timezone/private.h

   1 /* Private header for tzdb code.  */
   2
   3 #ifndef PRIVATE_H
   4
   5 #define PRIVATE_H
   6
   7 /*
   8 ** This file is in the public domain, so clarified as of
   9 ** 1996-06-05 by Arthur David Olson.
  10 */
  11
  12 /*
  13 ** This header is for use ONLY with the time conversion code.
  14 ** There is no guarantee that it will remain unchanged,
  15 ** or that it will remain at all.
  16 ** Do NOT copy it to any system include directory.
  17 ** Thank you!
  18 */
  19
  20 /*
  21 ** zdump has been made independent of the rest of the time
  22 ** conversion package to increase confidence in the verification it provides.
  23 ** You can use zdump to help in verifying other implementations.
  24 ** To do this, compile with -DUSE_LTZ=0 and link without the tz library.
  25 */
  26 #ifndef USE_LTZ
  27 # define USE_LTZ 1
  28 #endif
  29
  30 /* This string was in the Factory zone through version 2016f.  */
  31 #define GRANDPARENTED   "Local time zone must be set--see zic manual page"
  32
  33 /*
  34 ** Defaults for preprocessor symbols.
  35 ** You can override these in your C compiler options, e.g. '-DHAVE_GETTEXT=1'.
  36 */
  37
  38 #ifndef HAVE_DECL_ASCTIME_R
  39 #define HAVE_DECL_ASCTIME_R 1
  40 #endif
  41
  42 #if !defined HAVE_GENERIC && defined __has_extension
  43 # if __has_extension(c_generic_selections)
  44 #  define HAVE_GENERIC 1
  45 # else
  46 #  define HAVE_GENERIC 0
  47 # endif
  48 #endif
  49 /* _Generic is buggy in pre-4.9 GCC.  */
  50 #if !defined HAVE_GENERIC && defined __GNUC__
  51 # define HAVE_GENERIC (4 < __GNUC__ + (9 <= __GNUC_MINOR__))
  52 #endif
  53 #ifndef HAVE_GENERIC
  54 # define HAVE_GENERIC (201112 <= __STDC_VERSION__)
  55 #endif
  56
  57 #ifndef HAVE_GETTEXT
  58 #define HAVE_GETTEXT            0
  59 #endif /* !defined HAVE_GETTEXT */
  60
  61 #ifndef HAVE_INCOMPATIBLE_CTIME_R
  62 #define HAVE_INCOMPATIBLE_CTIME_R       0
  63 #endif
  64
  65 #ifndef HAVE_LINK
  66 #define HAVE_LINK               1
  67 #endif /* !defined HAVE_LINK */
  68
  69 #ifndef HAVE_POSIX_DECLS
  70 #define HAVE_POSIX_DECLS 1
  71 #endif
  72
  73 #ifndef HAVE_STDBOOL_H
  74 #define HAVE_STDBOOL_H (199901 <= __STDC_VERSION__)
  75 #endif
  76
  77 #ifndef HAVE_STRDUP
  78 #define HAVE_STRDUP 1
  79 #endif
  80
  81 #ifndef HAVE_STRTOLL
  82 #define HAVE_STRTOLL 1
  83 #endif
  84
  85 #ifndef HAVE_SYMLINK
  86 #define HAVE_SYMLINK            1
  87 #endif /* !defined HAVE_SYMLINK */
  88
  89 #ifndef HAVE_SYS_STAT_H
  90 #define HAVE_SYS_STAT_H         1
  91 #endif /* !defined HAVE_SYS_STAT_H */
  92
  93 #ifndef HAVE_SYS_WAIT_H
  94 #define HAVE_SYS_WAIT_H         1
  95 #endif /* !defined HAVE_SYS_WAIT_H */
  96
  97 #ifndef HAVE_UNISTD_H
  98 #define HAVE_UNISTD_H           1
  99 #endif /* !defined HAVE_UNISTD_H */
 100
 101 #ifndef HAVE_UTMPX_H
 102 #define HAVE_UTMPX_H            1
 103 #endif /* !defined HAVE_UTMPX_H */
 104
 105 #ifndef NETBSD_INSPIRED
 106 # define NETBSD_INSPIRED 1
 107 #endif
 108
 109 #if HAVE_INCOMPATIBLE_CTIME_R
 110 #define asctime_r _incompatible_asctime_r
 111 #define ctime_r _incompatible_ctime_r
 112 #endif /* HAVE_INCOMPATIBLE_CTIME_R */
 113
 114 /* Enable tm_gmtoff, tm_zone, and environ on GNUish systems.  */
 115 #define _GNU_SOURCE 1
 116 /* Fix asctime_r on Solaris 11.  */
 117 #define _POSIX_PTHREAD_SEMANTICS 1
 118 /* Enable strtoimax on pre-C99 Solaris 11.  */
 119 #define __EXTENSIONS__ 1
 120
 121 /* To avoid having 'stat' fail unnecessarily with errno == EOVERFLOW,
 122    enable large files on GNUish systems ...  */
 123 #ifndef _FILE_OFFSET_BITS
 124 # define _FILE_OFFSET_BITS 64
 125 #endif
 126 /* ... and on AIX ...  */
 127 #define _LARGE_FILES 1
 128 /* ... and enable large inode numbers on Mac OS X 10.5 and later.  */
 129 #define _DARWIN_USE_64_BIT_INODE 1
 130
 131 /*
 132 ** Nested includes
 133 */
 134
 135 /* Avoid clashes with NetBSD by renaming NetBSD's declarations.  */
 136 #define localtime_rz sys_localtime_rz
 137 #define mktime_z sys_mktime_z
 138 #define posix2time_z sys_posix2time_z
 139 #define time2posix_z sys_time2posix_z
 140 #define timezone_t sys_timezone_t
 141 #define tzalloc sys_tzalloc
 142 #define tzfree sys_tzfree
 143 #include <time.h>
 144 #undef localtime_rz
 145 #undef mktime_z
 146 #undef posix2time_z
 147 #undef time2posix_z
 148 #undef timezone_t
 149 #undef tzalloc
 150 #undef tzfree
 151
 152 #include <sys/types.h>  /* for time_t */
 153 #include <string.h>
 154 #include <limits.h>     /* for CHAR_BIT et al. */
 155 #include <stdlib.h>
 156
 157 #include <errno.h>
 158
 159 #ifndef ENAMETOOLONG
 160 # define ENAMETOOLONG EINVAL
 161 #endif
 162 #ifndef ENOTSUP
 163 # define ENOTSUP EINVAL
 164 #endif
 165 #ifndef EOVERFLOW
 166 # define EOVERFLOW EINVAL
 167 #endif
 168
 169 #if HAVE_GETTEXT
 170 #include <libintl.h>
 171 #endif /* HAVE_GETTEXT */
 172
 173 #if HAVE_UNISTD_H
 174 #include <unistd.h>     /* for R_OK, and other POSIX goodness */
 175 #endif /* HAVE_UNISTD_H */
 176
 177 #ifndef HAVE_STRFTIME_L
 178 # if _POSIX_VERSION < 200809
 179 #  define HAVE_STRFTIME_L 0
 180 # else
 181 #  define HAVE_STRFTIME_L 1
 182 # endif
 183 #endif
 184
 185 #ifndef USG_COMPAT
 186 # ifndef _XOPEN_VERSION
 187 #  define USG_COMPAT 0
 188 # else
 189 #  define USG_COMPAT 1
 190 # endif
 191 #endif
 192
 193 #ifndef HAVE_TZNAME
 194 # if _POSIX_VERSION < 198808 && !USG_COMPAT
 195 #  define HAVE_TZNAME 0
 196 # else
 197 #  define HAVE_TZNAME 1
 198 # endif
 199 #endif
 200
 201 #ifndef R_OK
 202 #define R_OK    4
 203 #endif /* !defined R_OK */
 204
 205 /* Unlike <ctype.h>'s isdigit, this also works if c < 0 | c > UCHAR_MAX. */
 206 #define is_digit(c) ((unsigned)(c) - '0' <= 9)
 207
 208 /*
 209 ** Define HAVE_STDINT_H's default value here, rather than at the
 210 ** start, since __GLIBC__ and INTMAX_MAX's values depend on
 211 ** previously-included files.  glibc 2.1 and Solaris 10 and later have
 212 ** stdint.h, even with pre-C99 compilers.
 213 */
 214 #ifndef HAVE_STDINT_H
 215 #define HAVE_STDINT_H \
 216    (199901 <= __STDC_VERSION__ \
 217     || 2 < __GLIBC__ + (1 <= __GLIBC_MINOR__)   \
 218     || __CYGWIN__ || INTMAX_MAX)
 219 #endif /* !defined HAVE_STDINT_H */
 220
 221 #if HAVE_STDINT_H
 222 #include <stdint.h>
 223 #endif /* !HAVE_STDINT_H */
 224
 225 #ifndef HAVE_INTTYPES_H
 226 # define HAVE_INTTYPES_H HAVE_STDINT_H
 227 #endif
 228 #if HAVE_INTTYPES_H
 229 # include <inttypes.h>
 230 #endif
 231
 232 /* Pre-C99 GCC compilers define __LONG_LONG_MAX__ instead of LLONG_MAX.  */
 233 #ifdef __LONG_LONG_MAX__
 234 # ifndef LLONG_MAX
 235 #  define LLONG_MAX __LONG_LONG_MAX__
 236 # endif
 237 # ifndef LLONG_MIN
 238 #  define LLONG_MIN (-1 - LLONG_MAX)
 239 # endif
 240 #endif
 241
 242 #ifndef INT_FAST64_MAX
 243 # ifdef LLONG_MAX
 244 typedef long long       int_fast64_t;
 245 #  define INT_FAST64_MIN LLONG_MIN
 246 #  define INT_FAST64_MAX LLONG_MAX
 247 # else
 248 #  if LONG_MAX >> 31 < 0xffffffff
 249 Please use a compiler that supports a 64-bit integer type (or wider);
 250 you may need to compile with "-DHAVE_STDINT_H".
 251 #  endif
 252 typedef long            int_fast64_t;
 253 #  define INT_FAST64_MIN LONG_MIN
 254 #  define INT_FAST64_MAX LONG_MAX
 255 # endif
 256 #endif
 257
 258 #ifndef PRIdFAST64
 259 # if INT_FAST64_MAX == LLONG_MAX
 260 #  define PRIdFAST64 "lld"
 261 # else
 262 #  define PRIdFAST64 "ld"
 263 # endif
 264 #endif
 265
 266 #ifndef SCNdFAST64
 267 # define SCNdFAST64 PRIdFAST64
 268 #endif
 269
 270 #ifndef INT_FAST32_MAX
 271 # if INT_MAX >> 31 == 0
 272 typedef long int_fast32_t;
 273 #  define INT_FAST32_MAX LONG_MAX
 274 #  define INT_FAST32_MIN LONG_MIN
 275 # else
 276 typedef int int_fast32_t;
 277 #  define INT_FAST32_MAX INT_MAX
 278 #  define INT_FAST32_MIN INT_MIN
 279 # endif
 280 #endif
 281
 282 #ifndef INTMAX_MAX
 283 # ifdef LLONG_MAX
 284 typedef long long intmax_t;
 285 #  if HAVE_STRTOLL
 286 #   define strtoimax strtoll
 287 #  endif
 288 #  define INTMAX_MAX LLONG_MAX
 289 #  define INTMAX_MIN LLONG_MIN
 290 # else
 291 typedef long intmax_t;
 292 #  define INTMAX_MAX LONG_MAX
 293 #  define INTMAX_MIN LONG_MIN
 294 # endif
 295 # ifndef strtoimax
 296 #  define strtoimax strtol
 297 # endif
 298 #endif
 299
 300 #ifndef PRIdMAX
 301 # if INTMAX_MAX == LLONG_MAX
 302 #  define PRIdMAX "lld"
 303 # else
 304 #  define PRIdMAX "ld"
 305 # endif
 306 #endif
 307
 308 #ifndef UINT_FAST64_MAX
 309 # if defined ULLONG_MAX || defined __LONG_LONG_MAX__
 310 typedef unsigned long long uint_fast64_t;
 311 # else
 312 #  if ULONG_MAX >> 31 >> 1 < 0xffffffff
 313 Please use a compiler that supports a 64-bit integer type (or wider);
 314 you may need to compile with "-DHAVE_STDINT_H".
 315 #  endif
 316 typedef unsigned long   uint_fast64_t;
 317 # endif
 318 #endif
 319
 320 #ifndef UINTMAX_MAX
 321 # if defined ULLONG_MAX || defined __LONG_LONG_MAX__
 322 typedef unsigned long long uintmax_t;
 323 # else
 324 typedef unsigned long uintmax_t;
 325 # endif
 326 #endif
 327
 328 #ifndef PRIuMAX
 329 # if defined ULLONG_MAX || defined __LONG_LONG_MAX__
 330 #  define PRIuMAX "llu"
 331 # else
 332 #  define PRIuMAX "lu"
 333 # endif
 334 #endif
 335
 336 #ifndef INT32_MAX
 337 #define INT32_MAX 0x7fffffff
 338 #endif /* !defined INT32_MAX */
 339 #ifndef INT32_MIN
 340 #define INT32_MIN (-1 - INT32_MAX)
 341 #endif /* !defined INT32_MIN */
 342
 343 #ifndef SIZE_MAX
 344 #define SIZE_MAX ((size_t) -1)
 345 #endif
 346
 347 #if 3 <= __GNUC__
 348 # define ATTRIBUTE_CONST __attribute__ ((const))
 349 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
 350 # define ATTRIBUTE_PURE __attribute__ ((__pure__))
 351 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 352 #else
 353 # define ATTRIBUTE_CONST /* empty */
 354 # define ATTRIBUTE_MALLOC /* empty */
 355 # define ATTRIBUTE_PURE /* empty */
 356 # define ATTRIBUTE_FORMAT(spec) /* empty */
 357 #endif
 358
 359 #if !defined _Noreturn && __STDC_VERSION__ < 201112
 360 # if 2 < __GNUC__ + (8 <= __GNUC_MINOR__)
 361 #  define _Noreturn __attribute__ ((__noreturn__))
 362 # else
 363 #  define _Noreturn
 364 # endif
 365 #endif
 366
 367 #if __STDC_VERSION__ < 199901 && !defined restrict
 368 # define restrict /* empty */
 369 #endif
 370
 371 /*
 372 ** Workarounds for compilers/systems.
 373 */
 374
 375 #ifndef EPOCH_LOCAL
 376 # define EPOCH_LOCAL 0
 377 #endif
 378 #ifndef EPOCH_OFFSET
 379 # define EPOCH_OFFSET 0
 380 #endif
 381 #ifndef RESERVE_STD_EXT_IDS
 382 # define RESERVE_STD_EXT_IDS 0
 383 #endif
 384
 385 /* If standard C identifiers with external linkage (e.g., localtime)
 386    are reserved and are not already being renamed anyway, rename them
 387    as if compiling with '-Dtime_tz=time_t'.  */
 388 #if !defined time_tz && RESERVE_STD_EXT_IDS && USE_LTZ
 389 # define time_tz time_t
 390 #endif
 391
 392 /*
 393 ** Compile with -Dtime_tz=T to build the tz package with a private
 394 ** time_t type equivalent to T rather than the system-supplied time_t.
 395 ** This debugging feature can test unusual design decisions
 396 ** (e.g., time_t wider than 'long', or unsigned time_t) even on
 397 ** typical platforms.
 398 */
 399 #if defined time_tz || EPOCH_LOCAL || EPOCH_OFFSET != 0
 400 # define TZ_TIME_T 1
 401 #else
 402 # define TZ_TIME_T 0
 403 #endif
 404
 405 #if TZ_TIME_T
 406 # ifdef LOCALTIME_IMPLEMENTATION
 407 static time_t sys_time(time_t *x) { return time(x); }
 408 # endif
 409
 410 typedef time_tz tz_time_t;
 411
 412 # undef  ctime
 413 # define ctime tz_ctime
 414 # undef  ctime_r
 415 # define ctime_r tz_ctime_r
 416 # undef  difftime
 417 # define difftime tz_difftime
 418 # undef  gmtime
 419 # define gmtime tz_gmtime
 420 # undef  gmtime_r
 421 # define gmtime_r tz_gmtime_r
 422 # undef  localtime
 423 # define localtime tz_localtime
 424 # undef  localtime_r
 425 # define localtime_r tz_localtime_r
 426 # undef  localtime_rz
 427 # define localtime_rz tz_localtime_rz
 428 # undef  mktime
 429 # define mktime tz_mktime
 430 # undef  mktime_z
 431 # define mktime_z tz_mktime_z
 432 # undef  offtime
 433 # define offtime tz_offtime
 434 # undef  posix2time
 435 # define posix2time tz_posix2time
 436 # undef  posix2time_z
 437 # define posix2time_z tz_posix2time_z
 438 # undef  strftime
 439 # define strftime tz_strftime
 440 # undef  time
 441 # define time tz_time
 442 # undef  time2posix
 443 # define time2posix tz_time2posix
 444 # undef  time2posix_z
 445 # define time2posix_z tz_time2posix_z
 446 # undef  time_t
 447 # define time_t tz_time_t
 448 # undef  timegm
 449 # define timegm tz_timegm
 450 # undef  timelocal
 451 # define timelocal tz_timelocal
 452 # undef  timeoff
 453 # define timeoff tz_timeoff
 454 # undef  tzalloc
 455 # define tzalloc tz_tzalloc
 456 # undef  tzfree
 457 # define tzfree tz_tzfree
 458 # undef  tzset
 459 # define tzset tz_tzset
 460 # undef  tzsetwall
 461 # define tzsetwall tz_tzsetwall
 462 # if HAVE_STRFTIME_L
 463 #  undef  strftime_l
 464 #  define strftime_l tz_strftime_l
 465 # endif
 466 # if HAVE_TZNAME
 467 #  undef  tzname
 468 #  define tzname tz_tzname
 469 # endif
 470 # if USG_COMPAT
 471 #  undef  daylight
 472 #  define daylight tz_daylight
 473 #  undef  timezone
 474 #  define timezone tz_timezone
 475 # endif
 476 # ifdef ALTZONE
 477 #  undef  altzone
 478 #  define altzone tz_altzone
 479 # endif
 480
 481 char *ctime(time_t const *);
 482 char *ctime_r(time_t const *, char *);
 483 double difftime(time_t, time_t) ATTRIBUTE_CONST;
 484 size_t strftime(char *restrict, size_t, char const *restrict,
 485                 struct tm const *restrict);
 486 # if HAVE_STRFTIME_L
 487 size_t strftime_l(char *restrict, size_t, char const *restrict,
 488                   struct tm const *restrict, locale_t);
 489 # endif
 490 struct tm *gmtime(time_t const *);
 491 struct tm *gmtime_r(time_t const *restrict, struct tm *restrict);
 492 struct tm *localtime(time_t const *);
 493 struct tm *localtime_r(time_t const *restrict, struct tm *restrict);
 494 time_t mktime(struct tm *);
 495 time_t time(time_t *);
 496 void tzset(void);
 497 #endif
 498
 499 #if !HAVE_DECL_ASCTIME_R && !defined asctime_r
 500 extern char *asctime_r(struct tm const *restrict, char *restrict);
 501 #endif
 502
 503 #ifndef HAVE_DECL_ENVIRON
 504 # if defined environ || defined __USE_GNU
 505 #  define HAVE_DECL_ENVIRON 1
 506 # else
 507 #  define HAVE_DECL_ENVIRON 0
 508 # endif
 509 #endif
 510
 511 #if !HAVE_DECL_ENVIRON
 512 extern char **environ;
 513 #endif
 514
 515 #if TZ_TIME_T || !HAVE_POSIX_DECLS
 516 # if HAVE_TZNAME
 517 extern char *tzname[];
 518 # endif
 519 # if USG_COMPAT
 520 extern long timezone;
 521 extern int daylight;
 522 # endif
 523 #endif
 524
 525 #ifdef ALTZONE
 526 extern long altzone;
 527 #endif
 528
 529 /*
 530 ** The STD_INSPIRED functions are similar, but most also need
 531 ** declarations if time_tz is defined.
 532 */
 533
 534 #ifdef STD_INSPIRED
 535 # if TZ_TIME_T || !defined tzsetwall
 536 void tzsetwall(void);
 537 # endif
 538 # if TZ_TIME_T || !defined offtime
 539 struct tm *offtime(time_t const *, long);
 540 # endif
 541 # if TZ_TIME_T || !defined timegm
 542 time_t timegm(struct tm *);
 543 # endif
 544 # if TZ_TIME_T || !defined timelocal
 545 time_t timelocal(struct tm *);
 546 # endif
 547 # if TZ_TIME_T || !defined timeoff
 548 time_t timeoff(struct tm *, long);
 549 # endif
 550 # if TZ_TIME_T || !defined time2posix
 551 time_t time2posix(time_t);
 552 # endif
 553 # if TZ_TIME_T || !defined posix2time
 554 time_t posix2time(time_t);
 555 # endif
 556 #endif
 557
 558 /* Infer TM_ZONE on systems where this information is known, but suppress
 559    guessing if NO_TM_ZONE is defined.  Similarly for TM_GMTOFF.  */
 560 #if (defined __GLIBC__ \
 561      || defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ \
 562      || (defined __APPLE__ && defined __MACH__))
 563 # if !defined TM_GMTOFF && !defined NO_TM_GMTOFF
 564 #  define TM_GMTOFF tm_gmtoff
 565 # endif
 566 # if !defined TM_ZONE && !defined NO_TM_ZONE
 567 #  define TM_ZONE tm_zone
 568 # endif
 569 #endif
 570
 571 /*
 572 ** Define functions that are ABI compatible with NetBSD but have
 573 ** better prototypes.  NetBSD 6.1.4 defines a pointer type timezone_t
 574 ** and labors under the misconception that 'const timezone_t' is a
 575 ** pointer to a constant.  This use of 'const' is ineffective, so it
 576 ** is not done here.  What we call 'struct state' NetBSD calls
 577 ** 'struct __state', but this is a private name so it doesn't matter.
 578 */
 579 #if NETBSD_INSPIRED
 580 typedef struct state *timezone_t;
 581 struct tm *localtime_rz(timezone_t restrict, time_t const *restrict,
 582                         struct tm *restrict);
 583 time_t mktime_z(timezone_t restrict, struct tm *restrict);
 584 timezone_t tzalloc(char const *);
 585 void tzfree(timezone_t);
 586 # ifdef STD_INSPIRED
 587 #  if TZ_TIME_T || !defined posix2time_z
 588 time_t posix2time_z(timezone_t, time_t) ATTRIBUTE_PURE;
 589 #  endif
 590 #  if TZ_TIME_T || !defined time2posix_z
 591 time_t time2posix_z(timezone_t, time_t) ATTRIBUTE_PURE;
 592 #  endif
 593 # endif
 594 #endif
 595
 596 /*
 597 ** Finally, some convenience items.
 598 */
 599
 600 #if HAVE_STDBOOL_H
 601 # include <stdbool.h>
 602 #else
 603 # define true 1
 604 # define false 0
 605 # define bool int
 606 #endif
 607
 608 #define TYPE_BIT(type)  (sizeof (type) * CHAR_BIT)
 609 #define TYPE_SIGNED(type) (((type) -1) < 0)
 610 #define TWOS_COMPLEMENT(t) ((t) ~ (t) 0 < 0)
 611
 612 /* Max and min values of the integer type T, of which only the bottom
 613    B bits are used, and where the highest-order used bit is considered
 614    to be a sign bit if T is signed.  */
 615 #define MAXVAL(t, b)                                            \
 616   ((t) (((t) 1 << ((b) - 1 - TYPE_SIGNED(t)))                   \
 617         - 1 + ((t) 1 << ((b) - 1 - TYPE_SIGNED(t)))))
 618 #define MINVAL(t, b)                                            \
 619   ((t) (TYPE_SIGNED(t) ? - TWOS_COMPLEMENT(t) - MAXVAL(t, b) : 0))
 620
 621 /* The extreme time values, assuming no padding.  */
 622 #define TIME_T_MIN_NO_PADDING MINVAL(time_t, TYPE_BIT(time_t))
 623 #define TIME_T_MAX_NO_PADDING MAXVAL(time_t, TYPE_BIT(time_t))
 624
 625 /* The extreme time values.  These are macros, not constants, so that
 626    any portability problem occur only when compiling .c files that use
 627    the macros, which is safer for applications that need only zdump and zic.
 628    This implementation assumes no padding if time_t is signed and
 629    either the compiler lacks support for _Generic or time_t is not one
 630    of the standard signed integer types.  */
 631 #if HAVE_GENERIC
 632 # define TIME_T_MIN \
 633     _Generic((time_t) 0, \
 634              signed char: SCHAR_MIN, short: SHRT_MIN, \
 635              int: INT_MIN, long: LONG_MIN, long long: LLONG_MIN, \
 636              default: TIME_T_MIN_NO_PADDING)
 637 # define TIME_T_MAX \
 638     (TYPE_SIGNED(time_t) \
 639      ? _Generic((time_t) 0, \
 640                 signed char: SCHAR_MAX, short: SHRT_MAX, \
 641                 int: INT_MAX, long: LONG_MAX, long long: LLONG_MAX, \
 642                 default: TIME_T_MAX_NO_PADDING)                     \
 643      : (time_t) -1)
 644 #else
 645 # define TIME_T_MIN TIME_T_MIN_NO_PADDING
 646 # define TIME_T_MAX TIME_T_MAX_NO_PADDING
 647 #endif
 648
 649 /*
 650 ** 302 / 1000 is log10(2.0) rounded up.
 651 ** Subtract one for the sign bit if the type is signed;
 652 ** add one for integer division truncation;
 653 ** add one more for a minus sign if the type is signed.
 654 */
 655 #define INT_STRLEN_MAXIMUM(type) \
 656         ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + \
 657         1 + TYPE_SIGNED(type))
 658
 659 /*
 660 ** INITIALIZE(x)
 661 */
 662
 663 #ifdef GCC_LINT
 664 # define INITIALIZE(x)  ((x) = 0)
 665 #else
 666 # define INITIALIZE(x)
 667 #endif
 668
 669 #ifndef UNINIT_TRAP
 670 # define UNINIT_TRAP 0
 671 #endif
 672
 673 /*
 674 ** For the benefit of GNU folk...
 675 ** '_(MSGID)' uses the current locale's message library string for MSGID.
 676 ** The default is to use gettext if available, and use MSGID otherwise.
 677 */
 678
 679 #if HAVE_GETTEXT
 680 #define _(msgid) gettext(msgid)
 681 #else /* !HAVE_GETTEXT */
 682 #define _(msgid) msgid
 683 #endif /* !HAVE_GETTEXT */
 684
 685 #if !defined TZ_DOMAIN && defined HAVE_GETTEXT
 686 # define TZ_DOMAIN "tz"
 687 #endif
 688
 689 #if HAVE_INCOMPATIBLE_CTIME_R
 690 #undef asctime_r
 691 #undef ctime_r
 692 char *asctime_r(struct tm const *, char *);
 693 char *ctime_r(time_t const *, char *);
 694 #endif /* HAVE_INCOMPATIBLE_CTIME_R */
 695
 696 /* Handy macros that are independent of tzfile implementation.  */
 697
 698 #define YEARSPERREPEAT          400     /* years before a Gregorian repeat */
 699
 700 #define SECSPERMIN      60
 701 #define MINSPERHOUR     60
 702 #define HOURSPERDAY     24
 703 #define DAYSPERWEEK     7
 704 #define DAYSPERNYEAR    365
 705 #define DAYSPERLYEAR    366
 706 #define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
 707 #define SECSPERDAY      ((int_fast32_t) SECSPERHOUR * HOURSPERDAY)
 708 #define MONSPERYEAR     12
 709
 710 #define TM_SUNDAY       0
 711 #define TM_MONDAY       1
 712 #define TM_TUESDAY      2
 713 #define TM_WEDNESDAY    3
 714 #define TM_THURSDAY     4
 715 #define TM_FRIDAY       5
 716 #define TM_SATURDAY     6
 717
 718 #define TM_JANUARY      0
 719 #define TM_FEBRUARY     1
 720 #define TM_MARCH        2
 721 #define TM_APRIL        3
 722 #define TM_MAY          4
 723 #define TM_JUNE         5
 724 #define TM_JULY         6
 725 #define TM_AUGUST       7
 726 #define TM_SEPTEMBER    8
 727 #define TM_OCTOBER      9
 728 #define TM_NOVEMBER     10
 729 #define TM_DECEMBER     11
 730
 731 #define TM_YEAR_BASE    1900
 732
 733 #define EPOCH_YEAR      1970
 734 #define EPOCH_WDAY      TM_THURSDAY
 735
 736 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
 737
 738 /*
 739 ** Since everything in isleap is modulo 400 (or a factor of 400), we know that
 740 **      isleap(y) == isleap(y % 400)
 741 ** and so
 742 **      isleap(a + b) == isleap((a + b) % 400)
 743 ** or
 744 **      isleap(a + b) == isleap(a % 400 + b % 400)
 745 ** This is true even if % means modulo rather than Fortran remainder
 746 ** (which is allowed by C89 but not by C99 or later).
 747 ** We use this to avoid addition overflow problems.
 748 */
 749
 750 #define isleap_sum(a, b)        isleap((a) % 400 + (b) % 400)
 751
 752
 753 /*
 754 ** The Gregorian year averages 365.2425 days, which is 31556952 seconds.
 755 */
 756
 757 #define AVGSECSPERYEAR          31556952L
 758 #define SECSPERREPEAT \
 759   ((int_fast64_t) YEARSPERREPEAT * (int_fast64_t) AVGSECSPERYEAR)
 760 #define SECSPERREPEAT_BITS      34      /* ceil(log2(SECSPERREPEAT)) */
 761
 762 #endif /* !defined PRIVATE_H */