degesch: correctly update user prefixes

degesch.c

@@ -820,13 +820,14 @@ struct channel_user
 	LIST_HEADER (struct channel_user)
 
 	struct user *user;                  ///< Reference to user
-	char *modes;                        ///< Ordered @+... characters
+	struct str prefixes;                ///< Ordered @+... characters
 };
 
 static struct channel_user *
 channel_user_new (void)
 {
 	struct channel_user *self = xcalloc (1, sizeof *self);
+	str_init (&self->prefixes);
 	return self;
 }
 
@@ -834,7 +835,7 @@ static void
 channel_user_destroy (struct channel_user *self)
 {
 	user_unref (self->user);
-	free (self->modes);
+	str_free (&self->prefixes);
 	free (self);
 }
 
@@ -3878,7 +3879,6 @@ irc_handle_join (struct server *s, const struct irc_message *msg)
 
 	struct channel_user *channel_user = channel_user_new ();
 	channel_user->user = user;
-	channel_user->modes = xstrdup ("");
 	LIST_PREPEND (channel->users, channel_user);
 
 	// Finally log the message
@@ -3938,8 +3938,8 @@ struct mode_processor
 
 	char **params;                      ///< Mode string parameters
 
-	struct server *s;                   ///< Who does the changes
-	struct channel *channel;            ///< The channel we're modifying
+	struct server *s;                   ///< Server
+	struct channel *channel;            ///< The channel being modified
 
 	// Internals:
 
@@ -3978,24 +3978,27 @@ mode_processor_do_user (struct mode_processor *self)
 	if (!channel_user)
 		return;
 
-	char prefix = self->s->irc_chanuser_prefixes
-		[strchr (self->s->irc_chanuser_modes, self->mode_char)
-			- self->s->irc_chanuser_modes];
+	const char *all_prefixes = self->s->irc_chanuser_prefixes;
+	const char *all_modes    = self->s->irc_chanuser_modes;
+	char prefix = all_prefixes[strchr (all_modes, self->mode_char) - all_modes];
 
-	// XXX: shouldn't this rather be a "struct str"?
-	char *modes = channel_user->modes;
-	char *pos = strchr (modes, self->mode_char);
+	struct str *prefixes = &channel_user->prefixes;
+	const char *pos = strchr (prefixes->str, prefix);
 	if (self->adding == !!pos)
 		return;
 
 	if (self->adding)
 	{
-		// FIXME: this doesn't give two fucks about the correct order
-		channel_user->modes = xstrdup_printf ("%s%c", modes, prefix);
-		free (modes);
+		// Add the new mode prefix while retaining the right order
+		char *old_prefixes = str_steal (prefixes);
+		str_init (prefixes);
+		for (const char *p = all_prefixes; *p; p++)
+			if (*p == prefix || strchr (old_prefixes, *p))
+				str_append_c (prefixes, *p);
+		free (old_prefixes);
 	}
 	else
-		memmove (pos, pos + 1, strlen (pos + 1));
+		str_remove_slice (prefixes, pos - prefixes->str, 1);
 }
 
 static void
@@ -4689,26 +4692,27 @@ irc_process_names (struct server *s, struct channel *channel)
 	for (size_t i = 0; i < updates->len; i++)
 	{
 		const char *item = updates->vector[i];
-		const char *nick = item + strspn (item, s->irc_chanuser_prefixes);
-		char *modes = xstrndup (item, nick - item);
+		size_t n_prefixes = strspn (item, s->irc_chanuser_prefixes);
+		const char *nick = item + n_prefixes;
+
+		char prefixes[n_prefixes + 1];
+		memcpy (prefixes, item, n_prefixes);
+		prefixes[n_prefixes] = '\0';
 
 		struct channel_user *channel_user = str_map_find (&map, nick);
 		if (!channel_user)
 		{
 			channel_user = channel_user_new ();
 			channel_user->user = irc_get_or_make_user (s, nick);
-			channel_user->modes = modes;
 			LIST_PREPEND (channel->users, channel_user);
 		}
 		// If our idea of the user's modes disagrees with what the server's
 		// sent us (the most powerful modes differ), use the latter one
-		else if (channel_user->modes[0] != modes[0])
-		{
-			free (channel_user->modes);
-			channel_user->modes = modes;
-		}
-		else
-			free (modes);
+		else if (channel_user->prefixes.str[0] == prefixes[0])
+			continue;
+
+		str_reset (&channel_user->prefixes);
+		str_append (&channel_user->prefixes, prefixes);
 	}
 
 	// TODO: get rid of channel users missing from "updates":
@@ -4721,7 +4725,7 @@ irc_process_names (struct server *s, struct channel *channel)
 	str_vector_init (&v);
 	LIST_FOR_EACH (struct channel_user, iter, channel->users)
 		str_vector_add_owned (&v,
-			xstrdup_printf ("%s%s", iter->modes, iter->user->nickname));
+			xstrdup_printf ("%s%s", iter->prefixes.str, iter->user->nickname));
 	char *all_users = join_str_vector (&v, ' ');
 	str_vector_free (&v);