degesch: parse user@host from RPL_WELCOME

degesch.c

@@ -2256,6 +2256,39 @@ irc_handler_cmp_by_name (const void *a, const void *b)
 	return strcasecmp_ascii (first->name, second->name);
 }
 
+static bool
+irc_try_parse_word_for_userhost (struct app_context *ctx, const char *word)
+{
+	regex_t re;
+	int err = regcomp (&re, "^[^!@]+!([^!@]+@[^!@]+)$", REG_EXTENDED);
+	if (!soft_assert (!err))
+		return false;
+
+	regmatch_t matches[2];
+	bool result = false;
+	if (!regexec (&re, word, 2, matches, 0))
+	{
+		free (ctx->irc_user_host);
+		ctx->irc_user_host = xstrndup (word + matches[1].rm_so,
+			matches[1].rm_eo - matches[1].rm_so);
+		result = true;
+	}
+	regfree (&re);
+	return result;
+}
+
+static void
+irc_try_parse_welcome_for_userhost (struct app_context *ctx, const char *m)
+{
+	struct str_vector v;
+	str_vector_init (&v);
+	split_str_ignore_empty (m, ' ', &v);
+	for (size_t i = 0; i < v.len; i++)
+		if (irc_try_parse_word_for_userhost (ctx, v.vector[i]))
+			break;
+	str_vector_free (&v);
+}
+
 static void
 irc_process_numeric (struct app_context *ctx,
 	const struct irc_message *msg, unsigned long numeric)
@@ -2279,6 +2312,11 @@ irc_process_numeric (struct app_context *ctx,
 
 	switch (numeric)
 	{
+	case IRC_RPL_WELCOME:
+		// We still issue a USERHOST anyway as this is in general unreliable
+		if (msg->params.len == 1)
+			irc_try_parse_welcome_for_userhost (ctx, msg->params.vector[0]);
+		break;
 	case IRC_RPL_ISUPPORT:
 		// TODO: parse this, mainly PREFIX; see
 		//   http://www.irc.org/tech_docs/draft-brocklesby-irc-isupport-03.txt