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

#define PN_NAME_SIZE    64
#define PN_NUM_SIZE     5

#define PN_DECLARE(X,Y)char *X=malloc(sizeof(char)*Y);memset(X,'\0',Y)

int main ()
{
        PN_DECLARE(pn, PN_NUM_SIZE);
        PN_DECLARE(fn, PN_NUM_SIZE);
        PN_DECLARE(pp, PN_NAME_SIZE);
        PN_DECLARE(fp, PN_NAME_SIZE);
        PN_DECLARE(cf, PN_NAME_SIZE);

        FILE *pfp = fopen ( "post_number.txt", "r" );

        if ( pfp != NULL )
        {
                printf ( "<norge>\n" );
                while ( fscanf ( pfp, "%4s\t%[^\t]\t%4s\t%[^\t]\t%*c\n", pn, pp, fn, fp ) != EOF )
                {
                        if ( strcmp ( cf, fp ) != 0 )
                        {
                                if ( *cf != '\0' ) { printf ( "\t</fylke>\n" ); }
                                printf ( "\t<fylke nummer=\"%s\" navn=\"%s\">\n", fn, fp );
                                strcpy ( cf, fp );
                        }
                        printf ("\t\t<poststed postnummer=\"%s\" poststed=\"%s\" />\n", pn, pp );
                }
                printf ( "\t<fylke>\n" );
        }
        printf ( "</norge>\n" );
        fclose ( pfp );

        return 0;
}

gcc -Wall -g -o [program navn] [kildekode filenavn].c

./[Program navn] > [XML filnnavn].xml