--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/log.c	Tue Feb 04 13:35:52 2020 +0100
@@ -0,0 +1,66 @@
+/*
+ * log.c -- logging routines
+ *
+ * Copyright (c) 2020 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.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <syslog.h>
+
+#include "log.h"
+
+static int syslog_levels[] = {
+	[LOG_LEVEL_DEBUG]       = LOG_DEBUG,
+	[LOG_LEVEL_INFO]        = LOG_INFO,
+	[LOG_LEVEL_WARNING]     = LOG_WARNING
+};
+
+void
+log_open(void)
+{
+	openlog("paster", 0, LOG_USER);
+}
+
+void
+log_write(enum log_level level,const char *fmt, ...)
+{
+	assert(fmt);
+	assert(level >= 0 && level <= LOG_LEVEL_WARNING);
+
+	va_list ap;
+
+	va_start(ap, fmt);
+	log_vwrite(level, fmt, ap);
+	va_end(ap);
+}
+
+void
+log_vwrite(enum log_level level, const char *fmt, va_list ap)
+{
+	assert(fmt);
+	assert(level >= 0 && level <= LOG_LEVEL_WARNING);
+
+	char line[BUFSIZ];
+
+	vsnprintf(line, sizeof (line), fmt, ap);
+	syslog(syslog_levels[level], "%s", line);
+}
+
+void
+log_finish(void)
+{
+	closelog();
+}