int ch;
    char *tmp = malloc(512);
    size_t s = 512;
    size_t r = 0;
    while ((ch = fgetc(h)) != EOF) {
        if (r == s) {
            //grow tmp
            char *ttmp = realloc(tmp, (13*s)/8); // 13/8 is within 0.5% of the golden ratio
            if (ttmp) {
                tmp = ttmp;
                s = (13*s)/8;
            } else {
                free(tmp);
                return 0;
            }