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all data from output files when *ANNOT was nil.

char.  When comparing with file size convert same_at_start to
distance to buffer start.  If the file matches the buffer
contents truncate the buffer to the size of the file.

(Finsert_file_contents): Declare `buffer' as unsigned char.

(do_auto_save_unwind): Corresponding changes.

Close both before discarding the unwind protects.

(Fdo_auto_save): Write a list of all auto save file names.
(Vauto_save_list_file_name): Specify file name to put them in.
(syms_of_fileio): Set up Lisp var.

since it is t or nil.  Change to handle t or nil as value
of find-buffer-file-type.

(Ffind_file_name_handler): Obey that variable.  Use new meaning
for inhibit-file-name-handlers.

Instead, store -1 in b->save_length.  And don't auto save
if there is -1 there.

(Vinhibit_file_name_handlers): New var.
(syms_of_fileio): Set up Lisp var.
(Ffind_file_name_handler): Obey the variable.

in previous change.

(Fcopy_file, Fadd_name_to_file, Fmake_symbolic_link): Likewise.

confusing make-docfile.

Allow for doubled dollar signs in dir when computing pos.

(Finsert_file_contents): Use del_range_1.

Exit main loop if INSERTED reaches TOTAL.

New feature to replace buffer contents with file contents.

LOGNAME.

(Fread_file_name_internal): Use double_dollars.
(Fread_file_name): Likewise.

(Fclear_buffer_auto_save_failure): New function.
(Fset_buffer_auto_saved): Clear auto_save_failure_time.

(err_str): Macro removed.
(Finsert_file_contents, Fwrite_region): Call strerror instead of err_str.