5a58064311
[BZ#23745] This fix affects only Gnulib. Problem discovered when mktime.c was used as part of Gnulib in bleeding-edge Coreutils. * time/mktime.c: (my_tzset) [!_LIBC && !NEED_MKTIME_WORKING && !NEED_MKTIME_WINDOWS]: Do not define since it is not used. Defining an unused static function prompts a warning from GCC when Coreutils is configured with --enable-gcc-warnings.
691 lines
22 KiB
C
691 lines
22 KiB
C
/* Convert a 'struct tm' to a time_t value.
|
||
Copyright (C) 1993-2018 Free Software Foundation, Inc.
|
||
This file is part of the GNU C Library.
|
||
Contributed by Paul Eggert <eggert@twinsun.com>.
|
||
|
||
The GNU C Library 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.
|
||
|
||
The GNU C Library is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
Lesser General Public License for more details.
|
||
|
||
You should have received a copy of the GNU Lesser General Public
|
||
License along with the GNU C Library; if not, see
|
||
<https://www.gnu.org/licenses/>. */
|
||
|
||
/* Define this to 1 to have a standalone program to test this implementation of
|
||
mktime. */
|
||
#ifndef DEBUG_MKTIME
|
||
# define DEBUG_MKTIME 0
|
||
#endif
|
||
|
||
/* The following macros influence what gets defined when this file is compiled:
|
||
|
||
Macro/expression Which gnulib module This compilation unit
|
||
should define
|
||
|
||
_LIBC (glibc proper) mktime
|
||
|
||
NEED_MKTIME_WORKING mktime rpl_mktime
|
||
|| NEED_MKTIME_WINDOWS
|
||
|
||
NEED_MKTIME_INTERNAL mktime-internal mktime_internal
|
||
|
||
DEBUG_MKTIME (defined manually) my_mktime, main
|
||
*/
|
||
|
||
#if !defined _LIBC && !DEBUG_MKTIME
|
||
# include <config.h>
|
||
#endif
|
||
|
||
/* Assume that leap seconds are possible, unless told otherwise.
|
||
If the host has a 'zic' command with a '-L leapsecondfilename' option,
|
||
then it supports leap seconds; otherwise it probably doesn't. */
|
||
#ifndef LEAP_SECONDS_POSSIBLE
|
||
# define LEAP_SECONDS_POSSIBLE 1
|
||
#endif
|
||
|
||
#include <time.h>
|
||
|
||
#include <limits.h>
|
||
#include <stdbool.h>
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
|
||
#include <intprops.h>
|
||
#include <verify.h>
|
||
|
||
#if DEBUG_MKTIME
|
||
# include <stdio.h>
|
||
/* Make it work even if the system's libc has its own mktime routine. */
|
||
# undef mktime
|
||
# define mktime my_mktime
|
||
#endif /* DEBUG_MKTIME */
|
||
|
||
#ifndef NEED_MKTIME_INTERNAL
|
||
# define NEED_MKTIME_INTERNAL 0
|
||
#endif
|
||
#ifndef NEED_MKTIME_WINDOWS
|
||
# define NEED_MKTIME_WINDOWS 0
|
||
#endif
|
||
#ifndef NEED_MKTIME_WORKING
|
||
# define NEED_MKTIME_WORKING DEBUG_MKTIME
|
||
#endif
|
||
|
||
#include "mktime-internal.h"
|
||
|
||
#if !defined _LIBC && (NEED_MKTIME_WORKING || NEED_MKTIME_WINDOWS)
|
||
static void
|
||
my_tzset (void)
|
||
{
|
||
# if NEED_MKTIME_WINDOWS
|
||
/* Rectify the value of the environment variable TZ.
|
||
There are four possible kinds of such values:
|
||
- Traditional US time zone names, e.g. "PST8PDT". Syntax: see
|
||
<https://msdn.microsoft.com/en-us/library/90s5c885.aspx>
|
||
- Time zone names based on geography, that contain one or more
|
||
slashes, e.g. "Europe/Moscow".
|
||
- Time zone names based on geography, without slashes, e.g.
|
||
"Singapore".
|
||
- Time zone names that contain explicit DST rules. Syntax: see
|
||
<http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag_08_03>
|
||
The Microsoft CRT understands only the first kind. It produces incorrect
|
||
results if the value of TZ is of the other kinds.
|
||
But in a Cygwin environment, /etc/profile.d/tzset.sh sets TZ to a value
|
||
of the second kind for most geographies, or of the first kind in a few
|
||
other geographies. If it is of the second kind, neutralize it. For the
|
||
Microsoft CRT, an absent or empty TZ means the time zone that the user
|
||
has set in the Windows Control Panel.
|
||
If the value of TZ is of the third or fourth kind -- Cygwin programs
|
||
understand these syntaxes as well --, it does not matter whether we
|
||
neutralize it or not, since these values occur only when a Cygwin user
|
||
has set TZ explicitly; this case is 1. rare and 2. under the user's
|
||
responsibility. */
|
||
const char *tz = getenv ("TZ");
|
||
if (tz != NULL && strchr (tz, '/') != NULL)
|
||
_putenv ("TZ=");
|
||
# elif HAVE_TZSET
|
||
tzset ();
|
||
# endif
|
||
}
|
||
# undef __tzset
|
||
# define __tzset() my_tzset ()
|
||
#endif
|
||
|
||
#if defined _LIBC || NEED_MKTIME_WORKING || NEED_MKTIME_INTERNAL
|
||
|
||
/* A signed type that can represent an integer number of years
|
||
multiplied by three times the number of seconds in a year. It is
|
||
needed when converting a tm_year value times the number of seconds
|
||
in a year. The factor of three comes because these products need
|
||
to be subtracted from each other, and sometimes with an offset
|
||
added to them, without worrying about overflow.
|
||
|
||
Much of the code uses long_int to represent time_t values, to
|
||
lessen the hassle of dealing with platforms where time_t is
|
||
unsigned, and because long_int should suffice to represent all
|
||
time_t values that mktime can generate even on platforms where
|
||
time_t is excessively wide. */
|
||
|
||
#if INT_MAX <= LONG_MAX / 3 / 366 / 24 / 60 / 60
|
||
typedef long int long_int;
|
||
#else
|
||
typedef long long int long_int;
|
||
#endif
|
||
verify (INT_MAX <= TYPE_MAXIMUM (long_int) / 3 / 366 / 24 / 60 / 60);
|
||
|
||
/* Shift A right by B bits portably, by dividing A by 2**B and
|
||
truncating towards minus infinity. B should be in the range 0 <= B
|
||
<= LONG_INT_BITS - 2, where LONG_INT_BITS is the number of useful
|
||
bits in a long_int. LONG_INT_BITS is at least 32.
|
||
|
||
ISO C99 says that A >> B is implementation-defined if A < 0. Some
|
||
implementations (e.g., UNICOS 9.0 on a Cray Y-MP EL) don't shift
|
||
right in the usual way when A < 0, so SHR falls back on division if
|
||
ordinary A >> B doesn't seem to be the usual signed shift. */
|
||
|
||
static long_int
|
||
shr (long_int a, int b)
|
||
{
|
||
long_int one = 1;
|
||
return (-one >> 1 == -1
|
||
? a >> b
|
||
: a / (one << b) - (a % (one << b) < 0));
|
||
}
|
||
|
||
/* Bounds for the intersection of time_t and long_int. */
|
||
|
||
static long_int const mktime_min
|
||
= ((TYPE_SIGNED (time_t) && TYPE_MINIMUM (time_t) < TYPE_MINIMUM (long_int))
|
||
? TYPE_MINIMUM (long_int) : TYPE_MINIMUM (time_t));
|
||
static long_int const mktime_max
|
||
= (TYPE_MAXIMUM (long_int) < TYPE_MAXIMUM (time_t)
|
||
? TYPE_MAXIMUM (long_int) : TYPE_MAXIMUM (time_t));
|
||
|
||
verify (TYPE_IS_INTEGER (time_t));
|
||
|
||
#define EPOCH_YEAR 1970
|
||
#define TM_YEAR_BASE 1900
|
||
verify (TM_YEAR_BASE % 100 == 0);
|
||
|
||
/* Is YEAR + TM_YEAR_BASE a leap year? */
|
||
static bool
|
||
leapyear (long_int year)
|
||
{
|
||
/* Don't add YEAR to TM_YEAR_BASE, as that might overflow.
|
||
Also, work even if YEAR is negative. */
|
||
return
|
||
((year & 3) == 0
|
||
&& (year % 100 != 0
|
||
|| ((year / 100) & 3) == (- (TM_YEAR_BASE / 100) & 3)));
|
||
}
|
||
|
||
/* How many days come before each month (0-12). */
|
||
#ifndef _LIBC
|
||
static
|
||
#endif
|
||
const unsigned short int __mon_yday[2][13] =
|
||
{
|
||
/* Normal years. */
|
||
{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
|
||
/* Leap years. */
|
||
{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
|
||
};
|
||
|
||
|
||
/* Do the values A and B differ according to the rules for tm_isdst?
|
||
A and B differ if one is zero and the other positive. */
|
||
static bool
|
||
isdst_differ (int a, int b)
|
||
{
|
||
return (!a != !b) && (0 <= a) && (0 <= b);
|
||
}
|
||
|
||
/* Return an integer value measuring (YEAR1-YDAY1 HOUR1:MIN1:SEC1) -
|
||
(YEAR0-YDAY0 HOUR0:MIN0:SEC0) in seconds, assuming that the clocks
|
||
were not adjusted between the timestamps.
|
||
|
||
The YEAR values uses the same numbering as TP->tm_year. Values
|
||
need not be in the usual range. However, YEAR1 must not overflow
|
||
when multiplied by three times the number of seconds in a year, and
|
||
likewise for YDAY1 and three times the number of seconds in a day. */
|
||
|
||
static long_int
|
||
ydhms_diff (long_int year1, long_int yday1, int hour1, int min1, int sec1,
|
||
int year0, int yday0, int hour0, int min0, int sec0)
|
||
{
|
||
verify (-1 / 2 == 0);
|
||
|
||
/* Compute intervening leap days correctly even if year is negative.
|
||
Take care to avoid integer overflow here. */
|
||
int a4 = shr (year1, 2) + shr (TM_YEAR_BASE, 2) - ! (year1 & 3);
|
||
int b4 = shr (year0, 2) + shr (TM_YEAR_BASE, 2) - ! (year0 & 3);
|
||
int a100 = a4 / 25 - (a4 % 25 < 0);
|
||
int b100 = b4 / 25 - (b4 % 25 < 0);
|
||
int a400 = shr (a100, 2);
|
||
int b400 = shr (b100, 2);
|
||
int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
|
||
|
||
/* Compute the desired time without overflowing. */
|
||
long_int years = year1 - year0;
|
||
long_int days = 365 * years + yday1 - yday0 + intervening_leap_days;
|
||
long_int hours = 24 * days + hour1 - hour0;
|
||
long_int minutes = 60 * hours + min1 - min0;
|
||
long_int seconds = 60 * minutes + sec1 - sec0;
|
||
return seconds;
|
||
}
|
||
|
||
/* Return the average of A and B, even if A + B would overflow.
|
||
Round toward positive infinity. */
|
||
static long_int
|
||
long_int_avg (long_int a, long_int b)
|
||
{
|
||
return shr (a, 1) + shr (b, 1) + ((a | b) & 1);
|
||
}
|
||
|
||
/* Return a time_t value corresponding to (YEAR-YDAY HOUR:MIN:SEC),
|
||
assuming that T corresponds to *TP and that no clock adjustments
|
||
occurred between *TP and the desired time.
|
||
Although T and the returned value are of type long_int,
|
||
they represent time_t values and must be in time_t range.
|
||
If TP is null, return a value not equal to T; this avoids false matches.
|
||
YEAR and YDAY must not be so large that multiplying them by three times the
|
||
number of seconds in a year (or day, respectively) would overflow long_int.
|
||
If the returned value would be out of range, yield the minimal or
|
||
maximal in-range value, except do not yield a value equal to T. */
|
||
static long_int
|
||
guess_time_tm (long_int year, long_int yday, int hour, int min, int sec,
|
||
long_int t, const struct tm *tp)
|
||
{
|
||
if (tp)
|
||
{
|
||
long_int result;
|
||
long_int d = ydhms_diff (year, yday, hour, min, sec,
|
||
tp->tm_year, tp->tm_yday,
|
||
tp->tm_hour, tp->tm_min, tp->tm_sec);
|
||
if (! INT_ADD_WRAPV (t, d, &result))
|
||
return result;
|
||
}
|
||
|
||
/* Overflow occurred one way or another. Return the nearest result
|
||
that is actually in range, except don't report a zero difference
|
||
if the actual difference is nonzero, as that would cause a false
|
||
match; and don't oscillate between two values, as that would
|
||
confuse the spring-forward gap detector. */
|
||
return (t < long_int_avg (mktime_min, mktime_max)
|
||
? (t <= mktime_min + 1 ? t + 1 : mktime_min)
|
||
: (mktime_max - 1 <= t ? t - 1 : mktime_max));
|
||
}
|
||
|
||
/* Use CONVERT to convert T to a struct tm value in *TM. T must be in
|
||
range for time_t. Return TM if successful, NULL if T is out of
|
||
range for CONVERT. */
|
||
static struct tm *
|
||
convert_time (struct tm *(*convert) (const time_t *, struct tm *),
|
||
long_int t, struct tm *tm)
|
||
{
|
||
time_t x = t;
|
||
return convert (&x, tm);
|
||
}
|
||
|
||
/* Use CONVERT to convert *T to a broken down time in *TP.
|
||
If *T is out of range for conversion, adjust it so that
|
||
it is the nearest in-range value and then convert that.
|
||
A value is in range if it fits in both time_t and long_int. */
|
||
static struct tm *
|
||
ranged_convert (struct tm *(*convert) (const time_t *, struct tm *),
|
||
long_int *t, struct tm *tp)
|
||
{
|
||
struct tm *r;
|
||
if (*t < mktime_min)
|
||
*t = mktime_min;
|
||
else if (mktime_max < *t)
|
||
*t = mktime_max;
|
||
r = convert_time (convert, *t, tp);
|
||
|
||
if (!r && *t)
|
||
{
|
||
long_int bad = *t;
|
||
long_int ok = 0;
|
||
|
||
/* BAD is a known unconvertible value, and OK is a known good one.
|
||
Use binary search to narrow the range between BAD and OK until
|
||
they differ by 1. */
|
||
while (true)
|
||
{
|
||
long_int mid = long_int_avg (ok, bad);
|
||
if (mid != ok && mid != bad)
|
||
break;
|
||
r = convert_time (convert, mid, tp);
|
||
if (r)
|
||
ok = mid;
|
||
else
|
||
bad = mid;
|
||
}
|
||
|
||
if (!r && ok)
|
||
{
|
||
/* The last conversion attempt failed;
|
||
revert to the most recent successful attempt. */
|
||
r = convert_time (convert, ok, tp);
|
||
}
|
||
}
|
||
|
||
return r;
|
||
}
|
||
|
||
|
||
/* Convert *TP to a time_t value, inverting
|
||
the monotonic and mostly-unit-linear conversion function CONVERT.
|
||
Use *OFFSET to keep track of a guess at the offset of the result,
|
||
compared to what the result would be for UTC without leap seconds.
|
||
If *OFFSET's guess is correct, only one CONVERT call is needed.
|
||
This function is external because it is used also by timegm.c. */
|
||
time_t
|
||
__mktime_internal (struct tm *tp,
|
||
struct tm *(*convert) (const time_t *, struct tm *),
|
||
mktime_offset_t *offset)
|
||
{
|
||
long_int t, gt, t0, t1, t2, dt;
|
||
struct tm tm;
|
||
|
||
/* The maximum number of probes (calls to CONVERT) should be enough
|
||
to handle any combinations of time zone rule changes, solar time,
|
||
leap seconds, and oscillations around a spring-forward gap.
|
||
POSIX.1 prohibits leap seconds, but some hosts have them anyway. */
|
||
int remaining_probes = 6;
|
||
|
||
/* Time requested. Copy it in case CONVERT modifies *TP; this can
|
||
occur if TP is localtime's returned value and CONVERT is localtime. */
|
||
int sec = tp->tm_sec;
|
||
int min = tp->tm_min;
|
||
int hour = tp->tm_hour;
|
||
int mday = tp->tm_mday;
|
||
int mon = tp->tm_mon;
|
||
int year_requested = tp->tm_year;
|
||
int isdst = tp->tm_isdst;
|
||
|
||
/* 1 if the previous probe was DST. */
|
||
int dst2;
|
||
|
||
/* Ensure that mon is in range, and set year accordingly. */
|
||
int mon_remainder = mon % 12;
|
||
int negative_mon_remainder = mon_remainder < 0;
|
||
int mon_years = mon / 12 - negative_mon_remainder;
|
||
long_int lyear_requested = year_requested;
|
||
long_int year = lyear_requested + mon_years;
|
||
|
||
/* The other values need not be in range:
|
||
the remaining code handles overflows correctly. */
|
||
|
||
/* Calculate day of year from year, month, and day of month.
|
||
The result need not be in range. */
|
||
int mon_yday = ((__mon_yday[leapyear (year)]
|
||
[mon_remainder + 12 * negative_mon_remainder])
|
||
- 1);
|
||
long_int lmday = mday;
|
||
long_int yday = mon_yday + lmday;
|
||
|
||
mktime_offset_t off = *offset;
|
||
int negative_offset_guess;
|
||
|
||
int sec_requested = sec;
|
||
|
||
if (LEAP_SECONDS_POSSIBLE)
|
||
{
|
||
/* Handle out-of-range seconds specially,
|
||
since ydhms_tm_diff assumes every minute has 60 seconds. */
|
||
if (sec < 0)
|
||
sec = 0;
|
||
if (59 < sec)
|
||
sec = 59;
|
||
}
|
||
|
||
/* Invert CONVERT by probing. First assume the same offset as last
|
||
time. */
|
||
|
||
INT_SUBTRACT_WRAPV (0, off, &negative_offset_guess);
|
||
t0 = ydhms_diff (year, yday, hour, min, sec,
|
||
EPOCH_YEAR - TM_YEAR_BASE, 0, 0, 0, negative_offset_guess);
|
||
|
||
/* Repeatedly use the error to improve the guess. */
|
||
|
||
for (t = t1 = t2 = t0, dst2 = 0;
|
||
(gt = guess_time_tm (year, yday, hour, min, sec, t,
|
||
ranged_convert (convert, &t, &tm)),
|
||
t != gt);
|
||
t1 = t2, t2 = t, t = gt, dst2 = tm.tm_isdst != 0)
|
||
if (t == t1 && t != t2
|
||
&& (tm.tm_isdst < 0
|
||
|| (isdst < 0
|
||
? dst2 <= (tm.tm_isdst != 0)
|
||
: (isdst != 0) != (tm.tm_isdst != 0))))
|
||
/* We can't possibly find a match, as we are oscillating
|
||
between two values. The requested time probably falls
|
||
within a spring-forward gap of size GT - T. Follow the common
|
||
practice in this case, which is to return a time that is GT - T
|
||
away from the requested time, preferring a time whose
|
||
tm_isdst differs from the requested value. (If no tm_isdst
|
||
was requested and only one of the two values has a nonzero
|
||
tm_isdst, prefer that value.) In practice, this is more
|
||
useful than returning -1. */
|
||
goto offset_found;
|
||
else if (--remaining_probes == 0)
|
||
return -1;
|
||
|
||
/* We have a match. Check whether tm.tm_isdst has the requested
|
||
value, if any. */
|
||
if (isdst_differ (isdst, tm.tm_isdst))
|
||
{
|
||
/* tm.tm_isdst has the wrong value. Look for a neighboring
|
||
time with the right value, and use its UTC offset.
|
||
|
||
Heuristic: probe the adjacent timestamps in both directions,
|
||
looking for the desired isdst. This should work for all real
|
||
time zone histories in the tz database. */
|
||
|
||
/* Distance between probes when looking for a DST boundary. In
|
||
tzdata2003a, the shortest period of DST is 601200 seconds
|
||
(e.g., America/Recife starting 2000-10-08 01:00), and the
|
||
shortest period of non-DST surrounded by DST is 694800
|
||
seconds (Africa/Tunis starting 1943-04-17 01:00). Use the
|
||
minimum of these two values, so we don't miss these short
|
||
periods when probing. */
|
||
int stride = 601200;
|
||
|
||
/* The longest period of DST in tzdata2003a is 536454000 seconds
|
||
(e.g., America/Jujuy starting 1946-10-01 01:00). The longest
|
||
period of non-DST is much longer, but it makes no real sense
|
||
to search for more than a year of non-DST, so use the DST
|
||
max. */
|
||
int duration_max = 536454000;
|
||
|
||
/* Search in both directions, so the maximum distance is half
|
||
the duration; add the stride to avoid off-by-1 problems. */
|
||
int delta_bound = duration_max / 2 + stride;
|
||
|
||
int delta, direction;
|
||
|
||
for (delta = stride; delta < delta_bound; delta += stride)
|
||
for (direction = -1; direction <= 1; direction += 2)
|
||
{
|
||
long_int ot;
|
||
if (! INT_ADD_WRAPV (t, delta * direction, &ot))
|
||
{
|
||
struct tm otm;
|
||
ranged_convert (convert, &ot, &otm);
|
||
if (! isdst_differ (isdst, otm.tm_isdst))
|
||
{
|
||
/* We found the desired tm_isdst.
|
||
Extrapolate back to the desired time. */
|
||
t = guess_time_tm (year, yday, hour, min, sec, ot, &otm);
|
||
ranged_convert (convert, &t, &tm);
|
||
goto offset_found;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
offset_found:
|
||
/* Set *OFFSET to the low-order bits of T - T0 - NEGATIVE_OFFSET_GUESS.
|
||
This is just a heuristic to speed up the next mktime call, and
|
||
correctness is unaffected if integer overflow occurs here. */
|
||
INT_SUBTRACT_WRAPV (t, t0, &dt);
|
||
INT_SUBTRACT_WRAPV (dt, negative_offset_guess, offset);
|
||
|
||
if (LEAP_SECONDS_POSSIBLE && sec_requested != tm.tm_sec)
|
||
{
|
||
/* Adjust time to reflect the tm_sec requested, not the normalized value.
|
||
Also, repair any damage from a false match due to a leap second. */
|
||
long_int sec_adjustment = sec == 0 && tm.tm_sec == 60;
|
||
sec_adjustment -= sec;
|
||
sec_adjustment += sec_requested;
|
||
if (INT_ADD_WRAPV (t, sec_adjustment, &t)
|
||
|| ! (mktime_min <= t && t <= mktime_max)
|
||
|| ! convert_time (convert, t, &tm))
|
||
return -1;
|
||
}
|
||
|
||
*tp = tm;
|
||
return t;
|
||
}
|
||
|
||
#endif /* _LIBC || NEED_MKTIME_WORKING || NEED_MKTIME_INTERNAL */
|
||
|
||
#if defined _LIBC || NEED_MKTIME_WORKING || NEED_MKTIME_WINDOWS
|
||
|
||
/* Convert *TP to a time_t value. */
|
||
time_t
|
||
mktime (struct tm *tp)
|
||
{
|
||
/* POSIX.1 8.1.1 requires that whenever mktime() is called, the
|
||
time zone names contained in the external variable 'tzname' shall
|
||
be set as if the tzset() function had been called. */
|
||
__tzset ();
|
||
|
||
# if defined _LIBC || NEED_MKTIME_WORKING
|
||
static mktime_offset_t localtime_offset;
|
||
return __mktime_internal (tp, __localtime_r, &localtime_offset);
|
||
# else
|
||
# undef mktime
|
||
return mktime (tp);
|
||
# endif
|
||
}
|
||
#endif /* _LIBC || NEED_MKTIME_WORKING || NEED_MKTIME_WINDOWS */
|
||
|
||
#ifdef weak_alias
|
||
weak_alias (mktime, timelocal)
|
||
#endif
|
||
|
||
#ifdef _LIBC
|
||
libc_hidden_def (mktime)
|
||
libc_hidden_weak (timelocal)
|
||
#endif
|
||
|
||
#if DEBUG_MKTIME
|
||
|
||
static int
|
||
not_equal_tm (const struct tm *a, const struct tm *b)
|
||
{
|
||
return ((a->tm_sec ^ b->tm_sec)
|
||
| (a->tm_min ^ b->tm_min)
|
||
| (a->tm_hour ^ b->tm_hour)
|
||
| (a->tm_mday ^ b->tm_mday)
|
||
| (a->tm_mon ^ b->tm_mon)
|
||
| (a->tm_year ^ b->tm_year)
|
||
| (a->tm_yday ^ b->tm_yday)
|
||
| isdst_differ (a->tm_isdst, b->tm_isdst));
|
||
}
|
||
|
||
static void
|
||
print_tm (const struct tm *tp)
|
||
{
|
||
if (tp)
|
||
printf ("%04d-%02d-%02d %02d:%02d:%02d yday %03d wday %d isdst %d",
|
||
tp->tm_year + TM_YEAR_BASE, tp->tm_mon + 1, tp->tm_mday,
|
||
tp->tm_hour, tp->tm_min, tp->tm_sec,
|
||
tp->tm_yday, tp->tm_wday, tp->tm_isdst);
|
||
else
|
||
printf ("0");
|
||
}
|
||
|
||
static int
|
||
check_result (time_t tk, struct tm tmk, time_t tl, const struct tm *lt)
|
||
{
|
||
if (tk != tl || !lt || not_equal_tm (&tmk, lt))
|
||
{
|
||
printf ("mktime (");
|
||
print_tm (lt);
|
||
printf (")\nyields (");
|
||
print_tm (&tmk);
|
||
printf (") == %ld, should be %ld\n", (long int) tk, (long int) tl);
|
||
return 1;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
main (int argc, char **argv)
|
||
{
|
||
int status = 0;
|
||
struct tm tm, tmk, tml;
|
||
struct tm *lt;
|
||
time_t tk, tl, tl1;
|
||
char trailer;
|
||
|
||
/* Sanity check, plus call tzset. */
|
||
tl = 0;
|
||
if (! localtime (&tl))
|
||
{
|
||
printf ("localtime (0) fails\n");
|
||
status = 1;
|
||
}
|
||
|
||
if ((argc == 3 || argc == 4)
|
||
&& (sscanf (argv[1], "%d-%d-%d%c",
|
||
&tm.tm_year, &tm.tm_mon, &tm.tm_mday, &trailer)
|
||
== 3)
|
||
&& (sscanf (argv[2], "%d:%d:%d%c",
|
||
&tm.tm_hour, &tm.tm_min, &tm.tm_sec, &trailer)
|
||
== 3))
|
||
{
|
||
tm.tm_year -= TM_YEAR_BASE;
|
||
tm.tm_mon--;
|
||
tm.tm_isdst = argc == 3 ? -1 : atoi (argv[3]);
|
||
tmk = tm;
|
||
tl = mktime (&tmk);
|
||
lt = localtime_r (&tl, &tml);
|
||
printf ("mktime returns %ld == ", (long int) tl);
|
||
print_tm (&tmk);
|
||
printf ("\n");
|
||
status = check_result (tl, tmk, tl, lt);
|
||
}
|
||
else if (argc == 4 || (argc == 5 && strcmp (argv[4], "-") == 0))
|
||
{
|
||
time_t from = atol (argv[1]);
|
||
time_t by = atol (argv[2]);
|
||
time_t to = atol (argv[3]);
|
||
|
||
if (argc == 4)
|
||
for (tl = from; by < 0 ? to <= tl : tl <= to; tl = tl1)
|
||
{
|
||
lt = localtime_r (&tl, &tml);
|
||
if (lt)
|
||
{
|
||
tmk = tml;
|
||
tk = mktime (&tmk);
|
||
status |= check_result (tk, tmk, tl, &tml);
|
||
}
|
||
else
|
||
{
|
||
printf ("localtime_r (%ld) yields 0\n", (long int) tl);
|
||
status = 1;
|
||
}
|
||
tl1 = tl + by;
|
||
if ((tl1 < tl) != (by < 0))
|
||
break;
|
||
}
|
||
else
|
||
for (tl = from; by < 0 ? to <= tl : tl <= to; tl = tl1)
|
||
{
|
||
/* Null benchmark. */
|
||
lt = localtime_r (&tl, &tml);
|
||
if (lt)
|
||
{
|
||
tmk = tml;
|
||
tk = tl;
|
||
status |= check_result (tk, tmk, tl, &tml);
|
||
}
|
||
else
|
||
{
|
||
printf ("localtime_r (%ld) yields 0\n", (long int) tl);
|
||
status = 1;
|
||
}
|
||
tl1 = tl + by;
|
||
if ((tl1 < tl) != (by < 0))
|
||
break;
|
||
}
|
||
}
|
||
else
|
||
printf ("Usage:\
|
||
\t%s YYYY-MM-DD HH:MM:SS [ISDST] # Test given time.\n\
|
||
\t%s FROM BY TO # Test values FROM, FROM+BY, ..., TO.\n\
|
||
\t%s FROM BY TO - # Do not test those values (for benchmark).\n",
|
||
argv[0], argv[0], argv[0]);
|
||
|
||
return status;
|
||
}
|
||
|
||
#endif /* DEBUG_MKTIME */
|
||
|
||
/*
|
||
Local Variables:
|
||
compile-command: "gcc -DDEBUG_MKTIME -I. -Wall -W -O2 -g mktime.c -o mktime"
|
||
End:
|
||
*/
|