6 ** This file is in the public domain, so clarified as of
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7 ** 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
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11 ** This header is for use ONLY with the time conversion code.
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12 ** There is no guarantee that it will remain unchanged,
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13 ** or that it will remain at all.
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14 ** Do NOT copy it to any system include directory.
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24 static char tzfilehid[] = "@(#)tzfile.h 7.14";
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25 #endif /* !defined NOID */
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26 #endif /* !defined lint */
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29 ** Information about time zone files.
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33 #define TZDIR "/usr/local/etc/zoneinfo" /* Time zone object file directory */
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34 #endif /* !defined TZDIR */
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37 #define TZDEFAULT "localtime"
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38 #endif /* !defined TZDEFAULT */
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41 #define TZDEFRULES "posixrules"
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42 #endif /* !defined TZDEFRULES */
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45 ** Each file begins with. . .
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48 #define TZ_MAGIC "TZif"
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51 char tzh_magic[4]; /* TZ_MAGIC */
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52 char tzh_reserved[16]; /* reserved for future use */
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53 char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */
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54 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
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55 char tzh_leapcnt[4]; /* coded number of leap seconds */
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56 char tzh_timecnt[4]; /* coded number of transition times */
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57 char tzh_typecnt[4]; /* coded number of local time types */
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58 char tzh_charcnt[4]; /* coded number of abbr. chars */
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62 ** . . .followed by. . .
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64 ** tzh_timecnt (char [4])s coded transition times a la time(2)
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65 ** tzh_timecnt (unsigned char)s types of local time starting at above
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66 ** tzh_typecnt repetitions of
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67 ** one (char [4]) coded UTC offset in seconds
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68 ** one (unsigned char) used to set tm_isdst
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69 ** one (unsigned char) that's an abbreviation list index
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70 ** tzh_charcnt (char)s '\0'-terminated zone abbreviations
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71 ** tzh_leapcnt repetitions of
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72 ** one (char [4]) coded leap second transition times
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73 ** one (char [4]) total correction after above
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74 ** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition
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75 ** time is standard time, if FALSE,
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76 ** transition time is wall clock time
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77 ** if absent, transition times are
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78 ** assumed to be wall clock time
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79 ** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition
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80 ** time is UTC, if FALSE,
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81 ** transition time is local time
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82 ** if absent, transition times are
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83 ** assumed to be local time
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87 ** In the current implementation, "tzset()" refuses to deal with files that
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88 ** exceed any of the limits below.
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91 #ifndef TZ_MAX_TIMES
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93 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a
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94 ** year's worth of solar time (corrected daily to the nearest second) or
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95 ** 138 years of Pacific Presidential Election time
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96 ** (where there are three time zone transitions every fourth year).
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98 #define TZ_MAX_TIMES 370
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99 #endif /* !defined TZ_MAX_TIMES */
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101 #ifndef TZ_MAX_TYPES
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103 #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
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104 #endif /* !defined NOSOLAR */
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107 ** Must be at least 14 for Europe/Riga as of Jan 12 1995,
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108 ** as noted by Earl Chew <earl@hpato.aus.hp.com>.
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110 #define TZ_MAX_TYPES 20 /* Maximum number of local time types */
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111 #endif /* !defined NOSOLAR */
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112 #endif /* !defined TZ_MAX_TYPES */
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114 #ifndef TZ_MAX_CHARS
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115 #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
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116 /* (limited by what unsigned chars can hold) */
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117 #endif /* !defined TZ_MAX_CHARS */
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119 #ifndef TZ_MAX_LEAPS
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120 #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
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121 #endif /* !defined TZ_MAX_LEAPS */
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123 #define SECSPERMIN 60
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124 #define MINSPERHOUR 60
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125 #define HOURSPERDAY 24
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126 #define DAYSPERWEEK 7
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127 #define DAYSPERNYEAR 365
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128 #define DAYSPERLYEAR 366
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129 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
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130 #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
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131 #define MONSPERYEAR 12
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133 #define TM_SUNDAY 0
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134 #define TM_MONDAY 1
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135 #define TM_TUESDAY 2
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136 #define TM_WEDNESDAY 3
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137 #define TM_THURSDAY 4
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138 #define TM_FRIDAY 5
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139 #define TM_SATURDAY 6
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141 #define TM_JANUARY 0
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142 #define TM_FEBRUARY 1
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148 #define TM_AUGUST 7
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149 #define TM_SEPTEMBER 8
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150 #define TM_OCTOBER 9
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151 #define TM_NOVEMBER 10
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152 #define TM_DECEMBER 11
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154 #define TM_YEAR_BASE 1900
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156 #define EPOCH_YEAR 1970
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157 #define EPOCH_WDAY TM_THURSDAY
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160 ** Accurate only for the past couple of centuries;
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161 ** that will probably do.
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164 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
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169 ** Use of the underscored variants may cause problems if you move your code to
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170 ** certain System-V-based systems; for maximum portability, use the
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171 ** underscore-free variants. The underscored variants are provided for
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172 ** backward compatibility only; they may disappear from future versions of
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176 #define SECS_PER_MIN SECSPERMIN
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177 #define MINS_PER_HOUR MINSPERHOUR
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178 #define HOURS_PER_DAY HOURSPERDAY
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179 #define DAYS_PER_WEEK DAYSPERWEEK
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180 #define DAYS_PER_NYEAR DAYSPERNYEAR
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181 #define DAYS_PER_LYEAR DAYSPERLYEAR
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182 #define SECS_PER_HOUR SECSPERHOUR
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183 #define SECS_PER_DAY SECSPERDAY
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184 #define MONS_PER_YEAR MONSPERYEAR
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186 #endif /* !defined USG */
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188 #endif /* !defined TZFILE_H */
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