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decoding loop.

element in Vcoding_system_alist.
(Fdefine_coding_system_alias): Likewise.

incorrect format data.

(Qcoding_system_define_form): New variable.
(syms_of_coding): Intern and staticpro it.
(Fcoding_system_p): Check Qcoding_system_define_form.
(Fcheck_coding_system): Try to autoload the definition of
CODING-SYSTEM.

function makes a new buffer, kill it.

(run_pre_post_conversion_on_str): If pre-write-conversion function
changed the current buffer, delete the new buffer.
(run_pre_write_conversin_on_c_str): Likewise.

(syms_of_coding): Initialize it.
(ONE_MORE_BYTE): Decrement `src' before calling string_char.
(ONE_MORE_BYTE_NO_CHECK): Likewise.
(record_conversion_result): Add `default:' case.
(coding_charset_list): Delete unused variable `coding_type'.
(Fdefine_coding_system_internal): Add `ascii-compatible-p'
property in the plist of the coding system.
(Fcoding_system_put): Check QCascii_compatible_p.

(code_convert_region): Adjusted for the above change.
(set_conversion_work_buffer): If the work buffer is already in
use, generate a new buffer and return it.  Otherwise return Qnil.
(run_pre_post_conversion_on_str): Adjusted for the above change.
(run_pre_write_conversin_on_c_str): Likewise.

* coding.h (Qprocess_argument): Remove unused var.

(encode_coding_object): Use safe_call instead of call2.

the docstring of coding-category-list.

If NOCOPY is nonzero and there's no need of encoding, make STR
unibyte directly.

translation-table is specified.

(decode_coding_emacs_mule, encode_coding_emacs_mule)
(decode_coding_iso2022, encode_designation_at_bol)
(encode_coding_iso2022, decode_coding_sjis_big5, decode_eol)
(decode_coding): Constify arguments and local vars.

(coding_charset_list): New function.

(syms_of_coding): Initialize and staticpro it.
(set_conversion_work_buffer): New function.
(run_pre_post_conversion_on_str): Use it.
(run_pre_write_conversin_on_c_str): New function.

annotation.

Qundecided.
(Fterminal_coding_system): Return nil if terminal coding system is
`undecided'.
(syms_of_coding): Define coding-system `undecided' here.  Setup
terminal_coding as `undecided'.

Free composition data.
(encode_coding_string): Likewise.

BOM is not found.
(detect_coding): Optimization for ISO-2022 when no 8-bit data is
found.
(detect_coding_system): Likewise.

etc. with shrinked_bytes.