(intersection, find_safe_codings): New functions.
(Ffind_coding_systems_region_internal): New function.
(syms_of_coding): Defsubr it. Initialize Qsafe_chars,
(intersection, find_safe_codings): New functions.
(Ffind_coding_systems_region_internal): New function.
(syms_of_coding): Defsubr it. Initialize Qsafe_chars,