libmisc: Add error.h

1 files changed, 26 insertions, 0 deletions

diff --git a/libmisc/error.c b/libmisc/error.c
new file mode 100644
index 0000000..dfe4e80
--- /dev/null
+++ b/libmisc/error.c
@@ -0,0 +1,26 @@
+/* libmisc/error.c - Go-esque errors
+ *
+ * Copyright (C) 2025  Luke T. Shumaker <lukeshu@lukeshu.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+#include <libmisc/error.h>
+
+const char *error_msg(error err) {
+	return (err._msg && err._msg[0])
+		? err._msg
+		: _errnum_str_msg(err.num);
+}
+
+void error_cleanup(error *errptr) {
+	if (!errptr)
+		return;
+	if (errptr->_msg)
+		free(errptr->_msg);
+	errptr->num = E_NOERROR;
+	errptr->_msg = NULL;
+}
+
+void fmt_print_error(lo_interface fmt_dest w, error err) {
+	fmt_print(w, (str, error_msg(err)), " (", _errnum_str_sym(err.num), ")");
+}