/*

 * SPDX-License-Identifier: LGPL-2.1-or-later

 *

 * First set of functions in this file are part of systemd, and were

 * copied to util-linux at August 2013.

 *

 * Copyright 2010 Lennart Poettering

 * Copyright (C) 2014 Karel Zak <kzak@redhat.com>

 *

 * This is free software; you can redistribute it and/or modify it under the

 * terms of the GNU Lesser General Public License as published by the Free

 * Software Foundation; either version 2.1 of the License, or (at your option)

 * any later version.

 */

#ifndef UTIL_LINUX_TIME_UTIL_H

#define UTIL_LINUX_TIME_UTIL_H

#include <stdio.h>

#include <inttypes.h>

#include <sys/time.h>

#include <stdbool.h>

typedef uint64_t usec_t;

typedef uint64_t nsec_t;

#define MSEC_PER_SEC  1000ULL

#define USEC_PER_SEC  1000000ULL

#define USEC_PER_MSEC 1000ULL

#define NSEC_PER_SEC  1000000000ULL

#define NSEC_PER_MSEC 1000000ULL

#define NSEC_PER_USEC 1000ULL

#define USEC_PER_MINUTE (60ULL*USEC_PER_SEC)

#define NSEC_PER_MINUTE (60ULL*NSEC_PER_SEC)

#define USEC_PER_HOUR (60ULL*USEC_PER_MINUTE)

#define NSEC_PER_HOUR (60ULL*NSEC_PER_MINUTE)

#define USEC_PER_DAY  (24ULL*USEC_PER_HOUR)

#define NSEC_PER_DAY  (24ULL*NSEC_PER_HOUR)

#define USEC_PER_WEEK (7ULL*USEC_PER_DAY)

#define NSEC_PER_WEEK (7ULL*NSEC_PER_DAY)

#define USEC_PER_MONTH  (2629800ULL*USEC_PER_SEC)

#define NSEC_PER_MONTH  (2629800ULL*NSEC_PER_SEC)

#define USEC_PER_YEAR (31557600ULL*USEC_PER_SEC)

#define NSEC_PER_YEAR (31557600ULL*NSEC_PER_SEC)

#define FORMAT_TIMESTAMP_MAX ((4*4+1)+11+9+4+1) /* weekdays can be unicode */

#define FORMAT_TIMESTAMP_RELATIVE_MAX 256

#define FORMAT_TIMESPAN_MAX 64

int ul_parse_timestamp(const char *t, usec_t *usec);

int get_gmtoff(const struct tm *tp);

/* flags and masks for strxxx_iso() functions */

enum {

  ISO_DATE    = (1 << 0),

  ISO_TIME    = (1 << 1),

  ISO_TIMEZONE    = (1 << 2),

  ISO_DOTUSEC   = (1 << 3),

  ISO_COMMAUSEC   = (1 << 4),

  ISO_DOTNSEC   = (1 << 5),

  ISO_COMMANSEC   = (1 << 6),

  ISO_T     = (1 << 7),

  ISO_GMTIME    = (1 << 8),

  ISO_TIMESTAMP   = ISO_DATE | ISO_TIME | ISO_TIMEZONE,

  ISO_TIMESTAMP_T   = ISO_TIMESTAMP | ISO_T,

  ISO_TIMESTAMP_DOT = ISO_TIMESTAMP | ISO_DOTUSEC,

  ISO_TIMESTAMP_DOT_T = ISO_TIMESTAMP_DOT | ISO_T,

  ISO_TIMESTAMP_COMMA = ISO_TIMESTAMP | ISO_COMMAUSEC,

  ISO_TIMESTAMP_COMMA_T = ISO_TIMESTAMP_COMMA | ISO_T,

  ISO_TIMESTAMP_COMMA_G = ISO_TIMESTAMP_COMMA | ISO_GMTIME,

  ISO_TIMESTAMP_COMMA_GT  = ISO_TIMESTAMP_COMMA_G | ISO_T

};

#define CTIME_BUFSIZ  26

#define ISO_BUFSIZ  42

int strtimeval_iso(const struct timeval *tv, int flags, char *buf, size_t bufsz);

int strtm_iso(const struct tm *tm, int flags, char *buf, size_t bufsz);

int strtime_iso(const time_t *t, int flags, char *buf, size_t bufsz);

int strtimespec_iso(const struct timespec *t, int flags, char *buf, size_t bufsz);

int strtimespec_relative(const struct timespec *ts, char *buf, size_t bufsz);

#define UL_SHORTTIME_THISYEAR_HHMM (1 << 1)

int strtime_short(const time_t *t, struct timeval *now, int flags, char *buf, size_t bufsz);

#ifndef HAVE_TIMEGM

extern time_t timegm(struct tm *tm);

#endif

static inline usec_t timeval_to_usec(const struct timeval *t)

{

  return t->tv_sec * USEC_PER_SEC + t->tv_usec;

}

static inline usec_t timespec_to_usec(const struct timespec *t)

{

  return t->tv_sec * USEC_PER_SEC + t->tv_nsec / NSEC_PER_USEC;

}

static inline struct timeval usec_to_timeval(usec_t t)

{

  struct timeval r = {

    .tv_sec = t / USEC_PER_SEC,

    .tv_usec = t % USEC_PER_SEC,

  };

  return r;

}

static inline bool is_timespecset(const struct timespec *t)

{

  return t->tv_sec || t->tv_nsec;

}

static inline double time_diff(const struct timeval *a, const struct timeval *b)

{

  return (a->tv_sec - b->tv_sec) + (a->tv_usec - b->tv_usec) / (double) USEC_PER_SEC;

}

#endif /* UTIL_LINUX_TIME_UTIL_H */