limits.in.h 4.2 KB

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  1. /* A GNU-like <limits.h>.
  2. Copyright 2016-2021 Free Software Foundation, Inc.
  3. This program is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU General Public License
  5. as published by the Free Software Foundation; either version 3, or
  6. (at your option) any later version.
  7. This program is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  10. GNU General Public License for more details.
  11. You should have received a copy of the GNU General Public License
  12. along with this program; if not, see <https://www.gnu.org/licenses/>. */
  13. #if __GNUC__ >= 3
  14. @PRAGMA_SYSTEM_HEADER@
  15. #endif
  16. @PRAGMA_COLUMNS@
  17. #if defined _GL_ALREADY_INCLUDING_LIMITS_H
  18. /* Special invocation convention:
  19. On Haiku/x86_64, we have a sequence of nested includes
  20. <limits.h> -> <syslimits.h> -> <limits.h>.
  21. In this situation, LONG_MAX and INT_MAX are not yet defined,
  22. therefore we should not attempt to define LONG_BIT. */
  23. #@INCLUDE_NEXT@ @NEXT_LIMITS_H@
  24. #else
  25. /* Normal invocation convention. */
  26. #ifndef _@GUARD_PREFIX@_LIMITS_H
  27. # define _GL_ALREADY_INCLUDING_LIMITS_H
  28. /* The include_next requires a split double-inclusion guard. */
  29. # @INCLUDE_NEXT@ @NEXT_LIMITS_H@
  30. # undef _GL_ALREADY_INCLUDING_LIMITS_H
  31. #ifndef _@GUARD_PREFIX@_LIMITS_H
  32. #define _@GUARD_PREFIX@_LIMITS_H
  33. #ifndef LLONG_MIN
  34. # if defined LONG_LONG_MIN /* HP-UX 11.31 */
  35. # define LLONG_MIN LONG_LONG_MIN
  36. # elif defined LONGLONG_MIN /* IRIX 6.5 */
  37. # define LLONG_MIN LONGLONG_MIN
  38. # elif defined __GNUC__
  39. # define LLONG_MIN (- __LONG_LONG_MAX__ - 1LL)
  40. # endif
  41. #endif
  42. #ifndef LLONG_MAX
  43. # if defined LONG_LONG_MAX /* HP-UX 11.31 */
  44. # define LLONG_MAX LONG_LONG_MAX
  45. # elif defined LONGLONG_MAX /* IRIX 6.5 */
  46. # define LLONG_MAX LONGLONG_MAX
  47. # elif defined __GNUC__
  48. # define LLONG_MAX __LONG_LONG_MAX__
  49. # endif
  50. #endif
  51. #ifndef ULLONG_MAX
  52. # if defined ULONG_LONG_MAX /* HP-UX 11.31 */
  53. # define ULLONG_MAX ULONG_LONG_MAX
  54. # elif defined ULONGLONG_MAX /* IRIX 6.5 */
  55. # define ULLONG_MAX ULONGLONG_MAX
  56. # elif defined __GNUC__
  57. # define ULLONG_MAX (__LONG_LONG_MAX__ * 2ULL + 1ULL)
  58. # endif
  59. #endif
  60. /* The number of usable bits in an unsigned or signed integer type
  61. with minimum value MIN and maximum value MAX, as an int expression
  62. suitable in #if. Cover all known practical hosts. This
  63. implementation exploits the fact that MAX is 1 less than a power of
  64. 2, and merely counts the number of 1 bits in MAX; "COBn" means
  65. "count the number of 1 bits in the low-order n bits"). */
  66. #define _GL_INTEGER_WIDTH(min, max) (((min) < 0) + _GL_COB128 (max))
  67. #define _GL_COB128(n) (_GL_COB64 ((n) >> 31 >> 31 >> 2) + _GL_COB64 (n))
  68. #define _GL_COB64(n) (_GL_COB32 ((n) >> 31 >> 1) + _GL_COB32 (n))
  69. #define _GL_COB32(n) (_GL_COB16 ((n) >> 16) + _GL_COB16 (n))
  70. #define _GL_COB16(n) (_GL_COB8 ((n) >> 8) + _GL_COB8 (n))
  71. #define _GL_COB8(n) (_GL_COB4 ((n) >> 4) + _GL_COB4 (n))
  72. #define _GL_COB4(n) (!!((n) & 8) + !!((n) & 4) + !!((n) & 2) + !!((n) & 1))
  73. #ifndef WORD_BIT
  74. /* Assume 'int' is 32 bits wide. */
  75. # define WORD_BIT 32
  76. #endif
  77. #ifndef LONG_BIT
  78. /* Assume 'long' is 32 or 64 bits wide. */
  79. # if LONG_MAX == INT_MAX
  80. # define LONG_BIT 32
  81. # else
  82. # define LONG_BIT 64
  83. # endif
  84. #endif
  85. /* Macros specified by ISO/IEC TS 18661-1:2014. */
  86. #if (! defined ULLONG_WIDTH \
  87. && (defined _GNU_SOURCE || defined __STDC_WANT_IEC_60559_BFP_EXT__))
  88. # define CHAR_WIDTH _GL_INTEGER_WIDTH (CHAR_MIN, CHAR_MAX)
  89. # define SCHAR_WIDTH _GL_INTEGER_WIDTH (SCHAR_MIN, SCHAR_MAX)
  90. # define UCHAR_WIDTH _GL_INTEGER_WIDTH (0, UCHAR_MAX)
  91. # define SHRT_WIDTH _GL_INTEGER_WIDTH (SHRT_MIN, SHRT_MAX)
  92. # define USHRT_WIDTH _GL_INTEGER_WIDTH (0, USHRT_MAX)
  93. # define INT_WIDTH _GL_INTEGER_WIDTH (INT_MIN, INT_MAX)
  94. # define UINT_WIDTH _GL_INTEGER_WIDTH (0, UINT_MAX)
  95. # define LONG_WIDTH _GL_INTEGER_WIDTH (LONG_MIN, LONG_MAX)
  96. # define ULONG_WIDTH _GL_INTEGER_WIDTH (0, ULONG_MAX)
  97. # define LLONG_WIDTH _GL_INTEGER_WIDTH (LLONG_MIN, LLONG_MAX)
  98. # define ULLONG_WIDTH _GL_INTEGER_WIDTH (0, ULLONG_MAX)
  99. #endif /* !ULLONG_WIDTH && (_GNU_SOURCE || __STDC_WANT_IEC_60559_BFP_EXT__) */
  100. #endif /* _@GUARD_PREFIX@_LIMITS_H */
  101. #endif /* _@GUARD_PREFIX@_LIMITS_H */
  102. #endif