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/* PEAK Library |
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* |
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* Copyright (c) 2003,2004 |
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* Stephane Thiell <mbuna@bugged.org>. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#define RCSID "$Id: tz.c,v 1.5 2005/01/27 16:31:50 mbuna Exp $" |
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|
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#ifdef HAVE_CONFIG_H |
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#include "config.h" |
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#endif |
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|
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#include <peak/tz.h> |
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#include <peak/alloc.h> |
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#include <peak/dict.h> |
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#include "fileutils.h" |
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#include "internal.h" |
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|
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#ifdef HAVE_ALLOCA_H |
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#include <alloca.h> |
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#endif |
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#include <assert.h> |
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#include <limits.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <sys/types.h> |
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#include <sys/param.h> |
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#include <sys/time.h> |
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#include <string.h> |
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#include <unistd.h> |
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#ifdef HAVE_TZFILE_H |
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#include <tzfile.h> |
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#endif |
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|
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#ifndef HAVE_STRUCT_TZHEAD |
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struct tzhead |
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{ |
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char tzh_reserved[24]; /* reserved for future use */ |
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char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ |
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char tzh_leapcnt[4]; /* coded number of leap seconds */ |
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char tzh_timecnt[4]; /* coded number of transition times */ |
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char tzh_typecnt[4]; /* coded number of local time types */ |
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char tzh_charcnt[4]; /* coded number of abbr. chars */ |
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}; |
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#endif |
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|
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#ifndef TZDIR |
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#define TZDIR "/usr/share/zoneinfo" |
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#endif |
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#ifndef TZDEFAULT |
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#define TZDEFAULT "/etc/localtime" |
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#endif |
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|
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static const peak_dict_init_entry abbrev2name[] = |
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{ { "ADT", "America/Halifax" }, |
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{ "AFT", "Asia/Kabul" }, |
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{ "AKDT", "America/Juneau" }, |
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{ "AKST", "America/Juneau" }, |
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{ "AST", "America/Halifax" }, |
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{ "CDT", "America/Chicago" }, |
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{ "CEST", "Europe/Rome" }, |
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{ "CET", "Europe/Rome" }, |
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{ "CST", "America/Chicago" }, |
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{ "EDT", "America/New_York" }, |
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{ "EEST", "Europe/Warsaw" }, |
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{ "EET", "Europe/Warsaw" }, |
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{ "EST", "America/New_York" }, |
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{ "GMT", "GMT" }, |
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{ "HKST", "Asia/Hong_Kong" }, |
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{ "HST", "Pacific/Honolulu" }, |
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{ "JST", "Asia/Tokyo" }, |
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{ "MDT", "America/Denver" }, |
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{ "MSD", "Europe/Moscow" }, |
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{ "MSK", "Europe/Moscow" }, |
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{ "MST", "America/Denver" }, |
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{ "NZDT", "Pacific/Auckland" }, |
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{ "NZST", "Pacific/Auckland" }, |
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{ "PDT", "America/Los_Angeles" }, |
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{ "PST", "America/Los_Angeles" }, |
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{ "UTC", "UTC" }, |
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{ "WEST", "Europe/Paris" }, |
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{ "WET", "Europe/Paris" }, |
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{ "YDT", "America/Yakutat" }, |
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{ "YST", "America/Yakutat" } |
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}; |
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|
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#define NUM_ABBREV (sizeof(abbrev2name)/sizeof(peak_dict_init_entry)) |
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|
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struct __peak_tz_period |
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{ |
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time_t start; |
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const char *abbrev; |
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int32_t info; /* bit 30 stolen for DST - the rest is the offset */ |
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}; |
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|
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struct __peak_tz |
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{ |
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PEAK_STRUCT_RT_HEADER; |
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const char *_name; |
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struct __peak_tz_period *_periods; |
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int _period_cnt; |
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}; |
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|
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|
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static void __peak_tz_init(peak_tz tz, va_list vp, void *ctcx); |
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static void __peak_tz_finalize(peak_tz tz); |
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static struct __peak_tz_period * __peak_tz_bsearch_period(peak_tz tz, |
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time_t at); |
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|
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PEAK_CLASS_BASE_DECLARE(tz); |
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|
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|
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/* Helpers */ |
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|
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static int32_t |
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__peak_tz_detzcode(const char * const codep) |
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{ |
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int32_t result; |
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int i; |
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|
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result = (int32_t)((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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|
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void |
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__peak_tz_period_init(struct __peak_tz_period *period, int32_t start, |
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const char *abbrev, int32_t offset, int dst) |
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{ |
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period->start = start; |
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period->abbrev = peak_strdup(abbrev); |
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period->info = abs(offset); |
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|
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if (offset < 0) |
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period->info |= (1 << 31); |
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if (dst) |
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period->info |= (1 << 30); |
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else |
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period->info &= ~(1 << 30); |
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} |
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|
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int |
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__peak_tz_period_compare(const void *v1, const void *v2) |
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{ |
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struct __peak_tz_period *tzp1 = (struct __peak_tz_period *)v1; |
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struct __peak_tz_period *tzp2 = (struct __peak_tz_period *)v2; |
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|
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if (tzp1->start < tzp2->start) |
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return -1; |
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else |
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return (tzp1->start == tzp2->start) ? 0 : 1; |
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} |
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|
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peak_tz |
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peak_tz_create(const char *tz_name) |
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{ |
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char path_buf[MAXPATHLEN+1]; |
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void *data_buf; |
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long data_len; |
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const char *name = NULL; |
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peak_dict abbrevs; |
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|
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if (!tz_name) |
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return NULL; |
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|
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if (*tz_name != '/') |
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{ |
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abbrevs = peak_dict_create(&peak_dict_string_key_ops, |
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&peak_dict_string_value_ops, |
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abbrev2name, |
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NUM_ABBREV); |
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|
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if (abbrevs) |
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{ |
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name = (const char *)peak_dict_get_value(abbrevs, tz_name); |
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peak_release(abbrevs); |
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} |
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if (!name) |
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name = tz_name; |
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snprintf(path_buf, sizeof(path_buf), "%s/%s", TZDIR, name); |
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} |
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else |
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{ |
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char *p; |
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|
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strncpy(path_buf, tz_name, sizeof(path_buf) - 1); |
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path_buf[sizeof(path_buf) - 1] = '\0'; |
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name = ((p = strrchr(path_buf, '/'))) ? p + 1 : path_buf; |
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} |
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|
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if (!peak_read_file(path_buf, &data_buf, &data_len)) |
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return NULL; |
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|
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return PEAK_CLASS_CONSTRUCT3(tz, name, data_buf, data_len); |
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} |
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|
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static void |
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__peak_tz_init(peak_tz tz, va_list vp, void *ctcx) |
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{ |
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long len; |
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int i; |
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int32_t timecnt, typecnt, charcnt, cnt, start, offset; |
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const char *p, *timep, *typep, *ttypp, *charp; |
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char **abbrs; |
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uint8_t type, dst, idx; |
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struct __peak_tz_period *tzp; |
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int result = 1; |
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|
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tz->_name = peak_strdup(va_arg(vp, const char *)); |
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p = va_arg(vp, void*); |
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len = va_arg(vp, long); |
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|
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if (len < (int)sizeof(struct tzhead)) |
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PEAK_CT_RAISE("failed to read zone info: truncated tzhead", 0); |
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|
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p += 24 + 4 + 4; /* reserved, ttisstdcnt, leapcnt */ |
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|
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timecnt = __peak_tz_detzcode(p); |
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p += 4; |
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typecnt = __peak_tz_detzcode(p); |
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p += 4; |
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charcnt = __peak_tz_detzcode(p); |
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p += 4; |
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if ((typecnt <= 0 || timecnt < 0 || charcnt < 0) |
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|| (len - sizeof(struct tzhead) < (4 + 1) * timecnt |
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+ (4 + 1 + 1) * typecnt |
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+ charcnt)) |
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PEAK_CT_RAISE("failed to read zone info: bad tzhead values", 0); |
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|
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assert(typecnt > 0); |
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|
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timep = p; /* coded transition times a la time(2) */ |
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typep = p + 4 * timecnt; /* types of local time starting at above */ |
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ttypp = typep + timecnt; /* local time types */ |
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charp = ttypp + 6 * typecnt; /* 0-terminated zone abbreviations */ |
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cnt = (0 < timecnt) ? timecnt : 1; |
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tzp = peak_allocate(cnt * sizeof(struct __peak_tz_period)); |
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memset(tzp, 0, sizeof(cnt * sizeof(struct __peak_tz_period))); |
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#ifdef HAVE_ALLOCA |
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abbrs = (char **)alloca((charcnt + 1) * sizeof(char *)); |
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#else |
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abbrs = (char **)peak_allocate((charcnt + 1) * sizeof(char *)); |
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#endif |
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for (i = charcnt; i--; ) |
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abbrs[i] = NULL; |
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|
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for (i = 0; i < cnt; i++) |
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{ |
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if (0 == timecnt) |
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start = INT_MIN; |
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else |
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{ |
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start = __peak_tz_detzcode(timep); |
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timep += 4; |
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} |
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type = (0 < timecnt) ? (uint8_t)*typep++ : 0; |
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if (typecnt <= type) |
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{ |
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result = 0; |
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break; |
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} |
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offset = __peak_tz_detzcode(ttypp + 6 * type); |
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dst = (uint8_t)*(ttypp + 6 * type + 4); |
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if (dst != 0 && dst != 1) |
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{ |
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result = 0; |
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break; |
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} |
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idx = (uint8_t)*(ttypp + 6 * type + 5); |
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if (charcnt < idx) |
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{ |
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result = 0; |
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break; |
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} |
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if (!abbrs[idx]) |
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abbrs[idx] = (char *)(charp + idx); |
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|
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__peak_tz_period_init(tzp + i, start, abbrs[idx], offset, dst); |
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} |
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#ifndef HAVE_ALLOCA |
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peak_deallocate(abbrs); |
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#endif |
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if (!result) |
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{ |
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peak_deallocate(tzp); |
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PEAK_CT_RAISE("failed to read zone info: can't parse data", 0); |
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} |
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|
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/* cleanup */ |
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for (i = 0; i < cnt; i++) |
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{ |
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if ((tzp[i].start == INT_MIN) |
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&& (i + 1 < cnt) |
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&& (tzp[i + 1].start == INT_MIN)) |
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{ |
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cnt--; |
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memmove(&tzp[i], &tzp[i + 1], |
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sizeof(struct __peak_tz_period) * (cnt - i)); |
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i--; |
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} |
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} |
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for (i = 0; i < cnt; i++) |
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{ |
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if ((tzp[i].start == INT_MAX) |
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&& (0 < i) |
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&& (tzp[i - 1].start == INT_MAX)) |
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{ |
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cnt--; |
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memmove(&tzp[i], &tzp[i + 1], |
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sizeof(struct __peak_tz_period) * (cnt - i)); |
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i--; |
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} |
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} |
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qsort(tzp, cnt, sizeof(struct __peak_tz_period), __peak_tz_period_compare); |
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|
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tz->_periods = tzp; |
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tz->_period_cnt = cnt; |
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} |
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|
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static void |
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__peak_tz_finalize(peak_tz tz) |
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{ |
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/* XXX */ |
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if (tz->_periods) |
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peak_deallocate(tz->_periods); |
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|
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peak_deallocate((void*)tz->_name); |
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} |
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|
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peak_tz |
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peak_tz_create_system() |
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{ |
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char *tzenv; |
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peak_tz tz; |
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int res; |
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char *name; |
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char linkbuf[MAXPATHLEN+1]; |
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|
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tzenv = getenv("TZFILE"); |
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if (tzenv != NULL) |
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{ |
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tz = peak_tz_create(tzenv); |
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if (tz) |
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return tz; |
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} |
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|
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tzenv = getenv("TZ"); |
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if (tzenv != NULL) |
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{ |
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tz = peak_tz_create(tzenv); |
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if (tz) |
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return tz; |
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} |
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|
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if ((res = readlink(TZDEFAULT, linkbuf, sizeof(linkbuf) - 1)) > 0) |
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{ |
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linkbuf[res] = '\0'; |
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if (strncmp(linkbuf, TZDIR, sizeof(TZDIR) - 1) == 0) |
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{ |
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name = linkbuf + sizeof(TZDIR); |
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while (*name == '/') |
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name++; |
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} |
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else |
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name = linkbuf; |
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|
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if ((tz = peak_tz_create(name))) |
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return tz; |
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} |
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return peak_tz_create("GMT"); |
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} |
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|
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const char * |
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peak_tz_get_name(peak_tz tz) |
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{ |
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return tz->_name; |
| 401 |
} |
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|
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static struct __peak_tz_period * |
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__peak_tz_bsearch_period(peak_tz tz, time_t t) |
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{ |
| 406 |
struct __peak_tz_period *base = tz->_periods; |
| 407 |
struct __peak_tz_period *p; |
| 408 |
struct __peak_tz_period *result = NULL; |
| 409 |
size_t lim; |
| 410 |
|
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for (lim = tz->_period_cnt; lim; lim >>= 1) |
| 412 |
{ |
| 413 |
p = base + (lim >> 1); |
| 414 |
if (t >= p->start) /* key >= p: move right */ |
| 415 |
{ |
| 416 |
result = p; |
| 417 |
base = p + 1; |
| 418 |
lim--; |
| 419 |
} /* else move left */ |
| 420 |
} |
| 421 |
|
| 422 |
if (result == NULL) |
| 423 |
{ |
| 424 |
int i; |
| 425 |
|
| 426 |
#if 1 |
| 427 |
fprintf(stderr, "libpeak: __peak_tz_bsearch_period failed\n"); |
| 428 |
#endif |
| 429 |
for (i = 0; i < tz->_period_cnt && (tz->_periods[i].info & (1 << 31)); |
| 430 |
i++) |
| 431 |
; |
| 432 |
if (i < tz->_period_cnt) |
| 433 |
result = &tz->_periods[i]; |
| 434 |
else |
| 435 |
result = &tz->_periods[0]; |
| 436 |
} |
| 437 |
else |
| 438 |
{ |
| 439 |
if (result > tz->_periods) |
| 440 |
{ |
| 441 |
assert(result->start > (result - 1)->start); |
| 442 |
} |
| 443 |
if (result < (tz->_periods + tz->_period_cnt - 1)) |
| 444 |
{ |
| 445 |
assert(result->start < (result + 1)->start); |
| 446 |
} |
| 447 |
} |
| 448 |
return result; |
| 449 |
} |
| 450 |
|
| 451 |
const char * |
| 452 |
peak_tz_get_abbreviation(peak_tz tz, time_t t) |
| 453 |
{ |
| 454 |
struct __peak_tz_period *period; |
| 455 |
|
| 456 |
period = __peak_tz_bsearch_period(tz, t); |
| 457 |
assert(period != NULL); |
| 458 |
|
| 459 |
return period->abbrev; |
| 460 |
} |
| 461 |
|
| 462 |
time_t |
| 463 |
peak_tz_get_gmt_offset(peak_tz tz, time_t t) |
| 464 |
{ |
| 465 |
struct __peak_tz_period *period; |
| 466 |
time_t result; |
| 467 |
|
| 468 |
period = __peak_tz_bsearch_period(tz, t); |
| 469 |
assert(period != NULL); |
| 470 |
|
| 471 |
result = period->info & ~(3 << 30); |
| 472 |
if (period->info & (1 << 31)) |
| 473 |
result = -result; |
| 474 |
return result; |
| 475 |
} |
| 476 |
|
| 477 |
|
| 478 |
int |
| 479 |
peak_tz_is_dst(peak_tz tz, time_t t) |
| 480 |
{ |
| 481 |
struct __peak_tz_period *period; |
| 482 |
|
| 483 |
period = __peak_tz_bsearch_period(tz, t); |
| 484 |
assert(period != NULL); |
| 485 |
|
| 486 |
return (period->info & (1 << 30)); |
| 487 |
} |
| 488 |
|
| 489 |
|
