locale/FreeBSD/gb18030.5

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  27 .Dd August 10, 2003
  28 .Dt GB18030 5
  29 .Os
  30 .Sh NAME
  31 .Nm gb18030
  32 .Nd "GB 18030 encoding method for Chinese text"
  33 .Sh SYNOPSIS
  34 .Nm ENCODING
  35 .Qq GB18030
  36 .Sh DESCRIPTION
  37 The
  38 .Nm GB18030
  39 encoding implements GB 18030-2000, a PRC national standard for the encoding of
  40 Chinese characters.
  41 It is a superset of the older GB\ 2312-1980 and GBK encodings,
  42 and incorporates Unicode's Unihan Extension A completely.
  43 It also provides code space for all Unicode 3.0 code points.
  44 .Pp
  45 Multibyte characters in the
  46 .Nm GB18030
  47 encoding can be one byte, two bytes, or
  48 four bytes long.
  49 There are a total of over 1.5 million code positions.
  50 .Pp
  51 .No GB\ 11383-1981 Pq Tn ASCII
  52 characters are represented by single bytes in the range 0x00 to 0x7F.
  53 .Pp
  54 Chinese characters are represented as either two bytes or four bytes.
  55 Characters that are represented by two bytes begin with a byte in the range
  56 0x81-0xFE and end with a byte either in the range 0x40-0x7E or 0x80-0xFE.
  57 .Pp
  58 Characters that are represented by four bytes begin with a byte in the range
  59 0x81-0xFE, have a second byte in the range 0x30-0x39, a third byte in the range
  60 0x81-0xFE and a fourth byte in the range 0x30-0x39.
  61 .Sh SEE ALSO
  62 .Xr euc 5 ,
  63 .Xr gb2312 5 ,
  64 .Xr gbk 5 ,
  65 .Xr utf8 5
  66 .Rs
  67 .%T "Chinese National Standard GB 18030-2000: Information Technology -- Chinese ideograms coded character set for information interchange -- Extension for the basic set"
  68 .%D "March 2000"
  69 .Re
  70 .Rs
  71 .%Q "The Unicode Consortium"
  72 .%T "The Unicode Standard, Version 3.0"
  73 .%D "2000"
  74 .Re
  75 .Sh STANDARDS
  76 The
  77 .Nm GB18030
  78 encoding is believed to be compatible with GB 18030-2000.