, TERM_BACKGROUND);
screen_pos_x -= 8;
GUI_OverwriteFont(global_w, screen_pos_x, screen_pos_y, TERM_BACKGROUND);
screen_update_cursor();
}
void screen_print(const unsigned char *s, int l) {
for (; l; l--, s++) {
if ('\b' == *s) {
screen_delete_char();
continue;
}
screen_putchar((uint32_t)*s);
}
}
void newtty(void) {
int m;
int s;
openpty(&m, &s, NULL, NULL, NULL);
int pid = fork();
if (0 == pid) {
dup2(s, 0);
dup2(s, 1);
dup2(s, 2);
execsh();
return;
}
close(s);
cmdfd = m;
}
void writetty(const char *b, size_t len) {
write(serial_fd, b, len);
for (int rc; len; len -= rc) {
rc = write(cmdfd, b, len);
if (-1 == rc) {
perror("write");
assert(0);
}
}
}
void run() {
char buffer[4096];
struct pollfd fds[2];
fds[0].fd = cmdfd;
fds[0].events = POLLIN;
fds[0].revents = 0;
fds[1].fd = global_w->ws_socket;
fds[1].events = POLLIN;
fds[1].revents = 0;
for (;; fds[0].revents = fds[1].revents = 0) {
poll(fds, 2, 0);
if (fds[0].revents & POLLIN) {
int rc;
if ((rc = read(cmdfd, buffer, 4096))) {
screen_print(buffer, rc);
GUI_UpdateWindow(global_w);
}
}
if (fds[1].revents & POLLIN) {
WS_EVENT e;
int rc;
if (0 >= (rc = read(global_w->ws_socket, &e, sizeof(e))))
continue;
if (1 == e.ev.release)
continue;
if (0 == e.ev.c)
continue;
write(cmdfd, &e.ev.c, 1);
}
}
}
int main(void) {
open("/dev/serial", O_RDWR, 0);
open("/dev/serial", O_RDWR, 0);
global_w = GUI_CreateWindow(20, 20, 250 * 4, 150 * 4);
assert(global_w);
for (int i = 0; i < 250 * 150 * 4 * 4; i++)
global_w->bitmap_ptr[i] = TERM_BACKGROUND;
// memset(global_w->bitmap_ptr, 0x0, 50 * 50);
GUI_UpdateWindow(global_w);
newtty();
run();
return 0;
}
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