-/* Copyright (C) 1993, 1994 Free Software Foundation, Inc.
- Contributed by Noel Cragg (noel@cs.oberlin.edu), with fixes by
- Michael E. Calwas (calwas@ttd.teradyne.com) and
- Wade Hampton (tasi029@tmn.com).
-
-This file is part of the GNU C Library.
-
-The GNU C Library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public License as
-published by the Free Software Foundation; either version 2 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
-Library General Public License for more details.
-
-You should have received a copy of the GNU Library General Public
-License along with the GNU C Library; see the file COPYING.LIB. If
-not, write to the Free Software Foundation, Inc., 675 Mass Ave,
-Cambridge, MA 02139, USA. */
+/* Convert a `struct tm' to a time_t value.
+ Copyright (C) 1993-1999, 2002 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
/* Define this to have a standalone program to test this implementation of
mktime. */
-/* #define DEBUG */
+/* #define DEBUG 1 */
#ifdef HAVE_CONFIG_H
-#if defined (CONFIG_BROKETS)
-/* We use <config.h> instead of "config.h" so that a compilation
- using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
- (which it would do because it found this file in $srcdir). */
-#include <config.h>
-#else
-#include "config.h"
+# include <config.h>
#endif
+
+#ifdef _LIBC
+# define HAVE_LIMITS_H 1
+# define STDC_HEADERS 1
+#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 <sys/types.h> /* Some systems define `time_t' here. */
#include <time.h>
+#if HAVE_LIMITS_H
+# include <limits.h>
+#endif
+
+#if DEBUG
+# include <stdio.h>
+# if STDC_HEADERS
+# include <stdlib.h>
+# include <string.h>
+# endif
+/* Make it work even if the system's libc has its own mktime routine. */
+# define mktime my_mktime
+#endif /* DEBUG */
+
+#ifndef __P
+# if defined __GNUC__ || (defined __STDC__ && __STDC__)
+# define __P(args) args
+# else
+# define __P(args) ()
+# endif /* GCC. */
+#endif /* Not __P. */
+
+#ifndef CHAR_BIT
+# define CHAR_BIT 8
+#endif
+
+/* The extra casts work around common compiler bugs. */
+#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
+/* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
+ It is necessary at least when t == time_t. */
+#define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
+ ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
+#define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
+
+#ifndef INT_MIN
+# define INT_MIN TYPE_MINIMUM (int)
+#endif
+#ifndef INT_MAX
+# define INT_MAX TYPE_MAXIMUM (int)
+#endif
+
+#ifndef TIME_T_MIN
+# define TIME_T_MIN TYPE_MINIMUM (time_t)
+#endif
+#ifndef TIME_T_MAX
+# define TIME_T_MAX TYPE_MAXIMUM (time_t)
+#endif
+
+#define TM_YEAR_BASE 1900
+#define EPOCH_YEAR 1970
#ifndef __isleap
/* Nonzero if YEAR is a leap year (every 4 years,
except every 100th isn't, and every 400th is). */
-#define __isleap(year) \
+# define __isleap(year) \
((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
#endif
-#ifndef __P
-#if defined (__GNUC__) || (defined (__STDC__) && __STDC__)
-#define __P(args) args
-#else
-#define __P(args) ()
-#endif /* GCC. */
-#endif /* Not __P. */
-
-/* How many days are in each month. */
-const unsigned short int __mon_lengths[2][12] =
+/* How many days come before each month (0-12). */
+#ifndef _LIBC
+static
+#endif
+const unsigned short int __mon_yday[2][13] =
{
/* Normal years. */
- { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
+ { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
/* Leap years. */
- { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
+ { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
};
-static int times_through_search; /* This library routine should never
- hang -- make sure we always return
- when we're searching for a value */
-
-
-#ifdef DEBUG
-
-#include <stdio.h>
-#include <ctype.h>
-
-int debugging_enabled = 0;
-
-/* Print the values in a `struct tm'. */
-static void
-printtm (it)
- struct tm *it;
+#ifdef _LIBC
+# define my_mktime_localtime_r __localtime_r
+#else
+/* If we're a mktime substitute in a GNU program, then prefer
+ localtime to localtime_r, since many localtime_r implementations
+ are buggy. */
+static struct tm *
+my_mktime_localtime_r (const time_t *t, struct tm *tp)
{
- printf ("%02d/%02d/%04d %02d:%02d:%02d (%s) yday:%03d dst:%d gmtoffset:%ld",
- it->tm_mon + 1,
- it->tm_mday,
- it->tm_year + 1900,
- it->tm_hour,
- it->tm_min,
- it->tm_sec,
- it->tm_zone,
- it->tm_yday,
- it->tm_isdst,
- it->tm_gmtoff);
+ struct tm *l = localtime (t);
+ if (! l)
+ return 0;
+ *tp = *l;
+ return tp;
}
-#endif
+#endif /* ! _LIBC */
+/* Yield the difference between (YEAR-YDAY HOUR:MIN:SEC) and (*TP),
+ measured in seconds, ignoring leap seconds.
+ YEAR uses the same numbering as TM->tm_year.
+ All values are in range, except possibly YEAR.
+ If TP is null, return a nonzero value.
+ If overflow occurs, yield the low order bits of the correct answer. */
static time_t
-dist_tm (t1, t2)
- struct tm *t1;
- struct tm *t2;
+ydhms_tm_diff (int year, int yday, int hour, int min, int sec,
+ const struct tm *tp)
{
- time_t distance = 0;
- unsigned long int v1, v2;
- int diff_flag = 0;
-
- v1 = v2 = 0;
-
-#define doit(x, secs) \
- v1 += t1->x * secs; \
- v2 += t2->x * secs; \
- if (!diff_flag) \
- { \
- if (t1->x < t2->x) \
- diff_flag = -1; \
- else if (t1->x > t2->x) \
- diff_flag = 1; \
- }
-
- doit (tm_year, 31536000); /* Okay, not all years have 365 days. */
- doit (tm_mon, 2592000); /* Okay, not all months have 30 days. */
- doit (tm_mday, 86400);
- doit (tm_hour, 3600);
- doit (tm_min, 60);
- doit (tm_sec, 1);
-
-#undef doit
-
- /* We should also make sure that the sign of DISTANCE is correct -- if
- DIFF_FLAG is positive, the distance should be positive and vice versa. */
-
- distance = (v1 > v2) ? (v1 - v2) : (v2 - v1);
- if (diff_flag < 0)
- distance = -distance;
-
- if (times_through_search > 20) /* Arbitrary # of calls, but makes sure we
- never hang if there's a problem with
- this algorithm. */
+ if (!tp)
+ return 1;
+ else
{
- distance = diff_flag;
+ /* Compute intervening leap days correctly even if year is negative.
+ Take care to avoid int overflow. time_t overflow is OK, since
+ only the low order bits of the correct time_t answer are needed.
+ Don't convert to time_t until after all divisions are done, since
+ time_t might be unsigned. */
+ int a4 = (year >> 2) + (TM_YEAR_BASE >> 2) - ! (year & 3);
+ int b4 = (tp->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (tp->tm_year & 3);
+ int a100 = a4 / 25 - (a4 % 25 < 0);
+ int b100 = b4 / 25 - (b4 % 25 < 0);
+ int a400 = a100 >> 2;
+ int b400 = b100 >> 2;
+ int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
+ time_t years = year - (time_t) tp->tm_year;
+ time_t days = (365 * years + intervening_leap_days
+ + (yday - tp->tm_yday));
+ return (60 * (60 * (24 * days + (hour - tp->tm_hour))
+ + (min - tp->tm_min))
+ + (sec - tp->tm_sec));
}
-
- /* We need this DIFF_FLAG business because it is forseeable that the
- distance may be zero when, in actuality, the two structures are
- different. This is usually the case when the dates are 366 days apart
- and one of the years is a leap year. */
-
- if (distance == 0 && diff_flag)
- distance = 86400 * diff_flag;
-
- return distance;
}
-
-
-/* MKTIME converts the values in a struct tm to a time_t. The values
- in tm_wday and tm_yday are ignored; other values can be put outside
- of legal ranges since they will be normalized. This routine takes
- care of that normalization. */
-void
-do_normalization (tmptr)
- struct tm *tmptr;
+/* 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. */
+static struct tm *
+ranged_convert (struct tm *(*convert) (const time_t *, struct tm *),
+ time_t *t, struct tm *tp)
{
+ struct tm *r;
-#define normalize(foo,x,y,bar); \
- while (tmptr->foo < x) \
- { \
- tmptr->bar--; \
- tmptr->foo = (y - (x - tmptr->foo) + 1); \
- } \
- while (tmptr->foo > y) \
- { \
- tmptr->foo = (x + (tmptr->foo - y) - 1); \
- tmptr->bar++; \
- }
-
- normalize (tm_sec, 0, 59, tm_min);
- normalize (tm_min, 0, 59, tm_hour);
- normalize (tm_hour, 0, 23, tm_mday);
-
- /* Do the month first, so day range can be found. */
- normalize (tm_mon, 0, 11, tm_year);
-
- /* Since the day range modifies the month, we should be careful how
- we reference the array of month lengths -- it is possible that
- the month will go negative, hence the modulo...
-
- Also, tm_year is the year - 1900, so we have to 1900 to have it
- work correctly. */
-
- normalize (tm_mday, 1,
- __mon_lengths[__isleap (tmptr->tm_year + 1900)]
- [((tmptr->tm_mon < 0)
- ? (12 + (tmptr->tm_mon % 12))
- : (tmptr->tm_mon % 12)) ],
- tm_mon);
-
- /* Do the month again, because the day may have pushed it out of range. */
- normalize (tm_mon, 0, 11, tm_year);
-
- /* Do the day again, because the month may have changed the range. */
- normalize (tm_mday, 1,
- __mon_lengths[__isleap (tmptr->tm_year + 1900)]
- [((tmptr->tm_mon < 0)
- ? (12 + (tmptr->tm_mon % 12))
- : (tmptr->tm_mon % 12)) ],
- tm_mon);
-
-#ifdef DEBUG
- if (debugging_enabled)
+ if (! (r = (*convert) (t, tp)) && *t)
{
- printf (" After normalizing:\n ");
- printtm (tmptr);
- putchar ('\n');
+ time_t bad = *t;
+ time_t ok = 0;
+ struct tm tm;
+
+ /* BAD is a known unconvertible time_t, and OK is a known good one.
+ Use binary search to narrow the range between BAD and OK until
+ they differ by 1. */
+ while (bad != ok + (bad < 0 ? -1 : 1))
+ {
+ time_t mid = *t = (bad < 0
+ ? bad + ((ok - bad) >> 1)
+ : ok + ((bad - ok) >> 1));
+ if ((r = (*convert) (t, tp)))
+ {
+ tm = *r;
+ ok = mid;
+ }
+ else
+ bad = mid;
+ }
+
+ if (!r && ok)
+ {
+ /* The last conversion attempt failed;
+ revert to the most recent successful attempt. */
+ *t = ok;
+ *tp = tm;
+ r = tp;
+ }
}
-#endif
+ return r;
}
-/* Here's where the work gets done. */
-
-#define BAD_STRUCT_TM ((time_t) -1)
-
+/* 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. */
+#ifndef _LIBC
+static
+#endif
time_t
-_mktime_internal (timeptr, producer)
- struct tm *timeptr;
- struct tm *(*producer) __P ((const time_t *));
+__mktime_internal (struct tm *tp,
+ struct tm *(*convert) (const time_t *, struct tm *),
+ time_t *offset)
{
- struct tm our_tm; /* our working space */
- struct tm *me = &our_tm; /* a pointer to the above */
- time_t result; /* the value we return */
-
- *me = *timeptr; /* copy the struct tm that was passed
- in by the caller */
-
-
- /***************************/
- /* Normalize the structure */
- /***************************/
-
- /* This routine assumes that the value of TM_ISDST is -1, 0, or 1.
- If the user didn't pass it in that way, fix it. */
-
- if (me->tm_isdst > 0)
- me->tm_isdst = 1;
- else if (me->tm_isdst < 0)
- me->tm_isdst = -1;
+ time_t t, dt, t0, t1, t2;
+ 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;
+ int year = year_requested + mon_years;
+
+ /* The other values need not be in range:
+ the remaining code handles minor overflows correctly,
+ assuming int and time_t arithmetic wraps around.
+ Major overflows are caught at the end. */
+
+ /* Calculate day of year from year, month, and day of month.
+ The result need not be in range. */
+ int yday = ((__mon_yday[__isleap (year + TM_YEAR_BASE)]
+ [mon_remainder + 12 * negative_mon_remainder])
+ + mday - 1);
+
+ int sec_requested = sec;
+
+ /* Only years after 1970 are defined.
+ If year is 69, it might still be representable due to
+ timezone differences. */
+ if (year < 69)
+ return -1;
+
+#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;
+#endif
- do_normalization (me);
+ /* Invert CONVERT by probing. First assume the same offset as last time.
+ Then repeatedly use the error to improve the guess. */
+
+ tm.tm_year = EPOCH_YEAR - TM_YEAR_BASE;
+ tm.tm_yday = tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
+ t0 = ydhms_tm_diff (year, yday, hour, min, sec, &tm);
+
+ for (t = t1 = t2 = t0 + *offset, dst2 = 0;
+ (dt = ydhms_tm_diff (year, yday, hour, min, sec,
+ ranged_convert (convert, &t, &tm)));
+ t1 = t2, t2 = t, t += dt, 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 DT. Follow the common
+ practice in this case, which is to return a time that is DT
+ 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. */
+ break;
+ else if (--remaining_probes == 0)
+ return -1;
+
+ /* If we have a match, check whether tm.tm_isdst has the requested
+ value, if any. */
+ if (dt == 0 && isdst != tm.tm_isdst && 0 <= isdst && 0 <= 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 previous three calendar quarters (approximately),
+ looking for the desired isdst. This isn't perfect,
+ but it's good enough in practice. */
+ int quarter = 7889238; /* seconds per average 1/4 Gregorian year */
+ int i;
+
+ /* If we're too close to the time_t limit, look in future quarters. */
+ if (t < TIME_T_MIN + 3 * quarter)
+ quarter = -quarter;
+
+ for (i = 1; i <= 3; i++)
+ {
+ time_t ot = t - i * quarter;
+ struct tm otm;
+ ranged_convert (convert, &ot, &otm);
+ if (otm.tm_isdst == isdst)
+ {
+ /* We found the desired tm_isdst.
+ Extrapolate back to the desired time. */
+ t = ot + ydhms_tm_diff (year, yday, hour, min, sec, &otm);
+ ranged_convert (convert, &t, &tm);
+ break;
+ }
+ }
+ }
- /* Get out of here if it's not possible to represent this struct.
- If any of the values in the normalized struct tm are negative,
- our algorithms won't work. Luckily, we only need to check the
- year at this point; normalization guarantees that all values will
- be in correct ranges EXCEPT the year. */
+ *offset = t - t0;
- if (me->tm_year < 0)
- return BAD_STRUCT_TM;
+#if LEAP_SECONDS_POSSIBLE
+ if (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. */
+ t += sec_requested - sec + (sec == 0 && tm.tm_sec == 60);
+ if (! (*convert) (&t, &tm))
+ return -1;
+ }
+#endif
- /*************************************************/
- /* Find the appropriate time_t for the structure */
- /*************************************************/
+ if (TIME_T_MAX / INT_MAX / 366 / 24 / 60 / 60 < 3)
+ {
+ /* time_t isn't large enough to rule out overflows in ydhms_tm_diff,
+ so check for major overflows. A gross check suffices,
+ since if t has overflowed, it is off by a multiple of
+ TIME_T_MAX - TIME_T_MIN + 1. So ignore any component of
+ the difference that is bounded by a small value. */
+
+ double dyear = (double) year_requested + mon_years - tm.tm_year;
+ double dday = 366 * dyear + mday;
+ double dsec = 60 * (60 * (24 * dday + hour) + min) + sec_requested;
+
+ /* On Irix4.0.5 cc, dividing TIME_T_MIN by 3 does not produce
+ correct results, ie., it erroneously gives a positive value
+ of 715827882. Setting a variable first then doing math on it
+ seems to work. (ghazi@caip.rutgers.edu) */
+
+ const time_t time_t_max = TIME_T_MAX;
+ const time_t time_t_min = TIME_T_MIN;
+
+ if (time_t_max / 3 - time_t_min / 3 < (dsec < 0 ? - dsec : dsec))
+ return -1;
+ }
- /* Modified b-search -- make intelligent guesses as to where the
- time might lie along the timeline, assuming that our target time
- lies a linear distance (w/o considering time jumps of a
- particular region).
+ if (year == 69)
+ {
+ /* If year was 69, need to check whether the time was representable
+ or not. */
+ if (t < 0 || t > 2 * 24 * 60 * 60)
+ return -1;
+ }
- Assume that time does not fluctuate at all along the timeline --
- e.g., assume that a day will always take 86400 seconds, etc. --
- and come up with a hypothetical value for the time_t
- representation of the struct tm TARGET, in relation to the guess
- variable -- it should be pretty close!
+ *tp = tm;
+ return t;
+}
- After testing this, the maximum number of iterations that I had
- on any number that I tried was 3! Not bad.
- The reason this is not a subroutine is that we will modify some
- fields in the struct tm (yday and mday). I've never felt good
- about side-effects when writing structured code... */
+static time_t localtime_offset;
- {
- struct tm *guess_tm;
- time_t guess = 0;
- time_t distance = 0;
- time_t last_distance = 0;
-
- times_through_search = 0;
-
- do
- {
- guess += distance;
-
- times_through_search++;
-
- guess_tm = (*producer) (&guess);
-
-#ifdef DEBUG
- if (debugging_enabled)
- {
- printf (" Guessing time_t == %d\n ", (int) guess);
- printtm (guess_tm);
- putchar ('\n');
- }
-#endif
-
- /* How far is our guess from the desired struct tm? */
- distance = dist_tm (me, guess_tm);
-
- /* Handle periods of time where a period of time is skipped.
- For example, 2:15 3 April 1994 does not exist, because DST
- is in effect. The distance function will alternately
- return values of 3600 and -3600, because it doesn't know
- that the requested time doesn't exist. In these situations
- (even if the skip is not exactly an hour) the distances
- returned will be the same, but alternating in sign. We
- want the later time, so check to see that the distance is
- oscillating and we've chosen the correct of the two
- possibilities.
-
- Useful: 3 Apr 94 765356300, 30 Oct 94 783496000 */
-
- if ((distance == -last_distance) && (distance < last_distance))
- {
- /* If the caller specified that the DST flag was off, it's
- not possible to represent this time. */
- if (me->tm_isdst == 0)
- {
-#ifdef DEBUG
- printf (" Distance is oscillating -- dst flag nixes struct!\n");
+/* Convert *TP to a time_t value. */
+time_t
+mktime (tp)
+ struct tm *tp;
+{
+#ifdef _LIBC
+ /* 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 ();
#endif
- return BAD_STRUCT_TM;
- }
-#ifdef DEBUG
- printf (" Distance is oscillating -- chose the later time.\n");
-#endif
- distance = 0;
- }
+ return __mktime_internal (tp, my_mktime_localtime_r, &localtime_offset);
+}
- if ((distance == 0) && (me->tm_isdst != -1)
- && (me->tm_isdst != guess_tm->tm_isdst))
- {
- /* If we're in this code, we've got the right time but the
- wrong daylight savings flag. We need to move away from
- the time that we have and approach the other time from
- the other direction. That is, if I've requested the
- non-DST version of a time and I get the DST version
- instead, I want to put us forward in time and search
- backwards to get the other time. I checked all of the
- configuration files for the tz package -- no entry
- saves more than two hours, so I think we'll be safe by
- moving 24 hours in one direction. IF THE AMOUNT OF
- TIME SAVED IN THE CONFIGURATION FILES CHANGES, THIS
- VALUE MAY NEED TO BE ADJUSTED. Luckily, we can never
- have more than one level of overlaps, or this would
- never work. */
-
-#define SKIP_VALUE 86400
-
- if (guess_tm->tm_isdst == 0)
- /* we got the later one, but want the earlier one */
- distance = -SKIP_VALUE;
- else
- distance = SKIP_VALUE;
-
-#ifdef DEBUG
- printf (" Got the right time, wrong DST value -- adjusting\n");
+#ifdef weak_alias
+weak_alias (mktime, timelocal)
#endif
- }
-
- last_distance = distance;
-
- } while (distance != 0);
- /* Check to see that the dst flag matches */
-
- if (me->tm_isdst != -1)
- {
- if (me->tm_isdst != guess_tm->tm_isdst)
- {
-#ifdef DEBUG
- printf (" DST flag doesn't match! FIXME?\n");
+#ifdef _LIBC
+libc_hidden_def (mktime)
+libc_hidden_weak (timelocal)
#endif
- return BAD_STRUCT_TM;
- }
- }
-
- result = guess; /* Success! */
-
- /* On successful completion, the values of tm_wday and tm_yday
- have to be set appropriately. */
-
- /* me->tm_yday = guess_tm->tm_yday;
- me->tm_mday = guess_tm->tm_mday; */
-
- *me = *guess_tm;
- }
-
- /* Update the caller's version of the structure */
+\f
+#if DEBUG
- *timeptr = *me;
+static int
+not_equal_tm (a, b)
+ struct tm *a;
+ 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_mday ^ b->tm_mday)
+ | (a->tm_yday ^ b->tm_yday)
+ | (a->tm_isdst ^ b->tm_isdst));
+}
- return result;
+static void
+print_tm (tp)
+ 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");
}
-time_t
-#ifdef DEBUG /* make it work even if the system's
- libc has it's own mktime routine */
-my_mktime (timeptr)
-#else
-mktime (timeptr)
-#endif
- struct tm *timeptr;
+static int
+check_result (tk, tmk, tl, lt)
+ time_t tk;
+ struct tm tmk;
+ time_t tl;
+ struct tm *lt;
{
- return _mktime_internal (timeptr, localtime);
+ if (tk != tl || !lt || not_equal_tm (&tmk, lt))
+ {
+ printf ("mktime (");
+ print_tm (&tmk);
+ printf (")\nyields (");
+ print_tm (lt);
+ printf (") == %ld, should be %ld\n", (long) tl, (long) tk);
+ return 1;
+ }
+
+ return 0;
}
-\f
-#ifdef DEBUG
-void
+
+int
main (argc, argv)
int argc;
- char *argv[];
+ char **argv;
{
- int time;
- int result_time;
- struct tm *tmptr;
-
- if (argc == 1)
+ int status = 0;
+ struct tm tm, tmk, tml;
+ struct tm *lt;
+ time_t tk, tl;
+ char trailer;
+
+ 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))
{
- long q;
-
- printf ("starting long test...\n");
-
- for (q = 10000000; q < 1000000000; q += 599)
+ 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 (&tl);
+ if (lt)
{
- struct tm *tm = localtime ((time_t *) &q);
- if ((q % 10000) == 0) { printf ("%ld\n", q); fflush (stdout); }
- if (q != my_mktime (tm))
- { printf ("failed for %ld\n", q); fflush (stdout); }
+ tml = *lt;
+ lt = &tml;
}
-
- printf ("test finished\n");
-
- exit (0);
+ printf ("mktime returns %ld == ", (long) tl);
+ print_tm (&tmk);
+ printf ("\n");
+ status = check_result (tl, tmk, tl, lt);
}
-
- if (argc != 2)
+ else if (argc == 4 || (argc == 5 && strcmp (argv[4], "-") == 0))
{
- printf ("wrong # of args\n");
- exit (0);
- }
-
- debugging_enabled = 1; /* We want to see the info */
-
- ++argv;
- time = atoi (*argv);
-
- tmptr = localtime ((time_t *) &time);
- printf ("Localtime tells us that a time_t of %d represents\n ", time);
- printtm (tmptr);
- putchar ('\n');
-
- printf (" Given localtime's return val, mktime returns %d which is\n ",
- (int) my_mktime (tmptr));
- printtm (tmptr);
- putchar ('\n');
-
-#if 0
- tmptr->tm_sec -= 20;
- tmptr->tm_min -= 20;
- tmptr->tm_hour -= 20;
- tmptr->tm_mday -= 20;
- tmptr->tm_mon -= 20;
- tmptr->tm_year -= 20;
- tmptr->tm_gmtoff -= 20000; /* This has no effect! */
- tmptr->tm_zone = NULL; /* Nor does this! */
- tmptr->tm_isdst = -1;
-#endif
-
- tmptr->tm_hour += 1;
- tmptr->tm_isdst = -1;
-
- printf ("\n\nchanged ranges: ");
- printtm (tmptr);
- putchar ('\n');
+ time_t from = atol (argv[1]);
+ time_t by = atol (argv[2]);
+ time_t to = atol (argv[3]);
- result_time = my_mktime (tmptr);
- printf ("\nmktime: %d\n", result_time);
-
- tmptr->tm_isdst = 0;
-
- printf ("\n\nchanged ranges: ");
- printtm (tmptr);
- putchar ('\n');
-
- result_time = my_mktime (tmptr);
- printf ("\nmktime: %d\n", result_time);
+ if (argc == 4)
+ for (tl = from; tl <= to; tl += by)
+ {
+ lt = localtime (&tl);
+ if (lt)
+ {
+ tmk = tml = *lt;
+ tk = mktime (&tmk);
+ status |= check_result (tk, tmk, tl, tml);
+ }
+ else
+ {
+ printf ("localtime (%ld) yields 0\n", (long) tl);
+ status = 1;
+ }
+ }
+ else
+ for (tl = from; tl <= to; tl += by)
+ {
+ /* Null benchmark. */
+ lt = localtime (&tl);
+ if (lt)
+ {
+ tmk = tml = *lt;
+ tk = tl;
+ status |= check_result (tk, tmk, tl, tml);
+ }
+ else
+ {
+ printf ("localtime (%ld) yields 0\n", (long) tl);
+ status = 1;
+ }
+ }
+ }
+ 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 */
+#endif /* DEBUG */
\f
/*
Local Variables:
-compile-command: "gcc -g mktime.c -o mktime -DDEBUG"
+compile-command: "gcc -DDEBUG -DHAVE_LIMITS_H -DSTDC_HEADERS -Wall -W -O -g mktime.c -o mktime"
End:
*/
projects / gnulib.git / blobdiff