Function 68, subfunction 20 - reallocate memory block.

• eax = 68 - function number
• ebx = 20 - subfunction number
• ecx = new size in bytes
• edx = pointer to already allocated block

• eax = pointer to the reallocated block, 0 = error

• Before this call one must initialize process heap by call to subfunction 11.
• The function allocates an integer number of pages (4 Kb) in such way that the real size of allocated block is more than or equal to requested size.
• If edx=0, the function call is equivalent to memory allocation with subfunction 12. Otherwise the block at edx must be allocated earlier with subfunction 12 or this subfunction.
• If ecx=0, the function frees memory block at edx and returns 0.
• The contents of the block are unchanged up to the shorter of the new and old sizes.