--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/log.h	Tue Jul 12 20:20:51 2022 +0200
@@ -0,0 +1,51 @@
+/*
+ * log.h -- logging routines
+ *
+ * Copyright (c) 2020-2021 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef SCI_LOG_H
+#define SCI_LOG_H
+
+#include <stdarg.h>
+#include <stdlib.h>
+
+enum log_level {
+	LOG_LEVEL_WARNING = 1,
+	LOG_LEVEL_INFO,
+	LOG_LEVEL_DEBUG
+};
+
+#define log_debug(...)  log_write(LOG_LEVEL_DEBUG, __VA_ARGS__)
+#define log_warn(...)   log_write(LOG_LEVEL_WARNING, __VA_ARGS__)
+#define log_info(...)   log_write(LOG_LEVEL_INFO, __VA_ARGS__)
+#define log_die(...) do {                                               \
+        log_write(LOG_LEVEL_WARNING, __VA_ARGS__);                      \
+        exit(1);                                                        \
+} while (0)
+
+void
+log_open(const char *);
+
+void
+log_write(enum log_level, const char *, ...);
+
+void
+log_vwrite(enum log_level, const char *, va_list);
+
+void
+log_finish(void);
+
+#endif /* !SCI_LOG_H */