1994-05-27 05:00:24 +00:00
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.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Paul Borman at Krystal Technologies.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)utf2.4 8.1 (Berkeley) 6/4/93
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1999-08-28 00:22:10 +00:00
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.\" $FreeBSD$
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1994-05-27 05:00:24 +00:00
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.\"
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1997-06-23 04:03:49 +00:00
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.Dd June 4, 1993
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1994-05-27 05:00:24 +00:00
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.Dt UTF2 4
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.Os
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.Sh NAME
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1996-02-09 17:25:57 +00:00
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.Nm utf2
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1994-05-27 05:00:24 +00:00
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.Nd "Universal character set Transformation Format encoding of runes
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.Sh SYNOPSIS
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1997-01-31 01:00:12 +00:00
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.Nm ENCODING
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.Qq UTF2
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1994-05-27 05:00:24 +00:00
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.Sh DESCRIPTION
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The
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.Nm UTF2
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encoding is based on a proposed X-Open multibyte
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\s-1FSS-UCS-TF\s+1 (File System Safe Universal Character Set Transformation Format) encoding as used in
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.Nm Plan 9 from Bell Labs.
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Although it is capable of representing more than 16 bits,
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the current implementation is limited to 16 bits as defined by the
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Unicode Standard.
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.Pp
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.Nm UTF2
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representation is backwards compatible with ASCII, so 0x00-0x7f refer to the
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ASCII character set. The multibyte encoding of runes between 0x0080 and 0xffff
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consist entirely of bytes whose high order bit is set. The actual
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encoding is represented by the following table:
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.Bd -literal
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[0x0000 - 0x007f] [00000000.0bbbbbbb] -> 0bbbbbbb
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Correct description of which runes are encoded as two bytes.
PR: 4555
Submitted by: Dmitrij Tejblum <tejblum@arc.hq.cti.ru>
[0x0400 - 0xffff] [bbbbbbbb.bbbbbbbb] -> 1110bbbb, 10bbbbbb, 10bbbbbb
.Ed
.Pp
If more than a single representation of a value exists (for example,
0x00; 0xC0 0x80; 0xE0 0x80 0x80) the shortest representation is always
used (but the longer ones will be correctly decoded).
.Pp
The final three encodings provided by X-Open:
.Bd -literal
[00000000.000bbbbb.bbbbbbbb.bbbbbbbb] ->
11110bbb, 10bbbbbb, 10bbbbbb, 10bbbbbb
[000000bb.bbbbbbbb.bbbbbbbb.bbbbbbbb] ->
111110bb, 10bbbbbb, 10bbbbbb, 10bbbbbb, 10bbbbbb
[0bbbbbbb.bbbbbbbb.bbbbbbbb.bbbbbbbb] ->
1111110b, 10bbbbbb, 10bbbbbb, 10bbbbbb, 10bbbbbb, 10bbbbbb
.Ed
.Pp
which provides for the entire proposed ISO-10646 31 bit standard are currently
not implemented.
.Sh "SEE ALSO"
.Xr mklocale 1 ,
.Xr setlocale 3
@
1.4
log
@Don't use hardcoded *roff font change requests. Do it
via mdoc macros instead.
@
text
@d37 1
a37 1
.Dd "June 4, 1993"
@
1.3
log
@Very minor mdoc cleanup.
@
text
@d44 2
a45 1
\fBENCODING "UTF2"\fP
@
1.2
log
@Another round of various man page cleanups.
@
text
@d65 1
a65 1
.sp
d81 1
a81 1
.sp
@
1.2.2.1
log
@YAMFC:
Commit all of the -current changes that apply to 2.2. These fall into
several categories:
- Cosmetic/mdoc changes. They don't really afect the output
at all, but having them in 2.2 will make it easier to diff the man
pages later when looking for real changes.
- Update some man pages to reflect the current 2.2 header files.
- Sort xrefs.
- A few typo fixes.
- And a few changes that actualy added text to the man page that should
be reflected in 2.2.
- Add some missing MLINKS.
Requested by: bde
@
text
@d44 1
a44 2
.Nm ENCODING
.Qq UTF2
d65 1
a65 1
.Pp
d81 1
a81 1
.Pp
@
1.2.2.2
log
@MFC: Just the locale fixes (small doc tweaks for the most part)
and the new strptime(3) call. Having added something, does this
require a version bump? Haven't we bumped once already?
There are a *LOT* of additional 3.0 changes to be merged but I'm not
entirely comfortable with some of them so I'll take the conservative
(read: cowardly :) way out and just merge this much.
@
text
@d37 1
a37 1
.Dd June 4, 1993
@
1.1
log
@Initial revision
@
text
@d41 1
a41 1
.Nm UTF2
@
1.1.1.1
log
@BSD 4.4 Lite Lib Sources
@
text
@@
1.1.1.1.6.1
log
@Phase 2 of merge - also fix things broken in phase 1.
Watch out for falling rock until phase 3 is over!
libc completely merged except for phkmalloc & rfork (don't know if David
wants that).
Some include files in sys/ had to be updated in order to bring in libc.
@
text
@d41 1
a41 1
.Nm utf2
@
1.1.1.1.6.2
log
@This 3rd mega-commit should hopefully bring us back to where we were.
I can get it to `make world' succesfully, anyway!
@
text
@d41 1
a41 1
.Nm UTF2
@
1997-11-05 04:18:42 +00:00
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[0x0080 - 0x07ff] [00000bbb.bbbbbbbb] -> 110bbbbb, 10bbbbbb
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[0x0800 - 0xffff] [bbbbbbbb.bbbbbbbb] -> 1110bbbb, 10bbbbbb, 10bbbbbb
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1994-05-27 05:00:24 +00:00
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.Ed
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1997-01-31 00:25:12 +00:00
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.Pp
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1994-05-27 05:00:24 +00:00
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If more than a single representation of a value exists (for example,
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0x00; 0xC0 0x80; 0xE0 0x80 0x80) the shortest representation is always
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used (but the longer ones will be correctly decoded).
|
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|
|
|
.Pp
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The final three encodings provided by X-Open:
|
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.Bd -literal
|
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[00000000.000bbbbb.bbbbbbbb.bbbbbbbb] ->
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11110bbb, 10bbbbbb, 10bbbbbb, 10bbbbbb
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[000000bb.bbbbbbbb.bbbbbbbb.bbbbbbbb] ->
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111110bb, 10bbbbbb, 10bbbbbb, 10bbbbbb, 10bbbbbb
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[0bbbbbbb.bbbbbbbb.bbbbbbbb.bbbbbbbb] ->
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1111110b, 10bbbbbb, 10bbbbbb, 10bbbbbb, 10bbbbbb, 10bbbbbb
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.Ed
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1997-01-31 00:25:12 +00:00
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.Pp
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1994-05-27 05:00:24 +00:00
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which provides for the entire proposed ISO-10646 31 bit standard are currently
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not implemented.
|
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.Sh "SEE ALSO"
|
|
|
|
|
.Xr mklocale 1 ,
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.Xr setlocale 3
|
