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

const char *str="This is some test data. This is some test data";

static void make_file(void)
{
    FILE *f=fopen("test.file", "w");
    fprintf(f, "%s", str);
    fclose(f);
}

static void test_file(void)
{
    FILE *f=fopen("test.file", "a");
    long int flen=ftell(f);

    if (flen == strlen(str) )
    {
        printf("TEST PASSED: ftell gives: %ld\n", ftell(f));
    }
    else
    {
        printf("TEST FAILED: ftell gives: %ld, strlen=%ld\n", ftell(f),
               strlen(str));
    }
}

int main(void)
{
    make_file();
    test_file();

    return 0;
}