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 /* PORT_TO_C89 means the code should work even if the underlying 21 compiler and library support only C89 plus C99's 'long long' 22 and perhaps a few other extensions to C89. 23 24 This macro is obsolescent, and the plan is to remove it along with 25 associated code. A good time to do that might be in the year 2029 26 because RHEL 7 (whose GCC defaults to C89) extended life cycle 27 support (ELS) is scheduled to end on 2028-06-30. */ 28 #ifndef PORT_TO_C89 29 # define PORT_TO_C89 0 30 #endif 31 32 /* SUPPORT_C89 means the tzcode library should support C89 callers 33 in addition to the usual support for C99-and-later callers. 34 This defaults to 1 as POSIX requires, even though that can trigger 35 latent bugs in callers. */ 36 #ifndef SUPPORT_C89 37 # define SUPPORT_C89 1 38 #endif 39 40 41 /* The following feature-test macros should be defined before 42 any #include of a system header. */ 43 44 /* Enable tm_gmtoff, tm_zone, and environ on GNUish systems. */ 45 #define _GNU_SOURCE 1 46 /* Fix asctime_r on Solaris 11. */ 47 #define _POSIX_PTHREAD_SEMANTICS 1 48 /* Enable strtoimax on pre-C99 Solaris 11. */ 49 #define __EXTENSIONS__ 1 50 /* Cause MS-Windows headers to define POSIX names. */ 51 #define _CRT_DECLARE_NONSTDC_NAMES 1 52 /* Prevent MS-Windows headers from defining min and max. */ 53 #define NOMINMAX 1 54 55 /* On GNUish systems where time_t might be 32 or 64 bits, use 64. 56 On these platforms _FILE_OFFSET_BITS must also be 64; otherwise 57 setting _TIME_BITS to 64 does not work. The code does not 58 otherwise rely on _FILE_OFFSET_BITS being 64, since it does not 59 use off_t or functions like 'stat' that depend on off_t. */ 60 #ifndef _TIME_BITS 61 # ifndef _FILE_OFFSET_BITS 62 # define _FILE_OFFSET_BITS 64 63 # endif 64 # if _FILE_OFFSET_BITS == 64 65 # define _TIME_BITS 64 66 # endif 67 #endif 68 69 /* End of feature-test macro definitions. */ 70 71 72 #ifndef __STDC_VERSION__ 73 # define __STDC_VERSION__ 0 74 #endif 75 76 /* Define true, false and bool if they don't work out of the box. */ 77 #if PORT_TO_C89 && __STDC_VERSION__ < 199901 78 # define true 1 79 # define false 0 80 # define bool int 81 #elif __STDC_VERSION__ < 202311 82 # include <stdbool.h> 83 #endif 84 85 #if __STDC_VERSION__ < 202311 86 # undef static_assert 87 # define static_assert(cond) extern int static_assert_check[(cond) ? 1 : -1] 88 #endif 89 90 /* 91 ** zdump has been made independent of the rest of the time 92 ** conversion package to increase confidence in the verification it provides. 93 ** You can use zdump to help in verifying other implementations. 94 ** To do this, compile with -DUSE_LTZ=0 and link without the tz library. 95 */ 96 #ifndef USE_LTZ 97 # define USE_LTZ 1 98 #endif 99 100 /* This string was in the Factory zone through version 2016f. */ 101 #define GRANDPARENTED "Local time zone must be set--see zic manual page" 102 103 /* 104 ** Defaults for preprocessor symbols. 105 ** You can override these in your C compiler options, e.g. '-DHAVE_GETTEXT=1'. 106 */ 107 108 #if !defined HAVE__GENERIC && defined __has_extension 109 # if !__has_extension(c_generic_selections) 110 # define HAVE__GENERIC 0 111 # endif 112 #endif 113 /* _Generic is buggy in pre-4.9 GCC. */ 114 #if !defined HAVE__GENERIC && defined __GNUC__ && !defined __STRICT_ANSI__ 115 # define HAVE__GENERIC (4 < __GNUC__ + (9 <= __GNUC_MINOR__)) 116 #endif 117 #ifndef HAVE__GENERIC 118 # define HAVE__GENERIC (201112 <= __STDC_VERSION__) 119 #endif 120 121 #if !defined HAVE_GETTEXT && defined __has_include 122 # if __has_include(<libintl.h>) 123 # define HAVE_GETTEXT 1 124 # endif 125 #endif 126 #ifndef HAVE_GETTEXT 127 # define HAVE_GETTEXT 0 128 #endif 129 130 #ifndef HAVE_INCOMPATIBLE_CTIME_R 131 # define HAVE_INCOMPATIBLE_CTIME_R 0 132 #endif 133 134 #ifndef HAVE_LINK 135 # define HAVE_LINK 1 136 #endif /* !defined HAVE_LINK */ 137 138 #ifndef HAVE_MALLOC_ERRNO 139 # define HAVE_MALLOC_ERRNO 1 140 #endif 141 142 #ifndef HAVE_POSIX_DECLS 143 # define HAVE_POSIX_DECLS 1 144 #endif 145 146 #ifndef HAVE_SETENV 147 # define HAVE_SETENV 1 148 #endif 149 150 #ifndef HAVE_STRDUP 151 # define HAVE_STRDUP 1 152 #endif 153 154 #ifndef HAVE_SYMLINK 155 # define HAVE_SYMLINK 1 156 #endif /* !defined HAVE_SYMLINK */ 157 158 #if !defined HAVE_SYS_STAT_H && defined __has_include 159 # if !__has_include(<sys/stat.h>) 160 # define HAVE_SYS_STAT_H 0 161 # endif 162 #endif 163 #ifndef HAVE_SYS_STAT_H 164 # define HAVE_SYS_STAT_H 1 165 #endif 166 167 #if !defined HAVE_UNISTD_H && defined __has_include 168 # if !__has_include(<unistd.h>) 169 # define HAVE_UNISTD_H 0 170 # endif 171 #endif 172 #ifndef HAVE_UNISTD_H 173 # define HAVE_UNISTD_H 1 174 #endif 175 176 #ifndef NETBSD_INSPIRED 177 # define NETBSD_INSPIRED 1 178 #endif 179 180 #if HAVE_INCOMPATIBLE_CTIME_R 181 # define asctime_r _incompatible_asctime_r 182 # define ctime_r _incompatible_ctime_r 183 #endif /* HAVE_INCOMPATIBLE_CTIME_R */ 184 185 /* 186 ** Nested includes 187 */ 188 189 /* Avoid clashes with NetBSD by renaming NetBSD's declarations. 190 If defining the 'timezone' variable, avoid a clash with FreeBSD's 191 'timezone' function by renaming its declaration. */ 192 #define localtime_rz sys_localtime_rz 193 #define mktime_z sys_mktime_z 194 #define posix2time_z sys_posix2time_z 195 #define time2posix_z sys_time2posix_z 196 #if defined USG_COMPAT && USG_COMPAT == 2 197 # define timezone sys_timezone 198 #endif 199 #define timezone_t sys_timezone_t 200 #define tzalloc sys_tzalloc 201 #define tzfree sys_tzfree 202 #include <time.h> 203 #undef localtime_rz 204 #undef mktime_z 205 #undef posix2time_z 206 #undef time2posix_z 207 #if defined USG_COMPAT && USG_COMPAT == 2 208 # undef timezone 209 #endif 210 #undef timezone_t 211 #undef tzalloc 212 #undef tzfree 213 214 #include <stddef.h> 215 #include <string.h> 216 #if !PORT_TO_C89 217 # include <inttypes.h> 218 #endif 219 #include <limits.h> /* for CHAR_BIT et al. */ 220 #include <stdlib.h> 221 222 #include <errno.h> 223 224 #ifndef EINVAL 225 # define EINVAL ERANGE 226 #endif 227 228 #ifndef ELOOP 229 # define ELOOP EINVAL 230 #endif 231 #ifndef ENAMETOOLONG 232 # define ENAMETOOLONG EINVAL 233 #endif 234 #ifndef ENOMEM 235 # define ENOMEM EINVAL 236 #endif 237 #ifndef ENOTSUP 238 # define ENOTSUP EINVAL 239 #endif 240 #ifndef EOVERFLOW 241 # define EOVERFLOW EINVAL 242 #endif 243 244 #if HAVE_GETTEXT 245 # include <libintl.h> 246 #endif /* HAVE_GETTEXT */ 247 248 #if HAVE_UNISTD_H 249 # include <unistd.h> /* for R_OK, and other POSIX goodness */ 250 #endif /* HAVE_UNISTD_H */ 251 252 /* SUPPORT_POSIX2008 means the tzcode library should support 253 POSIX.1-2017-and-earlier callers in addition to the usual support for 254 POSIX.1-2024-and-later callers; however, this can be 255 incompatible with POSIX.1-2024-and-later callers. 256 This macro is obsolescent, and the plan is to remove it 257 along with any code needed only when it is nonzero. 258 A good time to do that might be in the year 2034. 259 This macro's name is SUPPORT_POSIX2008 because _POSIX_VERSION == 200809 260 in POSIX.1-2017, a minor revision of POSIX.1-2008. */ 261 #ifndef SUPPORT_POSIX2008 262 # if defined _POSIX_VERSION && _POSIX_VERSION <= 200809 263 # define SUPPORT_POSIX2008 1 264 # else 265 # define SUPPORT_POSIX2008 0 266 # endif 267 #endif 268 269 #ifndef HAVE_DECL_ASCTIME_R 270 # if SUPPORT_POSIX2008 271 # define HAVE_DECL_ASCTIME_R 1 272 # else 273 # define HAVE_DECL_ASCTIME_R 0 274 # endif 275 #endif 276 277 #ifndef HAVE_SNPRINTF 278 # define HAVE_SNPRINTF (!PORT_TO_C89 || 199901 <= __STDC_VERSION__) 279 #endif 280 281 #ifndef HAVE_STRFTIME_L 282 # if _POSIX_VERSION < 200809 283 # define HAVE_STRFTIME_L 0 284 # else 285 # define HAVE_STRFTIME_L 1 286 # endif 287 #endif 288 289 #ifndef USG_COMPAT 290 # ifndef _XOPEN_VERSION 291 # define USG_COMPAT 0 292 # else 293 # define USG_COMPAT 1 294 # endif 295 #endif 296 297 #ifndef HAVE_TZNAME 298 # if _POSIX_VERSION < 198808 && !USG_COMPAT 299 # define HAVE_TZNAME 0 300 # else 301 # define HAVE_TZNAME 1 302 # endif 303 #endif 304 305 #ifndef ALTZONE 306 # if defined __sun || defined _M_XENIX 307 # define ALTZONE 1 308 # else 309 # define ALTZONE 0 310 # endif 311 #endif 312 313 #ifndef R_OK 314 # define R_OK 4 315 #endif /* !defined R_OK */ 316 317 #if PORT_TO_C89 318 319 /* 320 ** Define HAVE_STDINT_H's default value here, rather than at the 321 ** start, since __GLIBC__ and INTMAX_MAX's values depend on 322 ** previously included files. glibc 2.1 and Solaris 10 and later have 323 ** stdint.h, even with pre-C99 compilers. 324 */ 325 #if !defined HAVE_STDINT_H && defined __has_include 326 # define HAVE_STDINT_H 1 /* C23 __has_include implies C99 stdint.h. */ 327 #endif 328 #ifndef HAVE_STDINT_H 329 # define HAVE_STDINT_H \ 330 (199901 <= __STDC_VERSION__ \ 331 || 2 < __GLIBC__ + (1 <= __GLIBC_MINOR__) \ 332 || __CYGWIN__ || INTMAX_MAX) 333 #endif /* !defined HAVE_STDINT_H */ 334 335 #if HAVE_STDINT_H 336 # include <stdint.h> 337 #endif /* !HAVE_STDINT_H */ 338 339 #ifndef HAVE_INTTYPES_H 340 # define HAVE_INTTYPES_H HAVE_STDINT_H 341 #endif 342 #if HAVE_INTTYPES_H 343 # include <inttypes.h> 344 #endif 345 346 /* Pre-C99 GCC compilers define __LONG_LONG_MAX__ instead of LLONG_MAX. */ 347 #if defined __LONG_LONG_MAX__ && !defined __STRICT_ANSI__ 348 # ifndef LLONG_MAX 349 # define LLONG_MAX __LONG_LONG_MAX__ 350 # endif 351 # ifndef LLONG_MIN 352 # define LLONG_MIN (-1 - LLONG_MAX) 353 # endif 354 # ifndef ULLONG_MAX 355 # define ULLONG_MAX (LLONG_MAX * 2ull + 1) 356 # endif 357 #endif 358 359 #ifndef INT_FAST64_MAX 360 # if 1 <= LONG_MAX >> 31 >> 31 361 typedef long int_fast64_t; 362 # define INT_FAST64_MIN LONG_MIN 363 # define INT_FAST64_MAX LONG_MAX 364 # else 365 /* If this fails, compile with -DHAVE_STDINT_H or with a better compiler. */ 366 typedef long long int_fast64_t; 367 # define INT_FAST64_MIN LLONG_MIN 368 # define INT_FAST64_MAX LLONG_MAX 369 # endif 370 #endif 371 372 #ifndef PRIdFAST64 373 # if INT_FAST64_MAX == LONG_MAX 374 # define PRIdFAST64 "ld" 375 # else 376 # define PRIdFAST64 "lld" 377 # endif 378 #endif 379 380 #ifndef SCNdFAST64 381 # define SCNdFAST64 PRIdFAST64 382 #endif 383 384 #ifndef INT_FAST32_MAX 385 # if INT_MAX >> 31 == 0 386 typedef long int_fast32_t; 387 # define INT_FAST32_MAX LONG_MAX 388 # define INT_FAST32_MIN LONG_MIN 389 # else 390 typedef int int_fast32_t; 391 # define INT_FAST32_MAX INT_MAX 392 # define INT_FAST32_MIN INT_MIN 393 # endif 394 #endif 395 396 #ifndef INT_LEAST32_MAX 397 typedef int_fast32_t int_least32_t; 398 #endif 399 400 #ifndef INTMAX_MAX 401 # ifdef LLONG_MAX 402 typedef long long intmax_t; 403 # ifndef HAVE_STRTOLL 404 # define HAVE_STRTOLL 1 405 # endif 406 # if HAVE_STRTOLL 407 # define strtoimax strtoll 408 # endif 409 # define INTMAX_MAX LLONG_MAX 410 # define INTMAX_MIN LLONG_MIN 411 # else 412 typedef long intmax_t; 413 # define INTMAX_MAX LONG_MAX 414 # define INTMAX_MIN LONG_MIN 415 # endif 416 # ifndef strtoimax 417 # define strtoimax strtol 418 # endif 419 #endif 420 421 #ifndef PRIdMAX 422 # if INTMAX_MAX == LLONG_MAX 423 # define PRIdMAX "lld" 424 # else 425 # define PRIdMAX "ld" 426 # endif 427 #endif 428 429 #ifndef PTRDIFF_MAX 430 # define PTRDIFF_MAX MAXVAL(ptrdiff_t, TYPE_BIT(ptrdiff_t)) 431 #endif 432 433 #ifndef UINT_FAST32_MAX 434 typedef unsigned long uint_fast32_t; 435 #endif 436 437 #ifndef UINT_FAST64_MAX 438 # if 3 <= ULONG_MAX >> 31 >> 31 439 typedef unsigned long uint_fast64_t; 440 # define UINT_FAST64_MAX ULONG_MAX 441 # else 442 /* If this fails, compile with -DHAVE_STDINT_H or with a better compiler. */ 443 typedef unsigned long long uint_fast64_t; 444 # define UINT_FAST64_MAX ULLONG_MAX 445 # endif 446 #endif 447 448 #ifndef UINTMAX_MAX 449 # ifdef ULLONG_MAX 450 typedef unsigned long long uintmax_t; 451 # define UINTMAX_MAX ULLONG_MAX 452 # else 453 typedef unsigned long uintmax_t; 454 # define UINTMAX_MAX ULONG_MAX 455 # endif 456 #endif 457 458 #ifndef PRIuMAX 459 # ifdef ULLONG_MAX 460 # define PRIuMAX "llu" 461 # else 462 # define PRIuMAX "lu" 463 # endif 464 #endif 465 466 #ifndef SIZE_MAX 467 # define SIZE_MAX ((size_t) -1) 468 #endif 469 470 #endif /* PORT_TO_C89 */ 471 472 /* The maximum size of any created object, as a signed integer. 473 Although the C standard does not outright prohibit larger objects, 474 behavior is undefined if the result of pointer subtraction does not 475 fit into ptrdiff_t, and the code assumes in several places that 476 pointer subtraction works. As a practical matter it's OK to not 477 support objects larger than this. */ 478 #define INDEX_MAX ((ptrdiff_t) min(PTRDIFF_MAX, SIZE_MAX)) 479 480 /* Support ckd_add, ckd_sub, ckd_mul on C23 or recent-enough GCC-like 481 hosts, unless compiled with -DHAVE_STDCKDINT_H=0 or with pre-C23 EDG. */ 482 #if !defined HAVE_STDCKDINT_H && defined __has_include 483 # if __has_include(<stdckdint.h>) 484 # define HAVE_STDCKDINT_H 1 485 # endif 486 #endif 487 #ifdef HAVE_STDCKDINT_H 488 # if HAVE_STDCKDINT_H 489 # include <stdckdint.h> 490 # endif 491 #elif defined __EDG__ 492 /* Do nothing, to work around EDG bug <https://bugs.gnu.org/53256>. */ 493 #elif defined __has_builtin 494 # if __has_builtin(__builtin_add_overflow) 495 # define ckd_add(r, a, b) __builtin_add_overflow(a, b, r) 496 # endif 497 # if __has_builtin(__builtin_sub_overflow) 498 # define ckd_sub(r, a, b) __builtin_sub_overflow(a, b, r) 499 # endif 500 # if __has_builtin(__builtin_mul_overflow) 501 # define ckd_mul(r, a, b) __builtin_mul_overflow(a, b, r) 502 # endif 503 #elif 7 <= __GNUC__ 504 # define ckd_add(r, a, b) __builtin_add_overflow(a, b, r) 505 # define ckd_sub(r, a, b) __builtin_sub_overflow(a, b, r) 506 # define ckd_mul(r, a, b) __builtin_mul_overflow(a, b, r) 507 #endif 508 509 #if (defined __has_c_attribute \ 510 && (202311 <= __STDC_VERSION__ || !defined __STRICT_ANSI__)) 511 # define HAVE___HAS_C_ATTRIBUTE true 512 #else 513 # define HAVE___HAS_C_ATTRIBUTE false 514 #endif 515 516 #if HAVE___HAS_C_ATTRIBUTE 517 # if __has_c_attribute(deprecated) 518 # define ATTRIBUTE_DEPRECATED [[deprecated]] 519 # endif 520 #endif 521 #ifndef ATTRIBUTE_DEPRECATED 522 # if 3 < __GNUC__ + (2 <= __GNUC_MINOR__) 523 # define ATTRIBUTE_DEPRECATED __attribute__((deprecated)) 524 # else 525 # define ATTRIBUTE_DEPRECATED /* empty */ 526 # endif 527 #endif 528 529 #if HAVE___HAS_C_ATTRIBUTE 530 # if __has_c_attribute(fallthrough) 531 # define ATTRIBUTE_FALLTHROUGH [[fallthrough]] 532 # endif 533 #endif 534 #ifndef ATTRIBUTE_FALLTHROUGH 535 # if 7 <= __GNUC__ 536 # define ATTRIBUTE_FALLTHROUGH __attribute__((fallthrough)) 537 # else 538 # define ATTRIBUTE_FALLTHROUGH ((void) 0) 539 # endif 540 #endif 541 542 #if HAVE___HAS_C_ATTRIBUTE 543 # if __has_c_attribute(maybe_unused) 544 # define ATTRIBUTE_MAYBE_UNUSED [[maybe_unused]] 545 # endif 546 #endif 547 #ifndef ATTRIBUTE_MAYBE_UNUSED 548 # if 2 < __GNUC__ + (7 <= __GNUC_MINOR__) 549 # define ATTRIBUTE_MAYBE_UNUSED __attribute__((unused)) 550 # else 551 # define ATTRIBUTE_MAYBE_UNUSED /* empty */ 552 # endif 553 #endif 554 555 #if HAVE___HAS_C_ATTRIBUTE 556 # if __has_c_attribute(noreturn) 557 # define ATTRIBUTE_NORETURN [[noreturn]] 558 # endif 559 #endif 560 #ifndef ATTRIBUTE_NORETURN 561 # if 201112 <= __STDC_VERSION__ 562 # define ATTRIBUTE_NORETURN _Noreturn 563 # elif 2 < __GNUC__ + (8 <= __GNUC_MINOR__) 564 # define ATTRIBUTE_NORETURN __attribute__((noreturn)) 565 # else 566 # define ATTRIBUTE_NORETURN /* empty */ 567 # endif 568 #endif 569 570 #if HAVE___HAS_C_ATTRIBUTE 571 # if __has_c_attribute(reproducible) 572 # define ATTRIBUTE_REPRODUCIBLE [[reproducible]] 573 # endif 574 #endif 575 #ifndef ATTRIBUTE_REPRODUCIBLE 576 # define ATTRIBUTE_REPRODUCIBLE /* empty */ 577 #endif 578 579 #if HAVE___HAS_C_ATTRIBUTE 580 # if __has_c_attribute(unsequenced) 581 # define ATTRIBUTE_UNSEQUENCED [[unsequenced]] 582 # endif 583 #endif 584 #ifndef ATTRIBUTE_UNSEQUENCED 585 # define ATTRIBUTE_UNSEQUENCED /* empty */ 586 #endif 587 588 /* GCC attributes that are useful in tzcode. 589 __attribute__((const)) is stricter than [[unsequenced]], 590 so the latter is an adequate substitute in non-GCC C23 platforms. 591 __attribute__((pure)) is stricter than [[reproducible]], 592 so the latter is an adequate substitute in non-GCC C23 platforms. */ 593 #if __GNUC__ < 3 594 # define ATTRIBUTE_CONST ATTRIBUTE_UNSEQUENCED 595 # define ATTRIBUTE_FORMAT(spec) /* empty */ 596 # define ATTRIBUTE_PURE ATTRIBUTE_REPRODUCIBLE 597 #else 598 # define ATTRIBUTE_CONST __attribute__((const)) 599 # define ATTRIBUTE_FORMAT(spec) __attribute__((format spec)) 600 # define ATTRIBUTE_PURE __attribute__((pure)) 601 #endif 602 603 /* Avoid GCC bug 114833 <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114833>. 604 Remove this macro and its uses when the bug is fixed in a GCC release, 605 because only the latest GCC matters for $(GCC_DEBUG_FLAGS). */ 606 #ifdef GCC_LINT 607 # define ATTRIBUTE_PURE_114833 ATTRIBUTE_PURE 608 #else 609 # define ATTRIBUTE_PURE_114833 /* empty */ 610 #endif 611 612 #if (__STDC_VERSION__ < 199901 && !defined restrict \ 613 && (PORT_TO_C89 || defined _MSC_VER)) 614 # define restrict /* empty */ 615 #endif 616 617 /* 618 ** Workarounds for compilers/systems. 619 */ 620 621 #ifndef EPOCH_LOCAL 622 # define EPOCH_LOCAL 0 623 #endif 624 #ifndef EPOCH_OFFSET 625 # define EPOCH_OFFSET 0 626 #endif 627 #ifndef RESERVE_STD_EXT_IDS 628 # define RESERVE_STD_EXT_IDS 0 629 #endif 630 631 #ifdef time_tz 632 # define defined_time_tz true 633 #else 634 # define defined_time_tz false 635 #endif 636 637 /* If standard C identifiers with external linkage (e.g., localtime) 638 are reserved and are not already being renamed anyway, rename them 639 as if compiling with '-Dtime_tz=time_t'. */ 640 #if !defined time_tz && RESERVE_STD_EXT_IDS && USE_LTZ 641 # define time_tz time_t 642 #endif 643 644 /* 645 ** Compile with -Dtime_tz=T to build the tz package with a private 646 ** time_t type equivalent to T rather than the system-supplied time_t. 647 ** This debugging feature can test unusual design decisions 648 ** (e.g., time_t wider than 'long', or unsigned time_t) even on 649 ** typical platforms. 650 */ 651 #if defined time_tz || EPOCH_LOCAL || EPOCH_OFFSET != 0 652 # define TZ_TIME_T true 653 #else 654 # define TZ_TIME_T false 655 #endif 656 657 #if defined LOCALTIME_IMPLEMENTATION && TZ_TIME_T 658 static time_t sys_time(time_t *x) { return time(x); } 659 #endif 660 661 #if TZ_TIME_T 662 663 typedef time_tz tz_time_t; 664 665 # undef asctime 666 # define asctime tz_asctime 667 # undef ctime 668 # define ctime tz_ctime 669 # undef difftime 670 # define difftime tz_difftime 671 # undef gmtime 672 # define gmtime tz_gmtime 673 # undef gmtime_r 674 # define gmtime_r tz_gmtime_r 675 # undef localtime 676 # define localtime tz_localtime 677 # undef localtime_r 678 # define localtime_r tz_localtime_r 679 # undef localtime_rz 680 # define localtime_rz tz_localtime_rz 681 # undef mktime 682 # define mktime tz_mktime 683 # undef mktime_z 684 # define mktime_z tz_mktime_z 685 # undef offtime 686 # define offtime tz_offtime 687 # undef posix2time 688 # define posix2time tz_posix2time 689 # undef posix2time_z 690 # define posix2time_z tz_posix2time_z 691 # undef strftime 692 # define strftime tz_strftime 693 # undef time 694 # define time tz_time 695 # undef time2posix 696 # define time2posix tz_time2posix 697 # undef time2posix_z 698 # define time2posix_z tz_time2posix_z 699 # undef time_t 700 # define time_t tz_time_t 701 # undef timegm 702 # define timegm tz_timegm 703 # undef timelocal 704 # define timelocal tz_timelocal 705 # undef timeoff 706 # define timeoff tz_timeoff 707 # undef tzalloc 708 # define tzalloc tz_tzalloc 709 # undef tzfree 710 # define tzfree tz_tzfree 711 # undef tzset 712 # define tzset tz_tzset 713 # if SUPPORT_POSIX2008 714 # undef asctime_r 715 # define asctime_r tz_asctime_r 716 # undef ctime_r 717 # define ctime_r tz_ctime_r 718 # endif 719 # if HAVE_STRFTIME_L 720 # undef strftime_l 721 # define strftime_l tz_strftime_l 722 # endif 723 # if HAVE_TZNAME 724 # undef tzname 725 # define tzname tz_tzname 726 # endif 727 # if USG_COMPAT 728 # undef daylight 729 # define daylight tz_daylight 730 # undef timezone 731 # define timezone tz_timezone 732 # endif 733 # if ALTZONE 734 # undef altzone 735 # define altzone tz_altzone 736 # endif 737 738 # if __STDC_VERSION__ < 202311 739 # define DEPRECATED_IN_C23 /* empty */ 740 # else 741 # define DEPRECATED_IN_C23 ATTRIBUTE_DEPRECATED 742 # endif 743 DEPRECATED_IN_C23 char *asctime(struct tm const *); 744 DEPRECATED_IN_C23 char *ctime(time_t const *); 745 #if SUPPORT_POSIX2008 746 char *asctime_r(struct tm const *restrict, char *restrict); 747 char *ctime_r(time_t const *, char *); 748 #endif 749 ATTRIBUTE_CONST double difftime(time_t, time_t); 750 size_t strftime(char *restrict, size_t, char const *restrict, 751 struct tm const *restrict); 752 # if HAVE_STRFTIME_L 753 size_t strftime_l(char *restrict, size_t, char const *restrict, 754 struct tm const *restrict, locale_t); 755 # endif 756 struct tm *gmtime(time_t const *); 757 struct tm *gmtime_r(time_t const *restrict, struct tm *restrict); 758 struct tm *localtime(time_t const *); 759 struct tm *localtime_r(time_t const *restrict, struct tm *restrict); 760 time_t mktime(struct tm *); 761 time_t time(time_t *); 762 time_t timegm(struct tm *); 763 void tzset(void); 764 #endif 765 766 #ifndef HAVE_DECL_TIMEGM 767 # if (202311 <= __STDC_VERSION__ \ 768 || defined __GLIBC__ || defined __tm_zone /* musl */ \ 769 || defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ \ 770 || (defined __APPLE__ && defined __MACH__)) 771 # define HAVE_DECL_TIMEGM 1 772 # else 773 # define HAVE_DECL_TIMEGM 0 774 # endif 775 #endif 776 #if !HAVE_DECL_TIMEGM && !defined timegm 777 time_t timegm(struct tm *); 778 #endif 779 780 #if !HAVE_DECL_ASCTIME_R && !defined asctime_r && SUPPORT_POSIX2008 781 extern char *asctime_r(struct tm const *restrict, char *restrict); 782 #endif 783 784 #ifndef HAVE_DECL_ENVIRON 785 # if defined environ || defined __USE_GNU 786 # define HAVE_DECL_ENVIRON 1 787 # else 788 # define HAVE_DECL_ENVIRON 0 789 # endif 790 #endif 791 792 #if !HAVE_DECL_ENVIRON 793 extern char **environ; 794 #endif 795 796 #if 2 <= HAVE_TZNAME + (TZ_TIME_T || !HAVE_POSIX_DECLS) 797 extern char *tzname[]; 798 #endif 799 #if 2 <= USG_COMPAT + (TZ_TIME_T || !HAVE_POSIX_DECLS) 800 extern long timezone; 801 extern int daylight; 802 #endif 803 #if 2 <= ALTZONE + (TZ_TIME_T || !HAVE_POSIX_DECLS) 804 extern long altzone; 805 #endif 806 807 /* 808 ** The STD_INSPIRED functions are similar, but most also need 809 ** declarations if time_tz is defined. 810 */ 811 812 #ifndef STD_INSPIRED 813 # ifdef __NetBSD__ 814 # define STD_INSPIRED 1 815 # else 816 # define STD_INSPIRED 0 817 # endif 818 #endif 819 #if STD_INSPIRED 820 # if TZ_TIME_T || !defined offtime 821 struct tm *offtime(time_t const *, long); 822 # endif 823 # if TZ_TIME_T || !defined timelocal 824 time_t timelocal(struct tm *); 825 # endif 826 # if TZ_TIME_T || !defined timeoff 827 # define EXTERN_TIMEOFF 828 # endif 829 # if TZ_TIME_T || !defined time2posix 830 time_t time2posix(time_t); 831 # endif 832 # if TZ_TIME_T || !defined posix2time 833 time_t posix2time(time_t); 834 # endif 835 #endif 836 837 /* Infer TM_ZONE on systems where this information is known, but suppress 838 guessing if NO_TM_ZONE is defined. Similarly for TM_GMTOFF. */ 839 #if (200809 < _POSIX_VERSION \ 840 || defined __GLIBC__ \ 841 || defined __tm_zone /* musl */ \ 842 || defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ \ 843 || (defined __APPLE__ && defined __MACH__)) 844 # if !defined TM_GMTOFF && !defined NO_TM_GMTOFF 845 # define TM_GMTOFF tm_gmtoff 846 # endif 847 # if !defined TM_ZONE && !defined NO_TM_ZONE 848 # define TM_ZONE tm_zone 849 # endif 850 #endif 851 852 /* 853 ** Define functions that are ABI compatible with NetBSD but have 854 ** better prototypes. NetBSD 6.1.4 defines a pointer type timezone_t 855 ** and labors under the misconception that 'const timezone_t' is a 856 ** pointer to a constant. This use of 'const' is ineffective, so it 857 ** is not done here. What we call 'struct state' NetBSD calls 858 ** 'struct __state', but this is a private name so it doesn't matter. 859 */ 860 #if NETBSD_INSPIRED 861 typedef struct state *timezone_t; 862 struct tm *localtime_rz(timezone_t restrict, time_t const *restrict, 863 struct tm *restrict); 864 time_t mktime_z(timezone_t restrict, struct tm *restrict); 865 timezone_t tzalloc(char const *); 866 void tzfree(timezone_t); 867 # if STD_INSPIRED 868 # if TZ_TIME_T || !defined posix2time_z 869 ATTRIBUTE_PURE time_t posix2time_z(timezone_t, time_t); 870 # endif 871 # if TZ_TIME_T || !defined time2posix_z 872 ATTRIBUTE_PURE time_t time2posix_z(timezone_t, time_t); 873 # endif 874 # endif 875 #endif 876 877 /* 878 ** Finally, some convenience items. 879 */ 880 881 #define TYPE_BIT(type) (CHAR_BIT * (ptrdiff_t) sizeof(type)) 882 #define TYPE_SIGNED(type) (((type) -1) < 0) 883 #define TWOS_COMPLEMENT(t) ((t) ~ (t) 0 < 0) 884 885 /* Minimum and maximum of two values. Use lower case to avoid 886 naming clashes with standard include files. */ 887 #define max(a, b) ((a) > (b) ? (a) : (b)) 888 #define min(a, b) ((a) < (b) ? (a) : (b)) 889 890 /* Max and min values of the integer type T, of which only the bottom 891 B bits are used, and where the highest-order used bit is considered 892 to be a sign bit if T is signed. */ 893 #define MAXVAL(t, b) \ 894 ((t) (((t) 1 << ((b) - 1 - TYPE_SIGNED(t))) \ 895 - 1 + ((t) 1 << ((b) - 1 - TYPE_SIGNED(t))))) 896 #define MINVAL(t, b) \ 897 ((t) (TYPE_SIGNED(t) ? - TWOS_COMPLEMENT(t) - MAXVAL(t, b) : 0)) 898 899 /* The extreme time values, assuming no padding. */ 900 #define TIME_T_MIN_NO_PADDING MINVAL(time_t, TYPE_BIT(time_t)) 901 #define TIME_T_MAX_NO_PADDING MAXVAL(time_t, TYPE_BIT(time_t)) 902 903 /* The extreme time values. These are macros, not constants, so that 904 any portability problems occur only when compiling .c files that use 905 the macros, which is safer for applications that need only zdump and zic. 906 This implementation assumes no padding if time_t is signed and 907 either the compiler lacks support for _Generic or time_t is not one 908 of the standard signed integer types. */ 909 #if HAVE__GENERIC 910 # define TIME_T_MIN \ 911 _Generic((time_t) 0, \ 912 signed char: SCHAR_MIN, short: SHRT_MIN, \ 913 int: INT_MIN, long: LONG_MIN, long long: LLONG_MIN, \ 914 default: TIME_T_MIN_NO_PADDING) 915 # define TIME_T_MAX \ 916 (TYPE_SIGNED(time_t) \ 917 ? _Generic((time_t) 0, \ 918 signed char: SCHAR_MAX, short: SHRT_MAX, \ 919 int: INT_MAX, long: LONG_MAX, long long: LLONG_MAX, \ 920 default: TIME_T_MAX_NO_PADDING) \ 921 : (time_t) -1) 922 enum { SIGNED_PADDING_CHECK_NEEDED 923 = _Generic((time_t) 0, 924 signed char: false, short: false, 925 int: false, long: false, long long: false, 926 default: true) }; 927 #else 928 # define TIME_T_MIN TIME_T_MIN_NO_PADDING 929 # define TIME_T_MAX TIME_T_MAX_NO_PADDING 930 enum { SIGNED_PADDING_CHECK_NEEDED = true }; 931 #endif 932 /* Try to check the padding assumptions. Although TIME_T_MAX and the 933 following check can both have undefined behavior on oddball 934 platforms due to shifts exceeding widths of signed integers, these 935 platforms' compilers are likely to diagnose these issues in integer 936 constant expressions, so it shouldn't hurt to check statically. */ 937 static_assert(! TYPE_SIGNED(time_t) || ! SIGNED_PADDING_CHECK_NEEDED 938 || TIME_T_MAX >> (TYPE_BIT(time_t) - 2) == 1); 939 940 /* 941 ** 302 / 1000 is log10(2.0) rounded up. 942 ** Subtract one for the sign bit if the type is signed; 943 ** add one for integer division truncation; 944 ** add one more for a minus sign if the type is signed. 945 */ 946 #define INT_STRLEN_MAXIMUM(type) \ 947 ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + \ 948 1 + TYPE_SIGNED(type)) 949 950 /* 951 ** INITIALIZE(x) 952 */ 953 954 #ifdef GCC_LINT 955 # define INITIALIZE(x) ((x) = 0) 956 #else 957 # define INITIALIZE(x) 958 #endif 959 960 /* Whether memory access must strictly follow the C standard. 961 If 0, it's OK to read uninitialized storage so long as the value is 962 not relied upon. Defining it to 0 lets mktime access parts of 963 struct tm that might be uninitialized, as a heuristic when the 964 standard doesn't say what to return and when tm_gmtoff can help 965 mktime likely infer a better value. */ 966 #ifndef UNINIT_TRAP 967 # define UNINIT_TRAP 0 968 #endif 969 970 /* strftime.c sometimes needs access to timeoff if it is not already public. 971 tz_private_timeoff should be used only by localtime.c and strftime.c. */ 972 #if (!defined EXTERN_TIMEOFF \ 973 && defined TM_GMTOFF && (200809 < _POSIX_VERSION || ! UNINIT_TRAP)) 974 # ifndef timeoff 975 # define timeoff tz_private_timeoff 976 # endif 977 # define EXTERN_TIMEOFF 978 #endif 979 #ifdef EXTERN_TIMEOFF 980 time_t timeoff(struct tm *, long); 981 #endif 982 983 #ifdef DEBUG 984 # undef unreachable 985 # define unreachable() abort() 986 #elif !defined unreachable 987 # ifdef __has_builtin 988 # if __has_builtin(__builtin_unreachable) 989 # define unreachable() __builtin_unreachable() 990 # endif 991 # elif 4 < __GNUC__ + (5 <= __GNUC_MINOR__) 992 # define unreachable() __builtin_unreachable() 993 # endif 994 # ifndef unreachable 995 # define unreachable() ((void) 0) 996 # endif 997 #endif 998 999 /* 1000 ** For the benefit of GNU folk... 1001 ** '_(MSGID)' uses the current locale's message library string for MSGID. 1002 ** The default is to use gettext if available, and use MSGID otherwise. 1003 */ 1004 1005 #if HAVE_GETTEXT 1006 #define _(msgid) gettext(msgid) 1007 #else /* !HAVE_GETTEXT */ 1008 #define _(msgid) msgid 1009 #endif /* !HAVE_GETTEXT */ 1010 1011 #if !defined TZ_DOMAIN && defined HAVE_GETTEXT 1012 # define TZ_DOMAIN "tz" 1013 #endif 1014 1015 #if HAVE_INCOMPATIBLE_CTIME_R 1016 #undef asctime_r 1017 #undef ctime_r 1018 char *asctime_r(struct tm const *restrict, char *restrict); 1019 char *ctime_r(time_t const *, char *); 1020 #endif /* HAVE_INCOMPATIBLE_CTIME_R */ 1021 1022 #endif /* !defined PRIVATE_H */ 1023