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

[Eric Sunshine <sunshine@sunshineco.com>]

On Sun, Apr 14, 2019 at 5:09 PM Thomas Gummerer <t.gummerer@gmail.com> 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@gmail.com>
> ---
> 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(...);

might be appropriate.

> +                       strbuf_addch(&buf, ' ');
> +                       strbuf_addbuf(&buf, &line);