degesch: refactor /help, fix segfault

Forgot to check if the item has a schema.

1 files changed, 44 insertions, 32 deletions

diff --git a/degesch.c b/degesch.c
index b0a3e04..1d66a9d 100644
--- a/degesch.c
+++ b/degesch.c
@@ -4121,6 +4121,41 @@ g_command_handlers[] =
 };
 
 static bool
+try_handle_command_help_option (struct app_context *ctx, const char *name)
+{
+	struct config_item_ *item =
+		config_item_get (ctx->config.root, name, NULL);
+	if (!item)
+		return false;
+
+	struct config_schema *schema = item->schema;
+	if (!schema)
+	{
+		buffer_send_error (ctx, ctx->global_buffer,
+			"%s: %s", "This option has no schema", name);
+		return true;
+	}
+
+	buffer_send_status (ctx, ctx->global_buffer, "%s", "");
+	buffer_send_status (ctx, ctx->global_buffer,
+		"Option \"%s\":", name);
+	buffer_send_status (ctx, ctx->global_buffer,
+		"  Description: %s", schema->comment);
+	buffer_send_status (ctx, ctx->global_buffer,
+		"  Type: %s", config_item_type_name (schema->type));
+	buffer_send_status (ctx, ctx->global_buffer,
+		"  Default: %s", schema->default_ ? schema->default_ : "null");
+
+	struct str tmp;
+	str_init (&tmp);
+	config_item_write (item, false, &tmp);
+	buffer_send_status (ctx, ctx->global_buffer,
+		"  Current value: %s", tmp.str);
+	str_free (&tmp);
+	return true;
+}
+
+static bool
 handle_command_help (struct app_context *ctx, char *arguments)
 {
 	if (!*arguments)
@@ -4140,43 +4175,20 @@ handle_command_help (struct app_context *ctx, char *arguments)
 	for (size_t i = 0; i < N_ELEMENTS (g_command_handlers); i++)
 	{
 		struct command_handler *handler = &g_command_handlers[i];
-		if (!strcasecmp_ascii (command, handler->name))
-		{
-			buffer_send_status (ctx, ctx->global_buffer, "%s", "");
-			buffer_send_status (ctx, ctx->global_buffer, "%s: %s",
-				handler->name, handler->description);
-			buffer_send_status (ctx, ctx->global_buffer, "  Arguments: %s",
-				handler->usage);
-			return true;
-		}
-	}
+		if (strcasecmp_ascii (command, handler->name))
+			continue;
 
-	struct config_item_ *item =
-		config_item_get (ctx->config.root, command, NULL);
-	if (item)
-	{
-		struct config_schema *schema = item->schema;
 		buffer_send_status (ctx, ctx->global_buffer, "%s", "");
-		buffer_send_status (ctx, ctx->global_buffer,
-			"Option \"%s\":", command);
-		buffer_send_status (ctx, ctx->global_buffer,
-			"  Description: %s", schema->comment);
-		buffer_send_status (ctx, ctx->global_buffer,
-			"  Type: %s", config_item_type_name (schema->type));
-		buffer_send_status (ctx, ctx->global_buffer,
-			"  Default: %s", schema->default_ ? schema->default_ : "null");
-
-		struct str tmp;
-		str_init (&tmp);
-		config_item_write (item, false, &tmp);
-		buffer_send_status (ctx, ctx->global_buffer,
-			"  Current value: %s", tmp.str);
-		str_free (&tmp);
+		buffer_send_status (ctx, ctx->global_buffer, "%s: %s",
+			handler->name, handler->description);
+		buffer_send_status (ctx, ctx->global_buffer, "  Arguments: %s",
+			handler->usage);
 		return true;
 	}
 
-	buffer_send_error (ctx, ctx->global_buffer,
-		"%s: %s", "No such command or option", command);
+	if (!try_handle_command_help_option (ctx, command))
+		buffer_send_error (ctx, ctx->global_buffer,
+			"%s: %s", "No such command or option", command);
 	return true;
 }