| 1 | /* wchar_t type related definitions. |
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| 2 | Copyright (C) 2000-2016 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 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 |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <http://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef _BITS_WCHAR_H |
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| 20 | #define _BITS_WCHAR_H 1 |
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| 21 | |
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| 22 | /* The fallback definitions, for when __WCHAR_MAX__ or __WCHAR_MIN__ |
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| 23 | are not defined, give the right value and type as long as both int |
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| 24 | and wchar_t are 32-bit types. Adding L'\0' to a constant value |
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| 25 | ensures that the type is correct; it is necessary to use (L'\0' + |
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| 26 | 0) rather than just L'\0' so that the type in C++ is the promoted |
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| 27 | version of wchar_t rather than the distinct wchar_t type itself. |
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| 28 | Because wchar_t in preprocessor #if expressions is treated as |
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| 29 | intmax_t or uintmax_t, the expression (L'\0' - 1) would have the |
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| 30 | wrong value for WCHAR_MAX in such expressions and so cannot be used |
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| 31 | to define __WCHAR_MAX in the unsigned case. */ |
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| 32 | |
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| 33 | #ifdef __WCHAR_MAX__ |
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| 34 | # define __WCHAR_MAX __WCHAR_MAX__ |
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| 35 | #elif L'\0' - 1 > 0 |
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| 36 | # define __WCHAR_MAX (0xffffffffu + L'\0') |
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| 37 | #else |
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| 38 | # define __WCHAR_MAX (0x7fffffff + L'\0') |
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| 39 | #endif |
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| 40 | |
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| 41 | #ifdef __WCHAR_MIN__ |
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| 42 | # define __WCHAR_MIN __WCHAR_MIN__ |
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| 43 | #elif L'\0' - 1 > 0 |
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| 44 | # define __WCHAR_MIN (L'\0' + 0) |
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| 45 | #else |
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| 46 | # define __WCHAR_MIN (-__WCHAR_MAX - 1) |
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| 47 | #endif |
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| 48 | |
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| 49 | #endif /* bits/wchar.h */ |
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| 50 | |
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