/* diskex1.c
*/

#include<stdio.h>
#include<string.h>
#define RECSIZE 21

int begin(char* dest, char* src);
int process(char* dest, char* src);
int finish(char* dest, char* src);

static FILE *output;
static int write_count = 0;
struct {                    /* struct for customer data */
       char  number[5];
       char  name[30];
       } customer [9];

int begin(char* d, char* s)
{
	output = fopen("diskex1.dat","w");
	if (output == NULL)
	{
		strcpy(d, "File open ERROR ");
		return 0;
	}
	else
	{
		strcpy(d,"File opened SUCCESSFULLY ");
		return 0;
	}
	*s=NULL;
	return 0;
}

int finish(char* d, char* s)
{
	fclose(output);
	sprintf(d,"File closed successfully %d records written", write_count);
	*s=NULL;
	return 0;
}

int process(char* d, char* s)
{
	int rcount = 1;
	int acount = 0;
	char temp[RECSIZE] = "";

	if (strlen(s) > RECSIZE -1)
	{
		strcpy(d, "Data too long ...: ");
		strcat(d, s);
		return 0;
	}

	strcpy(temp, s);

	acount = fwrite(temp, sizeof(temp), rcount, output);
	if (acount != rcount)
	{
		strcpy(d, "Error writing record: ");
		strcat(d, temp);
		return 0;
	}
	strcpy(d, "Record written successfully");
	write_count++;
	return 0;
}