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Re: [RFC PATCH 2/4] range-diff: don't remove funcname from inner diff




Hi Eric,

On Sun, 14 Apr 2019, Eric Sunshine wrote:

> On Sun, Apr 14, 2019 at 5:09 PM Thomas Gummerer <t.gummerer@xxxxxxxxx> wrote:
> > [...]
> > However it can still be useful to have the function name that 'git
> > diff' extracts as additional context for the change.
> > [...]
> > Signed-off-by: Thomas Gummerer <t.gummerer@xxxxxxxxx>
> > ---
> > diff --git a/range-diff.c b/range-diff.c
> > @@ -102,9 +102,12 @@ static int read_patches(const char *range, struct string_list *list)
> > +               } else if (starts_with(line.buf, "@@ ")) {
> > +                       char *skip_lineno = strstr(line.buf + 3, "@@");
> > +                       strbuf_remove(&line, 0, skip_lineno - line.buf);
>
> It makes me a bit uncomfortable that this is not checking for NULL
> return from strstr() before doing pointer arithmetic (even though the
> input is presumably machine-generated).
>
>     if (!skip_lineno)
>         BUG(...);

Good point, but maybe we should not go so far as to declare this a bug,
and fall back to removing everything bug the initial two `at` characters
instead?

Thanks,
Dscho

>
> might be appropriate.
>
> > +                       strbuf_addch(&buf, ' ');
> > +                       strbuf_addbuf(&buf, &line);
>