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.\" Copyright (c) 2002, 2003 Tim J. Robbins .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" $FreeBSD: release/9.1.0/lib/libc/locale/gb18030.5 131608 2004-07-05 06:39:03Z ru $ .\" .Dd August 10, 2003 .Dt GB18030 5 .Os .Sh NAME .Nm gb18030 .Nd "GB 18030 encoding method for Chinese text" .Sh SYNOPSIS .Nm ENCODING .Qq GB18030 .Sh DESCRIPTION The .Nm GB18030 encoding implements GB 18030-2000, a PRC national standard for the encoding of Chinese characters. It is a superset of the older GB\ 2312-1980 and GBK encodings, and incorporates Unicode's Unihan Extension A completely. It also provides code space for all Unicode 3.0 code points. .Pp Multibyte characters in the .Nm GB18030 encoding can be one byte, two bytes, or four bytes long. There are a total of over 1.5 million code positions. .Pp .No GB\ 11383-1981 Pq Tn ASCII characters are represented by single bytes in the range 0x00 to 0x7F. .Pp Chinese characters are represented as either two bytes or four bytes. Characters that are represented by two bytes begin with a byte in the range 0x81-0xFE and end with a byte either in the range 0x40-0x7E or 0x80-0xFE. .Pp Characters that are represented by four bytes begin with a byte in the range 0x81-0xFE, have a second byte in the range 0x30-0x39, a third byte in the range 0x81-0xFE and a fourth byte in the range 0x30-0x39. .Sh SEE ALSO .Xr euc 5 , .Xr gb2312 5 , .Xr gbk 5 , .Xr utf8 5 .Rs .%T "Chinese National Standard GB 18030-2000: Information Technology -- Chinese ideograms coded character set for information interchange -- Extension for the basic set" .%D "March 2000" .Re .Rs .%Q "The Unicode Consortium" .%T "The Unicode Standard, Version 3.0" .%D "2000" .Re .Sh STANDARDS The .Nm GB18030 encoding is believed to be compatible with GB 18030-2000.