/*
*Scale5  Write data to Serial Port and Read it
*
*/ 
#include <termios.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

#define MODEMDEVICE "/dev/ttyS0"


int main(void) 
{
        char buf[64];
        int pos=0, num, num2,num3;
		FILE *fp1, *fp2;   


        int fd, i, n3;

		fp2 = fopen("/var/www/testfile.txt", "w+");

		fp1 = fopen(MODEMDEVICE, "w+");

		if(fp1 == NULL)
		{
			printf("initiation error. \n");
	        return 1;
	    }
	


		fp2 = fopen("/var/www/testfile.txt", "r+");

		fprintf(fp1, "%s","W\r\n");
	

		fread(buf, 1, 7,fp1 );
		n3 =strlen(buf);
		printf("\n%s    %d", "stringn3  ", n3);
		printf("buffer elements\n");

		for(i= 0; i < strlen(buf) ; i++)
		printf("%c", buf[i]);

		printf("You entered the string %s\n",buf);

	
		rewind(fp2);

		fwrite(buf, 1, 7,fp2 );
		fclose(fp2);

}