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behaviour in front of symlinks.
(Fdelete_file): Raise an error on directories.

(Fdo_auto_save): Add gcpros around Ffile_name_directory.

Vcoding_system_for_write is non-nil, if
coding_system_require_warning is nonzero, call
Vselect_safe_coding_system_function.

for files bigger than 2Gb when off_t is 32 bit.

Only call push_message if we need to.
At the same time, make an unwind-protect to pop it.
Rename local message_p to old_message_p.
(do_auto_save_make_dir, do_auto_save_eh): New functions.
(do_auto_save_unwind): Don't call pop_message.

`const' since CORRECT_DIR_SEPS modifies its target.

const.
(Ffile_name_directory, Ffile_name_nondirectory):
(Fmake_directory_internal, Fdelete_directory):
(Ffile_name_absolute_p, Fwrite_region, double_dollars): Use const
for pointer to lisp string data.

(Fread_file_name): Use SREF, SSET.

SCHARS, SBYTES, STRING_INTERVALS, SREF, SDATA; explicit size_byte references
left unchanged for now.

Pass FILE arg to Vselect_safe_coding_system_function.

speed up for using predicate file-directory-p.

New variables.
(syms_of_fileio): DEFVAR_LISP them.
(read_file_name_cleanup): New unwind function.
(Fread_file_name_internal): Only return completions satifying
Vread_file_name_predicate.  Temporarily unwind protect and rebind
default-directory while checking completions against the predicate.
(Fread_file_name): Added PREDICATE argument.  Specbind it to
Vread_file_name_predicate during completion.
Call Vread_file_name_function to read the file name if non-nil.

(Finsert_file_contents, build_annotations): Use XCAR, XCDR.
(Vwrite_region_annotate_functions): Docstring fix.

Don't call temp_output_buffer_setup--do just part, by hand.

read-only when setting modified time.

and there's no such user, don't discard everything before ~user.

of the current drive as the fallback for default_directory.