1/*
2  timezone.h - Zip 3
3
4  Copyright (c) 1990-2004 Info-ZIP.  All rights reserved.
5
6  See the accompanying file LICENSE, version 2003-May-08 or later
7  (the contents of which are also included in zip.h) for terms of use.
8  If, for some reason, all these files are missing, the Info-ZIP license
9  also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.html
10*/
11#ifndef __timezone_h
12#define __timezone_h
13
14#ifndef IZ_MKTIME_ONLY
15
16/* limits for our timezone info data:
17 * we support only basic standard and daylight time, with max 2 transitions
18 * per year, but for the maximum range of years a 32-bit second counter
19 * can cover (these are 136 years plus a bit more than one month)
20 */
21#define TZ_MAX_TIMES    272 /* (=2*(LastGoodYr + 1 - FirstGoodYr) */
22#define TZ_MAX_TYPES    2   /* We only support basic standard and daylight */
23#ifdef WIN32    /* Win32 tzinfo supplies at max (2 * 32) chars of tz names */
24#define TZ_MAX_CHARS    64  /* Maximum number of abbreviation characters */
25#else
26#define TZ_MAX_CHARS    50  /* Maximum number of abbreviation characters */
27#endif
28
29/* supported types of transition rules */
30#define JULIAN_DAY              0   /* Jn - Julian day */
31#define DAY_OF_YEAR             1   /* n - day of year */
32#define MONTH_NTH_DAY_OF_WEEK   2   /* Mm.n.d - month, week, day of week */
33
34
35struct ttinfo {
36    long            tt_gmtoff;  /* UTC offset in seconds */
37    int             tt_isdst;   /* used to set tm_isdst */
38    int             tt_abbrind; /* abbreviation list index */
39};
40
41struct state {
42    int             timecnt;
43    int             typecnt;
44    int             charcnt;
45    time_t          ats[TZ_MAX_TIMES];
46    unsigned char   types[TZ_MAX_TIMES];
47    struct ttinfo   ttis[TZ_MAX_TYPES];
48    char            chars[TZ_MAX_CHARS];
49};
50
51struct rule {
52    int             r_type;     /* type of rule--JULIAN_DAY etc */
53    int             r_day;      /* day number of rule */
54    int             r_week;     /* week number of rule */
55    int             r_mon;      /* month number of rule */
56    long            r_time;     /* transition time of rule */
57};
58
59extern int real_timezone_is_set;        /* set by tzset() */
60
61
62/* prototypes of functions not in time.h */
63
64void __tzset OF((void));
65
66#ifdef NEED__ISINDST
67int _isindst OF((struct tm *tb));
68#endif
69
70/* callback function to be supplied by the program that uses this library */
71int GetPlatformLocalTimezone OF((register struct state * ZCONST sp,
72        void (*fill_tzstate_from_rules)(struct state * ZCONST sp_res,
73                                        ZCONST struct rule * ZCONST start,
74                                        ZCONST struct rule * ZCONST end)));
75#ifdef IZTZ_SETLOCALTZINFO
76void set_TZ OF((long time_zone, int day_light));
77#endif
78
79#endif /* !IZ_MKTIME_ONLY */
80
81time_t mkgmtime OF((struct tm *tm));
82
83#endif
84