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This commit is contained in:
Michael Kerrisk 2007-06-15 20:16:04 +00:00
parent 446a4bc839
commit 6427f1d84b
1 changed files with 6 additions and 6 deletions
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@ -62,7 +62,7 @@ and
does not have these problems and is the common way in which does not have these problems and is the common way in which
.B Unicode .B Unicode
is used on Unix-style operating systems. is used on Unix-style operating systems.
.SH PROPERTIES .SS Properties
The The
.B UTF-8 .B UTF-8
encoding has the following nice properties: encoding has the following nice properties:
@ -120,7 +120,7 @@ characters may be up to six bytes long, however the
standard specifies no characters above 0x10ffff, so Unicode characters standard specifies no characters above 0x10ffff, so Unicode characters
can only be up to four bytes long in can only be up to four bytes long in
.BR UTF-8 . .BR UTF-8 .
.SH ENCODING .SS Encoding
The following byte sequences are used to represent a character. The following byte sequences are used to represent a character.
The sequence to be used depends on the UCS code number of the character: The sequence to be used depends on the UCS code number of the character:
.TP 0.4i .TP 0.4i
@ -170,7 +170,7 @@ code values 0xd800\(en0xdfff (UTF-16 surrogates) as well as 0xfffe and
0xffff (UCS non-characters) should not appear in conforming 0xffff (UCS non-characters) should not appear in conforming
.B UTF-8 .B UTF-8
streams. streams.
.SH EXAMPLE .SS Example
The The
.B Unicode .B Unicode
character 0xa9 = 1010 1001 (the copyright sign) is encoded character 0xa9 = 1010 1001 (the copyright sign) is encoded
@ -186,7 +186,7 @@ encoded as:
.RS .RS
11100010 10001001 10100000 = 0xe2 0x89 0xa0 11100010 10001001 10100000 = 0xe2 0x89 0xa0
.RE .RE
.SH "APPLICATION NOTES" .SS "Application Notes"
Users have to select a Users have to select a
.B UTF-8 .B UTF-8
locale, for example with locale, for example with
@ -266,7 +266,7 @@ and
.B ISO 8859 .B ISO 8859
at all levels as the common character encoding on POSIX systems, at all levels as the common character encoding on POSIX systems,
leading to a significantly richer environment for handling plain text. leading to a significantly richer environment for handling plain text.
.SH SECURITY .SS Security
The The
.BR Unicode " and " UCS .BR Unicode " and " UCS
standards require that producers of standards require that producers of
@ -285,7 +285,7 @@ version of "/../" or ";" or NUL and overlook that there are many
ways to represent these things in a non-shortest ways to represent these things in a non-shortest
.B UTF-8 .B UTF-8
encoding. encoding.
.SH STANDARDS .SS Standards
ISO/IEC 10646-1:2000, Unicode 3.1, RFC\ 2279, Plan 9. ISO/IEC 10646-1:2000, Unicode 3.1, RFC\ 2279, Plan 9.
.\" .SH AUTHOR .\" .SH AUTHOR
.\" Markus Kuhn <mgk25@cl.cam.ac.uk> .\" Markus Kuhn <mgk25@cl.cam.ac.uk>