Listing 5 Synthesizing malloc(), realloc(), and free()

/* /////////////////////////////////////////////////////////////
 * ...
 *
 * Extract from malloc.c
 *
 * Copyright (C) 2002, Synesis Software Pty Ltd.
 * (Licensed under the Synesis Software Standard Source License:
 *  http://www.synesis.com.au/licenses/ssssl.html)
 *
 * ...
 * ////////////////////////////////////////////////////////// */

void *malloc(size_t si)
{
    return HeapAlloc(GetProcessHeap(), 0, si);
}

void free(void *pv)
{
    HeapFree(GetProcessHeap(), 0, pv);
}

void *realloc(void *pv, size_t si)
{
    void    *pvNew;

    if(pv == NULL)
    {
        pvNew = malloc(si);
    }
    else
    {
        if(si == 0)
        {
            free(pv);

            pvNew = NULL;
        }
        else
        {
            pvNew = HeapRealloc(GetProcessHeap(), 0, pv, si);
        }
    }

    return pvNew;
}