Remove fixnum restriction on some display vars

This is a minor patch to remove some fixnum restrictions.
Many more such patches are needed, but one thing at a time.
* doc/emacs/custom.texi (Examining): Update fill-column example.
* src/buffer.c (fill-column, left-margin, tab-width)
(buffer-saved-size, left-margin-width, right-margin-width)
(left-fringe-width, right-fringe-width, scroll-bar-width)
(scroll-bar-height, buffer-display-count):
Allow any integer; do not restrict to fixnums.
* src/character.h (SANE_TAB_WIDTH): Do not assume tab_width
is a nonnegative fixnum.
(sanitize_tab_width): Take a Lisp_Object integer, not an
EMACS_INT.  Only use changed.
* src/data.c (store_symval_forwarding): Remove unnecessary
SYMBOLP since the predicate (e.g., Qintegerp) is always a
symbol (leave the test in as an eassert).  Avoid assignments
inside if-conditions.
* src/fileio.c (Fdo_auto_save): Do not assume
buffer-saved-size is a fixnum.  Avoid undefined behavior
on EMACS_INT overflow by multiplying a fixnum by at most 4,
not by at most 13.
* src/window.c (set_window_buffer): When buffer-display-count
is too large for a fixnum, make it a bignum.
* src/xdisp.c (FILL_COLUMN_INDICATOR_NEEDED): Remove macro, ...
(fill_column_indicator_column): ... replacing with this new function.
All uses changed.  The function is a bit pickier, to prevent
problems with non-character fixnums and columns out of range
for int, and to remove the assumption that integers are in
fixnum range.
(append_space_for_newline, extend_face_to_end_of_line):
Avoid undefined behavior with signed integer overflow.
Simplify.

1 files changed, 11 insertions, 11 deletions

diff --git a/src/buffer.c b/src/buffer.c
index 3b5078a175b..209e29f0f19 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -5603,17 +5603,17 @@ Use the command `abbrev-mode' to change this variable.  */);
                      doc: /* Non-nil if searches and matches should ignore case.  */);
 
   DEFVAR_PER_BUFFER ("fill-column", &BVAR (current_buffer, fill_column),
-                     Qfixnump,
+                     Qintegerp,
                      doc: /* Column beyond which automatic line-wrapping should happen.
 Interactively, you can set the buffer local value using \\[set-fill-column].  */);
 
   DEFVAR_PER_BUFFER ("left-margin", &BVAR (current_buffer, left_margin),
-                     Qfixnump,
+                     Qintegerp,
                      doc: /* Column for the default `indent-line-function' to indent to.
 Linefeed indents to this column in Fundamental mode.  */);
 
   DEFVAR_PER_BUFFER ("tab-width", &BVAR (current_buffer, tab_width),
-                     Qfixnump,
+                     Qintegerp,
                      doc: /* Distance between tab stops (for display of tab characters), in columns.
 NOTE: This controls the display width of a TAB character, and not
 the size of an indentation step.
@@ -5784,7 +5784,7 @@ If it is nil, that means don't auto-save this buffer.  */);
 Backing up is done before the first time the file is saved.  */);
 
   DEFVAR_PER_BUFFER ("buffer-saved-size", &BVAR (current_buffer, save_length),
-                     Qfixnump,
+                     Qintegerp,
                      doc: /* Length of current buffer when last read in, saved or auto-saved.
 0 initially.
 -1 means auto-saving turned off until next real save.
@@ -5858,7 +5858,7 @@ In addition, a char-table has six extra slots to control the display of:
 See also the functions `display-table-slot' and `set-display-table-slot'.  */);
 
   DEFVAR_PER_BUFFER ("left-margin-width", &BVAR (current_buffer, left_margin_cols),
-                     Qfixnump,
+                     Qintegerp,
                      doc: /* Width in columns of left marginal area for display of a buffer.
 A value of nil means no marginal area.
 
@@ -5866,7 +5866,7 @@ Setting this variable does not take effect until a new buffer is displayed
 in a window.  To make the change take effect, call `set-window-buffer'.  */);
 
   DEFVAR_PER_BUFFER ("right-margin-width", &BVAR (current_buffer, right_margin_cols),
-                     Qfixnump,
+                     Qintegerp,
                      doc: /* Width in columns of right marginal area for display of a buffer.
 A value of nil means no marginal area.
 
@@ -5874,7 +5874,7 @@ Setting this variable does not take effect until a new buffer is displayed
 in a window.  To make the change take effect, call `set-window-buffer'.  */);
 
   DEFVAR_PER_BUFFER ("left-fringe-width", &BVAR (current_buffer, left_fringe_width),
-                     Qfixnump,
+                     Qintegerp,
                      doc: /* Width of this buffer's left fringe (in pixels).
 A value of 0 means no left fringe is shown in this buffer's window.
 A value of nil means to use the left fringe width from the window's frame.
@@ -5883,7 +5883,7 @@ Setting this variable does not take effect until a new buffer is displayed
 in a window.  To make the change take effect, call `set-window-buffer'.  */);
 
   DEFVAR_PER_BUFFER ("right-fringe-width", &BVAR (current_buffer, right_fringe_width),
-                     Qfixnump,
+                     Qintegerp,
                      doc: /* Width of this buffer's right fringe (in pixels).
 A value of 0 means no right fringe is shown in this buffer's window.
 A value of nil means to use the right fringe width from the window's frame.
@@ -5900,12 +5900,12 @@ Setting this variable does not take effect until a new buffer is displayed
 in a window.  To make the change take effect, call `set-window-buffer'.  */);
 
   DEFVAR_PER_BUFFER ("scroll-bar-width", &BVAR (current_buffer, scroll_bar_width),
-                     Qfixnump,
+                     Qintegerp,
                      doc: /* Width of this buffer's vertical scroll bars in pixels.
 A value of nil means to use the scroll bar width from the window's frame.  */);
 
   DEFVAR_PER_BUFFER ("scroll-bar-height", &BVAR (current_buffer, scroll_bar_height),
-                     Qfixnump,
+                     Qintegerp,
                      doc: /* Height of this buffer's horizontal scroll bars in pixels.
 A value of nil means to use the scroll bar height from the window's frame.  */);
 
@@ -6175,7 +6175,7 @@ Setting this variable is very fast, much faster than scanning all the text in
 the buffer looking for properties to change.  */);
 
   DEFVAR_PER_BUFFER ("buffer-display-count",
-                     &BVAR (current_buffer, display_count), Qfixnump,
+                     &BVAR (current_buffer, display_count), Qintegerp,
                      doc: /* A number incremented each time this buffer is displayed in a window.
 The function `set-window-buffer' increments it.  */);