Function omReallocSizeFromSystem

omalloc/omAllocSystem.c:250–304

}

void* omReallocSizeFromSystem(void* addr, size_t oldsize, size_t newsize)
{
  void* res;

  /*oldsize=omSizeOfLargeAddr(addr);*/
  res = OM_REALLOC_FROM_SYSTEM(addr, newsize);
  if (res == NULL)
  {
    OM_MEMORY_LOW_HOOK();
    /* Can do a realloc again: manpage reads:
       "If realloc() fails the original block is left untouched -
       it is not freed or moved." */
    res = OM_REALLOC_FROM_SYSTEM(addr, newsize);
    if (res == NULL)
    {
      OM_OUT_OF_MEMORY_HOOK();
      /* should never get here */
      omAssume(0);
      exit(1);
    }
  }
  /*newsize=omSizeOfAddr(res);*/

#ifndef OM_NDEBUG
  if (((unsigned long) res) + newsize > om_MaxAddr)
    om_MaxAddr = ((unsigned long) res) + newsize;
  if (((unsigned long) res) < om_MinAddr)
    om_MinAddr = ((unsigned long) res);
#endif

  om_Info.CurrentBytesFromMalloc += (long) newsize - (long) oldsize;


  if (om_Info.CurrentBytesFromMalloc > om_Info.MaxBytesFromMalloc)
  {
    om_Info.MaxBytesFromMalloc = om_Info.CurrentBytesFromMalloc;
#if defined(OM_HAVE_VALLOC_MMAP) && defined(OM_MALLOC_MAX_BYTES_SYSTEM)
    if (om_Info.CurrentBytesFromValloc + OM_MALLOC_MAX_BYTES_SYSTEM > om_Info.MaxBytesSystem)
      om_Info.MaxBytesSystem = om_Info.CurrentBytesFromValloc + OM_MALLOC_MAX_BYTES_SYSTEM;
#endif
#if defined(HAVE_SBRK) && !defined(OM_MALLOC_MAX_BYTES_SBRK)
    if (om_Info.MaxBytesFromMalloc
#ifndef OM_HAVE_VALLOC_MMAP
        + om_Info.CurrentBytesFromValloc
#endif
        > om_Info.MaxBytesSbrk)
    {
      om_Info.MaxBytesSbrk = (unsigned long) sbrk(0) - om_SbrkInit;
    }
#endif
  }

  OM_REALLOC_HOOK(oldsize, newsize);
  return res;
}

void omFreeToSystem(void* addr)
{