1 files changed, 80 insertions, 87 deletions

diff --git a/src/buffer.c b/src/buffer.c
index 6f748158e21..ef87f40e81a 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -108,10 +108,10 @@ static char buffer_permanent_local_flags[MAX_PER_BUFFER_VARS];
 int last_per_buffer_idx;
 
 static void call_overlay_mod_hooks (Lisp_Object list, Lisp_Object overlay,
-                                    int after, Lisp_Object arg1,
+                                    bool after, Lisp_Object arg1,
                                     Lisp_Object arg2, Lisp_Object arg3);
 static void swap_out_buffer_local_variables (struct buffer *b);
-static void reset_buffer_local_variables (struct buffer *b, int permanent_too);
+static void reset_buffer_local_variables (struct buffer *, bool);
 
 /* Alist of all buffer names vs the buffers. */
 /* This used to be a variable, but is no longer,
@@ -153,7 +153,7 @@ static void alloc_buffer_text (struct buffer *, ptrdiff_t);
 static void free_buffer_text (struct buffer *b);
 static struct Lisp_Overlay * copy_overlays (struct buffer *, struct Lisp_Overlay *);
 static void modify_overlay (struct buffer *, ptrdiff_t, ptrdiff_t);
-static Lisp_Object buffer_lisp_local_variables (struct buffer *, int);
+static Lisp_Object buffer_lisp_local_variables (struct buffer *, bool);
 
 /* These setters are used only in this file, so they can be private.  */
 static inline void
@@ -977,15 +977,13 @@ reset_buffer (register struct buffer *b)
    it does not treat permanent locals consistently.
    Instead, use Fkill_all_local_variables.
 
-   If PERMANENT_TOO is 1, then we reset permanent
-   buffer-local variables.  If PERMANENT_TOO is 0,
-   we preserve those.  */
+   If PERMANENT_TOO, reset permanent buffer-local variables.
+   If not, preserve those.  */
 
 static void
-reset_buffer_local_variables (register struct buffer *b, int permanent_too)
+reset_buffer_local_variables (struct buffer *b, bool permanent_too)
 {
-  register int offset;
-  int i;
+  int offset, i;
 
   /* Reset the major mode to Fundamental, together with all the
      things that depend on the major mode.
@@ -1251,14 +1249,14 @@ buffer_local_value_1 (Lisp_Object variable, Lisp_Object buffer)
 /* Return an alist of the Lisp-level buffer-local bindings of
    buffer BUF.  That is, don't include the variables maintained
    in special slots in the buffer object.
-   If CLONE is zero elements of the form (VAR . unbound) are replaced
+   If not CLONE, replace elements of the form (VAR . unbound)
    by VAR.  */
 
 static Lisp_Object
-buffer_lisp_local_variables (struct buffer *buf, int clone)
+buffer_lisp_local_variables (struct buffer *buf, bool clone)
 {
   Lisp_Object result = Qnil;
-  register Lisp_Object tail;
+  Lisp_Object tail;
   for (tail = BVAR (buf, local_var_alist); CONSP (tail); tail = XCDR (tail))
     {
       Lisp_Object val, elt;
@@ -1349,11 +1347,9 @@ DEFUN ("set-buffer-modified-p", Fset_buffer_modified_p, Sset_buffer_modified_p,
        1, 1, 0,
        doc: /* Mark current buffer as modified or unmodified according to FLAG.
 A non-nil FLAG means mark the buffer modified.  */)
-  (register Lisp_Object flag)
+  (Lisp_Object flag)
 {
-  register int already;
-  register Lisp_Object fn;
-  Lisp_Object buffer, window;
+  Lisp_Object fn, buffer, window;
 
 #ifdef CLASH_DETECTION
   /* If buffer becoming modified, lock the file.
@@ -1363,7 +1359,7 @@ A non-nil FLAG means mark the buffer modified.  */)
   /* Test buffer-file-name so that binding it to nil is effective.  */
   if (!NILP (fn) && ! NILP (BVAR (current_buffer, filename)))
     {
-      already = SAVE_MODIFF < MODIFF;
+      bool already = SAVE_MODIFF < MODIFF;
       if (!already && !NILP (flag))
 	lock_file (fn);
       else if (already && NILP (flag))
@@ -1430,7 +1426,7 @@ state of the current buffer.  Use with care.  */)
   /* Test buffer-file-name so that binding it to nil is effective.  */
   if (!NILP (fn) && ! NILP (BVAR (current_buffer, filename)))
     {
-      int already = SAVE_MODIFF < MODIFF;
+      bool already = SAVE_MODIFF < MODIFF;
       if (!already && !NILP (flag))
 	lock_file (fn);
       else if (already && NILP (flag))
@@ -1555,7 +1551,6 @@ list first, followed by the list of all buffers.  If no other buffer
 exists, return the buffer `*scratch*' (creating it if necessary).  */)
   (register Lisp_Object buffer, Lisp_Object visible_ok, Lisp_Object frame)
 {
-  Lisp_Object Fset_buffer_major_mode (Lisp_Object buffer);
   Lisp_Object tail, buf, pred;
   Lisp_Object notsogood = Qnil;
 
@@ -1626,7 +1621,6 @@ exists, return the buffer `*scratch*' (creating it if necessary).  */)
 Lisp_Object
 other_buffer_safely (Lisp_Object buffer)
 {
-  Lisp_Object Fset_buffer_major_mode (Lisp_Object buffer);
   Lisp_Object tail, buf;
 
   tail = Vbuffer_alist;
@@ -1674,7 +1668,7 @@ No argument or nil as argument means do this for the current buffer.  */)
 
 /* Truncate undo list and shrink the gap of BUFFER.  */
 
-int
+void
 compact_buffer (struct buffer *buffer)
 {
   /* Verify indirection counters.  */
@@ -1716,9 +1710,7 @@ compact_buffer (struct buffer *buffer)
 	    }
 	}
       buffer->text->compact = buffer->text->modiff;
-      return 1;
     }
-  return 0;
 }
 
 DEFUN ("kill-buffer", Fkill_buffer, Skill_buffer, 0, 1, "bKill buffer: ",
@@ -2068,8 +2060,10 @@ the current buffer's major mode.  */)
 
   CHECK_BUFFER (buffer);
 
-  if (STRINGP (BVAR (XBUFFER (buffer), name))
-      && strcmp (SSDATA (BVAR (XBUFFER (buffer), name)), "*scratch*") == 0)
+  if (NILP (BVAR (XBUFFER (buffer), name)))
+    error ("Attempt to set major mode for a dead buffer");
+
+  if (strcmp (SSDATA (BVAR (XBUFFER (buffer), name)), "*scratch*") == 0)
     function = find_symbol_value (intern ("initial-major-mode"));
   else
     {
@@ -2103,22 +2097,6 @@ DEFUN ("current-buffer", Fcurrent_buffer, Scurrent_buffer, 0, 0, 0,
   XSETBUFFER (buf, current_buffer);
   return buf;
 }
-
-/* Set the current buffer to B.
-
-   We previously set windows_or_buffers_changed here to invalidate
-   global unchanged information in beg_unchanged and end_unchanged.
-   This is no longer necessary because we now compute unchanged
-   information on a buffer-basis.  Every action affecting other
-   windows than the selected one requires a select_window at some
-   time, and that increments windows_or_buffers_changed.  */
-
-void
-set_buffer_internal (register struct buffer *b)
-{
-  if (current_buffer != b)
-    set_buffer_internal_1 (b);
-}
 
 /* Set the current buffer to B, and do not set windows_or_buffers_changed.
    This is used by redisplay.  */
@@ -2224,13 +2202,13 @@ ends when the current command terminates.  Use `switch-to-buffer' or
   return buffer;
 }
 
-/* Set the current buffer to BUFFER provided it is alive.  */
+/* Set the current buffer to BUFFER provided if it is alive.  */
 
 Lisp_Object
 set_buffer_if_live (Lisp_Object buffer)
 {
   if (! NILP (BVAR (XBUFFER (buffer), name)))
-    Fset_buffer (buffer);
+    set_buffer_internal (XBUFFER (buffer));
   return Qnil;
 }
 
@@ -2469,8 +2447,8 @@ current buffer is cleared.  */)
   struct Lisp_Marker *tail, *markers;
   struct buffer *other;
   ptrdiff_t begv, zv;
-  int narrowed = (BEG != BEGV || Z != ZV);
-  int modified_p = !NILP (Fbuffer_modified_p (Qnil));
+  bool narrowed = (BEG != BEGV || Z != ZV);
+  bool modified_p = !NILP (Fbuffer_modified_p (Qnil));
   Lisp_Object old_undo = BVAR (current_buffer, undo_list);
   struct gcpro gcpro1;
 
@@ -2819,19 +2797,19 @@ swap_out_buffer_local_variables (struct buffer *b)
    *VEC_PTR and *LEN_PTR should contain a valid vector and size
    when this function is called.
 
-   If EXTEND is non-zero, we make the vector bigger if necessary.
-   If EXTEND is zero, we never extend the vector,
-   and we store only as many overlays as will fit.
-   But we still return the total number of overlays.
+   If EXTEND, make the vector bigger if necessary.
+   If not, never extend the vector,
+   and store only as many overlays as will fit.
+   But still return the total number of overlays.
 
-   If CHANGE_REQ is true, then any position written into *PREV_PTR or
+   If CHANGE_REQ, any position written into *PREV_PTR or
    *NEXT_PTR is guaranteed to be not equal to POS, unless it is the
    default (BEGV or ZV).  */
 
 ptrdiff_t
-overlays_at (EMACS_INT pos, int extend, Lisp_Object **vec_ptr,
+overlays_at (EMACS_INT pos, bool extend, Lisp_Object **vec_ptr,
 	     ptrdiff_t *len_ptr,
-	     ptrdiff_t *next_ptr, ptrdiff_t *prev_ptr, int change_req)
+	     ptrdiff_t *next_ptr, ptrdiff_t *prev_ptr, bool change_req)
 {
   Lisp_Object overlay, start, end;
   struct Lisp_Overlay *tail;
@@ -2840,7 +2818,7 @@ overlays_at (EMACS_INT pos, int extend, Lisp_Object **vec_ptr,
   Lisp_Object *vec = *vec_ptr;
   ptrdiff_t next = ZV;
   ptrdiff_t prev = BEGV;
-  int inhibit_storing = 0;
+  bool inhibit_storing = 0;
 
   for (tail = current_buffer->overlays_before; tail; tail = tail->next)
     {
@@ -2957,13 +2935,13 @@ overlays_at (EMACS_INT pos, int extend, Lisp_Object **vec_ptr,
    *VEC_PTR and *LEN_PTR should contain a valid vector and size
    when this function is called.
 
-   If EXTEND is non-zero, we make the vector bigger if necessary.
-   If EXTEND is zero, we never extend the vector,
-   and we store only as many overlays as will fit.
-   But we still return the total number of overlays.  */
+   If EXTEND, make the vector bigger if necessary.
+   If not, never extend the vector,
+   and store only as many overlays as will fit.
+   But still return the total number of overlays.  */
 
 static ptrdiff_t
-overlays_in (EMACS_INT beg, EMACS_INT end, int extend,
+overlays_in (EMACS_INT beg, EMACS_INT end, bool extend,
 	     Lisp_Object **vec_ptr, ptrdiff_t *len_ptr,
 	     ptrdiff_t *next_ptr, ptrdiff_t *prev_ptr)
 {
@@ -2974,8 +2952,8 @@ overlays_in (EMACS_INT beg, EMACS_INT end, int extend,
   Lisp_Object *vec = *vec_ptr;
   ptrdiff_t next = ZV;
   ptrdiff_t prev = BEGV;
-  int inhibit_storing = 0;
-  int end_is_Z = end == Z;
+  bool inhibit_storing = 0;
+  bool end_is_Z = end == Z;
 
   for (tail = current_buffer->overlays_before; tail; tail = tail->next)
     {
@@ -3076,10 +3054,10 @@ overlays_in (EMACS_INT beg, EMACS_INT end, int extend,
 }
 
 
-/* Return non-zero if there exists an overlay with a non-nil
+/* Return true if there exists an overlay with a non-nil
    `mouse-face' property overlapping OVERLAY.  */
 
-int
+bool
 mouse_face_overlay_overlaps (Lisp_Object overlay)
 {
   ptrdiff_t start = OVERLAY_POSITION (OVERLAY_START (overlay));
@@ -3108,7 +3086,7 @@ mouse_face_overlay_overlaps (Lisp_Object overlay)
 
 
 /* Fast function to just test if we're at an overlay boundary.  */
-int
+bool
 overlay_touches_p (ptrdiff_t pos)
 {
   Lisp_Object overlay;
@@ -3325,7 +3303,7 @@ overlay_strings (ptrdiff_t pos, struct window *w, unsigned char **pstr)
   Lisp_Object overlay, window, str;
   struct Lisp_Overlay *ov;
   ptrdiff_t startpos, endpos;
-  int multibyte = ! NILP (BVAR (current_buffer, enable_multibyte_characters));
+  bool multibyte = ! NILP (BVAR (current_buffer, enable_multibyte_characters));
 
   overlay_heads.used = overlay_heads.bytes = 0;
   overlay_tails.used = overlay_tails.bytes = 0;
@@ -4093,6 +4071,26 @@ DEFUN ("delete-overlay", Fdelete_overlay, Sdelete_overlay, 1, 1, 0,
 
   return unbind_to (count, Qnil);
 }
+
+DEFUN ("delete-all-overlays", Fdelete_all_overlays, Sdelete_all_overlays, 0, 1, 0,
+       doc: /* Delete all overlays of BUFFER.
+BUFFER omitted or nil means delete all overlays of the current
+buffer.  */)
+  (Lisp_Object buffer)
+{
+  register struct buffer *buf;
+
+  if (NILP (buffer))
+    buf = current_buffer;
+  else
+    {
+      CHECK_BUFFER (buffer);
+      buf = XBUFFER (buffer);
+    }
+
+  delete_all_overlays (buf);
+  return Qnil;
+}
 
 /* Overlay dissection functions.  */
 
@@ -4319,7 +4317,7 @@ VALUE will be returned.*/)
   (Lisp_Object overlay, Lisp_Object prop, Lisp_Object value)
 {
   Lisp_Object tail, buffer;
-  int changed;
+  bool changed;
 
   CHECK_OVERLAY (overlay);
 
@@ -4394,7 +4392,7 @@ add_overlay_mod_hooklist (Lisp_Object functionlist, Lisp_Object overlay)
    and the insert-after-hooks of overlay ending at START.
 
    This is called both before and after the modification.
-   AFTER is nonzero when we call after the modification.
+   AFTER is true when we call after the modification.
 
    ARG1, ARG2, ARG3 are arguments to pass to the hook functions.
    When AFTER is nonzero, they are the start position,
@@ -4402,13 +4400,13 @@ add_overlay_mod_hooklist (Lisp_Object functionlist, Lisp_Object overlay)
    and the length of deleted or replaced old text.  */
 
 void
-report_overlay_modification (Lisp_Object start, Lisp_Object end, int after,
+report_overlay_modification (Lisp_Object start, Lisp_Object end, bool after,
 			     Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3)
 {
   Lisp_Object prop, overlay;
   struct Lisp_Overlay *tail;
-  /* 1 if this change is an insertion.  */
-  int insertion = (after ? XFASTINT (arg3) == 0 : EQ (start, end));
+  /* True if this change is an insertion.  */
+  bool insertion = (after ? XFASTINT (arg3) == 0 : EQ (start, end));
   struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
 
   overlay = Qnil;
@@ -4528,7 +4526,7 @@ report_overlay_modification (Lisp_Object start, Lisp_Object end, int after,
 }
 
 static void
-call_overlay_mod_hooks (Lisp_Object list, Lisp_Object overlay, int after,
+call_overlay_mod_hooks (Lisp_Object list, Lisp_Object overlay, bool after,
 			Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3)
 {
   struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
@@ -4687,7 +4685,7 @@ static int mmap_page_size;
 
 /* 1 means mmap has been initialized.  */
 
-static int mmap_initialized_p;
+static bool mmap_initialized_p;
 
 /* Value is X rounded up to the next multiple of N.  */
 
@@ -4783,9 +4781,9 @@ mmap_find (void *start, void *end)
 
 
 /* Unmap a region.  P is a pointer to the start of the user-araa of
-   the region.  Value is non-zero if successful.  */
+   the region.  */
 
-static int
+static void
 mmap_free_1 (struct mmap_region *r)
 {
   if (r->next)
@@ -4796,24 +4794,19 @@ mmap_free_1 (struct mmap_region *r)
     mmap_regions = r->next;
 
   if (munmap (r, r->nbytes_mapped) == -1)
-    {
-      fprintf (stderr, "munmap: %s\n", emacs_strerror (errno));
-      return 0;
-    }
-
-  return 1;
+    fprintf (stderr, "munmap: %s\n", emacs_strerror (errno));
 }
 
 
 /* Enlarge region R by NPAGES pages.  NPAGES < 0 means shrink R.
-   Value is non-zero if successful.  */
+   Value is true if successful.  */
 
-static int
+static bool
 mmap_enlarge (struct mmap_region *r, int npages)
 {
   char *region_end = (char *) r + r->nbytes_mapped;
   size_t nbytes;
-  int success = 0;
+  bool success = 0;
 
   if (npages < 0)
     {
@@ -4863,17 +4856,16 @@ mmap_enlarge (struct mmap_region *r, int npages)
 }
 
 
-/* Set or reset variables holding references to mapped regions.  If
-   RESTORE_P is zero, set all variables to null.  If RESTORE_P is
-   non-zero, set all variables to the start of the user-areas
-   of mapped regions.
+/* Set or reset variables holding references to mapped regions.
+   If not RESTORE_P, set all variables to null.  If RESTORE_P, set all
+   variables to the start of the user-areas of mapped regions.
 
    This function is called from Fdump_emacs to ensure that the dumped
    Emacs doesn't contain references to memory that won't be mapped
    when Emacs starts.  */
 
 void
-mmap_set_vars (int restore_p)
+mmap_set_vars (bool restore_p)
 {
   struct mmap_region *r;
 
@@ -6312,6 +6304,7 @@ and `bury-buffer-internal'.  */);
   defsubr (&Soverlayp);
   defsubr (&Smake_overlay);
   defsubr (&Sdelete_overlay);
+  defsubr (&Sdelete_all_overlays);
   defsubr (&Smove_overlay);
   defsubr (&Soverlay_start);
   defsubr (&Soverlay_end);