1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/*
* Copyright (C) 2013 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _SYS__WCHAR_LIMITS_H
#define _SYS__WCHAR_LIMITS_H
#include <android/api-level.h>
/* WCHAR_MIN / WCHAR_MAX can be defined by <stdint.h> or <wchar.h>.
* Due to historical reasons, their definition is a bit complex.
*
* - In NDK r8e and older, all definitions of WCHAR_MIN and WCHAR_MAX
* where 32-bit signed values (with one exception described below),
* despite the fact that wchar_t is 'unsigned' on ARM.
* See http://b.android.com/57749
*
* This is no longer the case, unless you define _WCHAR_IS_ALWAYS_SIGNED
* at compile time to restore the old (broken) behaviour. This doesn't
* affect other CPU ABIs.
*
* - Before API level 9, on ARM, wchar_t was typedef to 'char' when
* compiling C (not C++). Also, the definitions of WCHAR_MIN and
* WCHAR_MAX differed between <stdint.h> and <wchar.h>:
*
* <stdint.h> conditionally defined them to INT32_MIN / INT32_MAX.
* <wchar.h> conditionally defined them to 0 and 255 instead.
*
* <stdint.h> would only define WCHAR_MIN and WCHAR_MAX when:
* - Compiling C sources.
* - Compiling C++ sources with __STDC_LIMIT_MACROS being defined.
*
* <wchar.h> always ends up including <stdint.h> indirectly. This
* means that:
*
* - When compiling C sources, WCHAR_MIN / WCHAR_MAX were always
* defined as INT32_MIN / INT32_MAX.
*
* - When compiling C++ sources with __STDC_LIMIT_MACROS defined,
* they were always defined to INT32_MIN / INT32_MAX
*
* - When compiling C++ sources without __STDC_LIMIT_MACROS defined,
* they were defined by <wchar.h> as 0 and 255, respectively.
*
* Keep in mind that this was ARM-specific, only for API level < 9.
*
* If _WCHAR_IS_8BIT is defined, the same broken behaviour will
* be restored. See http://b.android.com/57267
*/
#if !defined(WCHAR_MIN)
# if defined(_WCHAR_IS_8BIT) && defined(__arm__) && __ANDROID_API__ < 9
# if defined(__cplusplus) && !defined(__STDC_LIMIT_MACROS)
# define WCHAR_MIN 0
# define WCHAR_MAX 255
# else
# define WCHAR_MIN (-2147483647 - 1)
# define WCHAR_MAX (2147483647)
# endif
# elif defined(_WCHAR_IS_ALWAYS_SIGNED)
# define WCHAR_MIN (-2147483647 - 1)
# define WCHAR_MAX (2147483647)
# else
/* Otherwise, the value is derived from the toolchain configuration.
* to avoid putting explicit CPU checks in this header. */
# ifndef __WCHAR_MAX__
# error "__WCHAR_MAX__ is not defined. Check your toolchain!"
# endif
/* Clang does define __WCHAR_MAX__, but not __WCHAR_MIN__ */
# ifndef __WCHAR_MIN__
# if __WCHAR_MAX__ == 4294967295
# define __WCHAR_MIN__ (0U)
# elif __WCHAR_MAX__ == 2147483647
# define __WCHAR_MIN__ (-2147483647 - 1)
# else
# error "Invalid __WCHAR_MAX__ value. Check your toolchain!"
# endif
# endif /* !__WCHAR_MIN__ */
# define WCHAR_MIN __WCHAR_MIN__
# define WCHAR_MAX __WCHAR_MAX__
# endif /* !_WCHAR_IS_ALWAYS_SIGNED */
#endif /* !WCHAR_MIN */
#endif /* _SYS__WCHAR_LIMITS_H */
|
