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d2890eeea1
basically multiplies its two arguments and returns SIZE_MAX if the result overflows the size_t type. Else the product of the two arguments is returned. Bump the FreeBSD_version to mitigate issues with existing implementation of array_size() in drm-devel-kmod. Discussed with: manu@ MFC after: 1 week Sponsored by: Mellanox Technologies
65 lines
2.1 KiB
C
65 lines
2.1 KiB
C
/*-
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* Copyright (c) 2020 The FreeBSD Foundation
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*
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* This software was developed by Emmanuel Vadot under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef __LINUX_OVERFLOW_H__
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#define __LINUX_OVERFLOW_H__
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#include <sys/stdint.h>
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#include <sys/types.h>
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#ifndef __has_builtin
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#define __has_builtin(x) 0
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#endif
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#if __has_builtin(__builtin_add_overflow)
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#define check_add_overflow(a, b, c) \
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__builtin_add_overflow(a, b, c)
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#else
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#error "Compiler does not support __builtin_add_overflow"
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#endif
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#if __has_builtin(__builtin_mul_overflow)
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#define check_mul_overflow(a, b, c) \
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__builtin_mul_overflow(a, b, c)
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static inline size_t
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array_size(size_t x, size_t y)
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{
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size_t retval;
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if (__builtin_mul_overflow(x, y, &retval))
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retval = SIZE_MAX;
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return (retval);
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}
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#else
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#error "Compiler does not support __builtin_mul_overflow"
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#endif
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#endif /* __LINUX_OVERFLOW_H__ */
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