#include "asterisk.h" ASTERISK_FILE_VERSION(__FILE__, "$Revision$") to these files. git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@14714 65c4cc65-6c06-0410-ace0-fbb531ad65f3
1511 lines
38 KiB
C
1511 lines
38 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* Most of this code is in the public domain, so clarified as of
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* June 5, 1996 by Arthur David Olson (arthur_david_olson@nih.gov).
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*
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* All modifications to this code to abstract timezones away from
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* the environment are by Tilghman Lesher, <tlesher@vcch.com>, with
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* the copyright assigned to Digium.
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* Multi-timezone Localtime code
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*
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* \author Leap second handling Bradley White (bww@k.gp.cs.cmu.edu).
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* \author POSIX-style TZ environment variable handling from Guy Harris (guy@auspex.com).
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*
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*/
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/*
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* Asterisk defines
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*
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* Don't mess with these unless you're really sure you know what you're doing.
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*/
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#ifndef _THREAD_SAFE
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#define _THREAD_SAFE
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#endif
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#define TZ_STRLEN_MAX 255
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/* #define DEBUG */
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/*LINTLIBRARY*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#ifdef DEBUG
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#include <stdio.h>
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#endif
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "private.h"
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#include "tzfile.h"
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#include "asterisk/lock.h"
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#include "asterisk/localtime.h"
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#ifndef lint
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#ifndef NOID
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static const char elsieid[] = "@(#)localtime.c 7.57";
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#endif /* !defined NOID */
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#endif /* !defined lint */
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/*
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** SunOS 4.1.1 headers lack O_BINARY.
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*/
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#ifdef O_BINARY
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#define OPEN_MODE (O_RDONLY | O_BINARY)
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#endif /* defined O_BINARY */
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#ifndef O_BINARY
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#define OPEN_MODE O_RDONLY
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#endif /* !defined O_BINARY */
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#ifdef SOLARIS
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#undef TM_ZONE
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#undef TM_GMTOFF
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#endif
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#ifdef TM_ZONE
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#ifndef WILDABBR
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/*! \note
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* Someone might make incorrect use of a time zone abbreviation:
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* 1. They might reference tzname[0] before calling ast_tzset (explicitly
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* or implicitly).
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* 2. They might reference tzname[1] before calling ast_tzset (explicitly
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* or implicitly).
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* 3. They might reference tzname[1] after setting to a time zone
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* in which Daylight Saving Time is never observed.
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* 4. They might reference tzname[0] after setting to a time zone
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* in which Standard Time is never observed.
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* 5. They might reference tm.TM_ZONE after calling offtime.
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* What's best to do in the above cases is open to debate;
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* for now, we just set things up so that in any of the five cases
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* WILDABBR is used. Another possibility: initialize tzname[0] to the
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* string "tzname[0] used before set", and similarly for the other cases.
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* And another: initialize tzname[0] to "ERA", with an explanation in the
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* manual page of what this "time zone abbreviation" means (doing this so
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* that tzname[0] has the "normal" length of three characters).
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*/
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#define WILDABBR " "
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#endif /* !defined WILDABBR */
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static char wildabbr[] = "WILDABBR";
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#endif /* TM_ZONE */
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/*! \brief FreeBSD defines 'zone' in 'struct tm' as non-const, so don't declare this
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string as const. */
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static char gmt[] = "GMT";
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/*!< \brief time type information */
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struct ttinfo {
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long tt_gmtoff; /*!< GMT offset in seconds */
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int tt_isdst; /*!< used to set tm_isdst */
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int tt_abbrind; /*!< abbreviation list index */
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int tt_ttisstd; /*!< TRUE if transition is std time */
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int tt_ttisgmt; /*!< TRUE if transition is GMT */
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};
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/*! \brief leap second information */
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struct lsinfo {
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time_t ls_trans; /*!< transition time */
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long ls_corr; /*!< correction to apply */
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};
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#define BIGGEST(a, b) (((a) > (b)) ? (a) : (b))
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#ifdef TZNAME_MAX
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#define MY_TZNAME_MAX TZNAME_MAX
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#endif /* defined TZNAME_MAX */
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#ifndef TZNAME_MAX
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#define MY_TZNAME_MAX 255
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#endif /* !defined TZNAME_MAX */
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struct state {
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char name[TZ_STRLEN_MAX + 1];
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int leapcnt;
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int timecnt;
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int typecnt;
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int charcnt;
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time_t ats[TZ_MAX_TIMES];
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unsigned char types[TZ_MAX_TIMES];
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struct ttinfo ttis[TZ_MAX_TYPES];
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char chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof gmt),
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(2 * (MY_TZNAME_MAX + 1)))];
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struct lsinfo lsis[TZ_MAX_LEAPS];
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struct state *next;
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};
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struct rule {
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int r_type; /*!< type of rule--see below */
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int r_day; /*!< day number of rule */
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int r_week; /*!< week number of rule */
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int r_mon; /*!< month number of rule */
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long r_time; /*!< transition time of rule */
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};
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#define JULIAN_DAY 0 /*!< Jn - Julian day */
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#define DAY_OF_YEAR 1 /*!< n - day of year */
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#define MONTH_NTH_DAY_OF_WEEK 2 /*!< Mm.n.d - month, week, day of week */
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/*
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** Prototypes for static functions.
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*/
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static long detzcode P((const char * codep));
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static const char * getnum P((const char * strp, int * nump, int min,
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int max));
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static const char * getsecs P((const char * strp, long * secsp));
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static const char * getoffset P((const char * strp, long * offsetp));
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static const char * getrule P((const char * strp, struct rule * rulep));
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static void gmtload P((struct state * sp));
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static void gmtsub P((const time_t * timep, long offset,
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struct tm * tmp, const char * zone));
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static void localsub P((const time_t * timep, long offset,
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struct tm * tmp, const char * zone));
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static int increment_overflow P((int * number, int delta));
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static int normalize_overflow P((int * tensptr, int * unitsptr,
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int base));
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static time_t time1 P((struct tm * tmp,
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void(*funcp) P((const time_t *,
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long, struct tm *, const char*)),
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long offset, const char * zone));
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static time_t time2 P((struct tm *tmp,
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void(*funcp) P((const time_t *,
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long, struct tm*, const char*)),
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long offset, int * okayp, const char * zone));
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static void timesub P((const time_t * timep, long offset,
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const struct state * sp, struct tm * tmp));
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static int tmcomp P((const struct tm * atmp,
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const struct tm * btmp));
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static time_t transtime P((time_t janfirst, int year,
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const struct rule * rulep, long offset));
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static int tzload P((const char * name, struct state * sp));
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static int tzparse P((const char * name, struct state * sp,
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int lastditch));
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static struct state * lclptr = NULL;
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static struct state * last_lclptr = NULL;
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static struct state * gmtptr = NULL;
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#ifndef TZ_STRLEN_MAX
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#define TZ_STRLEN_MAX 255
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#endif /* !defined TZ_STRLEN_MAX */
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static int gmt_is_set;
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#ifdef _THREAD_SAFE
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AST_MUTEX_DEFINE_STATIC(lcl_mutex);
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AST_MUTEX_DEFINE_STATIC(tzset_mutex);
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AST_MUTEX_DEFINE_STATIC(tzsetwall_mutex);
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AST_MUTEX_DEFINE_STATIC(gmt_mutex);
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#endif
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/*
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** Section 4.12.3 of X3.159-1989 requires that
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** Except for the strftime function, these functions [asctime,
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** ctime, gmtime, localtime] return values in one of two static
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** objects: a broken-down time structure and an array of char.
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** Thanks to Paul Eggert (eggert@twinsun.com) for noting this.
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*/
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static long detzcode(const char * const codep)
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{
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register long result;
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register int i;
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result = (codep[0] & 0x80) ? ~0L : 0L;
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for (i = 0; i < 4; ++i)
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result = (result << 8) | (codep[i] & 0xff);
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return result;
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}
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static int tzload(register const char *name, register struct state *const sp)
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{
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register const char * p;
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register int i;
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register int fid;
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#ifdef DEBUG
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fprintf(stderr,"tzload called with name=%s, sp=%d\n", name, sp);
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#endif
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if (name == NULL && (name = TZDEFAULT) == NULL)
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return -1;
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{
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register int doaccess;
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struct stat stab;
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/*
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** Section 4.9.1 of the C standard says that
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** "FILENAME_MAX expands to an integral constant expression
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** that is the size needed for an array of char large enough
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** to hold the longest file name string that the implementation
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** guarantees can be opened."
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*/
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char fullname[FILENAME_MAX + 1] = "";
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if (name[0] == ':')
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++name;
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doaccess = name[0] == '/';
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if (!doaccess) {
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if ((p = TZDIR) == NULL)
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return -1;
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if ((strlen(p) + 1 + strlen(name) + 1) >= sizeof fullname)
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return -1;
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(void) strncpy(fullname, p, sizeof(fullname) - 1);
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(void) strncat(fullname, "/", sizeof(fullname) - strlen(fullname) - 1);
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(void) strncat(fullname, name, sizeof(fullname) - strlen(fullname) - 1);
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/*
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** Set doaccess if '.' (as in "../") shows up in name.
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*/
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if (strchr(name, '.') != NULL)
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doaccess = TRUE;
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name = fullname;
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}
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if (doaccess && access(name, R_OK) != 0)
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return -1;
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if ((fid = open(name, OPEN_MODE)) == -1)
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return -1;
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if ((fstat(fid, &stab) < 0) || !S_ISREG(stab.st_mode)) {
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close(fid);
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return -1;
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}
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}
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{
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struct tzhead * tzhp;
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char buf[sizeof *sp + sizeof *tzhp];
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int ttisstdcnt;
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int ttisgmtcnt;
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i = read(fid, buf, sizeof buf);
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if (close(fid) != 0)
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return -1;
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p = buf;
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p += (sizeof tzhp->tzh_magic) + (sizeof tzhp->tzh_reserved);
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ttisstdcnt = (int) detzcode(p);
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p += 4;
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ttisgmtcnt = (int) detzcode(p);
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p += 4;
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sp->leapcnt = (int) detzcode(p);
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p += 4;
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sp->timecnt = (int) detzcode(p);
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p += 4;
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sp->typecnt = (int) detzcode(p);
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p += 4;
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sp->charcnt = (int) detzcode(p);
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p += 4;
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if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS ||
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sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES ||
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sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES ||
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sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS ||
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(ttisstdcnt != sp->typecnt && ttisstdcnt != 0) ||
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(ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0))
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return -1;
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if (i - (p - buf) < sp->timecnt * 4 + /* ats */
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sp->timecnt + /* types */
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sp->typecnt * (4 + 2) + /* ttinfos */
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sp->charcnt + /* chars */
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sp->leapcnt * (4 + 4) + /* lsinfos */
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ttisstdcnt + /* ttisstds */
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ttisgmtcnt) /* ttisgmts */
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return -1;
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for (i = 0; i < sp->timecnt; ++i) {
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sp->ats[i] = detzcode(p);
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p += 4;
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}
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for (i = 0; i < sp->timecnt; ++i) {
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sp->types[i] = (unsigned char) *p++;
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if (sp->types[i] >= sp->typecnt)
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return -1;
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}
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for (i = 0; i < sp->typecnt; ++i) {
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register struct ttinfo * ttisp;
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ttisp = &sp->ttis[i];
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ttisp->tt_gmtoff = detzcode(p);
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p += 4;
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ttisp->tt_isdst = (unsigned char) *p++;
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if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1)
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return -1;
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ttisp->tt_abbrind = (unsigned char) *p++;
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if (ttisp->tt_abbrind < 0 ||
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ttisp->tt_abbrind > sp->charcnt)
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return -1;
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}
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for (i = 0; i < sp->charcnt; ++i)
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sp->chars[i] = *p++;
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sp->chars[i] = '\0'; /* ensure '\0' at end */
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for (i = 0; i < sp->leapcnt; ++i) {
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register struct lsinfo * lsisp;
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lsisp = &sp->lsis[i];
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lsisp->ls_trans = detzcode(p);
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p += 4;
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lsisp->ls_corr = detzcode(p);
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p += 4;
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}
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for (i = 0; i < sp->typecnt; ++i) {
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register struct ttinfo * ttisp;
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ttisp = &sp->ttis[i];
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if (ttisstdcnt == 0)
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ttisp->tt_ttisstd = FALSE;
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else {
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ttisp->tt_ttisstd = *p++;
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if (ttisp->tt_ttisstd != TRUE &&
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ttisp->tt_ttisstd != FALSE)
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return -1;
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}
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}
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for (i = 0; i < sp->typecnt; ++i) {
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register struct ttinfo * ttisp;
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ttisp = &sp->ttis[i];
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if (ttisgmtcnt == 0)
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ttisp->tt_ttisgmt = FALSE;
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else {
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ttisp->tt_ttisgmt = *p++;
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if (ttisp->tt_ttisgmt != TRUE &&
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ttisp->tt_ttisgmt != FALSE)
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return -1;
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}
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}
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}
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return 0;
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}
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static const int mon_lengths[2][MONSPERYEAR] = {
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{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
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{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
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};
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|
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static const int year_lengths[2] = {
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DAYSPERNYEAR, DAYSPERLYEAR
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};
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|
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/*! \brief
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* Given a pointer into a time zone string, extract a number from that string.
|
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* \return Check that the number is within a specified range; if it is not, return
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* NULL.
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* Otherwise, return a pointer to the first character not part of the number.
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*/
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static const char *getnum(register const char *strp, int * const nump, const int min, const int max)
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{
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register char c;
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register int num;
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if (strp == NULL || !is_digit(c = *strp))
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return NULL;
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num = 0;
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do {
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num = num * 10 + (c - '0');
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if (num > max)
|
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return NULL; /* illegal value */
|
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c = *++strp;
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} while (is_digit(c));
|
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if (num < min)
|
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return NULL; /* illegal value */
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*nump = num;
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return strp;
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}
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|
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/*! \brief
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* Given a pointer into a time zone string, extract a number of seconds,
|
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* in hh[:mm[:ss]] form, from the string.
|
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* \return If any error occurs, return NULL.
|
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* Otherwise, return a pointer to the first character not part of the number
|
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* of seconds.
|
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*/
|
|
|
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static const char *getsecs(register const char *strp, long * const secsp)
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{
|
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int num;
|
|
|
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/*
|
|
** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like
|
|
** "M10.4.6/26", which does not conform to Posix,
|
|
** but which specifies the equivalent of
|
|
** ``02:00 on the first Sunday on or after 23 Oct''.
|
|
*/
|
|
strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1);
|
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if (strp == NULL)
|
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return NULL;
|
|
*secsp = num * (long) SECSPERHOUR;
|
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if (*strp == ':') {
|
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++strp;
|
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strp = getnum(strp, &num, 0, MINSPERHOUR - 1);
|
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if (strp == NULL)
|
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return NULL;
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*secsp += num * SECSPERMIN;
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if (*strp == ':') {
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++strp;
|
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/* `SECSPERMIN' allows for leap seconds. */
|
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strp = getnum(strp, &num, 0, SECSPERMIN);
|
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if (strp == NULL)
|
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return NULL;
|
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*secsp += num;
|
|
}
|
|
}
|
|
return strp;
|
|
}
|
|
|
|
/*! \brief
|
|
* Given a pointer into a time zone string, extract an offset, in
|
|
* [+-]hh[:mm[:ss]] form, from the string.
|
|
* \return If any error occurs, return NULL.
|
|
* Otherwise, return a pointer to the first character not part of the time.
|
|
*/
|
|
|
|
static const char * getoffset(register const char *strp, long * const offsetp)
|
|
{
|
|
register int neg = 0;
|
|
|
|
if (*strp == '-') {
|
|
neg = 1;
|
|
++strp;
|
|
} else if (*strp == '+')
|
|
++strp;
|
|
strp = getsecs(strp, offsetp);
|
|
if (strp == NULL)
|
|
return NULL; /* illegal time */
|
|
if (neg)
|
|
*offsetp = -*offsetp;
|
|
return strp;
|
|
}
|
|
|
|
/*! \brief
|
|
* Given a pointer into a time zone string, extract a rule in the form
|
|
* date[/time]. See POSIX section 8 for the format of "date" and "time".
|
|
* \return If a valid rule is not found, return NULL.
|
|
* Otherwise, return a pointer to the first character not part of the rule.
|
|
*/
|
|
|
|
static const char *getrule(const char *strp, register struct rule * const rulep)
|
|
{
|
|
if (*strp == 'J') {
|
|
/*
|
|
** Julian day.
|
|
*/
|
|
rulep->r_type = JULIAN_DAY;
|
|
++strp;
|
|
strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR);
|
|
} else if (*strp == 'M') {
|
|
/*
|
|
** Month, week, day.
|
|
*/
|
|
rulep->r_type = MONTH_NTH_DAY_OF_WEEK;
|
|
++strp;
|
|
strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR);
|
|
if (strp == NULL)
|
|
return NULL;
|
|
if (*strp++ != '.')
|
|
return NULL;
|
|
strp = getnum(strp, &rulep->r_week, 1, 5);
|
|
if (strp == NULL)
|
|
return NULL;
|
|
if (*strp++ != '.')
|
|
return NULL;
|
|
strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1);
|
|
} else if (is_digit(*strp)) {
|
|
/*
|
|
** Day of year.
|
|
*/
|
|
rulep->r_type = DAY_OF_YEAR;
|
|
strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1);
|
|
} else return NULL; /* invalid format */
|
|
if (strp == NULL)
|
|
return NULL;
|
|
if (*strp == '/') {
|
|
/*
|
|
** Time specified.
|
|
*/
|
|
++strp;
|
|
strp = getsecs(strp, &rulep->r_time);
|
|
} else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */
|
|
return strp;
|
|
}
|
|
|
|
/*! \brief
|
|
* Given the Epoch-relative time of January 1, 00:00:00 GMT, in a year, the
|
|
* year, a rule, and the offset from GMT at the time that rule takes effect,
|
|
* calculate the Epoch-relative time that rule takes effect.
|
|
*/
|
|
|
|
static time_t transtime(janfirst, year, rulep, offset)
|
|
const time_t janfirst;
|
|
const int year;
|
|
register const struct rule * const rulep;
|
|
const long offset;
|
|
{
|
|
register int leapyear;
|
|
register time_t value = 0;
|
|
register int i;
|
|
int d, m1, yy0, yy1, yy2, dow;
|
|
|
|
leapyear = isleap(year);
|
|
switch (rulep->r_type) {
|
|
|
|
case JULIAN_DAY:
|
|
/*
|
|
** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap
|
|
** years.
|
|
** In non-leap years, or if the day number is 59 or less, just
|
|
** add SECSPERDAY times the day number-1 to the time of
|
|
** January 1, midnight, to get the day.
|
|
*/
|
|
value = janfirst + (rulep->r_day - 1) * SECSPERDAY;
|
|
if (leapyear && rulep->r_day >= 60)
|
|
value += SECSPERDAY;
|
|
break;
|
|
|
|
case DAY_OF_YEAR:
|
|
/*
|
|
** n - day of year.
|
|
** Just add SECSPERDAY times the day number to the time of
|
|
** January 1, midnight, to get the day.
|
|
*/
|
|
value = janfirst + rulep->r_day * SECSPERDAY;
|
|
break;
|
|
|
|
case MONTH_NTH_DAY_OF_WEEK:
|
|
/*
|
|
** Mm.n.d - nth "dth day" of month m.
|
|
*/
|
|
value = janfirst;
|
|
for (i = 0; i < rulep->r_mon - 1; ++i)
|
|
value += mon_lengths[leapyear][i] * SECSPERDAY;
|
|
|
|
/*
|
|
** Use Zeller's Congruence to get day-of-week of first day of
|
|
** month.
|
|
*/
|
|
m1 = (rulep->r_mon + 9) % 12 + 1;
|
|
yy0 = (rulep->r_mon <= 2) ? (year - 1) : year;
|
|
yy1 = yy0 / 100;
|
|
yy2 = yy0 % 100;
|
|
dow = ((26 * m1 - 2) / 10 +
|
|
1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7;
|
|
if (dow < 0)
|
|
dow += DAYSPERWEEK;
|
|
|
|
/*
|
|
** "dow" is the day-of-week of the first day of the month. Get
|
|
** the day-of-month (zero-origin) of the first "dow" day of the
|
|
** month.
|
|
*/
|
|
d = rulep->r_day - dow;
|
|
if (d < 0)
|
|
d += DAYSPERWEEK;
|
|
for (i = 1; i < rulep->r_week; ++i) {
|
|
if (d + DAYSPERWEEK >=
|
|
mon_lengths[leapyear][rulep->r_mon - 1])
|
|
break;
|
|
d += DAYSPERWEEK;
|
|
}
|
|
|
|
/*
|
|
** "d" is the day-of-month (zero-origin) of the day we want.
|
|
*/
|
|
value += d * SECSPERDAY;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
** "value" is the Epoch-relative time of 00:00:00 GMT on the day in
|
|
** question. To get the Epoch-relative time of the specified local
|
|
** time on that day, add the transition time and the current offset
|
|
** from GMT.
|
|
*/
|
|
return value + rulep->r_time + offset;
|
|
}
|
|
|
|
/*
|
|
** Given a POSIX section 8-style TZ string, fill in the rule tables as
|
|
** appropriate.
|
|
*/
|
|
|
|
static int
|
|
tzparse(name, sp, lastditch)
|
|
const char * name;
|
|
register struct state * const sp;
|
|
const int lastditch;
|
|
{
|
|
const char * stdname;
|
|
const char * dstname = NULL;
|
|
size_t stdlen = 0;
|
|
size_t dstlen = 0;
|
|
long stdoffset = 0L;
|
|
long dstoffset = 0L;
|
|
register time_t * atp;
|
|
register unsigned char * typep;
|
|
register char * cp;
|
|
register int load_result;
|
|
|
|
stdname = name;
|
|
#ifdef DEBUG
|
|
fprintf(stderr, "tzparse(): loading default rules\n");
|
|
#endif
|
|
load_result = tzload(TZDEFRULES, sp);
|
|
if (load_result != 0)
|
|
sp->leapcnt = 0; /* so, we're off a little */
|
|
if (*name != '\0') {
|
|
if (*name != '\0' && *name != ',' && *name != ';') {
|
|
name = getoffset(name, &dstoffset);
|
|
if (name == NULL)
|
|
return -1;
|
|
} else dstoffset = stdoffset - SECSPERHOUR;
|
|
if (*name == ',' || *name == ';') {
|
|
struct rule start;
|
|
struct rule end;
|
|
register int year;
|
|
register time_t janfirst;
|
|
time_t starttime;
|
|
time_t endtime;
|
|
|
|
++name;
|
|
if ((name = getrule(name, &start)) == NULL)
|
|
return -1;
|
|
if (*name++ != ',')
|
|
return -1;
|
|
if ((name = getrule(name, &end)) == NULL)
|
|
return -1;
|
|
if (*name != '\0')
|
|
return -1;
|
|
sp->typecnt = 2; /* standard time and DST */
|
|
/*
|
|
** Two transitions per year, from EPOCH_YEAR to 2037.
|
|
*/
|
|
sp->timecnt = 2 * (2037 - EPOCH_YEAR + 1);
|
|
if (sp->timecnt > TZ_MAX_TIMES)
|
|
return -1;
|
|
sp->ttis[0].tt_gmtoff = -dstoffset;
|
|
sp->ttis[0].tt_isdst = 1;
|
|
sp->ttis[0].tt_abbrind = stdlen + 1;
|
|
sp->ttis[1].tt_gmtoff = -stdoffset;
|
|
sp->ttis[1].tt_isdst = 0;
|
|
sp->ttis[1].tt_abbrind = 0;
|
|
atp = sp->ats;
|
|
typep = sp->types;
|
|
janfirst = 0;
|
|
for (year = EPOCH_YEAR; year <= 2037; ++year) {
|
|
starttime = transtime(janfirst, year, &start,
|
|
stdoffset);
|
|
endtime = transtime(janfirst, year, &end,
|
|
dstoffset);
|
|
if (starttime > endtime) {
|
|
*atp++ = endtime;
|
|
*typep++ = 1; /* DST ends */
|
|
*atp++ = starttime;
|
|
*typep++ = 0; /* DST begins */
|
|
} else {
|
|
*atp++ = starttime;
|
|
*typep++ = 0; /* DST begins */
|
|
*atp++ = endtime;
|
|
*typep++ = 1; /* DST ends */
|
|
}
|
|
janfirst += year_lengths[isleap(year)] *
|
|
SECSPERDAY;
|
|
}
|
|
} else {
|
|
register long theirstdoffset;
|
|
register long theirdstoffset;
|
|
register long theiroffset;
|
|
register int isdst;
|
|
register int i;
|
|
register int j;
|
|
|
|
if (*name != '\0')
|
|
return -1;
|
|
if (load_result != 0)
|
|
return -1;
|
|
/*
|
|
** Initial values of theirstdoffset and theirdstoffset.
|
|
*/
|
|
theirstdoffset = 0;
|
|
for (i = 0; i < sp->timecnt; ++i) {
|
|
j = sp->types[i];
|
|
if (!sp->ttis[j].tt_isdst) {
|
|
theirstdoffset =
|
|
-sp->ttis[j].tt_gmtoff;
|
|
break;
|
|
}
|
|
}
|
|
theirdstoffset = 0;
|
|
for (i = 0; i < sp->timecnt; ++i) {
|
|
j = sp->types[i];
|
|
if (sp->ttis[j].tt_isdst) {
|
|
theirdstoffset =
|
|
-sp->ttis[j].tt_gmtoff;
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
** Initially we're assumed to be in standard time.
|
|
*/
|
|
isdst = FALSE;
|
|
theiroffset = theirstdoffset;
|
|
/*
|
|
** Now juggle transition times and types
|
|
** tracking offsets as you do.
|
|
*/
|
|
for (i = 0; i < sp->timecnt; ++i) {
|
|
j = sp->types[i];
|
|
sp->types[i] = sp->ttis[j].tt_isdst;
|
|
if (sp->ttis[j].tt_ttisgmt) {
|
|
/* No adjustment to transition time */
|
|
} else {
|
|
/*
|
|
** If summer time is in effect, and the
|
|
** transition time was not specified as
|
|
** standard time, add the summer time
|
|
** offset to the transition time;
|
|
** otherwise, add the standard time
|
|
** offset to the transition time.
|
|
*/
|
|
/*
|
|
** Transitions from DST to DDST
|
|
** will effectively disappear since
|
|
** POSIX provides for only one DST
|
|
** offset.
|
|
*/
|
|
if (isdst && !sp->ttis[j].tt_ttisstd) {
|
|
sp->ats[i] += dstoffset -
|
|
theirdstoffset;
|
|
} else {
|
|
sp->ats[i] += stdoffset -
|
|
theirstdoffset;
|
|
}
|
|
}
|
|
theiroffset = -sp->ttis[j].tt_gmtoff;
|
|
if (sp->ttis[j].tt_isdst)
|
|
theirdstoffset = theiroffset;
|
|
else theirstdoffset = theiroffset;
|
|
}
|
|
/*
|
|
** Finally, fill in ttis.
|
|
** ttisstd and ttisgmt need not be handled.
|
|
*/
|
|
sp->ttis[0].tt_gmtoff = -stdoffset;
|
|
sp->ttis[0].tt_isdst = FALSE;
|
|
sp->ttis[0].tt_abbrind = 0;
|
|
sp->ttis[1].tt_gmtoff = -dstoffset;
|
|
sp->ttis[1].tt_isdst = TRUE;
|
|
sp->ttis[1].tt_abbrind = stdlen + 1;
|
|
}
|
|
} else {
|
|
dstlen = 0;
|
|
sp->typecnt = 1; /* only standard time */
|
|
sp->timecnt = 0;
|
|
sp->ttis[0].tt_gmtoff = -stdoffset;
|
|
sp->ttis[0].tt_isdst = 0;
|
|
sp->ttis[0].tt_abbrind = 0;
|
|
}
|
|
sp->charcnt = stdlen + 1;
|
|
if (dstlen != 0)
|
|
sp->charcnt += dstlen + 1;
|
|
if (sp->charcnt > sizeof sp->chars)
|
|
return -1;
|
|
cp = sp->chars;
|
|
(void) strncpy(cp, stdname, stdlen);
|
|
cp += stdlen;
|
|
*cp++ = '\0';
|
|
if (dstlen != 0) {
|
|
(void) strncpy(cp, dstname, dstlen);
|
|
*(cp + dstlen) = '\0';
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
gmtload(sp)
|
|
struct state * const sp;
|
|
{
|
|
if (tzload(gmt, sp) != 0)
|
|
(void) tzparse(gmt, sp, TRUE);
|
|
}
|
|
|
|
/*
|
|
** A non-static declaration of ast_tzsetwall in a system header file
|
|
** may cause a warning about this upcoming static declaration...
|
|
*/
|
|
static
|
|
#ifdef _THREAD_SAFE
|
|
int
|
|
ast_tzsetwall_basic P((void))
|
|
#else
|
|
int
|
|
ast_tzsetwall P((void))
|
|
#endif
|
|
{
|
|
struct state *cur_state = lclptr;
|
|
|
|
/* Find the appropriate structure, if already parsed */
|
|
while (cur_state != NULL) {
|
|
if (cur_state->name[0] == '\0')
|
|
break;
|
|
cur_state = cur_state->next;
|
|
}
|
|
if (cur_state != NULL)
|
|
return 0;
|
|
cur_state = malloc(sizeof(struct state));
|
|
if (cur_state == NULL) {
|
|
return -1;
|
|
}
|
|
memset(cur_state,0,sizeof(struct state));
|
|
if (tzload((char *) NULL, cur_state) != 0)
|
|
#ifdef DEBUG
|
|
{
|
|
fprintf(stderr, "ast_tzsetwall: calling gmtload()\n");
|
|
#endif
|
|
gmtload(cur_state);
|
|
#ifdef DEBUG
|
|
}
|
|
#endif
|
|
|
|
if (last_lclptr)
|
|
last_lclptr->next = cur_state;
|
|
else
|
|
lclptr = cur_state;
|
|
last_lclptr = cur_state;
|
|
return 0;
|
|
}
|
|
|
|
#ifdef _THREAD_SAFE
|
|
int
|
|
ast_tzsetwall P((void))
|
|
{
|
|
ast_mutex_lock(&tzsetwall_mutex);
|
|
ast_tzsetwall_basic();
|
|
ast_mutex_unlock(&tzsetwall_mutex);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef _THREAD_SAFE
|
|
static int
|
|
ast_tzset_basic P((const char *name))
|
|
#else
|
|
int
|
|
ast_tzset P((const char *name))
|
|
#endif
|
|
{
|
|
struct state *cur_state = lclptr;
|
|
|
|
/* Not set at all */
|
|
if (name == NULL) {
|
|
return ast_tzsetwall();
|
|
}
|
|
|
|
/* Find the appropriate structure, if already parsed */
|
|
while (cur_state != NULL) {
|
|
if (!strcmp(cur_state->name,name))
|
|
break;
|
|
cur_state = cur_state->next;
|
|
}
|
|
if (cur_state != NULL)
|
|
return 0;
|
|
|
|
cur_state = malloc(sizeof(struct state));
|
|
if (cur_state == NULL) {
|
|
return -1;
|
|
}
|
|
memset(cur_state,0,sizeof(*cur_state));
|
|
|
|
/* Name is set, but set to the empty string == no adjustments */
|
|
if (name[0] == '\0') {
|
|
/*
|
|
** User wants it fast rather than right.
|
|
*/
|
|
cur_state->leapcnt = 0; /* so, we're off a little */
|
|
cur_state->timecnt = 0;
|
|
cur_state->ttis[0].tt_gmtoff = 0;
|
|
cur_state->ttis[0].tt_abbrind = 0;
|
|
(void) strncpy(cur_state->chars, gmt, sizeof(cur_state->chars) - 1);
|
|
} else if (tzload(name, cur_state) != 0) {
|
|
if (name[0] == ':') {
|
|
(void) gmtload(cur_state);
|
|
} else if (tzparse(name, cur_state, FALSE) != 0) {
|
|
/* If not found, load localtime */
|
|
if (tzload("/etc/localtime", cur_state) != 0)
|
|
/* Last ditch, get GMT */
|
|
(void) gmtload(cur_state);
|
|
}
|
|
}
|
|
strncpy(cur_state->name, name, sizeof(cur_state->name) - 1);
|
|
if (last_lclptr)
|
|
last_lclptr->next = cur_state;
|
|
else
|
|
lclptr = cur_state;
|
|
last_lclptr = cur_state;
|
|
return 0;
|
|
}
|
|
|
|
#ifdef _THREAD_SAFE
|
|
void
|
|
ast_tzset P((const char *name))
|
|
{
|
|
ast_mutex_lock(&tzset_mutex);
|
|
ast_tzset_basic(name);
|
|
ast_mutex_unlock(&tzset_mutex);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
** The easy way to behave "as if no library function calls" localtime
|
|
** is to not call it--so we drop its guts into "localsub", which can be
|
|
** freely called. (And no, the PANS doesn't require the above behavior--
|
|
** but it *is* desirable.)
|
|
**
|
|
** The unused offset argument is for the benefit of mktime variants.
|
|
*/
|
|
|
|
/*ARGSUSED*/
|
|
static void
|
|
localsub(timep, offset, tmp, zone)
|
|
const time_t * const timep;
|
|
const long offset;
|
|
struct tm * const tmp;
|
|
const char * const zone;
|
|
{
|
|
register struct state * sp;
|
|
register const struct ttinfo * ttisp;
|
|
register int i;
|
|
const time_t t = *timep;
|
|
|
|
sp = lclptr;
|
|
/* Find the right zone record */
|
|
if (zone == NULL)
|
|
sp = NULL;
|
|
else
|
|
while (sp != NULL) {
|
|
if (!strcmp(sp->name,zone))
|
|
break;
|
|
sp = sp->next;
|
|
}
|
|
|
|
if (sp == NULL) {
|
|
ast_tzsetwall();
|
|
sp = lclptr;
|
|
/* Find the default zone record */
|
|
while (sp != NULL) {
|
|
if (sp->name[0] == '\0')
|
|
break;
|
|
sp = sp->next;
|
|
}
|
|
}
|
|
|
|
/* Last ditch effort, use GMT */
|
|
if (sp == NULL) {
|
|
gmtsub(timep, offset, tmp, zone);
|
|
return;
|
|
}
|
|
if (sp->timecnt == 0 || t < sp->ats[0]) {
|
|
i = 0;
|
|
while (sp->ttis[i].tt_isdst)
|
|
if (++i >= sp->typecnt) {
|
|
i = 0;
|
|
break;
|
|
}
|
|
} else {
|
|
for (i = 1; i < sp->timecnt; ++i)
|
|
if (t < sp->ats[i])
|
|
break;
|
|
i = sp->types[i - 1];
|
|
}
|
|
ttisp = &sp->ttis[i];
|
|
/*
|
|
** To get (wrong) behavior that's compatible with System V Release 2.0
|
|
** you'd replace the statement below with
|
|
** t += ttisp->tt_gmtoff;
|
|
** timesub(&t, 0L, sp, tmp);
|
|
*/
|
|
timesub(&t, ttisp->tt_gmtoff, sp, tmp);
|
|
tmp->tm_isdst = ttisp->tt_isdst;
|
|
tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind];
|
|
#ifdef TM_ZONE
|
|
tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind];
|
|
#endif /* defined TM_ZONE */
|
|
}
|
|
|
|
struct tm *
|
|
ast_localtime(timep, p_tm, zone)
|
|
const time_t * const timep;
|
|
struct tm *p_tm;
|
|
const char * const zone;
|
|
{
|
|
#ifdef _THREAD_SAFE
|
|
ast_mutex_lock(&lcl_mutex);
|
|
#endif
|
|
ast_tzset(zone);
|
|
localsub(timep, 0L, p_tm, zone);
|
|
#ifdef _THREAD_SAFE
|
|
ast_mutex_unlock(&lcl_mutex);
|
|
#endif
|
|
return(p_tm);
|
|
}
|
|
|
|
/*
|
|
** gmtsub is to gmtime as localsub is to localtime.
|
|
*/
|
|
|
|
static void
|
|
gmtsub(timep, offset, tmp, zone)
|
|
const time_t * const timep;
|
|
const long offset;
|
|
struct tm * const tmp;
|
|
const char * const zone;
|
|
{
|
|
#ifdef _THREAD_SAFE
|
|
ast_mutex_lock(&gmt_mutex);
|
|
#endif
|
|
if (!gmt_is_set) {
|
|
gmt_is_set = TRUE;
|
|
gmtptr = (struct state *) malloc(sizeof *gmtptr);
|
|
if (gmtptr != NULL)
|
|
gmtload(gmtptr);
|
|
}
|
|
ast_mutex_unlock(&gmt_mutex);
|
|
timesub(timep, offset, gmtptr, tmp);
|
|
#ifdef TM_ZONE
|
|
/*
|
|
** Could get fancy here and deliver something such as
|
|
** "GMT+xxxx" or "GMT-xxxx" if offset is non-zero,
|
|
** but this is no time for a treasure hunt.
|
|
*/
|
|
if (offset != 0)
|
|
tmp->TM_ZONE = wildabbr;
|
|
else {
|
|
if (gmtptr == NULL)
|
|
tmp->TM_ZONE = gmt;
|
|
else tmp->TM_ZONE = gmtptr->chars;
|
|
}
|
|
#endif /* defined TM_ZONE */
|
|
}
|
|
|
|
static void
|
|
timesub(timep, offset, sp, tmp)
|
|
const time_t * const timep;
|
|
const long offset;
|
|
register const struct state * const sp;
|
|
register struct tm * const tmp;
|
|
{
|
|
register const struct lsinfo * lp;
|
|
register long days;
|
|
register long rem;
|
|
register int y;
|
|
register int yleap;
|
|
register const int * ip;
|
|
register long corr;
|
|
register int hit;
|
|
register int i;
|
|
|
|
corr = 0;
|
|
hit = 0;
|
|
i = (sp == NULL) ? 0 : sp->leapcnt;
|
|
while (--i >= 0) {
|
|
lp = &sp->lsis[i];
|
|
if (*timep >= lp->ls_trans) {
|
|
if (*timep == lp->ls_trans) {
|
|
hit = ((i == 0 && lp->ls_corr > 0) ||
|
|
lp->ls_corr > sp->lsis[i - 1].ls_corr);
|
|
if (hit)
|
|
while (i > 0 &&
|
|
sp->lsis[i].ls_trans ==
|
|
sp->lsis[i - 1].ls_trans + 1 &&
|
|
sp->lsis[i].ls_corr ==
|
|
sp->lsis[i - 1].ls_corr + 1) {
|
|
++hit;
|
|
--i;
|
|
}
|
|
}
|
|
corr = lp->ls_corr;
|
|
break;
|
|
}
|
|
}
|
|
days = *timep / SECSPERDAY;
|
|
rem = *timep % SECSPERDAY;
|
|
#ifdef mc68k
|
|
if (*timep == 0x80000000) {
|
|
/*
|
|
** A 3B1 muffs the division on the most negative number.
|
|
*/
|
|
days = -24855;
|
|
rem = -11648;
|
|
}
|
|
#endif /* defined mc68k */
|
|
rem += (offset - corr);
|
|
while (rem < 0) {
|
|
rem += SECSPERDAY;
|
|
--days;
|
|
}
|
|
while (rem >= SECSPERDAY) {
|
|
rem -= SECSPERDAY;
|
|
++days;
|
|
}
|
|
tmp->tm_hour = (int) (rem / SECSPERHOUR);
|
|
rem = rem % SECSPERHOUR;
|
|
tmp->tm_min = (int) (rem / SECSPERMIN);
|
|
/*
|
|
** A positive leap second requires a special
|
|
** representation. This uses "... ??:59:60" et seq.
|
|
*/
|
|
tmp->tm_sec = (int) (rem % SECSPERMIN) + hit;
|
|
tmp->tm_wday = (int) ((EPOCH_WDAY + days) % DAYSPERWEEK);
|
|
if (tmp->tm_wday < 0)
|
|
tmp->tm_wday += DAYSPERWEEK;
|
|
y = EPOCH_YEAR;
|
|
#define LEAPS_THRU_END_OF(y) ((y) / 4 - (y) / 100 + (y) / 400)
|
|
while (days < 0 || days >= (long) year_lengths[yleap = isleap(y)]) {
|
|
register int newy;
|
|
|
|
newy = y + days / DAYSPERNYEAR;
|
|
if (days < 0)
|
|
--newy;
|
|
days -= (newy - y) * DAYSPERNYEAR +
|
|
LEAPS_THRU_END_OF(newy - 1) -
|
|
LEAPS_THRU_END_OF(y - 1);
|
|
y = newy;
|
|
}
|
|
tmp->tm_year = y - TM_YEAR_BASE;
|
|
tmp->tm_yday = (int) days;
|
|
ip = mon_lengths[yleap];
|
|
for (tmp->tm_mon = 0; days >= (long) ip[tmp->tm_mon]; ++(tmp->tm_mon))
|
|
days = days - (long) ip[tmp->tm_mon];
|
|
tmp->tm_mday = (int) (days + 1);
|
|
tmp->tm_isdst = 0;
|
|
#ifdef TM_GMTOFF
|
|
tmp->TM_GMTOFF = offset;
|
|
#endif /* defined TM_GMTOFF */
|
|
}
|
|
|
|
char *
|
|
ast_ctime(timep)
|
|
const time_t * const timep;
|
|
{
|
|
/*
|
|
** Section 4.12.3.2 of X3.159-1989 requires that
|
|
** The ctime funciton converts the calendar time pointed to by timer
|
|
** to local time in the form of a string. It is equivalent to
|
|
** asctime(localtime(timer))
|
|
*/
|
|
return asctime(localtime(timep));
|
|
}
|
|
|
|
char *
|
|
ast_ctime_r(timep, buf)
|
|
const time_t * const timep;
|
|
char *buf;
|
|
{
|
|
struct tm tm;
|
|
#ifdef SOLARIS
|
|
return asctime_r(localtime_r(timep, &tm), buf, 256);
|
|
#else
|
|
return asctime_r(localtime_r(timep, &tm), buf);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
** Adapted from code provided by Robert Elz, who writes:
|
|
** The "best" way to do mktime I think is based on an idea of Bob
|
|
** Kridle's (so its said...) from a long time ago.
|
|
** [kridle@xinet.com as of 1996-01-16.]
|
|
** It does a binary search of the time_t space. Since time_t's are
|
|
** just 32 bits, its a max of 32 iterations (even at 64 bits it
|
|
** would still be very reasonable).
|
|
*/
|
|
|
|
#ifndef WRONG
|
|
#define WRONG (-1)
|
|
#endif /* !defined WRONG */
|
|
|
|
/*
|
|
** Simplified normalize logic courtesy Paul Eggert (eggert@twinsun.com).
|
|
*/
|
|
|
|
static int
|
|
increment_overflow(number, delta)
|
|
int * number;
|
|
int delta;
|
|
{
|
|
int number0;
|
|
|
|
number0 = *number;
|
|
*number += delta;
|
|
return (*number < number0) != (delta < 0);
|
|
}
|
|
|
|
static int
|
|
normalize_overflow(tensptr, unitsptr, base)
|
|
int * const tensptr;
|
|
int * const unitsptr;
|
|
const int base;
|
|
{
|
|
register int tensdelta;
|
|
|
|
tensdelta = (*unitsptr >= 0) ?
|
|
(*unitsptr / base) :
|
|
(-1 - (-1 - *unitsptr) / base);
|
|
*unitsptr -= tensdelta * base;
|
|
return increment_overflow(tensptr, tensdelta);
|
|
}
|
|
|
|
static int
|
|
tmcomp(atmp, btmp)
|
|
register const struct tm * const atmp;
|
|
register const struct tm * const btmp;
|
|
{
|
|
register int result;
|
|
|
|
if ((result = (atmp->tm_year - btmp->tm_year)) == 0 &&
|
|
(result = (atmp->tm_mon - btmp->tm_mon)) == 0 &&
|
|
(result = (atmp->tm_mday - btmp->tm_mday)) == 0 &&
|
|
(result = (atmp->tm_hour - btmp->tm_hour)) == 0 &&
|
|
(result = (atmp->tm_min - btmp->tm_min)) == 0)
|
|
result = atmp->tm_sec - btmp->tm_sec;
|
|
return result;
|
|
}
|
|
|
|
static time_t
|
|
time2(tmp, funcp, offset, okayp, zone)
|
|
struct tm * const tmp;
|
|
void (* const funcp) P((const time_t*, long, struct tm*, const char*));
|
|
const long offset;
|
|
int * const okayp;
|
|
const char * const zone;
|
|
{
|
|
register const struct state * sp;
|
|
register int dir;
|
|
register int bits;
|
|
register int i, j ;
|
|
register int saved_seconds;
|
|
time_t newt;
|
|
time_t t;
|
|
struct tm yourtm, mytm;
|
|
|
|
*okayp = FALSE;
|
|
yourtm = *tmp;
|
|
if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR))
|
|
return WRONG;
|
|
if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY))
|
|
return WRONG;
|
|
if (normalize_overflow(&yourtm.tm_year, &yourtm.tm_mon, MONSPERYEAR))
|
|
return WRONG;
|
|
/*
|
|
** Turn yourtm.tm_year into an actual year number for now.
|
|
** It is converted back to an offset from TM_YEAR_BASE later.
|
|
*/
|
|
if (increment_overflow(&yourtm.tm_year, TM_YEAR_BASE))
|
|
return WRONG;
|
|
while (yourtm.tm_mday <= 0) {
|
|
if (increment_overflow(&yourtm.tm_year, -1))
|
|
return WRONG;
|
|
i = yourtm.tm_year + (1 < yourtm.tm_mon);
|
|
yourtm.tm_mday += year_lengths[isleap(i)];
|
|
}
|
|
while (yourtm.tm_mday > DAYSPERLYEAR) {
|
|
i = yourtm.tm_year + (1 < yourtm.tm_mon);
|
|
yourtm.tm_mday -= year_lengths[isleap(i)];
|
|
if (increment_overflow(&yourtm.tm_year, 1))
|
|
return WRONG;
|
|
}
|
|
for ( ; ; ) {
|
|
i = mon_lengths[isleap(yourtm.tm_year)][yourtm.tm_mon];
|
|
if (yourtm.tm_mday <= i)
|
|
break;
|
|
yourtm.tm_mday -= i;
|
|
if (++yourtm.tm_mon >= MONSPERYEAR) {
|
|
yourtm.tm_mon = 0;
|
|
if (increment_overflow(&yourtm.tm_year, 1))
|
|
return WRONG;
|
|
}
|
|
}
|
|
if (increment_overflow(&yourtm.tm_year, -TM_YEAR_BASE))
|
|
return WRONG;
|
|
if (yourtm.tm_year + TM_YEAR_BASE < EPOCH_YEAR) {
|
|
/*
|
|
** We can't set tm_sec to 0, because that might push the
|
|
** time below the minimum representable time.
|
|
** Set tm_sec to 59 instead.
|
|
** This assumes that the minimum representable time is
|
|
** not in the same minute that a leap second was deleted from,
|
|
** which is a safer assumption than using 58 would be.
|
|
*/
|
|
if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN))
|
|
return WRONG;
|
|
saved_seconds = yourtm.tm_sec;
|
|
yourtm.tm_sec = SECSPERMIN - 1;
|
|
} else {
|
|
saved_seconds = yourtm.tm_sec;
|
|
yourtm.tm_sec = 0;
|
|
}
|
|
/*
|
|
** Divide the search space in half
|
|
** (this works whether time_t is signed or unsigned).
|
|
*/
|
|
bits = TYPE_BIT(time_t) - 1;
|
|
/*
|
|
** If time_t is signed, then 0 is just above the median,
|
|
** assuming two's complement arithmetic.
|
|
** If time_t is unsigned, then (1 << bits) is just above the median.
|
|
*/
|
|
t = TYPE_SIGNED(time_t) ? 0 : (((time_t) 1) << bits);
|
|
for ( ; ; ) {
|
|
(*funcp)(&t, offset, &mytm, zone);
|
|
dir = tmcomp(&mytm, &yourtm);
|
|
if (dir != 0) {
|
|
if (bits-- < 0)
|
|
return WRONG;
|
|
if (bits < 0)
|
|
--t; /* may be needed if new t is minimal */
|
|
else if (dir > 0)
|
|
t -= ((time_t) 1) << bits;
|
|
else t += ((time_t) 1) << bits;
|
|
continue;
|
|
}
|
|
if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst)
|
|
break;
|
|
/*
|
|
** Right time, wrong type.
|
|
** Hunt for right time, right type.
|
|
** It's okay to guess wrong since the guess
|
|
** gets checked.
|
|
*/
|
|
/*
|
|
** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's.
|
|
*/
|
|
sp = (const struct state *)
|
|
(((void *) funcp == (void *) localsub) ?
|
|
lclptr : gmtptr);
|
|
if (sp == NULL)
|
|
return WRONG;
|
|
for (i = sp->typecnt - 1; i >= 0; --i) {
|
|
if (sp->ttis[i].tt_isdst != yourtm.tm_isdst)
|
|
continue;
|
|
for (j = sp->typecnt - 1; j >= 0; --j) {
|
|
if (sp->ttis[j].tt_isdst == yourtm.tm_isdst)
|
|
continue;
|
|
newt = t + sp->ttis[j].tt_gmtoff -
|
|
sp->ttis[i].tt_gmtoff;
|
|
(*funcp)(&newt, offset, &mytm, zone);
|
|
if (tmcomp(&mytm, &yourtm) != 0)
|
|
continue;
|
|
if (mytm.tm_isdst != yourtm.tm_isdst)
|
|
continue;
|
|
/*
|
|
** We have a match.
|
|
*/
|
|
t = newt;
|
|
goto label;
|
|
}
|
|
}
|
|
return WRONG;
|
|
}
|
|
label:
|
|
newt = t + saved_seconds;
|
|
if ((newt < t) != (saved_seconds < 0))
|
|
return WRONG;
|
|
t = newt;
|
|
(*funcp)(&t, offset, tmp, zone);
|
|
*okayp = TRUE;
|
|
return t;
|
|
}
|
|
|
|
static time_t
|
|
time1(tmp, funcp, offset, zone)
|
|
struct tm * const tmp;
|
|
void (* const funcp) P((const time_t *, long, struct tm *, const char*));
|
|
const long offset;
|
|
const char * const zone;
|
|
{
|
|
register time_t t;
|
|
register const struct state * sp;
|
|
register int samei, otheri;
|
|
int okay;
|
|
|
|
if (tmp->tm_isdst > 1)
|
|
tmp->tm_isdst = 1;
|
|
t = time2(tmp, funcp, offset, &okay, zone);
|
|
#ifdef PCTS
|
|
/*
|
|
** PCTS code courtesy Grant Sullivan (grant@osf.org).
|
|
*/
|
|
if (okay)
|
|
return t;
|
|
if (tmp->tm_isdst < 0)
|
|
tmp->tm_isdst = 0; /* reset to std and try again */
|
|
#endif /* defined PCTS */
|
|
#ifndef PCTS
|
|
if (okay || tmp->tm_isdst < 0)
|
|
return t;
|
|
#endif /* !defined PCTS */
|
|
/*
|
|
** We're supposed to assume that somebody took a time of one type
|
|
** and did some math on it that yielded a "struct tm" that's bad.
|
|
** We try to divine the type they started from and adjust to the
|
|
** type they need.
|
|
*/
|
|
/*
|
|
** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's.
|
|
*/
|
|
sp = (const struct state *) (((void *) funcp == (void *) localsub) ?
|
|
lclptr : gmtptr);
|
|
if (sp == NULL)
|
|
return WRONG;
|
|
for (samei = sp->typecnt - 1; samei >= 0; --samei) {
|
|
if (sp->ttis[samei].tt_isdst != tmp->tm_isdst)
|
|
continue;
|
|
for (otheri = sp->typecnt - 1; otheri >= 0; --otheri) {
|
|
if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst)
|
|
continue;
|
|
tmp->tm_sec += sp->ttis[otheri].tt_gmtoff -
|
|
sp->ttis[samei].tt_gmtoff;
|
|
tmp->tm_isdst = !tmp->tm_isdst;
|
|
t = time2(tmp, funcp, offset, &okay, zone);
|
|
if (okay)
|
|
return t;
|
|
tmp->tm_sec -= sp->ttis[otheri].tt_gmtoff -
|
|
sp->ttis[samei].tt_gmtoff;
|
|
tmp->tm_isdst = !tmp->tm_isdst;
|
|
}
|
|
}
|
|
return WRONG;
|
|
}
|
|
|
|
time_t
|
|
ast_mktime(tmp,zone)
|
|
struct tm * const tmp;
|
|
const char * const zone;
|
|
{
|
|
time_t mktime_return_value;
|
|
#ifdef _THREAD_SAFE
|
|
ast_mutex_lock(&lcl_mutex);
|
|
#endif
|
|
ast_tzset(zone);
|
|
mktime_return_value = time1(tmp, localsub, 0L, zone);
|
|
#ifdef _THREAD_SAFE
|
|
ast_mutex_unlock(&lcl_mutex);
|
|
#endif
|
|
return(mktime_return_value);
|
|
}
|
|
|