1 files changed, 91 insertions, 0 deletions
diff --git a/lib/isc/error.c b/lib/isc/error.c
new file mode 100644
index 0000000..051a6c4
--- /dev/null
+++ b/lib/isc/error.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <isc/error.h>
+#include <isc/print.h>
+
+/*% Default unexpected callback. */
+static void
+default_unexpected_callback(const char *, int, const char *, const char *,
+			    va_list) ISC_FORMAT_PRINTF(4, 0);
+
+/*% Default fatal callback. */
+static void
+default_fatal_callback(const char *, int, const char *, const char *, va_list)
+	ISC_FORMAT_PRINTF(3, 0);
+
+/*% unexpected_callback */
+static isc_errorcallback_t unexpected_callback = default_unexpected_callback;
+static isc_errorcallback_t fatal_callback = default_fatal_callback;
+
+void
+isc_error_setunexpected(isc_errorcallback_t cb) {
+	if (cb == NULL) {
+		unexpected_callback = default_unexpected_callback;
+	} else {
+		unexpected_callback = cb;
+	}
+}
+
+void
+isc_error_setfatal(isc_errorcallback_t cb) {
+	if (cb == NULL) {
+		fatal_callback = default_fatal_callback;
+	} else {
+		fatal_callback = cb;
+	}
+}
+
+void
+isc_error_unexpected(const char *file, int line, const char *func,
+		     const char *format, ...) {
+	va_list args;
+
+	va_start(args, format);
+	(unexpected_callback)(file, line, func, format, args);
+	va_end(args);
+}
+
+void
+isc_error_fatal(const char *file, int line, const char *func,
+		const char *format, ...) {
+	va_list args;
+
+	va_start(args, format);
+	(fatal_callback)(file, line, func, format, args);
+	va_end(args);
+	abort();
+}
+
+static void
+default_unexpected_callback(const char *file, int line, const char *func,
+			    const char *format, va_list args) {
+	fprintf(stderr, "%s:%d:%s(): ", file, line, func);
+	vfprintf(stderr, format, args);
+	fprintf(stderr, "\n");
+	fflush(stderr);
+}
+
+static void
+default_fatal_callback(const char *file, int line, const char *func,
+		       const char *format, va_list args) {
+	fprintf(stderr, "%s:%d:%s(): fatal error: ", file, line, func);
+	vfprintf(stderr, format, args);
+	fprintf(stderr, "\n");
+	fflush(stderr);
+}