eucset(1)eucset(1)NAMEeucset - set and get code widths for ldterm
SYNOPSIS
HP15-codeset] or or or or [cswidth] ]
DESCRIPTION
The command sets or gets (reports) the encoding and display widths of
the Extended UNIX Code (EUC), UCS Transformation Format (UTF8), or
GB18030 characters processed by the current input terminal. EUC is an
encoding method for codesets composed of single or multiple bytes. EUC
permits applications and the terminal hardware to use the 7-bit US
ASCII code and up to three single byte or multibyte codesets simultane‐
ously.
ldterm is a STREAMS terminal line discipline module which obtains code‐
set information from See ldterm(7).
The cswidth value defines the character widths for codesets. If
cswidth is not implicitly or explicitly defined by passing no argument
to the command, the cswidth value is determined by the following crite‐
ria in descending priority:
1. Use the cswidth value stored in the current locale, if defined.
2. Use predefined cswidth values if the codeset name defined in the
locale is GB18030, UTF8, or one of the four HP15 codesets.
3. Use the environment variable if defined and in the correct format.
4. Use 7-bit US ASCII as the default codeset and its cswidth value.
This command must be used to specify EUC or non-EUC codesets, whether
they are single byte or multibyte. However, the command can correctly
set the cswidth parameter without using any options in most cases
except for ASIAN_UTF8. See the section for special warnings on the
values of the cswidth argument.
For the GB18030, ASIAN_UTF8, or UTF8 setting, use the option.
Options
The command recognizes the following options and arguments:
Displays the current settings of the EUC character widths for
the terminal.
Sets the width to one of the four HP15 codesets,
or or The HP15 codesets supported are and
cswidth Defines the character widths for codesets 1 through 3.
See the section in this manpage for more information.
EUC Code Set Classes
EUC divides codesets into four classes. Each codeset has two charac‐
teristics: the number of bytes for encoding the characters in the code‐
set, and the number of display columns to display the characters in the
codeset. All characters within a codeset possess the same characteris‐
tics. ASIAN_UTF8 is used for setting double width display, and UTF8 is
used for single width.
· Codeset 0 consists of all 7-bit, single byte ASCII charac‐
ters. The most significant bit of each of these characters
is 0 (zero). Characters in codeset 0 require one byte for
encoding, and occupy one display column. These values are
fixed for codeset 0 (zero). The 7-bit US ASCII code is the
primary EUC codeset, which is available to users without
direct specification.
· Codeset 1 is a supplementary EUC codeset. Codeset 1 charac‐
ters have an initial byte whose most significant bit is 1.
Characters in codeset 1 may require more than one byte for
encoding, and may require more than one display column. The
command must be used to set the characteristics for codeset
1.
· Codesets 2 and 3 are supplementary EUC codesets. Characters
in these codesets have an initial byte of SS2 or SS3, respec‐
tively. They require more than one byte for encoding, and
may require more than one display column. The command must
be used to set the characteristics for codesets 2 and 3.
The cswidth argument in the command line is a character string that
describes the character widths for codesets 1 through 3. This command
does not allow the user to modify the settings for codeset 0. The
character string is of the following format:
X1[:Y1],X2[:Y2],X3[:Y3]
X1 The number of bytes required to encode a character in code‐
set class 1.
Y1 The number of display columns needed to display characters
in this class.
X2 The number of bytes required to encode a character in code‐
set 2, not counting the SS2 byte,
Y2 The number of display columns for codeset 2 characters.
X3 The number of bytes needed to encode characters in codeset
3, not counting the SS3 byte,
Y3 The number of display columns required for these characters.
The values for the column widths may be omitted if they are equal to
the number of encoding bytes. If the encoding value of any of the EUC
codesets is set to (zero), then the codeset does not exist. See the
section for special warnings on the values of the cswidth argument.
If no cswidth argument is supplied, the command uses the value of the
environment variable. If this variable is not present, the following
default string is substituted:
This default string designates that the environment uses a single byte
EUC codeset that has characters in the EUC codeset 1 format. If the
environment uses a multibyte EUC codeset in the codeset 1 format, sin‐
gle byte or multibyte EUC codesets in the codeset 2 or 3 format, or
both, the default setting cannot be used.
EXTERNAL INFLUENCES
Environment Variables
Provide a default value for the internationalization
variables that are unset or null. If is not speci‐
fied or is set to the empty string, a default of
(see lang(5)) is used instead of If any of the
internationalization variables contain an invalid
setting, behaves as if all internationalization
variables are set to See environ(5).
If set to a nonempty string value,
override the values of all other internationaliza‐
tion variables.
Determines the locale that should be used to
affect the format and contents of diagnostic mes‐
sages written to standard error and informative
messages written to standard output.
Determines the location of message catalogs for the processing of
EXAMPLES
To display the encoding and display widths for the EUC codesets 1 to 3
in your environment, enter:
Assuming has been previously used to set for the entry generates the
following:
To change the current settings of the encoding and display widths for
the EUC characters in codesets 1 and 2 to two bytes each, enter one of
the following:
To set the encoding and display widths for the EUC characters in the
locale enter:
For enter:
For enter:
To set the code width to that of enter:
To set the code width to that of enter:
To set the code width to that of enter:
WARNINGS
The cswidth argument does not include the SS2 or SS3 bytes in the byte
width values.
This command is not specified by standards, may not be available on
other vendor's systems, and may be subject to change or obsolescence in
a future release.
AUTHOR
was developed by OSF and HP.
SEE ALSOdtterm(1), ldterm(7).
eucset(1)
