* mktime.c: Remove; moving to ../lib.

2 files changed, 2 insertions, 544 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 52eb207466..badd1955c5 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,7 @@
 2011-01-09  Paul Eggert  <[email protected]>
 
+	* mktime.c: Remove; moving to ../lib.
+
 	Use gnulib's mktime module.
 	* deps.mk (mktime.o): Remove rule.
 
diff --git a/src/mktime.c b/src/mktime.c
deleted file mode 100644
index ede151981f..0000000000
--- a/src/mktime.c
+++ /dev/null
@@ -1,544 +0,0 @@
-/* Convert a `struct tm' to a time_t value.
-   Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003,
-                 2004, 2005, 2006, 2007  Free Software Foundation, Inc.
-   Contributed by Paul Eggert ([email protected]).
-
-   NOTE: The canonical source of this file is maintained with the GNU C Library.
-   Bugs can be reported to [email protected].
-
-   This program is free software; you can redistribute it and/or modify it
-   under the terms of the GNU General Public License as published by the
-   Free Software Foundation; either version 2, or (at your option) any
-   later version.
-
-   This program 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 General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
-   USA.  */
-
-/* Define this to have a standalone program to test this implementation of
-   mktime.  */
-/* #define DEBUG 1 */
-
-#ifdef HAVE_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>
-# endif
-/* Make it work even if the system's libc has its own mktime routine.  */
-# define mktime my_mktime
-#endif /* DEBUG */
-
-#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)	\
-  ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
-#endif
-
-/* How many days come before each month (0-12).  */
-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 }
-  };
-
-
-#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)
-{
-  struct tm *l = localtime (t);
-  if (! l)
-    return 0;
-  *tp = *l;
-  return tp;
-}
-#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
-ydhms_tm_diff (int year, int yday, int hour, int min, int sec, const struct tm *tp)
-{
-  if (!tp)
-    return 1;
-  else
-    {
-      /* 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));
-    }
-}
-
-/* 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;
-
-  if (! (r = (*convert) (t, tp)) && *t)
-    {
-      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;
-	}
-    }
-
-  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.  */
-time_t
-__mktime_internal (struct tm *tp, struct tm *(*convert) (const time_t *, struct tm *),
-		   time_t *offset)
-{
-  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
-
-  /* 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;
-	    }
-	}
-    }
-
-  *offset = t - t0;
-
-#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
-
-  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.  ([email protected]) */
-
-      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;
-    }
-
-  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;
-    }
-
-  *tp = tm;
-  return t;
-}
-
-
-static time_t localtime_offset;
-
-/* 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 __mktime_internal (tp, my_mktime_localtime_r, &localtime_offset);
-}
-
-#ifdef weak_alias
-weak_alias (mktime, timelocal)
-#endif
-
-#if DEBUG
-
-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));
-}
-
-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");
-}
-
-static int
-check_result (tk, tmk, tl, lt)
-     time_t tk;
-     struct tm tmk;
-     time_t tl;
-     struct tm *lt;
-{
-  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;
-}
-
-int
-main (argc, argv)
-     int argc;
-     char **argv;
-{
-  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))
-    {
-      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)
-	{
-	  tml = *lt;
-	  lt = &tml;
-	}
-      printf ("mktime returns %ld == ", (long) 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; 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 */
-
-/*
-Local Variables:
-compile-command: "gcc -DDEBUG -DHAVE_LIMITS_H -DSTDC_HEADERS -Wall -W -O -g mktime.c -o mktime"
-End:
-*/
-