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#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <kernel/heapmgr.H>
#include <kernel/pagemgr.H>
void* malloc(size_t s)
{
if (s > HeapManager::MAX_ALLOC_SIZE)
{
size_t pages = (s + 8 + (PAGESIZE - 1))
/ PAGESIZE;
void* v = PageManager::allocatePage(pages);
size_t* len = (size_t*)v;
*len = pages << 8;
len++;
return len;
}
else
return HeapManager::allocate(s);
}
void free(void* p)
{
if (NULL == p) return;
size_t* len = (size_t*)p;
len--;
if ((*len) > 0xff)
{
PageManager::freePage(len, (*len) >> 8);
}
else
{
HeapManager::free(p);
}
}
void* realloc(void* p, size_t s)
{
if (NULL == p) return malloc(s);
size_t* len = (size_t*)p;
len--;
size_t cur_size;
if ((*len) > 0xff)
{
cur_size = ((*len) >> 8) * PAGESIZE - 8;
}
else
{
cur_size = (1 << (*len + 4)) - 8;
}
if (s <= cur_size)
return p;
void* new_p = malloc(s);
memcpy(new_p, p, cur_size);
free(p);
return new_p;
}
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