From: Christian Couder <christian.couder@gmail.com>
Date: Tue, 16 Sep 2014 08:01:11 GMT
Subject: Re: [PATCH v14 01/11] trailer: add data structures and basic functions
Message-ID: <CAP8UFD3wi2KCZhDAF7vqMpb72DbLMbHNDiDGi0tFLW+vzsQqSA@mail.gmail.com>
In-Reply-To: <xmqqsijs4o02.fsf@gitster.dls.corp.google.com>

On Mon, Sep 15, 2014 at 10:39 PM, Junio C Hamano <gitster@pobox.com> wrote:
> Christian Couder <chriscool@tuxfamily.org> writes:
>
>> +/* Get the length of buf from its beginning until its last alphanumeric character */
>
> That makes it sound as if feeding "abc%de#f@" to the function returns
> 3 for "abc", but

For me the last alphanumeric character in "abc%de#f@" is "f", so it is
the length from the beginning to "f" so it should return 8.

>> +static size_t alnum_len(const char *buf, size_t len)
>> +{
>> +     while (len > 0 && !isalnum(buf[len - 1]))
>> +             len--;
>> +     return len;
>> +}
>
> doesn't it look at '@', be unhappy and decrement, look at 'f' and
> break out to return the length of "abc%de#f"?

Yeah, that's the expected behavior.

> Perhaps that behaviour _is_ what you want, but then the comment is
> lying, no?

I don't think so, but maybe you are parsing the comment in a different
way than I am.
What would you suggest instead?

Thanks,
Christian.