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-rw-r--r--src/shared/calendarspec.h44
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diff --git a/src/shared/calendarspec.h b/src/shared/calendarspec.h
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+/* A structure for specifying (possibly repetitive) points in calendar
+ * time, a la cron */
+
+#include <stdbool.h>
+
+#include "time-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:1;
+ bool utc:1;
+ signed int dst:2;
+ char *timezone;
+
+ CalendarComponent *year;
+ CalendarComponent *month;
+ CalendarComponent *day;
+
+ CalendarComponent *hour;
+ CalendarComponent *minute;
+ CalendarComponent *microsecond;
+} CalendarSpec;
+
+CalendarSpec* calendar_spec_free(CalendarSpec *c);
+
+bool calendar_spec_valid(CalendarSpec *spec);
+
+int calendar_spec_to_string(const CalendarSpec *spec, char **ret);
+int calendar_spec_from_string(const char *p, CalendarSpec **ret);
+
+int calendar_spec_next_usec(const CalendarSpec *spec, usec_t usec, usec_t *next);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(CalendarSpec*, calendar_spec_free);