[PATCH] lib: another iterator-temporary/stale-pointer bug
Jani Nikula
jani at nikula.org
Thu Jan 1 06:49:31 PST 2015
On Sun, 28 Dec 2014, David Bremner <david at tethera.net> wrote:
> Tamas Szakaly points out [1] that the bug fixed in 51b073c still
> exists in at least one place. This change follows the suggestion of
> [2] and creates a block scope temporary std::string to avoid the rules
> of iterators temporaries.
>
> [1]: id:20141226113755.GA64154 at pamparam
> [2]: id:20141226230655.GA41992 at pamparam
> ---
>
> I decided to take a more minimalist approach than [2]. In particular
> using "direntry" for two different things seemed slightly trickier
> than necessary, for no obvious performance gain (calling .c_str()
> should be cheap).
>
> lib/message.cc | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/lib/message.cc b/lib/message.cc
> index a7a13cc..bacb4d4 100644
> --- a/lib/message.cc
> +++ b/lib/message.cc
> @@ -641,15 +641,16 @@ _notmuch_message_add_directory_terms (void *ctx, notmuch_message_t *message)
> unsigned int directory_id;
> const char *direntry, *directory;
> char *colon;
> + const std::string term = *i;
You could use a reference here like in [2]. Either way, LGTM.
Jani.
>
> /* Terminate loop at first term without desired prefix. */
> - if (strncmp ((*i).c_str (), direntry_prefix, direntry_prefix_len))
> + if (strncmp (term.c_str (), direntry_prefix, direntry_prefix_len))
> break;
>
> /* Indicate that there are filenames remaining. */
> status = NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID;
>
> - direntry = (*i).c_str ();
> + direntry = term.c_str ();
> direntry += direntry_prefix_len;
>
> directory_id = strtol (direntry, &colon, 10);
> --
> 2.1.3
>
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