On 07/12/2013 10:28 PM, Junio C Hamano wrote:
> Stefan Beller <stefanbel...@googlemail.com> writes:
>>      # Adding the line to the mailmap should make life easy, so we know
>>      # it's the same person
>>      echo "A <a...@example.org> <changed_em...@example.org>" > .mailmap
> While I was looking at this, I noticed this piece of code:
> diff --git a/mailmap.c b/mailmap.c
> index 2a7b366..418081e 100644
> --- a/mailmap.c
> +++ b/mailmap.c
> @@ -122,7 +122,7 @@ static char *parse_name_and_email(char *buffer, char 
> **name,
>       while (nend > nstart && isspace(*nend))
>               --nend;
> -     *name = (nstart < nend ? nstart : NULL);
> +     *name = (nstart <= nend ? nstart : NULL);
>       *email = left+1;
>       *(nend+1) = '\0';
>       *right++ = '\0';
> The function is given a buffer "A <a...@example.org>...", nstart scans
> from the beginning of the buffer, skipping whitespaces (there isn't
> any, so nstart points at the buffer), while nend starts from one
> byte before the first '<' and skips whitespaces backwards and ends
> at the first non-whitespace (i.e. it hits "A" at the beginning of
> the buffer).  nstart == nend in this case for a single-letter name,
> and an off-by-one error makes it fail to pick up the name, which
> makes the entry equivalent to
>       <a...@example.org> <changed_em...@example.org>
> without the name.  I do not think this bug affected anything you
> observed, though.
>>      git shortlog -sne
>>               1  A <a...@example.org>
>>               1  A <a...@example.org>
> This is coming from mailmap.c::add_mapping() that downcases the
> e-mail address.
> changed_em...@example.org is mapped to a...@example.org because of this
> downcasing, while "A <a...@example.org>" does not have any entry for it
> in the .mailmap file, so it is given back as-is.  Hence we see two
> distinct entries.

So do I understand it right, we're having 2 bugs in here?

One being triggered by the short name, only one character.
So if you want to debug the other bug with a longer name,
you can either use a made up name, or run
    git shortlog -sne |grep Knut
in the git repository having the mailmap file already updated.
The way the mailmap file is written, I'd assume only one line
to be found, as of now 2 lines come up
     2  Knut Franke <knut.fra...@gmx.de>
     1  Knut Franke <knut.fra...@gmx.de>

which seems to downcase the whole first email.

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