Re: [PATCH v5 3/4] builtin/stash: provide a way to export stashes to a ref

> +static int write_commit_with_parents(struct repository *r,
> +				     struct object_id *out,
> +				     const struct object_id *oid,
> +				     struct commit_list *parents)
> +{
> +	size_t author_len, committer_len;
> +	struct commit *this;
> +	const char *orig_author, *orig_committer;
> +	char *author = NULL, *committer = NULL;
> +	const char *buffer;
> +	unsigned long bufsize;
> +	const char *p;
> +	struct strbuf msg = STRBUF_INIT;
> +	int ret = 0;
> +	struct ident_split id;
> +
> +	this = lookup_commit_reference(r, oid);
> +	buffer = repo_get_commit_buffer(r, this, &bufsize);
> +	orig_author = find_commit_header(buffer, "author", &author_len);
> +	orig_committer = find_commit_header(buffer, "committer", &committer_len);
> +	if (split_ident_line(&id, orig_author, author_len) < 0 ||
> +	    split_ident_line(&id, orig_committer, committer_len) < 0) {
> +		ret = error(_("invalid author or committer for %s"), oid_to_hex(oid));
> +		goto out;
> +	}
> +	p = strstr(buffer, "\n\n");
> +
> +	if (!orig_author || !orig_committer || !p) {
> +		ret = error(_("cannot parse commit %s"), oid_to_hex(oid));
> +		goto out;
> +	}