usr/src/uts/common/sys/int_limits.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
  24  *
  25  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28
  29 #ifndef _SYS_INT_LIMITS_H
  30 #define _SYS_INT_LIMITS_H
  31
  32 /*
  33  * This file, <sys/int_limits.h>, is part of the Sun Microsystems implementation
  34  * of <inttypes.h> as defined in the ISO C standard, ISO/IEC 9899:1999
  35  * Programming language - C.
  36  *
  37  * Programs/Modules should not directly include this file.  Access to the
  38  * types defined in this file should be through the inclusion of one of the
  39  * following files:
  40  *
  41  *      <limits.h>              This nested inclusion is disabled for strictly
  42  *                              ANSI-C conforming compilations.  The *_MIN
  43  *                              definitions are not visible to POSIX or XPG
  44  *                              conforming applications (due to what may be
  45  *                              a bug in the specification - this is under
  46  *                              investigation)
  47  *
  48  *      <sys/inttypes.h>        Provides the Kernel and Driver appropriate
  49  *                              components of <inttypes.h>.
  50  *
  51  *      <inttypes.h>            For use by applications.
  52  *
  53  * See these files for more details.
  54  */
  55
  56 #include <sys/feature_tests.h>
  57
  58 #ifdef __cplusplus
  59 extern "C" {
  60 #endif
  61
  62 /*
  63  * Limits
  64  *
  65  * The following define the limits for the types defined in <sys/int_types.h>.
  66  *
  67  * INTMAX_MIN (minimum value of the largest supported signed integer type),
  68  * INTMAX_MAX (maximum value of the largest supported signed integer type),
  69  * and UINTMAX_MAX (maximum value of the largest supported unsigned integer
  70  * type) can be set to implementation defined limits.
  71  *
  72  * NOTE : A programmer can test to see whether an implementation supports
  73  * a particular size of integer by testing if the macro that gives the
  74  * maximum for that datatype is defined. For example, if #ifdef UINT64_MAX
  75  * tests false, the implementation does not support unsigned 64 bit integers.
  76  *
  77  * The type of these macros is intentionally unspecified.
  78  *
  79  * The types int8_t, int_least8_t, and int_fast8_t are not defined for ISAs
  80  * where the ABI specifies "char" as unsigned when the translation mode is
  81  * not ANSI-C.
  82  */
  83 #define INT8_MAX        (127)
  84 #define INT16_MAX       (32767)
  85 #define INT32_MAX       (2147483647)
  86 #if defined(_LP64)
  87 #define INT64_MAX       (9223372036854775807L)
  88 #elif defined(_LONGLONG_TYPE)
  89 #define INT64_MAX       (9223372036854775807LL)
  90 #endif
  91
  92 #define UINT8_MAX       (255U)
  93 #define UINT16_MAX      (65535U)
  94 #define UINT32_MAX      (4294967295U)
  95 #if defined(_LP64)
  96 #define UINT64_MAX      (18446744073709551615UL)
  97 #elif defined(_LONGLONG_TYPE)
  98 #define UINT64_MAX      (18446744073709551615ULL)
  99 #endif
 100
 101 #ifdef INT64_MAX
 102 #define INTMAX_MAX      INT64_MAX
 103 #else
 104 #define INTMAX_MAX      INT32_MAX
 105 #endif
 106
 107 #ifdef UINT64_MAX
 108 #define UINTMAX_MAX     UINT64_MAX
 109 #else
 110 #define UINTMAX_MAX     UINT32_MAX
 111 #endif
 112
 113 #define INT_LEAST8_MAX  INT8_MAX
 114 #define INT_LEAST16_MAX INT16_MAX
 115 #define INT_LEAST32_MAX INT32_MAX
 116 #ifdef INT64_MAX
 117 #define INT_LEAST64_MAX INT64_MAX
 118 #endif
 119
 120 #define UINT_LEAST8_MAX UINT8_MAX
 121 #define UINT_LEAST16_MAX UINT16_MAX
 122 #define UINT_LEAST32_MAX UINT32_MAX
 123 #ifdef UINT64_MAX
 124 #define UINT_LEAST64_MAX UINT64_MAX
 125 #endif
 126
 127 #define INT_FAST8_MAX   INT8_MAX
 128 #define INT_FAST16_MAX INT16_MAX
 129 #define INT_FAST32_MAX INT32_MAX
 130 #ifdef INT64_MAX
 131 #define INT_FAST64_MAX INT64_MAX
 132 #endif
 133
 134 #define UINT_FAST8_MAX  UINT8_MAX
 135 #define UINT_FAST16_MAX UINT16_MAX
 136 #define UINT_FAST32_MAX UINT32_MAX
 137 #ifdef UINT64_MAX
 138 #define UINT_FAST64_MAX UINT64_MAX
 139 #endif
 140
 141 /*
 142  * The following 2 macros are provided for testing whether the types
 143  * intptr_t and uintptr_t (integers large enough to hold a void *) are
 144  * defined in this header. They are needed in case the architecture can't
 145  * represent a pointer in any standard integral type.
 146  */
 147 #if defined(_LP64) || defined(_I32LPx)
 148 #define INTPTR_MAX      INT64_MAX
 149 #define UINTPTR_MAX     UINT64_MAX
 150 #else
 151 #define INTPTR_MAX      INT32_MAX
 152 #define UINTPTR_MAX     UINT32_MAX
 153 #endif
 154
 155 /* Maximum limits of ptrdiff_t defined in <sys/types.h> */
 156 #if defined(_LP64) || defined(_I32LPx)
 157 #define PTRDIFF_MAX     9223372036854775807L
 158 #else
 159 #define PTRDIFF_MAX     2147483647
 160 #endif
 161
 162 /*
 163  * Maximum value of a "size_t".  SIZE_MAX was previously defined
 164  * in <limits.h>, however, the standards specify it be defined
 165  * in <stdint.h>. The <stdint.h> headers includes this header as
 166  * does <limits.h>. The value of SIZE_MAX should not deviate
 167  * from the value of ULONG_MAX defined <sys/types.h>.
 168  */
 169 #if defined(_LP64)
 170 #define SIZE_MAX        18446744073709551615UL
 171 #else
 172 #define SIZE_MAX        4294967295UL
 173 #endif
 174
 175 /* Maximum limit of sig_atomic_t defined in <sys/types.h> */
 176 #ifndef SIG_ATOMIC_MAX
 177 #define SIG_ATOMIC_MAX  2147483647
 178 #endif
 179
 180 /*
 181  * Maximum limit of wchar_t. The WCHAR_* macros are also
 182  * defined in <iso/wchar_iso.h>, but inclusion of that header
 183  * will break ISO/IEC C namespace.
 184  */
 185 #ifndef WCHAR_MAX
 186 #define WCHAR_MAX       2147483647
 187 #endif
 188
 189 /* Maximum limit of wint_t */
 190 #ifndef WINT_MAX
 191 #define WINT_MAX        2147483647
 192 #endif
 193
 194 /*
 195  * It is probably a bug in the POSIX specification (IEEE-1003.1-1990) that
 196  * when including <limits.h> that the suffix _MAX is reserved but not the
 197  * suffix _MIN.  However, until that issue is resolved....
 198  */
 199 #if defined(__EXTENSIONS__) || !defined(__XOPEN_OR_POSIX) || defined(_XPG6)
 200
 201 #define INT8_MIN        (-128)
 202 #define INT16_MIN       (-32767-1)
 203 #define INT32_MIN       (-2147483647-1)
 204 #if defined(_LP64)
 205 #define INT64_MIN       (-9223372036854775807L-1)
 206 #elif defined(_LONGLONG_TYPE)
 207 #define INT64_MIN       (-9223372036854775807LL-1)
 208 #endif
 209
 210 #ifdef INT64_MIN
 211 #define INTMAX_MIN      INT64_MIN
 212 #else
 213 #define INTMAX_MIN      INT32_MIN
 214 #endif
 215
 216 #define INT_LEAST8_MIN  INT8_MIN
 217 #define INT_LEAST16_MIN INT16_MIN
 218 #define INT_LEAST32_MIN INT32_MIN
 219 #ifdef INT64_MIN
 220 #define INT_LEAST64_MIN INT64_MIN
 221 #endif
 222
 223 #define INT_FAST8_MIN   INT8_MIN
 224 #define INT_FAST16_MIN  INT16_MIN
 225 #define INT_FAST32_MIN INT32_MIN
 226 #ifdef INT64_MIN
 227 #define INT_FAST64_MIN  INT64_MIN
 228 #endif
 229
 230 /* Minimum value of a pointer-holding signed integer type */
 231 #if defined(_LP64) || defined(_I32LPx)
 232 #define INTPTR_MIN      INT64_MIN
 233 #else
 234 #define INTPTR_MIN      INT32_MIN
 235 #endif
 236
 237 /* Minimum limits of ptrdiff_t defined in <sys/types.h> */
 238 #if defined(_LP64) || defined(_I32LPx)
 239 #define PTRDIFF_MIN     (-9223372036854775807L-1L)
 240 #else
 241 #define PTRDIFF_MIN     (-2147483647-1)
 242 #endif
 243
 244 /* Minimum limit of sig_atomic_t defined in <sys/types.h> */
 245 #ifndef SIG_ATOMIC_MIN
 246 #define SIG_ATOMIC_MIN  (-2147483647-1)
 247 #endif
 248
 249 /*
 250  * Minimum limit of wchar_t. The WCHAR_* macros are also
 251  * defined in <iso/wchar_iso.h>, but inclusion of that header
 252  * will break ISO/IEC C namespace.
 253  */
 254 #ifndef WCHAR_MIN
 255 #define WCHAR_MIN       (-2147483647-1)
 256 #endif
 257
 258 /* Minimum limit of wint_t */
 259 #ifndef WINT_MIN
 260 #define WINT_MIN        (-2147483647-1)
 261 #endif
 262
 263 #endif  /* defined(__EXTENSIONS__) || !defined(__XOPEN_OR_POSIX) ... */
 264
 265 #ifdef __cplusplus
 266 }
 267 #endif
 268
 269 #endif /* _SYS_INT_LIMITS_H */