eucset(1)						      General Commands Manual							 eucset(1)

NAME

       eucset - 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 simul-
       taneously.

       ldterm is a STREAMS terminal line discipline module which obtains codeset 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 criteria 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  val-
       ues 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 characteristics: 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  charac-
       teristics.  ASIAN_UTF8 is used for setting double width display, and UTF8 is used for single width.

	      o  Codeset 0 consists of all 7-bit, single byte ASCII characters.  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.

	      o  Codeset 1 is a supplementary EUC codeset.  Codeset 1 characters 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.

	      o  Codesets  2 and 3 are supplementary EUC codesets.  Characters in these codesets have an initial byte of SS2 or SS3, respectively.
		 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 codeset 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 codeset 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, single 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 specified 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 internation-
			   alization variables are set to See environ(5).

       If set to a nonempty string value,
			   override the values of all other internationalization variables.

       Determines the locale that should be used to
			   affect the format and contents of diagnostic messages 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 ALSO

       dtterm(1), ldterm(7).

																	 eucset(1)