/* $NetBSD: t_strptime.c,v 1.17 2024/03/26 21:52:23 rillig Exp $ */

/*-
 * Copyright (c) 1998, 2008 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by David Laight.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__COPYRIGHT("@(#) Copyright (c) 2008\
 The NetBSD Foundation, inc. All rights reserved.");
__RCSID("$NetBSD: t_strptime.c,v 1.17 2024/03/26 21:52:23 rillig Exp $");

#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#include <atf-c.h>

static void
h_pass(const char *buf, const char *fmt, int len,
    int tm_sec, int tm_min, int tm_hour, int tm_mday,
    int tm_mon, int tm_year, int tm_wday, int tm_yday)
{
        struct tm tm = { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, NULL };
        const char *ret, *exp;

        exp = buf + len;
        ret = strptime(buf, fmt, &tm);

        ATF_CHECK_MSG(ret == exp,
            "strptime(\"%s\", \"%s\", tm): incorrect return code: "
            "expected: %p, got: %p", buf, fmt, exp, ret);

#define H_REQUIRE_FIELD(field)                                          \
                ATF_CHECK_MSG(tm.field == field,                        \
                    "strptime(\"%s\", \"%s\", tm): incorrect %s: "      \
                    "expected: %d, but got: %d", buf, fmt,              \
                    ___STRING(field), field, tm.field)

        H_REQUIRE_FIELD(tm_sec);
        H_REQUIRE_FIELD(tm_min);
        H_REQUIRE_FIELD(tm_hour);
        H_REQUIRE_FIELD(tm_mday);
        H_REQUIRE_FIELD(tm_mon);
        H_REQUIRE_FIELD(tm_year);
        H_REQUIRE_FIELD(tm_wday);
        H_REQUIRE_FIELD(tm_yday);

#undef H_REQUIRE_FIELD
}

static void
h_fail(const char *buf, const char *fmt)
{
        struct tm tm = { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, NULL };

        ATF_CHECK_MSG(strptime(buf, fmt, &tm) == NULL, "strptime(\"%s\", "
            "\"%s\", &tm) should fail, but it didn't", buf, fmt);
}

static struct {
        const char *name;
        long offs;
} zt[] = {
        { "Z",                          0 },
        { "UT",                         0 },
        { "UTC",                        0 },
        { "GMT",                        0 },
        { "EST",                        -18000 },
        { "EDT",                        -14400 },
        { "CST",                        -21600 },
        { "CDT",                        -18000 },
        { "MST",                        -25200 },
        { "MDT",                        -21600 },
        { "PST",                        -28800 },
        { "PDT",                        -25200 },

        { "VST",                        -1 },
        { "VDT",                        -1 },

        { "+03",                        10800 },
        { "-03",                        -10800 },
        { "+0403",                      14580 },
        { "-0403",                      -14580 },
        { "+04:03",                     14580 },
        { "-04:03",                     -14580 },
        { "+14:00",                     50400 },
        { "-14:00",                     -50400 },
        { "+23:59",                     86340 },
        { "-23:59",                     -86340 },

        { "1",                          -1 },
        { "03",                         -1 },
        { "0304",                       -1 },
        { "+1",                         -1 },
        { "-203",                       -1 },
        { "+12345",                     -1 },
        { "+12:345",                    -1 },
        { "+123:45",                    -1 },
        { "+2400",                      -1 },
        { "-2400",                      -1 },
        { "+1060",                      -1 },
        { "-1060",                      -1 },

        { "A",                          3600 },
        { "B",                          7200 },
        { "C",                          10800 },
        { "D",                          14400 },
        { "E",                          18000 },
        { "F",                          21600 },
        { "G",                          25200 },
        { "H",                          28800 },
        { "I",                          32400 },
        { "L",                          39600 },
        { "M",                          43200 },
        { "N",                          -3600 },
        { "O",                          -7200 },
        { "P",                          -10800 },
        { "Q",                          -14400 },
        { "R",                          -18000 },
        { "T",                          -25200 },
        { "U",                          -28800 },
        { "V",                          -32400 },
        { "W",                          -36000 },
        { "X",                          -39600 },
        { "Y",                          -43200 },

        { "J",                          -2 },

        { "America/Los_Angeles",        -28800 },
        { "America/New_York",           -18000 },
        { "EST4EDT",                    -14400 },

        { "Bogus",                      -1 },
};

static void
ztest1(const char *name, const char *fmt, long value)
{
        struct tm tm;
        char *rv;

        memset(&tm, 0, sizeof(tm));
        if ((rv = strptime(name, fmt, &tm)) == NULL) 
                tm.tm_gmtoff = -1;
        else if (rv == name && fmt[1] == 'Z')
                value = 0;

        switch (value) {
        case -2:
                value = -timezone;
                break;
        case -1:
                if (fmt[1] == 'Z')
                        value = 0;
                break;
        default:
                break;
        }

        ATF_CHECK_MSG(tm.tm_gmtoff == value,
            "strptime(\"%s\", \"%s\", &tm): "
            "expected: tm.tm_gmtoff=%ld, got: tm.tm_gmtoff=%ld",
            name, fmt, value, tm.tm_gmtoff);
        printf("%s %s %ld\n", name, fmt, tm.tm_gmtoff);
}

static void
ztest(const char *fmt)
{
        setenv("TZ", "US/Eastern", 1);
        ztest1("GMT", fmt, 0);
        ztest1("UTC", fmt, 0);
        ztest1("US/Eastern", fmt, -18000);
        for (size_t i = 0; i < __arraycount(zt); i++)
                ztest1(zt[i].name, fmt, zt[i].offs);
}

ATF_TC(common);

ATF_TC_HEAD(common, tc)
{

        atf_tc_set_md_var(tc, "descr", "Checks strptime(3): various checks");
}

ATF_TC_BODY(common, tc)
{

        h_pass("Tue Jan 20 23:27:46 1998", "%a %b %d %T %Y",
                24, 46, 27, 23, 20, 0, 98, 2, 19);
        h_pass("Tue Jan 20 23:27:46 1998", "%a %b %d %H:%M:%S %Y",
                24, 46, 27, 23, 20, 0, 98, 2, 19);
        h_pass("Tue Jan 20 23:27:46 1998", "%c",
                24, 46, 27, 23, 20, 0, 98, 2, 19);
        h_pass("Fri Mar  4 20:05:34 2005", "%a %b %e %H:%M:%S %Y",
                24, 34, 5, 20, 4, 2, 105, 5, 62);
        h_pass("5\t3  4 8pm:05:34 2005", "%w%n%m%t%d%n%k%p:%M:%S %Y",
                21, 34, 5, 20, 4, 2, 105, 5, 62);
        h_pass("Fri Mar  4 20:05:34 2005", "%c",
                24, 34, 5, 20, 4, 2, 105, 5, 62);
}

ATF_TC(day);

ATF_TC_HEAD(day, tc)
{

        atf_tc_set_md_var(tc, "descr",
                          "Checks strptime(3) day name conversions [aA]");
}

ATF_TC_BODY(day, tc)
{

        h_pass("Sun", "%a", 3, -1, -1, -1, -1, -1, -1, 0, -1);
        h_pass("Sunday", "%a", 6, -1, -1, -1, -1, -1, -1, 0, -1);
        h_pass("Mon", "%a", 3, -1, -1, -1, -1, -1, -1, 1, -1);
        h_pass("Monday", "%a", 6, -1, -1, -1, -1, -1, -1, 1, -1);
        h_pass("Tue", "%a", 3, -1, -1, -1, -1, -1, -1, 2, -1);
        h_pass("Tuesday", "%a", 7, -1, -1, -1, -1, -1, -1, 2, -1);
        h_pass("Wed", "%a", 3, -1, -1, -1, -1, -1, -1, 3, -1);
        h_pass("Wednesday", "%a", 9, -1, -1, -1, -1, -1, -1, 3, -1);
        h_pass("Thu", "%a", 3, -1, -1, -1, -1, -1, -1, 4, -1);
        h_pass("Thursday", "%a", 8, -1, -1, -1, -1, -1, -1, 4, -1);
        h_pass("Fri", "%a", 3, -1, -1, -1, -1, -1, -1, 5, -1);
        h_pass("Friday", "%a", 6, -1, -1, -1, -1, -1, -1, 5, -1);
        h_pass("Sat", "%a", 3, -1, -1, -1, -1, -1, -1, 6, -1);
        h_pass("Saturday", "%a", 8, -1, -1, -1, -1, -1, -1, 6, -1);
        h_pass("Saturn", "%a", 3, -1, -1, -1, -1, -1, -1, 6, -1);
        h_fail("Moon", "%a");
        h_pass("Sun", "%A", 3, -1, -1, -1, -1, -1, -1, 0, -1);
        h_pass("Sunday", "%A", 6, -1, -1, -1, -1, -1, -1, 0, -1);
        h_pass("Mon", "%A", 3, -1, -1, -1, -1, -1, -1, 1, -1);
        h_pass("Monday", "%A", 6, -1, -1, -1, -1, -1, -1, 1, -1);
        h_pass("Tue", "%A", 3, -1, -1, -1, -1, -1, -1, 2, -1);
        h_pass("Tuesday", "%A", 7, -1, -1, -1, -1, -1, -1, 2, -1);
        h_pass("Wed", "%A", 3, -1, -1, -1, -1, -1, -1, 3, -1);
        h_pass("Wednesday", "%A", 9, -1, -1, -1, -1, -1, -1, 3, -1);
        h_pass("Thu", "%A", 3, -1, -1, -1, -1, -1, -1, 4, -1);
        h_pass("Thursday", "%A", 8, -1, -1, -1, -1, -1, -1, 4, -1);
        h_pass("Fri", "%A", 3, -1, -1, -1, -1, -1, -1, 5, -1);
        h_pass("Friday", "%A", 6, -1, -1, -1, -1, -1, -1, 5, -1);
        h_pass("Sat", "%A", 3, -1, -1, -1, -1, -1, -1, 6, -1);
        h_pass("Saturday", "%A", 8, -1, -1, -1, -1, -1, -1, 6, -1);
        h_pass("Saturn", "%A", 3, -1, -1, -1, -1, -1, -1, 6, -1);
        h_fail("Moon", "%A");

        h_pass("mon", "%a", 3, -1, -1, -1, -1, -1, -1, 1, -1);
        h_pass("tueSDay", "%A", 7, -1, -1, -1, -1, -1, -1, 2, -1);
        h_pass("sunday", "%A", 6, -1, -1, -1, -1, -1, -1, 0, -1);
        h_fail("sunday", "%EA");
        h_pass("SaturDay", "%A", 8, -1, -1, -1, -1, -1, -1, 6, -1);
        h_fail("SaturDay", "%OA");
}

ATF_TC(hour);

ATF_TC_HEAD(hour, tc)
{

        atf_tc_set_md_var(tc, "descr",
                          "Checks strptime(3) hour conversions [IH]");
}

ATF_TC_BODY(hour, tc)
{

        h_fail("00", "%I");
        h_fail("13", "%I");

        h_pass("00", "%H", 2, -1, -1, 0, -1, -1, -1, -1, -1);
        h_pass("12", "%H", 2, -1, -1, 12, -1, -1, -1, -1, -1);
        h_pass("23", "%H", 2, -1, -1, 23, -1, -1, -1, -1, -1);
        h_fail("24", "%H");
}


ATF_TC(month);

ATF_TC_HEAD(month, tc)
{

        atf_tc_set_md_var(tc, "descr",
                          "Checks strptime(3) month name conversions [bB]");
}

ATF_TC_BODY(month, tc)
{

        h_pass("Jan", "%b", 3, -1, -1, -1, -1, 0, -1, -1, -1);
        h_pass("January", "%b", 7, -1, -1, -1, -1, 0, -1, -1, -1);
        h_pass("Feb", "%b", 3, -1, -1, -1, -1, 1, -1, -1, -1);
        h_pass("February", "%b", 8, -1, -1, -1, -1, 1, -1, -1, -1);
        h_pass("Mar", "%b", 3, -1, -1, -1, -1, 2, -1, -1, -1);
        h_pass("March", "%b", 5, -1, -1, -1, -1, 2, -1, -1, -1);
        h_pass("Apr", "%b", 3, -1, -1, -1, -1, 3, -1, -1, -1);
        h_pass("April", "%b", 5, -1, -1, -1, -1, 3, -1, -1, -1);
        h_pass("May", "%b", 3, -1, -1, -1, -1, 4, -1, -1, -1);
        h_pass("Jun", "%b", 3, -1, -1, -1, -1, 5, -1, -1, -1);
        h_pass("June", "%b", 4, -1, -1, -1, -1, 5, -1, -1, -1);
        h_pass("Jul", "%b", 3, -1, -1, -1, -1, 6, -1, -1, -1);
        h_pass("July", "%b", 4, -1, -1, -1, -1, 6, -1, -1, -1);
        h_pass("Aug", "%b", 3, -1, -1, -1, -1, 7, -1, -1, -1);
        h_pass("August", "%b", 6, -1, -1, -1, -1, 7, -1, -1, -1);
        h_pass("Sep", "%b", 3, -1, -1, -1, -1, 8, -1, -1, -1);
        h_pass("September", "%b", 9, -1, -1, -1, -1, 8, -1, -1, -1);
        h_pass("Oct", "%b", 3, -1, -1, -1, -1, 9, -1, -1, -1);
        h_pass("October", "%b", 7, -1, -1, -1, -1, 9, -1, -1, -1);
        h_pass("Nov", "%b", 3, -1, -1, -1, -1, 10, -1, -1, -1);
        h_pass("November", "%b", 8, -1, -1, -1, -1, 10, -1, -1, -1);
        h_pass("Dec", "%b", 3, -1, -1, -1, -1, 11, -1, -1, -1);
        h_pass("December", "%b", 8, -1, -1, -1, -1, 11, -1, -1, -1);
        h_pass("Mayor", "%b", 3, -1, -1, -1, -1, 4, -1, -1, -1);
        h_pass("Mars", "%b", 3, -1, -1, -1, -1, 2, -1, -1, -1);
        h_fail("Rover", "%b");
        h_pass("Jan", "%B", 3, -1, -1, -1, -1, 0, -1, -1, -1);
        h_pass("January", "%B", 7, -1, -1, -1, -1, 0, -1, -1, -1);
        h_pass("Feb", "%B", 3, -1, -1, -1, -1, 1, -1, -1, -1);
        h_pass("February", "%B", 8, -1, -1, -1, -1, 1, -1, -1, -1);
        h_pass("Mar", "%B", 3, -1, -1, -1, -1, 2, -1, -1, -1);
        h_pass("March", "%B", 5, -1, -1, -1, -1, 2, -1, -1, -1);
        h_pass("Apr", "%B", 3, -1, -1, -1, -1, 3, -1, -1, -1);
        h_pass("April", "%B", 5, -1, -1, -1, -1, 3, -1, -1, -1);
        h_pass("May", "%B", 3, -1, -1, -1, -1, 4, -1, -1, -1);
        h_pass("Jun", "%B", 3, -1, -1, -1, -1, 5, -1, -1, -1);
        h_pass("June", "%B", 4, -1, -1, -1, -1, 5, -1, -1, -1);
        h_pass("Jul", "%B", 3, -1, -1, -1, -1, 6, -1, -1, -1);
        h_pass("July", "%B", 4, -1, -1, -1, -1, 6, -1, -1, -1);
        h_pass("Aug", "%B", 3, -1, -1, -1, -1, 7, -1, -1, -1);
        h_pass("August", "%B", 6, -1, -1, -1, -1, 7, -1, -1, -1);
        h_pass("Sep", "%B", 3, -1, -1, -1, -1, 8, -1, -1, -1);
        h_pass("September", "%B", 9, -1, -1, -1, -1, 8, -1, -1, -1);
        h_pass("Oct", "%B", 3, -1, -1, -1, -1, 9, -1, -1, -1);
        h_pass("October", "%B", 7, -1, -1, -1, -1, 9, -1, -1, -1);
        h_pass("Nov", "%B", 3, -1, -1, -1, -1, 10, -1, -1, -1);
        h_pass("November", "%B", 8, -1, -1, -1, -1, 10, -1, -1, -1);
        h_pass("Dec", "%B", 3, -1, -1, -1, -1, 11, -1, -1, -1);
        h_pass("December", "%B", 8, -1, -1, -1, -1, 11, -1, -1, -1);
        h_pass("Mayor", "%B", 3, -1, -1, -1, -1, 4, -1, -1, -1);
        h_pass("Mars", "%B", 3, -1, -1, -1, -1, 2, -1, -1, -1);
        h_fail("Rover", "%B");

        h_pass("september", "%b", 9, -1, -1, -1, -1, 8, -1, -1, -1);
        h_pass("septembe", "%B", 3, -1, -1, -1, -1, 8, -1, -1, -1);
}

ATF_TC(seconds);

ATF_TC_HEAD(seconds, tc)
{

        atf_tc_set_md_var(tc, "descr",
                          "Checks strptime(3) seconds conversions [S]");
}

ATF_TC_BODY(seconds, tc)
{

        h_pass("0", "%S", 1, 0, -1, -1, -1, -1, -1, -1, -1);
        h_pass("59", "%S", 2, 59, -1, -1, -1, -1, -1, -1, -1);
        h_pass("60", "%S", 2, 60, -1, -1, -1, -1, -1, -1, -1);
        h_pass("61", "%S", 2, 61, -1, -1, -1, -1, -1, -1, -1);
        h_fail("62", "%S");
}

ATF_TC(year);

ATF_TC_HEAD(year, tc)
{

        atf_tc_set_md_var(tc, "descr",
                          "Checks strptime(3) century/year conversions [CyY]");
}

ATF_TC_BODY(year, tc)
{

        h_pass("x20y", "x%Cy", 4, -1, -1, -1, -1, -1, 100, -1, -1);
        h_pass("x84y", "x%yy", 4, -1, -1, -1, -1, -1, 84, -1, -1);
        h_pass("x2084y", "x%C%yy", 6, -1, -1, -1, -1, -1, 184, -1, -1);
        h_pass("x8420y", "x%y%Cy", 6, -1, -1, -1, -1, -1, 184, -1, -1);
        h_pass("%20845", "%%%C%y5", 6, -1, -1, -1, -1, -1, 184, -1, -1);
        h_fail("%", "%E%");

        h_pass("1980", "%Y", 4, -1, -1, -1, -1, -1, 80, -1, -1);
        h_pass("1980", "%EY", 4, -1, -1, -1, -1, -1, 80, -1, -1);
}

ATF_TC(zone);

ATF_TC_HEAD(zone, tc)
{

        atf_tc_set_md_var(tc, "descr",
                          "Checks strptime(3) timezone conversion [z]");
}


ATF_TC_BODY(zone, tc)
{
        ztest("%z");
}

ATF_TC(Zone);

ATF_TC_HEAD(Zone, tc)
{

        atf_tc_set_md_var(tc, "descr",
                          "Checks strptime(3) timezone conversion [Z]");
}


ATF_TC_BODY(Zone, tc)
{
        ztest("%Z");
}

ATF_TC(posixtime_overflow);

ATF_TC_HEAD(posixtime_overflow, tc)
{

        atf_tc_set_md_var(tc, "descr",
            "Checks strptime(3) safely rejects POSIX time overflow");
}

ATF_TC_BODY(posixtime_overflow, tc)
{
        static const uint64_t P[] = { /* cases that should pass round-trip */
                [0] = 0,
                [1] = 1,
                [2] = 2,
                [3] = 0x7ffffffe,
                [4] = 0x7fffffff,
                [5] = 0x80000000,
                [6] = 0x80000001,
                [7] = 0xfffffffe,
                [8] = 0xffffffff,
                [9] = 0x100000000,
                [10] = 0x100000001,
                [11] = 67767976233532799, /* 2147483647-12-31T23:59:59 */
                /*
                 * Beyond this point, the year (.tm_year + 1900)
                 * overflows the signed 32-bit range, so we won't be
                 * able to test round-trips:
                 */
                [12] = 67767976233532800,
                [13] = 67767976233532801,
                [14] = 67768036191676799,
                /*
                 * Beyond this point, .tm_year itself overflows the
                 * signed 32-bit range, so strptime won't work at all;
                 * the output can't be represented in struct tm.
                 */
#if 0
                [15] = 67768036191676800,
                [16] = 67768036191676801,
                [17] = 0x7ffffffffffffffe,
                [18] = 0x7fffffffffffffff,
#endif
        };
        static const uint64_t F[] = { /* cases strptime should reject */
                [0] = 67768036191676800,
                [1] = 67768036191676801,
                [2] = 0x7ffffffffffffffe,
                [3] = 0x7fffffffffffffff,
                [4] = 0x8000000000000000,
                [5] = 0x8000000000000001,
                [6] = 0xfffffffffffffffe,
                [7] = 0xffffffffffffffff,
        };
        size_t i;

        /*
         * Verify time_t fits in uint64_t, with space to spare since
         * it's signed.
         */
        __CTASSERT(__type_max(time_t) < __type_max(uint64_t));

        /*
         * Make sure we work in UTC so this test doesn't depend on
         * which time zone your machine is configured for.
         */
        setenv("TZ", "UTC", 1);

        /*
         * Check the should-pass cases.
         */
        for (i = 0; i < __arraycount(P); i++) {
                char buf[sizeof("18446744073709551616")];
                int n;
                struct tm tm;
                time_t t;
                int error;

                /*
                 * Format the integer in decimal.
                 */
                n = snprintf(buf, sizeof(buf), "%"PRIu64, P[i]);
                ATF_CHECK_MSG(n >= 0 && (unsigned)n < sizeof(buf),
                    "P[%zu]: 64-bit requires %d digits", i, n);

                /*
                 * Parse the time into components.
                 */
                fprintf(stderr, "# P[%zu]: %"PRId64"\n", i, P[i]);
                if (strptime(buf, "%s", &tm) == NULL) {
                        atf_tc_fail_nonfatal("P[%zu]: strptime failed", i);
                        continue;
                }
                fprintf(stderr, "tm_sec=%d\n", tm.tm_sec);
                fprintf(stderr, "tm_min=%d\n", tm.tm_min);
                fprintf(stderr, "tm_hour=%d\n", tm.tm_hour);
                fprintf(stderr, "tm_mday=%d\n", tm.tm_mday);
                fprintf(stderr, "tm_mon=%d\n", tm.tm_mon);
                fprintf(stderr, "tm_year=%d\n", tm.tm_year);
                fprintf(stderr, "tm_wday=%d\n", tm.tm_wday);
                fprintf(stderr, "tm_yday=%d\n", tm.tm_yday);
                fprintf(stderr, "tm_isdst=%d\n", tm.tm_isdst);
                fprintf(stderr, "tm_gmtoff=%ld\n", tm.tm_gmtoff);
                fprintf(stderr, "tm_zone=%s\n", tm.tm_zone);

                /*
                 * Convert back to POSIX seconds since epoch -- unless
                 * the year number overflows signed 32-bit, in which
                 * case stop here because we can't test further.
                 */
                if (tm.tm_year > 0x7fffffff - 1900)
                        continue;
                t = mktime(&tm);
                error = errno;
                ATF_CHECK_MSG(t != -1, "P[%zu]: mktime failed: %d, %s",
                    i, error, strerror(error));

                /*
                 * Verify the round-trip.
                 */
                ATF_CHECK_EQ_MSG(P[i], (uint64_t)t,
                    "P[%zu]: %"PRId64" -> %"PRId64, i, P[i], (int64_t)t);
        }

        /*
         * Check the should-fail cases.
         */
        for (i = 0; i < __arraycount(F); i++) {
                char buf[sizeof("18446744073709551616")];
                int n;

                /*
                 * Format the integer in decimal.
                 */
                n = snprintf(buf, sizeof(buf), "%"PRIu64, F[i]);
                ATF_CHECK_MSG(n >= 0 && (unsigned)n < sizeof(buf),
                    "F[%zu]: 64-bit requires %d digits", i, n);

                /*
                 * Verify strptime rejects this.
                 */
                h_fail(buf, "%s");
        }
}

ATF_TP_ADD_TCS(tp)
{

        ATF_TP_ADD_TC(tp, common);
        ATF_TP_ADD_TC(tp, day);
        ATF_TP_ADD_TC(tp, hour);
        ATF_TP_ADD_TC(tp, month);
        ATF_TP_ADD_TC(tp, seconds);
        ATF_TP_ADD_TC(tp, year);
        ATF_TP_ADD_TC(tp, zone);
        ATF_TP_ADD_TC(tp, Zone);
        ATF_TP_ADD_TC(tp, posixtime_overflow);

        return atf_no_error();
}