Re: [Qemu-devel] [PATCH 1/8] cutils: unsigned int parsing functions

[Laszlo Ersek <lersek@redhat.com>]

On 01/16/13 19:28, Eduardo Habkost wrote:

> +static void test_parse_uint_negative(void)
> +{
> +    unsigned long long i = 999;
> +    char f = 'X';
> +    char *endptr = &f;
> +    const char *str = " \t -321";
> +    int r;
> +
> +    r = parse_uint(str, &i, &endptr, 0);
> +
> +    g_assert_cmpint(r, ==, -ERANGE);
> +    g_assert_cmpint(i, ==, 0);
> +    g_assert(endptr == str + 3);
> +}

I think it would be more true to the strtol() family if in this case

(a) we reported -EINVAL (invalid subject sequence) -- but I certainly
don't insist on that,

(b) and, independently,

(b1) we either consumed all of the whitespace sequence *and* the subject
sequence (which would be consistent with ERANGE; see
test_parse_uint_overflow()),

(b2) or we didn't consume anything (not even part of the whitespace
sequence). This would be easy to implement and also consistent with the
strtol() family's behavior when it sees an invalid subject sequence:

"If the subject sequence is empty or does not have the expected form, no
conversion is performed; the value of /str/ is stored in the object
pointed to by /endptr/, provided that /endptr/ is not a null pointer."

But I don't insist on (b) either :)

Reviewed-by: Laszlo Ersek <lersek@redhat.com>