/*      $OpenBSD: timetest.c,v 1.5 2025/08/17 08:43:03 phessler Exp $ */

/*
 * Copyright (c) 2022 Bob Beck <beck@openbsd.org>
 *
 * Permission to use, copy, modify, and 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 <sys/stat.h>
#include <sys/stdint.h>
#include <sys/types.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

struct timetest {
        char *descr;
        char *timezone;
        time_t time;
        struct tm local_tm;
        struct tm gmt_tm;
};

static int tm_match(struct tm * tm1, struct tm *tm2) {
        if (tm2->tm_year != tm1->tm_year ||
            tm2->tm_mon != tm1->tm_mon ||
            tm2->tm_mday != tm1->tm_mday ||
            tm2->tm_hour != tm1->tm_hour ||
            tm2->tm_min != tm1->tm_min ||
            tm2->tm_sec != tm1->tm_sec ||
            tm2->tm_wday != tm1->tm_wday ||
            tm2->tm_yday != tm1->tm_yday ||
            tm2->tm_yday != tm1->tm_yday ||
            tm2->tm_isdst != tm1->tm_isdst ||
            tm2->tm_gmtoff != tm1->tm_gmtoff ||
            strcmp(tm2->tm_zone, tm1->tm_zone) != 0)
                return 0;
        return 1;
}

struct timetest timetests[] = {
        {
                .descr="moon",
                .timezone="posix/America/Edmonton",
                .time=-16751025,
                .local_tm=              {
                        .tm_year=69,
                        .tm_mon=5,
                        .tm_mday=20,
                        .tm_hour=19,
                        .tm_min=56,
                        .tm_sec=15,
                        .tm_wday=5,
                        .tm_yday=170,
                        .tm_isdst=0,
                        .tm_gmtoff=-25200,
                        .tm_zone="MST"
                },
                .gmt_tm=                {
                        .tm_year=69,
                        .tm_mon=5,
                        .tm_mday=21,
                        .tm_hour=2,
                        .tm_min=56,
                        .tm_sec=15,
                        .tm_wday=6,
                        .tm_yday=171,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="moon",
                .timezone="right/GMT",
                .time=-16751025,
                .local_tm=              {
                        .tm_year=69,
                        .tm_mon=5,
                        .tm_mday=21,
                        .tm_hour=2,
                        .tm_min=56,
                        .tm_sec=15,
                        .tm_wday=6,
                        .tm_yday=171,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="GMT"
                },
                .gmt_tm=                {
                        .tm_year=69,
                        .tm_mon=5,
                        .tm_mday=21,
                        .tm_hour=2,
                        .tm_min=56,
                        .tm_sec=15,
                        .tm_wday=6,
                        .tm_yday=171,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="moon",
                .timezone="right/America/Edmonton",
                .time=-16751025,
                .local_tm=              {
                        .tm_year=69,
                        .tm_mon=5,
                        .tm_mday=20,
                        .tm_hour=19,
                        .tm_min=56,
                        .tm_sec=15,
                        .tm_wday=5,
                        .tm_yday=170,
                        .tm_isdst=0,
                        .tm_gmtoff=-25200,
                        .tm_zone="MST"
                },
                .gmt_tm=                {
                        .tm_year=69,
                        .tm_mon=5,
                        .tm_mday=21,
                        .tm_hour=2,
                        .tm_min=56,
                        .tm_sec=15,
                        .tm_wday=6,
                        .tm_yday=171,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="epoch",
                .timezone="posix/America/Edmonton",
                .time=0,
                .local_tm=              {
                        .tm_year=69,
                        .tm_mon=11,
                        .tm_mday=31,
                        .tm_hour=17,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=3,
                        .tm_yday=364,
                        .tm_isdst=0,
                        .tm_gmtoff=-25200,
                        .tm_zone="MST"
                },
                .gmt_tm=                {
                        .tm_year=70,
                        .tm_mon=0,
                        .tm_mday=1,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=4,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="epoch",
                .timezone="right/GMT",
                .time=0,
                .local_tm=              {
                        .tm_year=70,
                        .tm_mon=0,
                        .tm_mday=1,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=4,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="GMT"
                },
                .gmt_tm=                {
                        .tm_year=70,
                        .tm_mon=0,
                        .tm_mday=1,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=4,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="epoch",
                .timezone="right/America/Edmonton",
                .time=0,
                .local_tm=              {
                        .tm_year=69,
                        .tm_mon=11,
                        .tm_mday=31,
                        .tm_hour=17,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=3,
                        .tm_yday=364,
                        .tm_isdst=0,
                        .tm_gmtoff=-25200,
                        .tm_zone="MST"
                },
                .gmt_tm=                {
                        .tm_year=70,
                        .tm_mon=0,
                        .tm_mday=1,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=4,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="epoch - 1",
                .timezone="posix/America/Edmonton",
                .time=-1,
                .local_tm=              {
                        .tm_year=69,
                        .tm_mon=11,
                        .tm_mday=31,
                        .tm_hour=16,
                        .tm_min=59,
                        .tm_sec=59,
                        .tm_wday=3,
                        .tm_yday=364,
                        .tm_isdst=0,
                        .tm_gmtoff=-25200,
                        .tm_zone="MST"
                },
                .gmt_tm=                {
                        .tm_year=69,
                        .tm_mon=11,
                        .tm_mday=31,
                        .tm_hour=23,
                        .tm_min=59,
                        .tm_sec=59,
                        .tm_wday=3,
                        .tm_yday=364,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="epoch - 1",
                .timezone="right/GMT",
                .time=-1,
                .local_tm=              {
                        .tm_year=69,
                        .tm_mon=11,
                        .tm_mday=31,
                        .tm_hour=23,
                        .tm_min=59,
                        .tm_sec=59,
                        .tm_wday=3,
                        .tm_yday=364,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="GMT"
                },
                .gmt_tm=                {
                        .tm_year=69,
                        .tm_mon=11,
                        .tm_mday=31,
                        .tm_hour=23,
                        .tm_min=59,
                        .tm_sec=59,
                        .tm_wday=3,
                        .tm_yday=364,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="epoch - 1",
                .timezone="right/America/Edmonton",
                .time=-1,
                .local_tm=              {
                        .tm_year=69,
                        .tm_mon=11,
                        .tm_mday=31,
                        .tm_hour=16,
                        .tm_min=59,
                        .tm_sec=59,
                        .tm_wday=3,
                        .tm_yday=364,
                        .tm_isdst=0,
                        .tm_gmtoff=-25200,
                        .tm_zone="MST"
                },
                .gmt_tm=                {
                        .tm_year=69,
                        .tm_mon=11,
                        .tm_mday=31,
                        .tm_hour=23,
                        .tm_min=59,
                        .tm_sec=59,
                        .tm_wday=3,
                        .tm_yday=364,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="legacy min",
                .timezone="posix/America/Edmonton",
                .time=-2147483648,
                .local_tm=              {
                        .tm_year=1,
                        .tm_mon=11,
                        .tm_mday=13,
                        .tm_hour=13,
                        .tm_min=12,
                        .tm_sec=0,
                        .tm_wday=5,
                        .tm_yday=346,
                        .tm_isdst=0,
                        .tm_gmtoff=-27232,
                        .tm_zone="LMT"
                },
                .gmt_tm=                {
                        .tm_year=1,
                        .tm_mon=11,
                        .tm_mday=13,
                        .tm_hour=20,
                        .tm_min=45,
                        .tm_sec=52,
                        .tm_wday=5,
                        .tm_yday=346,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="legacy min",
                .timezone="right/GMT",
                .time=-2147483648,
                .local_tm=              {
                        .tm_year=1,
                        .tm_mon=11,
                        .tm_mday=13,
                        .tm_hour=20,
                        .tm_min=45,
                        .tm_sec=52,
                        .tm_wday=5,
                        .tm_yday=346,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="GMT"
                },
                .gmt_tm=                {
                        .tm_year=1,
                        .tm_mon=11,
                        .tm_mday=13,
                        .tm_hour=20,
                        .tm_min=45,
                        .tm_sec=52,
                        .tm_wday=5,
                        .tm_yday=346,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="legacy min - 1",
                .timezone="posix/America/Edmonton",
                .time=-2147483649,
                .local_tm=              {
                        .tm_year=1,
                        .tm_mon=11,
                        .tm_mday=13,
                        .tm_hour=13,
                        .tm_min=11,
                        .tm_sec=59,
                        .tm_wday=5,
                        .tm_yday=346,
                        .tm_isdst=0,
                        .tm_gmtoff=-27232,
                        .tm_zone="LMT"
                },
                .gmt_tm=                {
                        .tm_year=1,
                        .tm_mon=11,
                        .tm_mday=13,
                        .tm_hour=20,
                        .tm_min=45,
                        .tm_sec=51,
                        .tm_wday=5,
                        .tm_yday=346,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="legacy min - 1",
                .timezone="right/GMT",
                .time=-2147483649,
                .local_tm=              {
                        .tm_year=1,
                        .tm_mon=11,
                        .tm_mday=13,
                        .tm_hour=20,
                        .tm_min=45,
                        .tm_sec=51,
                        .tm_wday=5,
                        .tm_yday=346,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="GMT"
                },
                .gmt_tm=                {
                        .tm_year=1,
                        .tm_mon=11,
                        .tm_mday=13,
                        .tm_hour=20,
                        .tm_min=45,
                        .tm_sec=51,
                        .tm_wday=5,
                        .tm_yday=346,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="legacy max",
                .timezone="posix/America/Edmonton",
                .time=2147483647,
                .local_tm=              {
                        .tm_year=138,
                        .tm_mon=0,
                        .tm_mday=18,
                        .tm_hour=20,
                        .tm_min=14,
                        .tm_sec=7,
                        .tm_wday=1,
                        .tm_yday=17,
                        .tm_isdst=0,
                        .tm_gmtoff=-25200,
                        .tm_zone="MST"
                },
                .gmt_tm=                {
                        .tm_year=138,
                        .tm_mon=0,
                        .tm_mday=19,
                        .tm_hour=3,
                        .tm_min=14,
                        .tm_sec=7,
                        .tm_wday=2,
                        .tm_yday=18,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="legacy max",
                .timezone="right/GMT",
                .time=2147483647,
                .local_tm=              {
                        .tm_year=138,
                        .tm_mon=0,
                        .tm_mday=19,
                        .tm_hour=3,
                        .tm_min=13,
                        .tm_sec=40,
                        .tm_wday=2,
                        .tm_yday=18,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="GMT"
                },
                .gmt_tm=                {
                        .tm_year=138,
                        .tm_mon=0,
                        .tm_mday=19,
                        .tm_hour=3,
                        .tm_min=14,
                        .tm_sec=7,
                        .tm_wday=2,
                        .tm_yday=18,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="legacy max + 1",
                .timezone="posix/America/Edmonton",
                .time=2147483648,
                .local_tm=              {
                        .tm_year=138,
                        .tm_mon=0,
                        .tm_mday=18,
                        .tm_hour=20,
                        .tm_min=14,
                        .tm_sec=8,
                        .tm_wday=1,
                        .tm_yday=17,
                        .tm_isdst=0,
                        .tm_gmtoff=-25200,
                        .tm_zone="MST"
                },
                .gmt_tm=                {
                        .tm_year=138,
                        .tm_mon=0,
                        .tm_mday=19,
                        .tm_hour=3,
                        .tm_min=14,
                        .tm_sec=8,
                        .tm_wday=2,
                        .tm_yday=18,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="legacy max + 1",
                .timezone="right/GMT",
                .time=2147483648,
                .local_tm=              {
                        .tm_year=138,
                        .tm_mon=0,
                        .tm_mday=19,
                        .tm_hour=3,
                        .tm_min=13,
                        .tm_sec=41,
                        .tm_wday=2,
                        .tm_yday=18,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="GMT"
                },
                .gmt_tm=                {
                        .tm_year=138,
                        .tm_mon=0,
                        .tm_mday=19,
                        .tm_hour=3,
                        .tm_min=14,
                        .tm_sec=8,
                        .tm_wday=2,
                        .tm_yday=18,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="min",
                .timezone="posix/America/Edmonton",
                .time=INT64_MIN,
                .local_tm=              {
                        .tm_year=0,
                        .tm_mon=0,
                        .tm_mday=0,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=0,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="FAILURE"
                },
                .gmt_tm=                {
                        .tm_year=0,
                        .tm_mon=0,
                        .tm_mday=0,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=0,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="FAILURE"
                },
        },
        {
                .descr="min",
                .timezone="right/GMT",
                .time=INT64_MIN,
                .local_tm=              {
                        .tm_year=0,
                        .tm_mon=0,
                        .tm_mday=0,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=0,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="FAILURE"
                },
                .gmt_tm=                {
                        .tm_year=0,
                        .tm_mon=0,
                        .tm_mday=0,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=0,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="FAILURE"
                },
        },
        {
                .descr="max",
                .timezone="right/America/Edmonton",
                .time=9223372036854775807,
                .local_tm=              {
                        .tm_year=0,
                        .tm_mon=0,
                        .tm_mday=0,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=0,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="FAILURE"
                },
                .gmt_tm=                {
                        .tm_year=0,
                        .tm_mon=0,
                        .tm_mday=0,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=0,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="FAILURE"
                },
        },
        {
                .descr="max",
                .timezone="posix/America/Edmonton",
                .time=9223372036854775807,
                .local_tm=              {
                        .tm_year=0,
                        .tm_mon=0,
                        .tm_mday=0,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=0,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="FAILURE"
                },
                .gmt_tm=                {
                        .tm_year=0,
                        .tm_mon=0,
                        .tm_mday=0,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=0,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="FAILURE"
                },
        },
        {
                .descr="max",
                .timezone="right/GMT",
                .time=9223372036854775807,
                .local_tm=              {
                        .tm_year=0,
                        .tm_mon=0,
                        .tm_mday=0,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=0,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="FAILURE"
                },
                .gmt_tm=                {
                        .tm_year=0,
                        .tm_mon=0,
                        .tm_mday=0,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=0,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="FAILURE"
                },
        },
        {
                .descr="min",
                .timezone="right/America/Edmonton",
                .time=INT64_MIN,
                .local_tm=              {
                        .tm_year=0,
                        .tm_mon=0,
                        .tm_mday=0,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=0,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="FAILURE"
                },
                .gmt_tm=                {
                        .tm_year=0,
                        .tm_mon=0,
                        .tm_mday=0,
                        .tm_hour=0,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=0,
                        .tm_yday=0,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="FAILURE"
                },
        },
        {
                .descr="maxint struct tm",
                .timezone="right/America/Edmonton",
                .time=67767976204675199,
                .local_tm=              {
                        .tm_year=2147481747,
                        .tm_mon=0,
                        .tm_mday=31,
                        .tm_hour=16,
                        .tm_min=59,
                        .tm_sec=32,
                        .tm_wday=4,
                        .tm_yday=30,
                        .tm_isdst=0,
                        .tm_gmtoff=-25200,
                        .tm_zone="MST"
                },
                .gmt_tm=                {
                        .tm_year=2147481747,
                        .tm_mon=0,
                        .tm_mday=31,
                        .tm_hour=23,
                        .tm_min=59,
                        .tm_sec=59,
                        .tm_wday=4,
                        .tm_yday=30,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="minint struct tm",
                .timezone="right/America/Edmonton",
                .time=-67768038398073601,
                .local_tm=              {
                        .tm_year=-2147483578,
                        .tm_mon=0,
                        .tm_mday=31,
                        .tm_hour=16,
                        .tm_min=26,
                        .tm_sec=7,
                        .tm_wday=2,
                        .tm_yday=30,
                        .tm_isdst=0,
                        .tm_gmtoff=-27232,
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                        .tm_yday=310,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="transition daylight to standard - 1",
                .timezone="right/America/Edmonton",
                .time=1478419225,
                .local_tm=              {
                        .tm_year=116,
                        .tm_mon=10,
                        .tm_mday=6,
                        .tm_hour=1,
                        .tm_min=59,
                        .tm_sec=59,
                        .tm_wday=0,
                        .tm_yday=310,
                        .tm_isdst=1,
                        .tm_gmtoff=-21600,
                        .tm_zone="MDT"
                },
                .gmt_tm=                {
                        .tm_year=116,
                        .tm_mon=10,
                        .tm_mday=6,
                        .tm_hour=8,
                        .tm_min=0,
                        .tm_sec=25,
                        .tm_wday=0,
                        .tm_yday=310,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="transition daylight to standard",
                .timezone="right/America/Edmonton",
                .time=1478419226,
                .local_tm=              {
                        .tm_year=116,
                        .tm_mon=10,
                        .tm_mday=6,
                        .tm_hour=1,
                        .tm_min=0,
                        .tm_sec=0,
                        .tm_wday=0,
                        .tm_yday=310,
                        .tm_isdst=0,
                        .tm_gmtoff=-25200,
                        .tm_zone="MST"
                },
                .gmt_tm=                {
                        .tm_year=116,
                        .tm_mon=10,
                        .tm_mday=6,
                        .tm_hour=8,
                        .tm_min=0,
                        .tm_sec=26,
                        .tm_wday=0,
                        .tm_yday=310,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr="transition daylight to standard + 1",
                .timezone="right/America/Edmonton",
                .time=1478419227,
                .local_tm=              {
                        .tm_year=116,
                        .tm_mon=10,
                        .tm_mday=6,
                        .tm_hour=1,
                        .tm_min=0,
                        .tm_sec=1,
                        .tm_wday=0,
                        .tm_yday=310,
                        .tm_isdst=0,
                        .tm_gmtoff=-25200,
                        .tm_zone="MST"
                },
                .gmt_tm=                {
                        .tm_year=116,
                        .tm_mon=10,
                        .tm_mday=6,
                        .tm_hour=8,
                        .tm_min=0,
                        .tm_sec=27,
                        .tm_wday=0,
                        .tm_yday=310,
                        .tm_isdst=0,
                        .tm_gmtoff=0,
                        .tm_zone="UTC"
                },
        },
        {
                .descr = NULL,
        },
};

void printtm(FILE *f, struct tm *tm)
{
        fprintf(f, "\t\t{\n\t\t\t.tm_year=%d,\n\t\t\t.tm_mon=%d,\n\t\t\t"
            ".tm_mday=%d,\n\t\t\t.tm_hour=%d,\n\t\t\t.tm_min=%d,\n\t\t\t"
            ".tm_sec=%d,\n\t\t\t.tm_wday=%d,\n\t\t\t.tm_yday=%d,\n\t\t\t"
            ".tm_isdst=%d,\n\t\t\t.tm_gmtoff=%ld,\n\t\t\t.tm_zone=\"%s\""
            "\n\t\t},\n",
            tm->tm_year,
            tm->tm_mon,
            tm->tm_mday,
            tm->tm_hour,
            tm->tm_min,
            tm->tm_sec,
            tm->tm_wday,
            tm->tm_yday,
            tm->tm_isdst,
            tm->tm_gmtoff,
            tm->tm_zone);
}

int dotimetest(struct timetest *test, int print)
{
        int failures = 0;
        struct tm local = {}, gmt = {};
        time_t converted;
        if (gmtime_r(&test->time, &gmt) == NULL) {
                memset(&gmt, 0, sizeof(gmt));
                gmt.tm_zone="FAILURE";
        } else {
                converted = timegm(&gmt);
                if (converted != test->time) {
                        fprintf(stderr, "FAIL: test \"%s\", tz \"%s\" timegm "
                            "does not match expected value\n", test->descr,
                            test->timezone);
                        fprintf(stderr, "expected: %lld\n", test->time);
                        fprintf(stderr, "actual: %lld\n", converted);
                        failures++;
                }
        }
        if (!tm_match(&test->gmt_tm, &gmt)) {
                fprintf(stderr, "FAIL: test \"%s\", tz \"%s\" gmtime_r does not"
                    " match expected value\n", test->descr, test->timezone);
                fprintf(stderr, "expected: ");
                printtm(stderr, &test->gmt_tm);
                fprintf(stderr, "actual: ");
                printtm(stderr, &gmt);
                failures++;
        }
        setenv("TZ", test->timezone, 1);
        if (localtime_r(&test->time, &local) == NULL) {
                memset(&local, 0, sizeof(local));
                local.tm_zone="FAILURE";
        } else {
                converted = mktime(&local);
                if (converted != test->time) {
                        fprintf(stderr, "FAIL: test \"%s\", tz \"%s\" mktime "
                            "does not match expected value\n", test->descr,
                            test->timezone);
                        fprintf(stderr, "expected: %lld\n", test->time);
                        fprintf(stderr, "actual: %lld\n", converted);
                        failures++;
                }
        }
        if (!tm_match(&test->local_tm, &local)) {
                fprintf(stderr, "FAIL: test \"%s\", tz \"%s\" localtime_r does "
                    "not match expected value\n", test->descr, test->timezone);
                fprintf(stderr, "expected: ");
                printtm(stderr, &test->local_tm);
                fprintf(stderr, "actual: ");
                printtm(stderr, &local);
                failures++;
        }
        if (print) {
                printf("\t{\n\t\t.descr=\"%s\",\n\t\t.timezone=\"%s\",\n\t\t"
                    ".time=%lld,\n", test->descr, test->timezone, test->time);
                printf("\t\t.local_tm=");
                printtm(stdout, &local);
                printf("\t\t.gmt_tm=");
                printtm(stdout, &gmt);
                printf("\t},\n");
        }
        return failures;
}


void printtmdescr(FILE *f, struct tm *tm, char * descr)
{
        fprintf(f, "%s: ", descr);
        printtm(f, tm);
}

int main() {
        int failures = 0;
        int verbose = 0;
        struct stat sb;
        size_t i;

        if (stat("/usr/share/zoneinfo/posix", &sb) == -1 ||
            stat("/usr/share/zoneinfo/right", &sb) == -1) {
                fprintf(stderr, "POSIX time zones missing, run the following command:\n\n"
                    "\tmake -C ../../../../../share/zoneinfo other_two\n\n"
                    "SKIPPED\n");
                exit(0);
        }

        for (i = 0; timetests[i].descr != NULL; i++) {
                failures += dotimetest(&timetests[i], verbose);
        }
        if (failures)
                fprintf(stderr, "FAIL:  %d time test failures\n", failures);
        else
                printf("SUCCESS: no time test failures\n");
        exit(failures);
}