51 lines
1.1 KiB
C++
51 lines
1.1 KiB
C++
/*
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* \brief Mini C malloc() and free()
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* \author Norman Feske
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* \date 2006-07-21
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*/
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/*
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* Copyright (C) 2006-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#include <base/env.h>
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#include <util/string.h>
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using namespace Genode;
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extern "C" void *malloc(unsigned size)
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{
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/*
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* We store the size of the allocation at the very
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* beginning of the allocated block and return
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* the subsequent address. This way, we can retrieve
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* the size information when freeing the block.
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*/
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unsigned long real_size = size + sizeof(unsigned long);
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void *addr = 0;
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if (!env()->heap()->alloc(real_size, &addr))
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return 0;
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*(unsigned long *)addr = real_size;
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return (unsigned long *)addr + 1;
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}
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extern "C" void *calloc(unsigned nmemb, unsigned size)
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{
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void *addr = malloc(nmemb*size);
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memset(addr, 0, nmemb*size);
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return addr;
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}
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extern "C" void free(void *ptr)
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{
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unsigned long *addr = ((unsigned long *)ptr) - 1;
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env()->heap()->free(addr, *addr);
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}
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