pointers.c

void f(const char *filename)
{
    // check some conditions
    if (!filename)
        return;

    // ... acquire some resources
    int *array = malloc(sizeof(int) * /* ... */);
    if (!array)
        return;

    FILE *f = fopen(filename);
    if (!f) {
        free(array);
        return;
    }

    // Use resources
    /* ... */

    // Free resources
    fclose(f);
    free(array);
}