/**********
 * Polprog 2018
 * 3 clause BSD licence
 * http://polprog.net
 */
#include <sys/ioctl.h>
#include <termios.h>
#include "util.h"


int open_port(char *devname){
	int fd;
	fd = open(devname, O_RDWR | O_NOCTTY | O_NDELAY); //open rw, not a controlling terminal, ignore DCD
	if(fd < 0){
		fprintf(stderr, "Cannot open %s: %s\n", devname, strerror(errno));
		return fd;
	}
	return fd;
  
}


bool write_chars(int fd, char *data){

	int dtr_flag = TIOCM_DTR;
	//printf("Writing %s; len=%d\n", data, strlen(data));
	ioctl(fd, TIOCMBIC, &dtr_flag);
	usleep(10000);
	int status = write(fd, data, strlen(data));
	tcdrain(fd);
	usleep(10000);

	ioctl(fd, TIOCMBIS, &dtr_flag);
	//	printf("Written %s; len=%d\n", data, strlen(data));
	if(status < 0){
		fprintf(stderr, "Cannot write data to port: %s\n", strerror(errno));
		return false;
	}
	return true;
}

char *read_line(int fd, char *buf){
  
	int pos = 0;
	while(true){
		int status = read(fd, buf+pos, 1);
		if(status == -1) {
			if(errno == EAGAIN || errno == EWOULDBLOCK){
				//End of data
				*(buf+pos) = 0; //Null terminate the string
				break;
			}else{
				fprintf(stderr, "Error while reading: %s\n", strerror(errno));
				break;
			}
		}
		if(*(buf+pos) == '\n') {
			//Received end of line
			*(buf+pos) = 0; //Null terminate the string
			break;
		}
		pos++;
	}
	return buf;
}



void set_rts(int fd){
	int flag = TIOCM_RTS;
	ioctl(fd, TIOCMBIS, &flag);
}


void clr_rts(int fd){
	int flag = TIOCM_RTS;
	ioctl(fd, TIOCMBIC, &flag);
}




void set_dtr(int fd){
	int flag = TIOCM_DTR;
	ioctl(fd, TIOCMBIS, &flag);
}


void clr_dtr(int fd){
	int flag = TIOCM_DTR;
	ioctl(fd, TIOCMBIC, &flag);
}