1*5f757f3fSDimitry Andric /*===---- stdckdint.h - Standard header for checking integer----------------=== 2*5f757f3fSDimitry Andric * 3*5f757f3fSDimitry Andric * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*5f757f3fSDimitry Andric * See https://llvm.org/LICENSE.txt for license information. 5*5f757f3fSDimitry Andric * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*5f757f3fSDimitry Andric * 7*5f757f3fSDimitry Andric *===-----------------------------------------------------------------------=== 8*5f757f3fSDimitry Andric */ 9*5f757f3fSDimitry Andric 10*5f757f3fSDimitry Andric #ifndef __STDCKDINT_H 11*5f757f3fSDimitry Andric #define __STDCKDINT_H 12*5f757f3fSDimitry Andric 13*5f757f3fSDimitry Andric /* If we're hosted, fall back to the system's stdckdint.h. FreeBSD, for 14*5f757f3fSDimitry Andric * example, already has a Clang-compatible stdckdint.h header. 15*5f757f3fSDimitry Andric * 16*5f757f3fSDimitry Andric * The `stdckdint.h` header requires C 23 or newer. 17*5f757f3fSDimitry Andric */ 18*5f757f3fSDimitry Andric #if __STDC_HOSTED__ && __has_include_next(<stdckdint.h>) 19*5f757f3fSDimitry Andric #include_next <stdckdint.h> 20*5f757f3fSDimitry Andric #else 21*5f757f3fSDimitry Andric 22*5f757f3fSDimitry Andric /* C23 7.20.1 Defines several macros for performing checked integer arithmetic*/ 23*5f757f3fSDimitry Andric 24*5f757f3fSDimitry Andric #define __STDC_VERSION_STDCKDINT_H__ 202311L 25*5f757f3fSDimitry Andric 26*5f757f3fSDimitry Andric // Both A and B shall be any integer type other than "plain" char, bool, a bit- 27*5f757f3fSDimitry Andric // precise integer type, or an enumerated type, and they need not be the same. 28*5f757f3fSDimitry Andric 29*5f757f3fSDimitry Andric // R shall be a modifiable lvalue of any integer type other than "plain" char, 30*5f757f3fSDimitry Andric // bool, a bit-precise integer type, or an enumerated type. It shouldn't be 31*5f757f3fSDimitry Andric // short type, either. Otherwise, it may be unable to hold two the result of 32*5f757f3fSDimitry Andric // operating two 'int's. 33*5f757f3fSDimitry Andric 34*5f757f3fSDimitry Andric // A diagnostic message will be produced if A or B are not suitable integer 35*5f757f3fSDimitry Andric // types, or if R is not a modifiable lvalue of a suitable integer type or R 36*5f757f3fSDimitry Andric // is short type. 37*5f757f3fSDimitry Andric #define ckd_add(R, A, B) __builtin_add_overflow((A), (B), (R)) 38*5f757f3fSDimitry Andric #define ckd_sub(R, A, B) __builtin_sub_overflow((A), (B), (R)) 39*5f757f3fSDimitry Andric #define ckd_mul(R, A, B) __builtin_mul_overflow((A), (B), (R)) 40*5f757f3fSDimitry Andric 41*5f757f3fSDimitry Andric #endif /* __STDC_HOSTED__ */ 42*5f757f3fSDimitry Andric #endif /* __STDCKDINT_H */ 43