1 files changed, 46 insertions, 0 deletions
diff --git a/src/shared/calendarspec.h b/src/shared/calendarspec.h
new file mode 100644
index 0000000..3bf8a39
--- /dev/null
+++ b/src/shared/calendarspec.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#pragma once
+
+/* A structure for specifying (possibly repetitive) points in calendar
+ * time, a la cron */
+
+#include <stdbool.h>
+
+#include "time-util.h"
+#include "util.h"
+
+typedef struct CalendarComponent {
+        int start;
+        int stop;
+        int repeat;
+
+        struct CalendarComponent *next;
+} CalendarComponent;
+
+typedef struct CalendarSpec {
+        int weekdays_bits;
+        bool end_of_month;
+        bool utc;
+        int dst;
+        char *timezone;
+
+        CalendarComponent *year;
+        CalendarComponent *month;
+        CalendarComponent *day;
+
+        CalendarComponent *hour;
+        CalendarComponent *minute;
+        CalendarComponent *microsecond;
+} CalendarSpec;
+
+CalendarSpec* calendar_spec_free(CalendarSpec *c);
+
+int calendar_spec_normalize(CalendarSpec *spec);
+bool calendar_spec_valid(CalendarSpec *spec);
+
+int calendar_spec_to_string(const CalendarSpec *spec, char **p);
+int calendar_spec_from_string(const char *p, CalendarSpec **spec);
+
+int calendar_spec_next_usec(const CalendarSpec *spec, usec_t usec, usec_t *next);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(CalendarSpec*, calendar_spec_free);