1 /* A GNU-like <limits.h>.
2 
3    Copyright 2016-2021 Free Software Foundation, Inc.
4 
5    This program is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public License
7    as published by the Free Software Foundation; either version 2, or
8    (at your option) any later version.
9 
10    This program is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13    GNU Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser General Public License
16    along with this program; if not, see <https://www.gnu.org/licenses/>.  */
17 
18 #if __GNUC__ >= 3
19 @PRAGMA_SYSTEM_HEADER@
20 #endif
21 @PRAGMA_COLUMNS@
22 
23 #if defined _GL_ALREADY_INCLUDING_LIMITS_H
24 /* Special invocation convention:
25    On Haiku/x86_64, we have a sequence of nested includes
26    <limits.h> -> <syslimits.h> -> <limits.h>.
27    In this situation, LONG_MAX and INT_MAX are not yet defined,
28    therefore we should not attempt to define LONG_BIT.  */
29 
30 #@INCLUDE_NEXT@ @NEXT_LIMITS_H@
31 
32 #else
33 /* Normal invocation convention.  */
34 
35 #ifndef _@GUARD_PREFIX@_LIMITS_H
36 
37 # define _GL_ALREADY_INCLUDING_LIMITS_H
38 
39 /* The include_next requires a split double-inclusion guard.  */
40 # @INCLUDE_NEXT@ @NEXT_LIMITS_H@
41 
42 # undef _GL_ALREADY_INCLUDING_LIMITS_H
43 
44 #ifndef _@GUARD_PREFIX@_LIMITS_H
45 #define _@GUARD_PREFIX@_LIMITS_H
46 
47 #ifndef LLONG_MIN
48 # if defined LONG_LONG_MIN /* HP-UX 11.31 */
49 #  define LLONG_MIN LONG_LONG_MIN
50 # elif defined LONGLONG_MIN /* IRIX 6.5 */
51 #  define LLONG_MIN LONGLONG_MIN
52 # elif defined __GNUC__
53 #  define LLONG_MIN (- __LONG_LONG_MAX__ - 1LL)
54 # endif
55 #endif
56 #ifndef LLONG_MAX
57 # if defined LONG_LONG_MAX /* HP-UX 11.31 */
58 #  define LLONG_MAX LONG_LONG_MAX
59 # elif defined LONGLONG_MAX /* IRIX 6.5 */
60 #  define LLONG_MAX LONGLONG_MAX
61 # elif defined __GNUC__
62 #  define LLONG_MAX __LONG_LONG_MAX__
63 # endif
64 #endif
65 #ifndef ULLONG_MAX
66 # if defined ULONG_LONG_MAX /* HP-UX 11.31 */
67 #  define ULLONG_MAX ULONG_LONG_MAX
68 # elif defined ULONGLONG_MAX /* IRIX 6.5 */
69 #  define ULLONG_MAX ULONGLONG_MAX
70 # elif defined __GNUC__
71 #  define ULLONG_MAX (__LONG_LONG_MAX__ * 2ULL + 1ULL)
72 # endif
73 #endif
74 
75 /* The number of usable bits in an unsigned or signed integer type
76    with minimum value MIN and maximum value MAX, as an int expression
77    suitable in #if.  Cover all known practical hosts.  This
78    implementation exploits the fact that MAX is 1 less than a power of
79    2, and merely counts the number of 1 bits in MAX; "COBn" means
80    "count the number of 1 bits in the low-order n bits").  */
81 #define _GL_INTEGER_WIDTH(min, max) (((min) < 0) + _GL_COB128 (max))
82 #define _GL_COB128(n) (_GL_COB64 ((n) >> 31 >> 31 >> 2) + _GL_COB64 (n))
83 #define _GL_COB64(n) (_GL_COB32 ((n) >> 31 >> 1) + _GL_COB32 (n))
84 #define _GL_COB32(n) (_GL_COB16 ((n) >> 16) + _GL_COB16 (n))
85 #define _GL_COB16(n) (_GL_COB8 ((n) >> 8) + _GL_COB8 (n))
86 #define _GL_COB8(n) (_GL_COB4 ((n) >> 4) + _GL_COB4 (n))
87 #define _GL_COB4(n) (!!((n) & 8) + !!((n) & 4) + !!((n) & 2) + !!((n) & 1))
88 
89 #ifndef WORD_BIT
90 /* Assume 'int' is 32 bits wide.  */
91 # define WORD_BIT 32
92 #endif
93 #ifndef LONG_BIT
94 /* Assume 'long' is 32 or 64 bits wide.  */
95 # if LONG_MAX == INT_MAX
96 #  define LONG_BIT 32
97 # else
98 #  define LONG_BIT 64
99 # endif
100 #endif
101 
102 /* Macros specified by ISO/IEC TS 18661-1:2014.  */
103 
104 #if (! defined ULLONG_WIDTH                                             \
105      && (defined _GNU_SOURCE || defined __STDC_WANT_IEC_60559_BFP_EXT__))
106 # define CHAR_WIDTH _GL_INTEGER_WIDTH (CHAR_MIN, CHAR_MAX)
107 # define SCHAR_WIDTH _GL_INTEGER_WIDTH (SCHAR_MIN, SCHAR_MAX)
108 # define UCHAR_WIDTH _GL_INTEGER_WIDTH (0, UCHAR_MAX)
109 # define SHRT_WIDTH _GL_INTEGER_WIDTH (SHRT_MIN, SHRT_MAX)
110 # define USHRT_WIDTH _GL_INTEGER_WIDTH (0, USHRT_MAX)
111 # define INT_WIDTH _GL_INTEGER_WIDTH (INT_MIN, INT_MAX)
112 # define UINT_WIDTH _GL_INTEGER_WIDTH (0, UINT_MAX)
113 # define LONG_WIDTH _GL_INTEGER_WIDTH (LONG_MIN, LONG_MAX)
114 # define ULONG_WIDTH _GL_INTEGER_WIDTH (0, ULONG_MAX)
115 # define LLONG_WIDTH _GL_INTEGER_WIDTH (LLONG_MIN, LLONG_MAX)
116 # define ULLONG_WIDTH _GL_INTEGER_WIDTH (0, ULLONG_MAX)
117 #endif /* !ULLONG_WIDTH && (_GNU_SOURCE || __STDC_WANT_IEC_60559_BFP_EXT__) */
118 
119 #endif /* _@GUARD_PREFIX@_LIMITS_H */
120 #endif /* _@GUARD_PREFIX@_LIMITS_H */
121 #endif
122