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is nonzero, accept multibyte form of eight-bit-control chars.
(decode_composition_emacs_mule): Likewise.
(decode_coding_emacs_mule): Likewise.
(encode_coding_emacs_mule): If coding->flags is nonzero, produce
multibyte form of eight-bit-control chars.

property before calling ccl_driver.

of CODING_REPLACEMENT_CHARACTER.
(decode_coding_iso2022): If CODING_FLAG_ISO_SAFE, set
CODING_MODE_INHIBIT_UNENCODABLE_CHAR flag in coding->mode, and
check this flag on encoding.
(encode_coding_sjis_big5): Check
CODING_MODE_INHIBIT_UNENCODABLE_CHAR flag of coding->mode.
(Fset_terminal_coding_system_internal): Set
CODING_MODE_INHIBIT_UNENCODABLE_CHAR flag in terminal_coding.mode
instead of setting CODING_FLAG_ISO_SAFE flag in
terminal_coding.flags.

even if the coding doesn't require decoding.

function.
(find_safe_codings): Pay attention to
the property tranlsation-table-for-encode of each codings.
(syms_of_coding): Give Qtranslation_table the extra slot number 2.

(find_safe_codings): Pay attention to characters registered in
latin-extra-code-table.

Vlast_coding_system_used to the argument.
(code_convert_region): If post-read-conversion function changed
the value of last-coding-sytem, keep the new value in
coding->symbol so that it won't be overridden.
(run_pre_post_conversion_on_str): Likewise.

(Vcoding_system_safe_chars): New variable.
(intersection): Remove this function.
(find_safe_codings): Don't use Vchar_coding_system_table, but try
all codings in SAFE_CODINGS.
(Ffind_coding_systems_region_internal): Adjusted for the change of
find_safe_codings.  Get generic coding systems from
Vcoding_system_safe_chars.
(Fdefine_coding_system_internal): New function.
(syms_of_coding): Defsubr Sdefine_coding_system_internal.
Initialize and staticpro Vcoding_system_safe_chars.

composition components reaches the limit, terminate composing.
(COMPOSITION_OK): New macro.
(detect_coding_iso2022): Use it if an escapse sequence for
composition is found.
(coding_restore_composition): Adjust the number of composition
components if it is not sane.

`coding-system-require-warning'.

(syms_of_coding): DEFVAR it.

(syms_of_coding): DEFVAR it.

(decode_coding_sjis_big5, decode_eol): Allow lone \r in DOS EOL.

conversion, pay attention to the case that coding->produced is not
greater than coding->consumed.

Only when it is non-nil, handle composition sequence.
(setup_coding_system) <0>: Don't force composition handling.

(Funencodable_char_position): New function.
(syms_of_coding): Defsubr Funencodable_char_position.

VISIT is a filename, make it the target.

for CODING_CATEGORY_MASK_ISO_8_2, if we read one extra byte, check
it in the normal loop.

(decode_coding, encode_coding, detect_coding_system): Source
strings now treated as const.
(decode_coding_string, encode_coding_string): Use STRING_COPYIN to
modify Lisp string contents.

pointer to lisp string data.

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

(code_convert_string1, code_convert_string_norecord)
(Ffind_operation_coding_system): Use SYMBOL_NAME instead of
XSYMBOL and name field.