Function default_backend

ds4_bench.c:119–127

    char *end = NULL;
    double v = strtod(s, &end);
    if (s[0] == '\0' || *end != '\0' || !isfinite(v)) {
        fprintf(stderr, "ds4-bench: invalid value for %s: %s\n", opt, s);
        exit(2);
    }
    return v;
}

static const char *need_arg(int *i, int argc, char **argv, const char *opt) {
    if (*i + 1 >= argc) {
        fprintf(stderr, "ds4-bench: %s requires an argument\n", opt);
        exit(2);
    }