advanced.cpp

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/*
 * LibraryHacks.cpp
 *
 *  Created on: 23 Jan 2011
 *      Author: Andy
 */

#include <sys/types.h>

#include <cstdlib>

/*
 * The default pulls in 70K of garbage
 */

namespace __gnu_cxx
{
void __verbose_terminate_handler()
{
  for (;;)
    ;
}
} // namespace __gnu_cxx

/*
 * The default pulls in about 12K of garbage
 */

extern "C" void __cxa_pure_virtual()
{
  for (;;)
    ;
}

/*
 * Implement C++ new/delete operators using the heap
 */

void *operator new(size_t size)
{
  return malloc(size);
}

void *operator new[](size_t size)
{
  return malloc(size);
}

void operator delete(void *p)
{
  free(p);
}

void operator delete[](void *p)
{
  free(p);
}

/*
 * sbrk function for getting space for malloc and friends
 */

extern int _end;

extern "C"
{
  caddr_t _sbrk(int incr)
  {
    static unsigned char *heap = NULL;
    unsigned char *prev_heap;

    if (heap == NULL)
    {
      heap = (unsigned char *)&_end;
    }
    prev_heap = heap;
    /* check removed to show basic approach */

    heap += incr;

    return (caddr_t)prev_heap;
  }
}