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src/cbor/internal/memory_utils.h
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spaette
typos
28 дек 2023, 01:31
28 дек 2023, 01:31
4b422b1
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/* * Copyright (c) 2014-2020 Pavel Kalvoda <me@pavelkalvoda.com> * * libcbor is free software; you can redistribute it and/or modify * it under the terms of the MIT license. See LICENSE for details. */ #ifndef LIBCBOR_MEMORY_UTILS_H #define LIBCBOR_MEMORY_UTILS_H #include <stdbool.h> #include <string.h> #include "cbor/common.h" /** Can `a` and `b` be multiplied without overflowing size_t? */ _CBOR_NODISCARD bool _cbor_safe_to_multiply(size_t a, size_t b); /** Can `a` and `b` be added without overflowing size_t? */ _CBOR_NODISCARD bool _cbor_safe_to_add(size_t a, size_t b); /** Adds `a` and `b`, propagating zeros and returning 0 on overflow. */ _CBOR_NODISCARD size_t _cbor_safe_signaling_add(size_t a, size_t b); /** Overflow-proof contiguous array allocation * * @param item_size * @param item_count * @return Region of item_size * item_count bytes, or NULL if the total size * overflows size_t or the underlying allocator failed */ void* _cbor_alloc_multiple(size_t item_size, size_t item_count); /** Overflow-proof contiguous array reallocation * * This implements the OpenBSD `reallocarray` functionality. * * @param pointer * @param item_size * @param item_count * @return Realloc'd of item_size * item_count bytes, or NULL if the total size * overflows size_t or the underlying allocator failed */ void* _cbor_realloc_multiple(void* pointer, size_t item_size, size_t item_count); #endif // LIBCBOR_MEMORY_UTILS_H