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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354//// calloc_base.cpp//// Copyright (c) Microsoft Corporation. All rights reserved.//// Implementation of _calloc_base(). This is defined in a different source file// from the calloc() function to allow calloc() to be replaced by the user.//#include <corecrt_internal.h>#include <malloc.h>#include <new.h>
// This function implements the logic of calloc().//// This function must be marked noinline, otherwise calloc and// _calloc_base will have identical COMDATs, and the linker will fold// them when calling one from the CRT. This is necessary because calloc// needs to support users patching in custom implementations.extern "C" __declspec(noinline) _CRTRESTRICT void* __cdecl _calloc_base( size_t const count, size_t const size ){ // Ensure that (count * size) does not overflow _VALIDATE_RETURN_NOEXC(count == 0 || (_HEAP_MAXREQ / count) >= size, ENOMEM, nullptr);
// Ensure that we allocate a nonzero block size: size_t const requested_block_size = count * size; size_t const actual_block_size = requested_block_size == 0 ? 1 : requested_block_size;
for (;;) { void* const block = HeapAlloc(__acrt_heap, HEAP_ZERO_MEMORY, actual_block_size);
// If allocation succeeded, return the pointer to the new block: if (block) { return block; }
// Otherwise, see if we need to call the new handler, and if so call it. // If the new handler fails, just return nullptr: if (_query_new_mode() == 0 || !_callnewh(actual_block_size)) { errno = ENOMEM; return nullptr; }
// The new handler was successful; try to allocate aagain... }}