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[glibc.git] / include / limits.h
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1 /* Copyright (C) 1991, 92, 96, 97, 98, 99, 2000 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
20 * ISO C99 Standard: 7.10/5.2.4.2.1 Sizes of integer types <limits.h>
23 #ifndef _LIBC_LIMITS_H_
24 #define _LIBC_LIMITS_H_ 1
26 #include <features.h>
29 /* Maximum length of any multibyte character in any locale.
30 We define this value here since the gcc header does not define
31 the correct value. */
32 #define MB_LEN_MAX 16
35 /* If we are not using GNU CC we have to define all the symbols ourself.
36 Otherwise use gcc's definitions (see below). */
37 #if !defined __GNUC__ || __GNUC__ < 2
39 /* We only protect from multiple inclusion here, because all the other
40 #include's protect themselves, and in GCC 2 we may #include_next through
41 multiple copies of this file before we get to GCC's. */
42 # ifndef _LIMITS_H
43 # define _LIMITS_H 1
45 #include <bits/wordsize.h>
47 /* We don't have #include_next.
48 Define ANSI <limits.h> for standard 32-bit words. */
50 /* These assume 8-bit `char's, 16-bit `short int's,
51 and 32-bit `int's and `long int's. */
53 /* Number of bits in a `char'. */
54 # define CHAR_BIT 8
56 /* Minimum and maximum values a `signed char' can hold. */
57 # define SCHAR_MIN (-128)
58 # define SCHAR_MAX 127
60 /* Maximum value an `unsigned char' can hold. (Minimum is 0.) */
61 # define UCHAR_MAX 255
63 /* Minimum and maximum values a `char' can hold. */
64 # ifdef __CHAR_UNSIGNED__
65 # define CHAR_MIN 0
66 # define CHAR_MAX UCHAR_MAX
67 # else
68 # define CHAR_MIN SCHAR_MIN
69 # define CHAR_MAX SCHAR_MAX
70 # endif
72 /* Minimum and maximum values a `signed short int' can hold. */
73 # define SHRT_MIN (-32768)
74 # define SHRT_MAX 32767
76 /* Maximum value an `unsigned short int' can hold. (Minimum is 0.) */
77 # define USHRT_MAX 65535
79 /* Minimum and maximum values a `signed int' can hold. */
80 # define INT_MIN (-INT_MAX - 1)
81 # define INT_MAX 2147483647
83 /* Maximum value an `unsigned int' can hold. (Minimum is 0.) */
84 # define UINT_MAX 4294967295U
86 /* Minimum and maximum values a `signed long int' can hold. */
87 # if __WORDSIZE == 64
88 # define LONG_MAX 9223372036854775807L
89 # else
90 # define LONG_MAX 2147483647L
91 # endif
92 # define LONG_MIN (-LONG_MAX - 1L)
94 /* Maximum value an `unsigned long int' can hold. (Minimum is 0.) */
95 # if __WORDSIZE == 64
96 # define ULONG_MAX 18446744073709551615UL
97 # else
98 # define ULONG_MAX 4294967295UL
99 # endif
101 # ifdef __USE_ISOC99
103 /* Minimum and maximum values a `signed long long int' can hold. */
104 # define LLONG_MAX 9223372036854775807LL
105 # define LLONG_MIN (-LLONG_MAX - 1LL)
107 /* Maximum value an `unsigned long long int' can hold. (Minimum is 0.) */
108 # define ULLONG_MAX 18446744073709551615ULL
110 # endif /* ISO C99 */
112 # endif /* limits.h */
113 #endif /* GCC 2. */
115 #endif /* !_LIBC_LIMITS_H_ */
117 /* Get the compiler's limits.h, which defines almost all the ISO constants.
119 We put this #include_next outside the double inclusion check because
120 it should be possible to include this file more than once and still get
121 the definitions from gcc's header. */
122 #if defined __GNUC__ && !defined _GCC_LIMITS_H_
123 /* `_GCC_LIMITS_H_' is what GCC's file defines. */
124 # include_next <limits.h>
126 /* The <limits.h> files in some gcc versions don't define LLONG_MIN,
127 LLONG_MAX, and ULLONG_MAX. Instead only the values gcc defined for
128 ages are available. */
129 # ifdef __USE_ISOC99
130 # ifndef LLONG_MIN
131 # define LLONG_MIN LONG_LONG_MIN
132 # endif
133 # ifndef LLONG_MAX
134 # define LLONG_MAX LONG_LONG_MAX
135 # endif
136 # ifndef ULLONG_MAX
137 # define ULLONG_MAX ULONG_LONG_MAX
138 # endif
139 # endif
140 #endif
142 #ifdef __USE_POSIX
143 /* POSIX adds things to <limits.h>. */
144 # include <bits/posix1_lim.h>
145 #endif
147 #ifdef __USE_POSIX2
148 # include <bits/posix2_lim.h>
149 #endif
151 #ifdef __USE_XOPEN
152 # include <bits/xopen_lim.h>
153 #endif