tzfile.h 4.9 KB

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  1. #ifndef TZFILE_H
  2. #define TZFILE_H
  3. /*
  4. ** This file is in the public domain, so clarified as of
  5. ** 1996-06-05 by Arthur David Olson.
  6. */
  7. /*
  8. ** This header is for use ONLY with the time conversion code.
  9. ** There is no guarantee that it will remain unchanged,
  10. ** or that it will remain at all.
  11. ** Do NOT copy it to any system include directory.
  12. ** Thank you!
  13. */
  14. /*
  15. ** ID
  16. */
  17. #ifndef lint
  18. #ifndef NOID
  19. static char tzfilehid[] = "@(#)tzfile.h 8.1";
  20. #endif /* !defined NOID */
  21. #endif /* !defined lint */
  22. /*
  23. ** Information about time zone files.
  24. */
  25. #ifndef TZDIR
  26. #define TZDIR "/usr/share/zoneinfo" /* "/android/usr/share/zoneinfo" */ /* Time zone object file directory */
  27. #endif /* !defined TZDIR */
  28. #ifndef TZDEFAULT
  29. #define TZDEFAULT "localtime"
  30. #endif /* !defined TZDEFAULT */
  31. #ifndef TZDEFRULES
  32. #define TZDEFRULES "posixrules"
  33. #endif /* !defined TZDEFRULES */
  34. /*
  35. ** Each file begins with. . .
  36. */
  37. #define TZ_MAGIC "TZif"
  38. struct tzhead {
  39. char tzh_magic[4]; /* TZ_MAGIC */
  40. char tzh_version[1]; /* '\0' or '2' as of 2005 */
  41. char tzh_reserved[15]; /* reserved--must be zero */
  42. char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */
  43. char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
  44. char tzh_leapcnt[4]; /* coded number of leap seconds */
  45. char tzh_timecnt[4]; /* coded number of transition times */
  46. char tzh_typecnt[4]; /* coded number of local time types */
  47. char tzh_charcnt[4]; /* coded number of abbr. chars */
  48. };
  49. /*
  50. ** . . .followed by. . .
  51. **
  52. ** tzh_timecnt (char [4])s coded transition times a la time(2)
  53. ** tzh_timecnt (unsigned char)s types of local time starting at above
  54. ** tzh_typecnt repetitions of
  55. ** one (char [4]) coded UTC offset in seconds
  56. ** one (unsigned char) used to set tm_isdst
  57. ** one (unsigned char) that's an abbreviation list index
  58. ** tzh_charcnt (char)s '\0'-terminated zone abbreviations
  59. ** tzh_leapcnt repetitions of
  60. ** one (char [4]) coded leap second transition times
  61. ** one (char [4]) total correction after above
  62. ** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition
  63. ** time is standard time, if FALSE,
  64. ** transition time is wall clock time
  65. ** if absent, transition times are
  66. ** assumed to be wall clock time
  67. ** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition
  68. ** time is UTC, if FALSE,
  69. ** transition time is local time
  70. ** if absent, transition times are
  71. ** assumed to be local time
  72. */
  73. /*
  74. ** If tzh_version is '2' or greater, the above is followed by a second instance
  75. ** of tzhead and a second instance of the data in which each coded transition
  76. ** time uses 8 rather than 4 chars,
  77. ** then a POSIX-TZ-environment-variable-style string for use in handling
  78. ** instants after the last transition time stored in the file
  79. ** (with nothing between the newlines if there is no POSIX representation for
  80. ** such instants).
  81. */
  82. /*
  83. ** In the current implementation, "tzset()" refuses to deal with files that
  84. ** exceed any of the limits below.
  85. */
  86. #ifndef TZ_MAX_TIMES
  87. #define TZ_MAX_TIMES 1200
  88. #endif /* !defined TZ_MAX_TIMES */
  89. #ifndef TZ_MAX_TYPES
  90. #ifndef NOSOLAR
  91. #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
  92. #endif /* !defined NOSOLAR */
  93. #ifdef NOSOLAR
  94. /*
  95. ** Must be at least 14 for Europe/Riga as of Jan 12 1995,
  96. ** as noted by Earl Chew.
  97. */
  98. #define TZ_MAX_TYPES 20 /* Maximum number of local time types */
  99. #endif /* !defined NOSOLAR */
  100. #endif /* !defined TZ_MAX_TYPES */
  101. #ifndef TZ_MAX_CHARS
  102. #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
  103. /* (limited by what unsigned chars can hold) */
  104. #endif /* !defined TZ_MAX_CHARS */
  105. #ifndef TZ_MAX_LEAPS
  106. #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
  107. #endif /* !defined TZ_MAX_LEAPS */
  108. #define SECSPERMIN 60
  109. #define MINSPERHOUR 60
  110. #define HOURSPERDAY 24
  111. #define DAYSPERWEEK 7
  112. #define DAYSPERNYEAR 365
  113. #define DAYSPERLYEAR 366
  114. #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
  115. #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
  116. #define MONSPERYEAR 12
  117. #define TM_SUNDAY 0
  118. #define TM_MONDAY 1
  119. #define TM_TUESDAY 2
  120. #define TM_WEDNESDAY 3
  121. #define TM_THURSDAY 4
  122. #define TM_FRIDAY 5
  123. #define TM_SATURDAY 6
  124. #define TM_JANUARY 0
  125. #define TM_FEBRUARY 1
  126. #define TM_MARCH 2
  127. #define TM_APRIL 3
  128. #define TM_MAY 4
  129. #define TM_JUNE 5
  130. #define TM_JULY 6
  131. #define TM_AUGUST 7
  132. #define TM_SEPTEMBER 8
  133. #define TM_OCTOBER 9
  134. #define TM_NOVEMBER 10
  135. #define TM_DECEMBER 11
  136. #define TM_YEAR_BASE 1900
  137. #define EPOCH_YEAR 1970
  138. #define EPOCH_WDAY TM_THURSDAY
  139. #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
  140. /*
  141. ** Since everything in isleap is modulo 400 (or a factor of 400), we know that
  142. ** isleap(y) == isleap(y % 400)
  143. ** and so
  144. ** isleap(a + b) == isleap((a + b) % 400)
  145. ** or
  146. ** isleap(a + b) == isleap(a % 400 + b % 400)
  147. ** This is true even if % means modulo rather than Fortran remainder
  148. ** (which is allowed by C89 but not C99).
  149. ** We use this to avoid addition overflow problems.
  150. */
  151. #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
  152. #endif /* !defined TZFILE_H */