move utilities to liblfjail

1 files changed, 34 insertions, 0 deletions

diff --git a/liblfjail/config_error.hh b/liblfjail/config_error.hh
new file mode 100644
index 0000000..c515b54
--- /dev/null
+++ b/liblfjail/config_error.hh
@@ -0,0 +1,34 @@
+/*
+ * This source code is released into the public domain.
+ */
+
+#ifndef	LFJAIL_CONFIG_ERROR_HH
+#define	LFJAIL_CONFIG_ERROR_HH
+
+#include <format>
+#include <stdexcept>
+
+namespace lfjail::config {
+
+/*
+ * Exception thrown when an issue occurs with the configuration.
+ */
+struct error : std::runtime_error {
+	template<typename... Args>
+	error(std::format_string<Args...> fmt, Args &&...args)
+		: std::runtime_error(std::format(fmt, std::forward<Args>(args)...))
+	{}
+};
+
+struct unknown_setting final : error {
+	std::string varname;
+
+	unknown_setting(std::string_view varname_)
+		: error("unknown configuration variable '{0}'", varname_)
+		, varname(varname_)
+	{}
+};
+
+} // namespace lfjail::config
+
+#endif	// !LFJAIL_CONFIG_ERROR_HH