Treat out-of-range positions consistently

If a position argument to get-byte etc. is an out-of-range integer,
treat it the same regardless of whether it is a fixnum or a bignum.
* src/buffer.c (fix_position): New function.
* src/buffer.c (validate_region):
* src/character.c (Fget_byte):
* src/coding.c (Ffind_coding_systems_region_internal)
(Fcheck_coding_systems_region):
* src/composite.c (Ffind_composition_internal):
* src/editfns.c (Fposition_bytes, Fchar_after, Fchar_before)
(Finsert_buffer_substring, Fcompare_buffer_substrings)
(Fnarrow_to_region):
* src/fns.c (Fsecure_hash_algorithms):
* src/font.c (Finternal_char_font, Ffont_at):
* src/fringe.c (Ffringe_bitmaps_at_pos):
* src/search.c (search_command):
* src/textprop.c (get_char_property_and_overlay):
* src/window.c (Fpos_visible_in_window_p):
* src/xdisp.c (Fwindow_text_pixel_size):
Use it instead of CHECK_FIXNUM_COERCE_MARKER, so that
the code is simpler and treats bignums consistently with fixnums.
* src/buffer.h (CHECK_FIXNUM_COERCE_MARKER): Define here
rather than in lisp.h, and reimplement in terms of fix_position
so that it treats bignums consistently with fixnums.
* src/lisp.h (CHECK_FIXNUM_COERCE_MARKER): Move to buffer.h.
* src/textprop.c (validate_interval_range): Signal with original
bounds rather than modified ones.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/character.c b/src/character.c
index 5d419a2e836..d71cb3f145c 100644
--- a/src/character.c
+++ b/src/character.c
@@ -931,10 +931,10 @@ character is not ASCII nor 8-bit character, an error is signaled.  */)
         }
       else
         {
-          CHECK_FIXNUM_COERCE_MARKER (position);
-          if (XFIXNUM (position) < BEGV || XFIXNUM (position) >= ZV)
+          EMACS_INT fixed_pos = fix_position (position);
+          if (! (BEGV <= fixed_pos && fixed_pos < ZV))
             args_out_of_range_3 (position, make_fixnum (BEGV), make_fixnum (ZV));
-          pos = XFIXNAT (position);
+          pos = fixed_pos;
           p = CHAR_POS_ADDR (pos);
         }
       if (NILP (BVAR (current_buffer, enable_multibyte_characters)))