Internal
Public Access
124 lines
4.7 KiB
C
124 lines
4.7 KiB
C
/**
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* WinPR: Windows Portable Runtime
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* Cast macros
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*
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* Copyright 2024 Armin Novak <anovak@thincast.com>
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* Copyright 2024 Thincast Technologies GmbH
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <stdint.h>
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#include <winpr/assert-api.h>
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/**
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* @brief C++ safe cast macro
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* @since version 3.10.1
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*/
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#ifdef __cplusplus
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#define WINPR_CXX_COMPAT_CAST(t, val) static_cast<t>(val)
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#else
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#define WINPR_CXX_COMPAT_CAST(t, val) (t)(val)
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#endif
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#if defined(__GNUC__) || defined(__clang__)
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/**
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* @brief A macro to do dirty casts. Do not use without a good justification!
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* @param ptr The pointer to cast
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* @param dstType The data type to cast to
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* @return The casted pointer
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* @since version 3.9.0
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*/
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#define WINPR_REINTERPRET_CAST(ptr, srcType, dstType) \
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__extension__({ \
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union \
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{ \
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srcType src; \
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dstType dst; \
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} cnv; \
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WINPR_STATIC_ASSERT(sizeof(srcType) == sizeof(dstType)); \
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cnv.src = ptr; \
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cnv.dst; \
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})
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/**
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* @brief A macro to do dirty casts. Do not use without a good justification!
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* @param ptr The pointer to cast
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* @param dstType The data type to cast to
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* @return The casted pointer
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* @since version 3.9.0
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*/
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#define WINPR_CAST_CONST_PTR_AWAY(ptr, dstType) \
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__extension__({ \
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union \
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{ \
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__typeof(ptr) src; \
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dstType dst; \
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} cnv; \
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cnv.src = ptr; \
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cnv.dst; \
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})
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/**
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* @brief A macro to do function pointer casts. Do not use without a good justification!
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* @param ptr The pointer to cast
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* @param dstType The data type to cast to
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* @return The casted pointer
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* @since version 3.9.0
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*/
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#define WINPR_FUNC_PTR_CAST(ptr, dstType) \
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__extension__({ \
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union \
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{ \
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__typeof(ptr) src; \
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dstType dst; \
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} cnv; \
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WINPR_STATIC_ASSERT(sizeof(dstType) == sizeof(__typeof(ptr))); \
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cnv.src = ptr; \
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cnv.dst; \
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})
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#else
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#define WINPR_REINTERPRET_CAST(ptr, srcType, dstType) (dstType) ptr
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#define WINPR_CAST_CONST_PTR_AWAY(ptr, dstType) (dstType) ptr
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#define WINPR_FUNC_PTR_CAST(ptr, dstType) (dstType)(uintptr_t) ptr
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#endif
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#if defined(__GNUC__) || defined(__clang__)
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/**
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* @brief A macro to do checked integer casts.
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* will check if the value does change by casting to and from the target type and comparing the
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* values. will also check if the sign of a value changes during conversion.
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*
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* @param type the type to cast to
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* @param var the integer of unknown type to cast
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* @return The casted integer
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* @since version 3.10.1
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*/
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#define WINPR_ASSERTING_INT_CAST(type, ivar) \
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__extension__({ \
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__typeof(ivar) var = ivar; \
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WINPR_ASSERT((var) == \
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WINPR_CXX_COMPAT_CAST(__typeof(var), WINPR_CXX_COMPAT_CAST(type, (var)))); \
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WINPR_ASSERT((((var) > 0) && (WINPR_CXX_COMPAT_CAST(type, (var)) > 0)) || \
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(((var) <= 0) && WINPR_CXX_COMPAT_CAST(type, (var)) <= 0)); \
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WINPR_CXX_COMPAT_CAST(type, (var)); \
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})
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#else
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#define WINPR_ASSERTING_INT_CAST(type, var) WINPR_CXX_COMPAT_CAST(type, var)
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#endif
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