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417bafec | 1 | /* wchar_t type related definitions. |
04277e02 | 2 | Copyright (C) 2000-2019 Free Software Foundation, Inc. |
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3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
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6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
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9 | |
10 | The GNU C Library 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 GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
417bafec | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
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18 | |
19 | #ifndef _BITS_WCHAR_H | |
20 | #define _BITS_WCHAR_H 1 | |
21 | ||
052aff95 JM |
22 | /* The fallback definitions, for when __WCHAR_MAX__ or __WCHAR_MIN__ |
23 | are not defined, give the right value and type as long as both int | |
24 | and wchar_t are 32-bit types. Adding L'\0' to a constant value | |
25 | ensures that the type is correct; it is necessary to use (L'\0' + | |
26 | 0) rather than just L'\0' so that the type in C++ is the promoted | |
27 | version of wchar_t rather than the distinct wchar_t type itself. | |
28 | Because wchar_t in preprocessor #if expressions is treated as | |
29 | intmax_t or uintmax_t, the expression (L'\0' - 1) would have the | |
30 | wrong value for WCHAR_MAX in such expressions and so cannot be used | |
31 | to define __WCHAR_MAX in the unsigned case. */ | |
32 | ||
33 | #ifdef __WCHAR_MAX__ | |
34 | # define __WCHAR_MAX __WCHAR_MAX__ | |
35 | #elif L'\0' - 1 > 0 | |
36 | # define __WCHAR_MAX (0xffffffffu + L'\0') | |
37 | #else | |
38 | # define __WCHAR_MAX (0x7fffffff + L'\0') | |
39 | #endif | |
40 | ||
41 | #ifdef __WCHAR_MIN__ | |
42 | # define __WCHAR_MIN __WCHAR_MIN__ | |
43 | #elif L'\0' - 1 > 0 | |
44 | # define __WCHAR_MIN (L'\0' + 0) | |
45 | #else | |
46 | # define __WCHAR_MIN (-__WCHAR_MAX - 1) | |
47 | #endif | |
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48 | |
49 | #endif /* bits/wchar.h */ |