derek.holloway
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43 lines
1.6 KiB
C
43 lines
1.6 KiB
C
/*===---- stdckdint.h - Standard header for checking integer----------------===
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*
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* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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* See https://llvm.org/LICENSE.txt for license information.
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* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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*
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*===-----------------------------------------------------------------------===
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*/
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#ifndef __STDCKDINT_H
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#define __STDCKDINT_H
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/* If we're hosted, fall back to the system's stdckdint.h. FreeBSD, for
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* example, already has a Clang-compatible stdckdint.h header.
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*
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* The `stdckdint.h` header requires C 23 or newer.
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*/
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#if __STDC_HOSTED__ && __has_include_next(<stdckdint.h>)
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#include_next <stdckdint.h>
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#else
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/* C23 7.20.1 Defines several macros for performing checked integer arithmetic*/
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#define __STDC_VERSION_STDCKDINT_H__ 202311L
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// Both A and B shall be any integer type other than "plain" char, bool, a bit-
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// precise integer type, or an enumerated type, and they need not be the same.
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// R shall be a modifiable lvalue of any integer type other than "plain" char,
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// bool, a bit-precise integer type, or an enumerated type. It shouldn't be
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// short type, either. Otherwise, it may be unable to hold two the result of
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// operating two 'int's.
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// A diagnostic message will be produced if A or B are not suitable integer
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// types, or if R is not a modifiable lvalue of a suitable integer type or R
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// is short type.
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#define ckd_add(R, A, B) __builtin_add_overflow((A), (B), (R))
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#define ckd_sub(R, A, B) __builtin_sub_overflow((A), (B), (R))
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#define ckd_mul(R, A, B) __builtin_mul_overflow((A), (B), (R))
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#endif /* __STDC_HOSTED__ */
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#endif /* __STDCKDINT_H */
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