#define _DEFAULT_SOURCE 1

#include <termios.h>
#include <stdio.h>

#include "serial.h"

int set_terminal_attributes(int fd)
{
  int ret;
  struct termios tty;
  ret = tcgetattr(fd, &tty);
  if (ret == -1) {
    perror("tcgetattr");
    return -1;
  }

  tty.c_cflag &= ~PARENB; // no parity
  tty.c_cflag &= ~CSTOPB; // one stop bit
  tty.c_cflag &= ~CSIZE; // clear size bits
  tty.c_cflag |= CS8; // 8 bit
  tty.c_cflag &= ~CRTSCTS; // disable RTS/CTS hardware flow control
  tty.c_cflag |= CREAD | CLOCAL; // turn on READ & ignore ctrl lines

  tty.c_lflag &= ~ICANON;
  tty.c_lflag &= ~ECHO; // disable echo
  tty.c_lflag &= ~ECHOE; // disable erasure
  tty.c_lflag &= ~ECHONL; // disable new-line echo
  tty.c_lflag &= ~ISIG; // disable interpretation of INTR, QUIT and SUSP

  tty.c_iflag &= ~(IXON|IXOFF|IXANY); // turn off xon/xoff ctrl
  tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL); // disable any special handling of received bytes

  tty.c_oflag &= ~OPOST; // prevent special interpretation of output bytes (e.g. newline chars)
  tty.c_oflag &= ~ONLCR; // prevent conversion of newline to carriage return/line feed

  tty.c_cc[VMIN] = 1;
  tty.c_cc[VTIME] = 0;

  cfsetospeed(&tty, B1200);
  cfsetispeed(&tty, B1200);

  ret = tcsetattr(fd, TCSANOW, &tty);
  if (ret == -1) {
    perror("tcsetattr");
    return -1;
  }

  return 0;
}