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sole visible buffer when we're currently in the mini-buffer, and
give up if so.

not defined in mman.h.

if mapping new memory at the end of the existing region fails.

  prev when startpos == pos.

conditional compilation on REL_ALLOC_MMAP to USE_MMAP_FOR_BUFFERS.
(mmap_alloc, mmap_free, mmap_realloc) [REL_ALLOC_MMAP]: Renamed
from former r_alloc_* functions in ralloc.c.
(mmap_page_size, mmap_initialized_p) [REL_ALLOC_MMAP]: New
variables.
(MEM_ALIGN) [REL_ALLOC_MMAP]: New macro.
(mmap_init) [REL_ALLOC_MMAP]: New function.
(alloc_buffer_text, enlarge_buffer_text, free_buffer_text): New
functions replacing macros BUFFER_ALLOC, BUFFER_REALLOC, and
BUFFER_FREE.

buffer's text buffer is null, map new memory.

text buffers if necessary.

they are displayed in a window on an invisible frame.

<scroll-down-aggressively>: Likewise.

INITIALIZE_INTERVAL.

(Foverlays_at, Fnext_overlay_change, Fprevious_overlay_change): Use it.

it is originally unmodified.

Variables and their initializations deleted.

apparent char boundary.
(Fset_buffer_multibyte): Convert 8-bit characters in the range
0x80..0x9F to/from multibyte form.

(syms_of_buffer): Add `default-line-spacing' and `line-spacing'.
(reset_buffer): Don't initialize extra2 and extra3.  Intialize
extra_line_spacing from default value.
(init_buffer_once): Initialize default value of extra_line_spacing.

(Fmake_indirect_buffer): Add optional argument CLONE.  Call
clone_per_buffer_values if CLONE is not nil.

(syms_of_buffer): Defsubr it.

Verify correct object type before returning pointer, using eassert.
* frame.h (XFRAME): Likewise.

* buffer.c (Frename_buffer, Fset_buffer_multibyte,
swap_out_buffer_local_variables, Fmove_overlay): Don't apply XSYMBOL, XBUFFER,
etc, to values that may be nil or of the wrong type.
* data.c (set_internal): Likewise.
* dispextern.h (WINDOW_WANTS_MODELINE_P, WINDOW_WANTS_HEADER_LINE_P): Likewise.
* fileio.c (auto_save_1): Likewise.
* insdel.c (check_markers): Likewise.
* marker.c (buf_charpos_to_bytepos, unchain_marker): Likewise.
* undo.c (record_insert): Likewise.
* vmsproc.c (child_sig): Likewise.
* window.c (unshow_buffer, window_loop): Likewise.
* xterm.c (x_erase_phys_cursor): Likewise.

instead of MAX_BUFFER_LOCAL_VARS.
(last_per_buffer_idx): Renamed from max_buffer_local_idx.

(init_buffer_once): Don't let cursor_type have a local value
in every buffer.

(init_buffer_once): Set default cursor_type value to t.
Mark cursor_type as local everywhere.
(syms_of_buffer): New per-buffer variable cursor-type.

(max_buffer_local_idx): New variable.
(reset_buffer_local_variables, Fbuffer_local_variables): Rewritten
for new handling of per-buffer variables.
(buffer_slot_type_mismatch): Use new macros for per-buffer vars.
(init_buffer_once): Initialize per-buffer vars differently.
Set max_buffer_local_idx.

only if buffer is displayed in some window.

allocate_buffer instead of xmalloc.

for *scratch* if it already existed.

redisplay after changing the multibyteness of a buffer.

string of mode-line-format.  Remove the obsolete %t.

	mode-line-format.