(free_bloc): This can now be simplified.
* ralloc.c (r_alloc_sbrk): When we allocate new space for the
malloc heap, zero it out even if we don't have any blocs in the
free list.
(r_alloc_sbrk): Provide hysteresis in relocating the blocs.
(relinquish): Never free less than extra_bytes;
keep extra_bytes of empty space.
(obtain): Always get extra_bytes additional space.
(r_alloc_init): Set extra_bytes and page_size.
(ALIGNED, ROUNDUP, ROUND_TO_PAGE): Use page_size.
[emacs]: Moved #undef NULL and #include "getpagesize.h" here.
[! emacs]: #include <unistd.h>, <malloc.h>, <string.h>.
(r_alloc_init): Use NIL, not NULL.
(real_morecore): New static variable.
(warnlevel, warn_function, check_memory_limits): Removed.
(obtain): Don't call check_memory_limits.
(obtain, relinquish, r_alloc_sbrk): Use (*real_morecore) in place of sbrk;
it returns 0 for errors, not -1.
(r_alloc_init): Set real_morecore to old value of __morecore.
Don't initialize lim_data or warnlevel, and don't call get_lim_data.
(memory_warnings): Function removed.
(memory_warnings): New function; just set warning data.
Use start_of_data if start is 0.
[!emacs]: Don't include config.h or lisp.h;
instead, use stddef.h. Define POINTER, SIZE, EXCEEDS_LISP_PTR.
[!emacs] (safe_bcopy): Define as macro using memmove.
(r_alloc_free): Clear *ptr.
(r_alloc_init): Renamed from malloc_init. Take no args.
Make it static; declare at top of file.
(r_alloc): Call r_alloc_init, if not initialized yet.
(r_alloc_initialized): Renamed from malloc_initialized; moved to top.
(ROUNDUP): Subtract 1, in case arg is already aligned.
(check_memory_limits): EXCEEDS_LISP_PTR renamed from EXCEEDS_ELISP_PTR.
handle memory exhaustion, it's better to return an error code to
them than to call abort.
(obtain): If we cannot allocate more memory, don't call
abort. Instead, return non-zero iff the allocation is successful.
(get_more_space): If obtain fails, return zero.
(get_bloc): Return zero if we can't allocate the new bloc.
(r_alloc_sbrk): Return zero if we can't allocate more memory.
(r_alloc): If we can't allocate more memory, set *PTR to zero and
return zero.
(r_re_alloc): If we can't allocate more memory, leave *PTR
unchanged, and return zero.
* ralloc.c (warnfunction): Renamed to warn_function; users changed.
end of the heap, copying the data to it, and then freeing the
original bloc, just expand the original block. This saves a copy
and a call to sbrk, and also removes the large spike in memory
allocation that would occur when resizing large buffers. And it's
less code.
