Code Conversion

Coding system objects and API for them. More...

Data Structures
struct	MConverter
	Structure to be used in code conversion. More...
struct	MCodingInfoISO2022
	Structure for a coding system of type MCODING_TYPE_ISO_2022. More...
struct	MCodingInfoUTF
	Structure for extra information about a coding system of type MCODING_TYPE_UTF. More...

Enumerations
enum	MConversionResult {   MCONVERSION_RESULT_SUCCESS ,   MCONVERSION_RESULT_INVALID_BYTE ,   MCONVERSION_RESULT_INVALID_CHAR ,   MCONVERSION_RESULT_INSUFFICIENT_SRC ,   MCONVERSION_RESULT_INSUFFICIENT_DST ,   MCONVERSION_RESULT_IO_ERROR }
	Codes that represent the result of code conversion. More...
enum	MCodingType {   MCODING_TYPE_CHARSET ,   MCODING_TYPE_UTF ,   MCODING_TYPE_ISO_2022 ,   MCODING_TYPE_MISC }
	Types of coding system. More...
enum	MCodingFlagISO2022 {   MCODING_ISO_RESET_AT_EOL = 0x1 ,   MCODING_ISO_RESET_AT_CNTL = 0x2 ,   MCODING_ISO_EIGHT_BIT = 0x4 ,   MCODING_ISO_LONG_FORM = 0x8 ,   MCODING_ISO_DESIGNATION_G0 = 0x10 ,   MCODING_ISO_DESIGNATION_G1 = 0x20 ,   MCODING_ISO_DESIGNATION_CTEXT = 0x40 ,   MCODING_ISO_DESIGNATION_CTEXT_EXT = 0x80 ,   MCODING_ISO_LOCKING_SHIFT = 0x100 ,   MCODING_ISO_SINGLE_SHIFT = 0x200 ,   MCODING_ISO_SINGLE_SHIFT_7 = 0x400 ,   MCODING_ISO_EUC_TW_SHIFT = 0x800 ,   MCODING_ISO_ISO6429 = 0x1000 ,   MCODING_ISO_REVISION_NUMBER = 0x2000 ,   MCODING_ISO_FULL_SUPPORT = 0x3000 ,   MCODING_ISO_FLAG_MAX }
	Bit-masks to specify the detail of coding system whose type is MCODING_TYPE_ISO_2022. More...

Functions
MSymbol	mconv_define_coding (const char *name, MPlist *plist, int(*resetter)(MConverter *), int(*decoder)(const unsigned char *, int, MText *, MConverter *), int(*encoder)(MText *, int, int, unsigned char *, int, MConverter *), void *extra_info)
MSymbol	mconv_resolve_coding (MSymbol symbol)
	Resolve coding system name.
int	mconv_list_codings (MSymbol **symbols)
	List symbols representing coding systems.
MConverter *	mconv_buffer_converter (MSymbol name, const unsigned char *buf, int n)
	Create a code converter bound to a buffer.
MConverter *	mconv_stream_converter (MSymbol name, FILE *fp)
	Create a code converter bound to a stream.
int	mconv_reset_converter (MConverter *converter)
	Reset a code converter.
void	mconv_free_converter (MConverter *converter)
	Free a code converter.
MConverter *	mconv_rebind_buffer (MConverter *converter, const unsigned char *buf, int n)
	Bind a buffer to a code converter.
MConverter *	mconv_rebind_stream (MConverter *converter, FILE *fp)
	Bind a stream to a code converter.
MText *	mconv_decode (MConverter *converter, MText *mt)
	Decode a byte sequence into an M-text.
MText *	mconv_decode_buffer (MSymbol name, const unsigned char *buf, int n)
	Decode a buffer area based on a coding system.
MText *	mconv_decode_stream (MSymbol name, FILE *fp)
	Decode a stream input based on a coding system.
int	mconv_encode (MConverter *converter, MText *mt)
	Encode an M-text into a byte sequence.
int	mconv_encode_range (MConverter *converter, MText *mt, int from, int to)
	Encode a part of an M-text.
int	mconv_encode_buffer (MSymbol name, MText *mt, unsigned char *buf, int n)
	Encode an M-text into a buffer area.
int	mconv_encode_stream (MSymbol name, MText *mt, FILE *fp)
	Encode an M-text to write to a stream.
int	mconv_getc (MConverter *converter)
	Read a character via a code converter.
int	mconv_ungetc (MConverter *converter, int c)
	Push a character back to a code converter.
int	mconv_putc (MConverter *converter, int c)
	Write a character via a code converter.
MText *	mconv_gets (MConverter *converter, MText *mt)
	Read a line using a code converter.

Variables: Symbols representing coding systems
MSymbol	Mcoding_us_ascii
	Symbol for the coding system US-ASCII.
MSymbol	Mcoding_iso_8859_1
	Symbol for the coding system ISO-8859-1.
MSymbol	Mcoding_utf_8
	Symbol for the coding system UTF-8.
MSymbol	Mcoding_utf_8_full
	Symbol for the coding system UTF-8-FULL.
MSymbol	Mcoding_utf_16
	Symbol for the coding system UTF-16.
MSymbol	Mcoding_utf_16be
	Symbol for the coding system UTF-16BE.
MSymbol	Mcoding_utf_16le
	Symbol for the coding system UTF-16LE.
MSymbol	Mcoding_utf_32
	Symbol for the coding system UTF-32.
MSymbol	Mcoding_utf_32be
	Symbol for the coding system UTF-32BE.
MSymbol	Mcoding_utf_32le
	Symbol for the coding system UTF-32LE.
MSymbol	Mcoding_sjis
	Symbol for the coding system SJIS.

Variables: Parameter keys for mconv_define_coding(). <br>
MSymbol	Mtype
MSymbol	Mcharsets
MSymbol	Mflags
MSymbol	Mdesignation
MSymbol	Minvocation
MSymbol	Mcode_unit
MSymbol	Mbom
MSymbol	Mlittle_endian

Variables: Symbols representing coding system types. <br>
MSymbol	Mutf
MSymbol	Miso_2022

Variables: Symbols appearing in the value of Mflags parameter. <br>
Symbols that can be a value of the Mflags parameter of a coding system used in an argument to the mconv_define_coding() function (which see).
MSymbol	Mreset_at_eol
MSymbol	Mreset_at_cntl
MSymbol	Meight_bit
MSymbol	Mlong_form
MSymbol	Mdesignation_g0
MSymbol	Mdesignation_g1
MSymbol	Mdesignation_ctext
MSymbol	Mdesignation_ctext_ext
MSymbol	Mlocking_shift
MSymbol	Msingle_shift
MSymbol	Msingle_shift_7
MSymbol	Meuc_tw_shift
MSymbol	Miso_6429
MSymbol	Mrevision_number
MSymbol	Mfull_support

Variables: Others
Remaining variables.
MSymbol	Mmaybe
	Symbol whose name is "maybe".
MSymbol	Mcoding
	The symbol Mcoding.

Detailed Description

Coding system objects and API for them.

The m17n library represents a character encoding scheme (CES) of coded character sets (CCS) as an object called coding system. Application programs can add original coding systems.

To encode means converting code-points to character codes and to decode means converting character codes back to code-points.

Application programs can decode a byte sequence with a specified coding system into an M-text, and inversely, can encode an M-text into a byte sequence.

Enumeration Type Documentation

MConversionResult

enum MConversionResult

Codes that represent the result of code conversion.

One of these values is set in MConverter->result.

Enumerator
MCONVERSION_RESULT_SUCCESS	Code conversion is successful.
MCONVERSION_RESULT_INVALID_BYTE	On decoding, the source contains an invalid byte.
MCONVERSION_RESULT_INVALID_CHAR	On encoding, the source contains a character that cannot be encoded by the specified coding system.
MCONVERSION_RESULT_INSUFFICIENT_SRC	On decoding, the source ends with an incomplete byte sequence.
MCONVERSION_RESULT_INSUFFICIENT_DST	On encoding, the destination is too short to store the result.
MCONVERSION_RESULT_IO_ERROR	An I/O error occurred in the conversion.

MCodingType

enum MCodingType

Types of coding system.

Enumerator
MCODING_TYPE_CHARSET	A coding system of this type supports charsets directly. The dimension of each charset defines the length of bytes to represent a single character of the charset, and a byte sequence directly represents the code-point of a character. The m17n library provides the default decoding and encoding routines of this type.
MCODING_TYPE_UTF	A coding system of this type supports byte sequences of a UTF (UTF-8, UTF-16, UTF-32) like structure. The m17n library provides the default decoding and encoding routines of this type.
MCODING_TYPE_ISO_2022	A coding system of this type supports byte sequences of an ISO-2022 like structure. The details of each structure are specified by MCodingInfoISO2022 . The m17n library provides decoding and encoding routines of this type.
MCODING_TYPE_MISC	A coding system of this type is for byte sequences of miscellaneous structures. The m17n library does not provide decoding and encoding routines of this type. They must be provided by the application program.

MCodingFlagISO2022

enum MCodingFlagISO2022

Bit-masks to specify the detail of coding system whose type is MCODING_TYPE_ISO_2022.

Enumerator
MCODING_ISO_RESET_AT_EOL	On encoding, reset the invocation and designation status to initial at end of line.
MCODING_ISO_RESET_AT_CNTL	On encoding, reset the invocation and designation status to initial before any control codes.
MCODING_ISO_EIGHT_BIT	Use the right graphic plane.
MCODING_ISO_LONG_FORM	Use the non-standard 4 bytes format for designation sequence for charsets JISX0208-1978, GB2312, and JISX0208-1983.
MCODING_ISO_DESIGNATION_G0	On encoding, unless explicitly specified, designate charsets to G0.
MCODING_ISO_DESIGNATION_G1	On encoding, unless explicitly specified, designate charsets except for ASCII to G1.
MCODING_ISO_DESIGNATION_CTEXT	On encoding, unless explicitly specified, designate 94-chars charsets to G0, 96-chars charsets to G1.
MCODING_ISO_DESIGNATION_CTEXT_EXT	On encoding, encode such charsets not conforming to ISO-2022 by ESC % / ..., and encode non-supported Unicode characters by ESC % G ... ESC % @ . On decoding, handle those escape sequences.
MCODING_ISO_LOCKING_SHIFT	Use locking shift.
MCODING_ISO_SINGLE_SHIFT	Use single shift (SS2 (0x8E or ESC N), SS3 (0x8F or ESC O)).
MCODING_ISO_SINGLE_SHIFT_7	Use 7-bit single shift 2 (SS2 (0x19)).
MCODING_ISO_EUC_TW_SHIFT	Use EUC-TW like special shifting.
MCODING_ISO_ISO6429	Use ISO-6429 escape sequences to indicate direction. Not yet implemented.
MCODING_ISO_REVISION_NUMBER	On encoding, if a charset has revision number, produce escape sequences to specify the number.
MCODING_ISO_FULL_SUPPORT	Support all ISO-2022 charsets.
MCODING_ISO_FLAG_MAX

Function Documentation

mconv_define_coding()

MSymbol mconv_define_coding	(	const char *	name,
		MPlist *	plist,
		int(*)(MConverter *)	resetter,
		int(*)(const unsigned char *, int, MText *, MConverter *)	decoder,
		int(*)(MText *, int, int, unsigned char *, int, MConverter *)	encoder,
		void *	extra_info
	)

mconv_resolve_coding()

MSymbol mconv_resolve_coding

(

MSymbol

symbol

)

Resolve coding system name.

The mconv_resolve_coding() function returns symbol if it represents a coding system. Otherwise, canonicalize symbol as to a coding system name, and if the canonicalized name represents a coding system, return it. Otherwise, return Mnil.

mconv_list_codings()

int mconv_list_codings

(

MSymbol **

symbols

)

List symbols representing coding systems.

The mconv_list_codings() function makes an array of symbols representing a coding system, stores the pointer to the array in a place pointed to by symbols, and returns the length of the array.

mconv_buffer_converter()

MConverter * mconv_buffer_converter	(	MSymbol	name,
		const unsigned char *	buf,
		int	n
	)

Create a code converter bound to a buffer.

The mconv_buffer_converter() function creates a pointer to a code converter for coding system name. The code converter is bound to buffer area of n bytes pointed to by buf. Subsequent decodings and encodings are done to/from this buffer area.

name can be Mnil. In this case, a coding system associated with the current locale (LC_CTYPE) is used.

Return value:

If the operation was successful, mconv_buffer_converter() returns the created code converter. Otherwise it returns NULL and assigns an error code to the external variable merror_code.

Errors:

MERROR_SYMBOL, MERROR_CODING

See Also:

mconv_stream_converter()

mconv_stream_converter()

MConverter * mconv_stream_converter	(	MSymbol	name,
		FILE *	fp
	)

Create a code converter bound to a stream.

The mconv_stream_converter() function creates a pointer to a code converter for coding system name. The code converter is bound to stream fp. Subsequent decodings and encodings are done to/from this stream.

name can be Mnil. In this case, a coding system associated with the current locale (LC_CTYPE) is used.

Return value:

If the operation was successful, mconv_stream_converter() returns the created code converter. Otherwise it returns NULL and assigns an error code to the external variable merror_code.

Errors:

MERROR_SYMBOL, MERROR_CODING

See Also:

mconv_buffer_converter()

mconv_reset_converter()

int mconv_reset_converter

(

MConverter *

converter

)

Reset a code converter.

The mconv_reset_converter() function resets code converter converter to the initial state.

Return value:

If converter->coding has its own reseter function, mconv_reset_converter() returns the result of that function applied to converter. Otherwise it returns 0.

mconv_free_converter()

void mconv_free_converter

(

MConverter *

converter

)

Free a code converter.

The mconv_free_converter() function frees the code converter converter.

mconv_rebind_buffer()

MConverter * mconv_rebind_buffer	(	MConverter *	converter,
		const unsigned char *	buf,
		int	n
	)

Bind a buffer to a code converter.

The mconv_rebind_buffer() function binds buffer area of n bytes pointed to by buf to code converter converter. Subsequent decodings and encodings are done to/from this newly bound buffer area.

Return value:

This function always returns converter.

See Also:

mconv_rebind_stream()

mconv_rebind_stream()

MConverter * mconv_rebind_stream	(	MConverter *	converter,
		FILE *	fp
	)

Bind a stream to a code converter.

The mconv_rebind_stream() function binds stream fp to code converter converter. Following decodings and encodings are done to/from this newly bound stream.

Return value:

This function always returns converter.

See Also:

mconv_rebind_buffer()

mconv_decode()

MText * mconv_decode	(	MConverter *	converter,
		MText *	mt
	)

Decode a byte sequence into an M-text.

The mconv_decode() function decodes a byte sequence and appends the result at the end of M-text mt. The source byte sequence is taken from either the buffer area or the stream that is currently bound to converter.

Return value:

If the operation was successful, mconv_decode() returns updated mt. Otherwise it returns NULL and assigns an error code to the external variable merror_code.

Errors:

MERROR_IO, MERROR_CODING

See Also:

mconv_rebind_buffer(), mconv_rebind_stream(), mconv_encode(), mconv_encode_range(), mconv_decode_buffer(), mconv_decode_stream()

mconv_decode_buffer()

MText * mconv_decode_buffer	(	MSymbol	name,
		const unsigned char *	buf,
		int	n
	)

Decode a buffer area based on a coding system.

The mconv_decode_buffer() function decodes n bytes of the buffer area pointed to by buf based on the coding system name. A temporary code converter for decoding is automatically created and freed.

Return value:

If the operation was successful, mconv_decode_buffer() returns the resulting M-text. Otherwise it returns NULL and assigns an error code to the external variable merror_code.

Errors:

MERROR_IO, MERROR_CODING

See Also:

mconv_decode(), mconv_decode_stream()

mconv_decode_stream()

MText * mconv_decode_stream	(	MSymbol	name,
		FILE *	fp
	)

Decode a stream input based on a coding system.

The mconv_decode_stream() function decodes the entire byte sequence read in from stream fp based on the coding system name. A code converter for decoding is automatically created and freed.

Return value:

If the operation was successful, mconv_decode_stream() returns the resulting M-text. Otherwise it returns NULL and assigns an error code to the external variable merror_code.

Errors:

MERROR_IO, MERROR_CODING

See Also:

mconv_decode(), mconv_decode_buffer()

mconv_encode()

int mconv_encode	(	MConverter *	converter,
		MText *	mt
	)

Encode an M-text into a byte sequence.

The mconv_encode() function encodes M-text mt and writes the resulting byte sequence into the buffer area or the stream that is currently bound to code converter converter.

Return value:

If the operation was successful, mconv_encode() returns the number of written bytes. Otherwise it returns -1 and assigns an error code to the external variable merror_code.

Errors:

MERROR_IO, MERROR_CODING

See Also:

mconv_rebind_buffer(), mconv_rebind_stream(), mconv_decode(), mconv_encode_range()

mconv_encode_range()

int mconv_encode_range	(	MConverter *	converter,
		MText *	mt,
		int	from,
		int	to
	)

Encode a part of an M-text.

The mconv_encode_range() function encodes the text between from (inclusive) and to (exclusive) in M-text mt and writes the resulting byte sequence into the buffer area or the stream that is currently bound to code converter converter.

Return value:

If the operation was successful, mconv_encode_range() returns the number of written bytes. Otherwise it returns -1 and assigns an error code to the external variable merror_code.

Errors:

MERROR_RANGE, MERROR_IO, MERROR_CODING

See Also:

mconv_rebind_buffer(), mconv_rebind_stream(), mconv_decode(), mconv_encode()

mconv_encode_buffer()

int mconv_encode_buffer	(	MSymbol	name,
		MText *	mt,
		unsigned char *	buf,
		int	n
	)

Encode an M-text into a buffer area.

The mconv_encode_buffer() function encodes M-text mt based on coding system name and writes the resulting byte sequence into the buffer area pointed to by buf. At most n bytes are written. A temporary code converter for encoding is automatically created and freed.

Return value:

If the operation was successful, mconv_encode_buffer() returns the number of written bytes. Otherwise it returns -1 and assigns an error code to the external variable merror_code.

Errors:

MERROR_IO, MERROR_CODING

See Also:

mconv_encode(), mconv_encode_stream()

mconv_encode_stream()

int mconv_encode_stream	(	MSymbol	name,
		MText *	mt,
		FILE *	fp
	)

Encode an M-text to write to a stream.

The mconv_encode_stream() function encodes M-text mt based on coding system name and writes the resulting byte sequence to stream fp. A temporary code converter for encoding is automatically created and freed.

Return value:

If the operation was successful, mconv_encode_stream() returns the number of written bytes. Otherwise it returns -1 and assigns an error code to the external variable merror_code.

Errors:

MERROR_IO, MERROR_CODING

See Also:

mconv_encode(), mconv_encode_buffer(), mconv_encode_file()

mconv_getc()

int mconv_getc

(

MConverter *

converter

)

Read a character via a code converter.

The mconv_getc() function reads one character from the buffer area or the stream that is currently bound to code converter converter. The decoder of converter is used to decode the byte sequence. The internal status of converter is updated appropriately.

Return value:

If the operation was successful, mconv_getc() returns the character read in. If the input source reaches EOF, it returns EOF without changing the external variable merror_code. If an error is detected, it returns EOF and assigns an error code to merror_code.

Errors:

MERROR_CODING

See Also:

mconv_ungetc(), mconv_putc(), mconv_gets()

mconv_ungetc()

int mconv_ungetc	(	MConverter *	converter,
		int	c
	)

Push a character back to a code converter.

The mconv_ungetc() function pushes character c back to code converter converter. Any number of characters can be pushed back. The lastly pushed back character is firstly read by the subsequent mconv_getc() call. The characters pushed back are registered only in converter; they are not written to the input source. The internal status of converter is updated appropriately.

Return value:

If the operation was successful, mconv_ungetc() returns c. Otherwise it returns EOF and assigns an error code to the external variable merror_code.

Errors:

MERROR_CODING, MERROR_CHAR

See Also:

mconv_getc(), mconv_putc(), mconv_gets()

mconv_putc()

int mconv_putc	(	MConverter *	converter,
		int	c
	)

Write a character via a code converter.

The mconv_putc() function writes character c to the buffer area or the stream that is currently bound to code converter converter. The encoder of converter is used to encode the character. The number of bytes actually written is set to the nbytes member of converter. The internal status of converter is updated appropriately.

Return value:

If the operation was successful, mconv_putc() returns c. If an error is detected, it returns EOF and assigns an error code to the external variable merror_code.

Errors:

MERROR_CODING, MERROR_IO, MERROR_CHAR

See Also:

mconv_getc(), mconv_ungetc(), mconv_gets()

mconv_gets()

MText * mconv_gets	(	MConverter *	converter,
		MText *	mt
	)

Read a line using a code converter.

The mconv_gets() function reads one line from the buffer area or the stream that is currently bound to code converter converter. The decoder of converter is used for decoding. The decoded character sequence is appended at the end of M-text mt. The final newline character in the original byte sequence is not appended. The internal status of converter is updated appropriately.

Return value:

If the operation was successful, mconv_gets() returns the modified mt. If it encounters EOF without reading a single character, it returns mt without changing it. If an error is detected, it returns NULL and assigns an error code to merror_code.

Errors:

MERROR_CODING

See Also:

mconv_getc(), mconv_ungetc(), mconv_putc()

Variable Documentation

Mcoding_us_ascii

MSymbol Mcoding_us_ascii

Symbol for the coding system US-ASCII.

The symbol Mcoding_us_ascii has name "us-ascii" and represents a coding system for the CES US-ASCII.

Mcoding_iso_8859_1

MSymbol Mcoding_iso_8859_1

Symbol for the coding system ISO-8859-1.

The symbol Mcoding_iso_8859_1 has name "iso-8859-1" and represents a coding system for the CES ISO-8859-1.

Mcoding_utf_8

MSymbol Mcoding_utf_8

Symbol for the coding system UTF-8.

The symbol Mcoding_utf_8 has name "utf-8" and represents a coding system for the CES UTF-8.

Mcoding_utf_8_full

MSymbol Mcoding_utf_8_full

Symbol for the coding system UTF-8-FULL.

The symbol Mcoding_utf_8_full has name "utf-8-full" and represents a coding system that is a extension of UTF-8. This coding system uses the same encoding algorithm as UTF-8 but is not limited to the Unicode characters. It can encode all characters supported by the m17n library.

Mcoding_utf_16

MSymbol Mcoding_utf_16

Symbol for the coding system UTF-16.

The symbol Mcoding_utf_16 has name "utf-16" and represents a coding system for the CES UTF-16 (RFC 2279).

Mcoding_utf_16be

MSymbol Mcoding_utf_16be

Symbol for the coding system UTF-16BE.

The symbol Mcoding_utf_16be has name "utf-16be" and represents a coding system for the CES UTF-16BE (RFC 2279).

Mcoding_utf_16le

MSymbol Mcoding_utf_16le

Symbol for the coding system UTF-16LE.

The symbol Mcoding_utf_16le has name "utf-16le" and represents a coding system for the CES UTF-16LE (RFC 2279).

Mcoding_utf_32

MSymbol Mcoding_utf_32

Symbol for the coding system UTF-32.

The symbol Mcoding_utf_32 has name "utf-32" and represents a coding system for the CES UTF-32 (RFC 2279).

Mcoding_utf_32be

MSymbol Mcoding_utf_32be

Symbol for the coding system UTF-32BE.

The symbol Mcoding_utf_32be has name "utf-32be" and represents a coding system for the CES UTF-32BE (RFC 2279).

Mcoding_utf_32le

MSymbol Mcoding_utf_32le

Symbol for the coding system UTF-32LE.

The symbol Mcoding_utf_32le has name "utf-32le" and represents a coding system for the CES UTF-32LE (RFC 2279).

Mcoding_sjis

MSymbol Mcoding_sjis

Symbol for the coding system SJIS.

The symbol Mcoding_sjis has name "sjis" and represents a coding system for the CES Shift-JIS.

Mtype

MSymbol Mtype

Parameter key for mconv_define_coding() (which see).

Mcharsets

MSymbol Mcharsets

Mflags

MSymbol Mflags

Mdesignation

MSymbol Mdesignation

Minvocation

MSymbol Minvocation

Mcode_unit

MSymbol Mcode_unit

Mbom

MSymbol Mbom

Mlittle_endian

MSymbol Mlittle_endian

Mutf

MSymbol Mutf

Symbol that can be a value of the Mtype parameter of a coding system used in an argument to the mconv_define_coding() function (which see).

Miso_2022

MSymbol Miso_2022

Mreset_at_eol

MSymbol Mreset_at_eol

Mreset_at_cntl

MSymbol Mreset_at_cntl

Meight_bit

MSymbol Meight_bit

Mlong_form

MSymbol Mlong_form

Mdesignation_g0

MSymbol Mdesignation_g0

Mdesignation_g1

MSymbol Mdesignation_g1

Mdesignation_ctext

MSymbol Mdesignation_ctext

Mdesignation_ctext_ext

MSymbol Mdesignation_ctext_ext

Mlocking_shift

MSymbol Mlocking_shift

Msingle_shift

MSymbol Msingle_shift

Msingle_shift_7

MSymbol Msingle_shift_7

Meuc_tw_shift

MSymbol Meuc_tw_shift

Miso_6429

MSymbol Miso_6429

Mrevision_number

MSymbol Mrevision_number

Mfull_support

MSymbol Mfull_support

Mmaybe

MSymbol Mmaybe

Symbol whose name is "maybe".

The variable Mmaybe is a symbol of name "maybe". It is used a value of Mbom parameter of the function mconv_define_coding() (which see).

Mcoding

MSymbol Mcoding

The symbol Mcoding.

Any decoded M-text has a text property whose key is the predefined symbol Mcoding. The name of Mcoding is "coding".