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in unibyte mode.

a text is inserted in a multibyte buffer without any code
conversion.

adjust_after_replace the new arg REPLACE as 0.

and handling post-read-conversion here, they are done in
code_convert_region.  Even if a file is read by no-conversion,
call adjust_after_replace to adjust positions.

(Vdefault_file_name_coding_system): New variable.
(syms_of_fileio): Defsubr it.
(Ffile_symlink_p): Use DECODE_FILE.
(Ffile_name_directory): Use size_byte member of XSTRING (filename).
(Ffile_name_as_directory): Likewise.
(Fdirectory_file_name): Likewise.
(Fsubstitute_in_file_name): Likewise.
(expand_and_dir_to_file): Likewise.
(Fdo_auto_save): Likewise.
(Fread_file_name): Likewise.

XSTRING (filename).

(Fwrite_region): New arg CONFIRM.  If non-nil, confirm overwriting.

to a_write.
(a_write): Handle annotations correctly when writing a string.

correct buffer (byte) position.  Adjusted for the change of
code_convert_region.

to contain just the actual file name, and not any
other preinserted text that is not really used.

enable-multibyte-characters is nil, we must check `coding:' tag
and `file-coding-system-alist' to handle eol-conversion.

(Finsert_file_contents): Adjusted for the change of
struct coding_system and function decode_coding.  For normail file
reading, use code_convert_region.
(Fwrite_region): Adjusted for the change of struct coding_system.
(e_write): Adjusted for the change of encode_coding.

properly calculate number of chars in the text.
Fix error message.

(file_name_as_directory): Error if arg is empty.
(Fwrite_region): Don't flush the encoding buffer if failure is set.

(Fwrite_region): Use message_with_string.
(auto_save_error, Fdo_auto_save): Likewise.
(Ffile_name_directory): Maybe use make_unibyte_string.
(Ffile_name_nondirectory): Likewise.
(Fsubstitute_in_file_name): Convert substituted envvars to multibyte
if necessary.  Otherwise use make_unibyte_string.
(Finsert_file_contents): Use make_unibyte_string.
(double_dollars): Use make_uninit_multibyte_string.

(Fwrite_region): Use scan_newline.

(restore_point_unwind): Now static.  Use Fgoto_char.
(Funhandled_file_name_directory): Doc fix.
(Finsert_file_contents): Handle bytes vs chars.
(Fwrite_region): Handle bytes vs chars.
(a_write): Take args in bytes; handle annotations labeled in chars.
(e_write): Rename args.
(Funhandled_file_name_directory): Doc fix.
(a_write, e_write): Now static.

before calling Vafter_insert_file_functions.
(Fwrite_region): Set Vlast_coding_system_used after deciding a
coding system to be used for encoding.

(restore_point_unwind): Likewise.

coding.h.
(Fwrite_region): Likewise.

even in a relative file name.

specified explicitly on visiting a new file, set
buffer-file-coding system of the new buffer to the specified one.

(Vfile_name_coding_system): New variable.
(syms_of_fileio): Set up Lisp variable.
(Fset_visited_file_modtime): Use ENCODE_FILE.
(Fcopy_file, Fmake_directory_internal, Fdelete_directory, Fdelete_file)
(Frename_file, Fadd_name_to_file, Ffile_exists_p Ffile_executable_p)
(Ffile_readable_p, Ffile_writable_p, Faccess_file, Ffile_symlink_p)
(Ffile_directory_p, Ffile_accessible_directory_p, Ffile_regular_p)
(Ffile_modes, Fset_file_modes, Ffile_newer_than_file_p, Fwrite_region)
(Finsert_file_contents, Fverify_visited_file_modtime): Likewise.

(Ffile_symlink_p): Decode the file name value.

drive letter, be careful not to create a UNC filename.
(Fadd_name_to_file) [WINDOWSNT]: Remove conditional.

call Fboundp on Vset_auto_coding_function, just check non-nil.

Vauto_file_coding_system.
(syms_of_fileio): Adjusted for the above change.  Doc-string
modified.
(Finsert_file_contents): The argument for Vset_auto_coding is a
concatination of the heading 1K-byte and the tailing 3K-byte.