Re: [Patch v5 5/8] lib: add a log function with output to a string in notmuch_database_t

[Tomi Ollila <tomi.ollila@iki.fi>]

On Tue, Mar 24 2015, David Bremner <david@tethera.net> wrote:

> In principle in the future this could do something fancier than sprintf.

It would be better talking of sNprintf -- it is more accurate and
potentially more educational.

Rest of the patches in this series OK

> ---
>  lib/database-private.h |  4 ++++
>  lib/database.cc        | 24 ++++++++++++++++++++++++
>  lib/notmuch-private.h  |  4 ++++
>  lib/notmuch.h          |  7 +++++++
>  4 files changed, 39 insertions(+)
>
> diff --git a/lib/database-private.h b/lib/database-private.h
> index 6d6fa2c..24243db 100644
> --- a/lib/database-private.h
> +++ b/lib/database-private.h
> @@ -154,6 +154,10 @@ struct _notmuch_database {
>      unsigned int last_doc_id;
>      uint64_t last_thread_id;
>  
> +    /* error reporting; this value persists only until the
> +     * next library call. May be NULL */
> +    char *status_string;
> +
>      Xapian::QueryParser *query_parser;
>      Xapian::TermGenerator *term_gen;
>      Xapian::ValueRangeProcessor *value_range_processor;
> diff --git a/lib/database.cc b/lib/database.cc
> index 36849d7..673561b 100644
> --- a/lib/database.cc
> +++ b/lib/database.cc
> @@ -348,6 +348,23 @@ notmuch_status_to_string (notmuch_status_t status)
>      }
>  }
>  
> +void
> +_notmuch_database_log (notmuch_database_t *notmuch,
> +		      const char *format,
> +		      ...)
> +{
> +    va_list va_args;
> +
> +    va_start (va_args, format);
> +
> +    if (notmuch->status_string)
> +	talloc_free (notmuch->status_string);
> +
> +    notmuch->status_string = talloc_vasprintf (notmuch, format, va_args);
> +
> +    va_end (va_args);
> +}
> +
>  static void
>  find_doc_ids_for_term (notmuch_database_t *notmuch,
>  		       const char *term,
> @@ -845,6 +862,7 @@ notmuch_database_open_verbose (const char *path,
>  
>      notmuch = talloc_zero (NULL, notmuch_database_t);
>      notmuch->exception_reported = FALSE;
> +    notmuch->status_string = NULL;
>      notmuch->path = talloc_strdup (notmuch, path);
>  
>      if (notmuch->path[strlen (notmuch->path) - 1] == '/')
> @@ -2530,3 +2548,9 @@ notmuch_database_get_all_tags (notmuch_database_t *db)
>  	return NULL;
>      }
>  }
> +
> +const char *
> +notmuch_database_status_string (notmuch_database_t *notmuch)
> +{
> +    return notmuch->status_string;
> +}
> diff --git a/lib/notmuch-private.h b/lib/notmuch-private.h
> index 8a1f2fa..7cb6fd4 100644
> --- a/lib/notmuch-private.h
> +++ b/lib/notmuch-private.h
> @@ -190,6 +190,10 @@ _notmuch_message_id_compressed (void *ctx, const char *message_id);
>  notmuch_status_t
>  _notmuch_database_ensure_writable (notmuch_database_t *notmuch);
>  
> +void
> +_notmuch_database_log (notmuch_database_t *notmuch,
> +		       const char *format, ...);
> +
>  const char *
>  _notmuch_database_relative_path (notmuch_database_t *notmuch,
>  				 const char *path);
> diff --git a/lib/notmuch.h b/lib/notmuch.h
> index c671d82..20c4e01 100644
> --- a/lib/notmuch.h
> +++ b/lib/notmuch.h
> @@ -302,6 +302,13 @@ notmuch_database_open_verbose (const char *path,
>  			       char **error_message);
>  
>  /**
> + * Retrieve last status string for given database.
> + *
> + */
> +const char *
> +notmuch_database_status_string (notmuch_database_t *notmuch);
> +
> +/**
>   * Commit changes and close the given notmuch database.
>   *
>   * After notmuch_database_close has been called, calls to other
> -- 
> 2.1.4
>
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> notmuch@notmuchmail.org
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