xref: /illumos-gate/usr/src/uts/common/sys/int_limits.h (revision ba3594ba)
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 */
270