/*Non-Canonical Input Processing*/

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <stdio.h>

#define BAUDRATE B38400
#define MODEMDEVICE "/dev/ttyS1"
#define _POSIX_SOURCE 1 /* POSIX compliant source */
#define FALSE 0
#define TRUE 1

volatile int STOP=FALSE;

int main(int argc, char** argv)
{
    int fd,c, res;
    struct termios oldtio,newtio;
    char buf[255];
    char buf2[255];
    int i, sum = 0, speed = 0;

    if ( (argc < 2) ||
  	     ((strcmp("/dev/ttyS0", argv[1])!=0) &&
  	      (strcmp("/dev/ttyS1", argv[1])!=0) )) {
      printf("Usage:\tnserial SerialPort\n\tex: nserial /dev/ttyS1\n");
      exit(1);
    }


  /*
    Open serial port device for reading and writing and not as controlling tty
    because we don't want to get killed if linenoise sends CTRL-C.
  */


    fd = open(argv[1], O_RDWR | O_NOCTTY );
    if (fd <0) {perror(argv[1]); exit(-1); }

    if ( tcgetattr(fd,&oldtio) == -1) { /* save current port settings */
      perror("tcgetattr");
      exit(-1);
    }

    bzero(&newtio, sizeof(newtio));
    newtio.c_cflag = BAUDRATE | CS8 | CLOCAL | CREAD;
    newtio.c_iflag = IGNPAR;
    newtio.c_oflag = 0;

    /* set input mode (non-canonical, no echo,...) */
    newtio.c_lflag = 0;

    newtio.c_cc[VTIME]    = 0;   /* inter-character timer unused */
    newtio.c_cc[VMIN]     = 5;   /* blocking read until 5 chars received */



  /*
    VTIME e VMIN devem ser alterados de forma a proteger com um temporizador a
    leitura do(s) pr�ximo(s) caracter(es)
  */



    tcflush(fd, TCIOFLUSH);

    if ( tcsetattr(fd,TCSANOW,&newtio) == -1) {
      perror("tcsetattr");
      exit(-1);
    }

    printf("New termios structure set\n");



    // for (i = 0; i < 255; i++) {
    //   buf[i] = 'a';
    // }
    //
    // /*testing*/
    // buf[25] = '\n';

    gets(buf);
    int n= strlen(buf)+1;
    res = write(fd,buf,n);
    printf("%d bytes written\n", res);


  /*
    O ciclo FOR e as instru��es seguintes devem ser alterados de modo a respeitar
    o indicado no gui�o
  */
  char* fr;
      strcpy(buf2, "");

      while (STOP==FALSE) {       /* loop for input */
        	read(fd,fr,1);   /* returns after 5 chars have been input */
        	strcat(buf2,fr);               /* so we can printf... */


        if (!strcmp(fr,"\0")) STOP=TRUE;
      }
      printf ("%s\n",buf2);



    if ( tcsetattr(fd,TCSANOW,&oldtio) == -1) {
      perror("tcsetattr");
      exit(-1);
    }





    close(fd);
    return 0;
}