1 /* 2 * Copyright (c) 1988 Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Arthur Olson. 7 * 8 * Redistribution and use in source and binary forms are permitted 9 * provided that the above copyright notice and this paragraph are 10 * duplicated in all such forms and that any documentation, 11 * advertising materials, and other materials related to such 12 * distribution and use acknowledge that the software was developed 13 * by the University of California, Berkeley. The name of the 14 * University may not be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19 * 20 * @(#)tzfile.h 5.3 (Berkeley) 07/06/88 21 */ 22 23 /* 24 ** Information about time zone files. 25 */ 26 27 #define TZDIR "/etc/zoneinfo" /* Time zone object file directory */ 28 #define TZDEFAULT "localtime" 29 30 /* 31 ** Each file begins with. . . 32 */ 33 34 struct tzhead { 35 char tzh_reserved[32]; /* reserved for future use */ 36 char tzh_timecnt[4]; /* coded number of transition times */ 37 char tzh_typecnt[4]; /* coded number of local time types */ 38 char tzh_charcnt[4]; /* coded number of abbr. chars */ 39 }; 40 41 /* 42 ** . . .followed by. . . 43 ** 44 ** tzh_timecnt (char [4])s coded transition times a la time(2) 45 ** tzh_timecnt (unsigned char)s types of local time starting at above 46 ** tzh_typecnt repetitions of 47 ** one (char [4]) coded GMT offset in seconds 48 ** one (unsigned char) used to set tm_isdt 49 ** one (unsigned char) that's an abbreviation list index 50 ** tzh_charcnt (char)s '\0'-terminated zone abbreviaton strings 51 */ 52 53 /* 54 ** In the current implementation, "tzset()" refuses to deal with files that 55 ** exceed any of the limits below. 56 */ 57 58 /* 59 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a 60 ** year's worth of solar time (corrected daily to the nearest second) or 61 ** 138 years of Pacific Presidential Election time 62 ** (where there are three time zone transitions every fourth year). 63 */ 64 #define TZ_MAX_TIMES 370 65 66 #define NOSOLAR /* We currently don't handle solar time */ 67 68 #ifndef NOSOLAR 69 #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ 70 #else /* !NOSOLAR */ 71 #define TZ_MAX_TYPES 10 /* Maximum number of local time types */ 72 #endif /* !NOSOLAR */ 73 74 #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ 75 76 #define SECS_PER_MIN 60 77 #define MINS_PER_HOUR 60 78 #define HOURS_PER_DAY 24 79 #define DAYS_PER_WEEK 7 80 #define DAYS_PER_NYEAR 365 81 #define DAYS_PER_LYEAR 366 82 #define SECS_PER_HOUR (SECS_PER_MIN * MINS_PER_HOUR) 83 #define SECS_PER_DAY ((long) SECS_PER_HOUR * HOURS_PER_DAY) 84 #define MONS_PER_YEAR 12 85 86 #define TM_SUNDAY 0 87 #define TM_MONDAY 1 88 #define TM_TUESDAY 2 89 #define TM_WEDNESDAY 3 90 #define TM_THURSDAY 4 91 #define TM_FRIDAY 5 92 #define TM_SATURDAY 6 93 94 #define TM_JANUARY 0 95 #define TM_FEBRUARY 1 96 #define TM_MARCH 2 97 #define TM_APRIL 3 98 #define TM_MAY 4 99 #define TM_JUNE 5 100 #define TM_JULY 6 101 #define TM_AUGUST 7 102 #define TM_SEPTEMBER 8 103 #define TM_OCTOBER 9 104 #define TM_NOVEMBER 10 105 #define TM_DECEMBER 11 106 #define TM_SUNDAY 0 107 108 #define TM_YEAR_BASE 1900 109 110 #define EPOCH_YEAR 1970 111 #define EPOCH_WDAY TM_THURSDAY 112 113 /* 114 ** Accurate only for the past couple of centuries; 115 ** that will probably do. 116 */ 117 118 #define isleap(y) (((y) % 4) == 0 && ((y) % 100) != 0 || ((y) % 400) == 0) 119