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iso2022jp(5)							 iso2022jp(5)



NAME

  iso2022jp, iso-2022-jp, ISO-2022-JP -	A character encoding system (codeset)
  for Japanese

DESCRIPTION

  The ISO-2022-JP codeset consists of the following character sets:

    +  ASCII

       For information on the ASCII character set, refer to ascii(5).

    +  JIS X0201-1976

       Only the	Roman letters in this character	set are	included. For
       details,	refer to deckanji(5).

    +  JIS X0208-1978

    +  JIS X0208-1983

       JIS X0208-1983 is a revised version of JIS X0208-1978 and remapped
       some characters of JIS X0208-1978 to other positions.

  Before a character is	used, its corresponding	character set must be desig-
  nated. In ISO-2022-JP, the designation of a character	set is done by using
  an escape sequence as	follows:

  _____________________________________________________________
  Escape Sequence   Character Set
  _____________________________________________________________
  ESC (	B	    ACSII
  ESC (	J	    JIS	X0201-1976 (left-hand part)
  ESC $	@	    JIS	X0208-1978
  ESC $	( 0

		    User-defined characters (This range	of
		    characters is proprietary to Compaq.)
  ESC $	B	    JIS	X0208-1983
  _____________________________________________________________

  It is	assumed	that the starting code of a line is ASCII (including CR	alone
  and LF alone,	but not	including the combination CRLF). If there are JIS
  X0208	characters on a	line, there must be a switch to	ASCII or to the
  left-hand part of JIS	X0201 (Roman letters) before the end of	the line (in
  other	words, before the CRLF,	or carriage return and line feed).

  For example, if a line starts	with the ASCII character 9, followed by	the
  JIS X0208-1978 character at row 16 column 1, the line	is encoded as fol-
  lows:

       39h ESC $ @ 30h 21h ....	ESC ( B	.... CRLF


  If a line starts with	the JIS	X0208-1978 character at	row 16 column 1, fol-
  lowed	by the ASCII character 9, then the line	is encoded as follows:

       ESC $ @ 30h 21h ESC ( B 39h ....	CRLF


  Once a character set is designated, there is no need to redesignate the
  character set	if the adjacent	character belongs to the same character	set.
  For example, the following practice is not recommended:

       ESC $ B .... ESC	$ B ....

  Currently, the operating system supports the ISO 2022-JP codeset only
  through codeset converters; there is no direct support through locales or
  fonts. For your options in printing and displaying Japanese characters,
  refer	to i18n_printing(5) and	Japanese(5).

  Codeset Conversion


  The following	codeset	converter pairs	are available for converting Japanese
  characters between ISO-2022-JP and other encoding formats.  In converter
  names, the string ISO-2022-JP	indicates that user-defined characters are
  not included in the conversion jwhile	the string ISO-2022-JPext indicates
  that user-defined characters are included in the convertsion.	Refer to
  iconv_intro(5) for an	introduction to	codeset	conversion. For	more informa-
  tion about the other codeset for which ISO-2022-JP or	ISO-2022-JPext is the
  input	or output, see the reference page specified in the list	item.

    +  deckanji_ISO-2022-JP or deckanji_ISO-2022-JPext,	ISO-2022-JP_deckanji
       or ISO-2022-JPext_deckanji

       Converting from and to the DEC Kanji codeset: deckanji(5).

    +  eucJP_ISO-2022-JP or eucJP_ISO-2022-JPext, ISO-2022-JP_eucJP or ISO-
       2022-JPext_eucJP

       Converting from and to Japanese Extended	UNIX Code: eucJP(5).

    +  sdeckanji_ISO-2022-JP or	sdeckanji_ISO-2022-JPext, ISO-2022-
       JP_sdeckanji or ISO-2022-JPext_sdeckanji

       Converting from and to the Super	DEC Kanji codeset: sdeckanji(5).

    +  SJIS_ISO-2022-JP	or SJIS_ISO-2022-JPext,	ISO-2022-JP_SJIS or ISO-
       2022-JPext_SJIS

       Converting from and to the Shift	JIS codeset: SJIS(5).

       Note that SJIS encoding is equivalent to	the Microsoft code-page	for-
       mat used	on PC systems. Therefore, you can use these converters to
       convert Japanese	characters between the ISO 2022-JP and PC code-page
       formats.	See code_page(5) for information on how	the operating system
       supports	PC code	pages.

SEE ALSO

  Commands: locale(1)

  Others: ascii(5), code_page(5), deckanji(5), eucJP(5), i18n_intro(5),
  i18n_printing(5), iconv_intro(5), iso2022(5),	Japanese(5), jiskanji(5),
  l10n_intro(5), sdeckanji(5), shiftjis(5)