DBFZ Test

dbfz.c

#include <stdio.h>
#include <string.h>

#include "dbfz.h"

record new_record(char *name, char *section, char *address)
{
    record nr;
    memset(&nr, 0, sizeof(record));
    sprintf(nr.name, "%s", name);
    sprintf(nr.address, "%s", address);
    sprintf(nr.section, "%s", section);
    return nr;
}

void write_records(record array[], int num_records)
{
    FILE *fp = fopen("file.db", "w");
    dbheader header;
    sprintf(header.magic, "%s", MAGIC);
    header.num_records = num_records;

    fwrite(&header, sizeof(dbheader), 1, fp);
    fwrite(array, sizeof(record), num_records, fp);

    fflush(fp);
    fclose(fp);
}

RESULT read_records(record array[], int* num_records)
{
    FILE *fp = fopen("file.db", "r");
    dbheader header;
    fread(&header, sizeof(dbheader), 1, fp);

    if (strcmp(header.magic, MAGIC) == 0) // check if it's the right file
        return FAIL;

    *num_records = header.num_records;

    fread(array, sizeof(record), *num_records, fp);
    fclose(fp);

    return OK;
}

dbfz.h

#ifndef DBFZ_H
#define DBFZ_H

#define MAGIC "DBFZ"
#define OK 1
#define FAIL 0
#define RESULT int

typedef struct _record
{
    char name[50];
    char section[15];
    char address[255];
} record;

typedef struct _dbheader
{
    char magic[4];
    int num_records;
} dbheader;

record new_record(char *name, char *section, char *address);
void write_records(record array[], int num_records);
RESULT read_records(record array[], int* num_records);

#endif // DBFZ_H

main.c

#include <stdio.h>
#include <stdlib.h>
#include "dbfz.h"

int main(int argc, char *argv[])
{
    record yy[4];
    int i;
	record in[255];
    int numread;
	
    yy[0] = new_record("Marilyn J. Monroe",
                       "BSCS-42E1",
                       "52 National Highway, Bayanan, Muntinlupa City");
    yy[1] = new_record("Eduard Tudor",
                       "BSCS-31A1",
                       "64 Summitville Ave., Putatan, Muntinlupa City");
    yy[2] = new_record("Lalaine B. Bagui",
                       "BSBA-32A1",
                       "6401A Commonwealth Ave., Project 8, Quezon City");
    yy[3] = new_record("Selena Luna A. Valdez",
                       "BSCS-42E1",
                       "8 India St., Better Living Subd., Don Bosco, Paranaque City");
    write_records(yy,4);

    read_records(in, &numread);

    for (i = 0; i < numread; i++)
    {
        printf("Student: %s\n", in[i].name);
        printf("Section: %s\n", in[i].section);
        printf("Address: %s\n\n", in[i].address);
    }

    return 0;
}