Re: [PATCH] show-branch: fix crash with long ref name

[Junio C Hamano <gitster@pobox.com>]

Jeff King <peff@peff.net> writes:

> I see the patches are marked for 'next' in the latest What's Cooking.
> If it is not too late in today's integration cycle, here is a re-roll of
> patch 3 that squashes in Pranit's suggestion (if it is too late, then
> Pranit, you may want to re-send it as a squash on top).

Thanks.  

I think that matches what I queued last night, except for the
Helped-by: line.  Will replace.

> -- >8 --
> Subject: [PATCH] show-branch: use skip_prefix to drop magic numbers
>
> We make several starts_with() calls, only to advance
> pointers. This is exactly what skip_prefix() is for, which
> lets us avoid manually-counted magic numbers.
>
> Helped-by: Pranit Bauva <pranit.bauva@gmail.com>
> Signed-off-by: Jeff King <peff@peff.net>
> ---
>  builtin/show-branch.c | 19 ++++++++-----------
>  1 file changed, 8 insertions(+), 11 deletions(-)
>
> diff --git a/builtin/show-branch.c b/builtin/show-branch.c
> index 404c4d09a..19756595d 100644
> --- a/builtin/show-branch.c
> +++ b/builtin/show-branch.c
> @@ -275,8 +275,7 @@ static void show_one_commit(struct commit *commit, int no_name)
>  		pp_commit_easy(CMIT_FMT_ONELINE, commit, &pretty);
>  		pretty_str = pretty.buf;
>  	}
> -	if (starts_with(pretty_str, "[PATCH] "))
> -		pretty_str += 8;
> +	skip_prefix(pretty_str, "[PATCH] ", &pretty_str);
>  
>  	if (!no_name) {
>  		if (name && name->head_name) {
> @@ -470,17 +469,14 @@ static void snarf_refs(int head, int remotes)
>  	}
>  }
>  
> -static int rev_is_head(char *head, char *name,
> +static int rev_is_head(const char *head, const char *name,
>  		       unsigned char *head_sha1, unsigned char *sha1)
>  {
>  	if (!head || (head_sha1 && sha1 && hashcmp(head_sha1, sha1)))
>  		return 0;
> -	if (starts_with(head, "refs/heads/"))
> -		head += 11;
> -	if (starts_with(name, "refs/heads/"))
> -		name += 11;
> -	else if (starts_with(name, "heads/"))
> -		name += 6;
> +	skip_prefix(head, "refs/heads/", &head);
> +	if (!skip_prefix(name, "refs/heads/", &name))
> +		skip_prefix(name, "heads/", &name);
>  	return !strcmp(head, name);
>  }
>  
> @@ -799,8 +795,9 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
>  				has_head++;
>  		}
>  		if (!has_head) {
> -			int offset = starts_with(head, "refs/heads/") ? 11 : 0;
> -			append_one_rev(head + offset);
> +			const char *name = head;
> +			skip_prefix(name, "refs/heads/", &name);
> +			append_one_rev(name);
>  		}
>  	}