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encoding(n)		     Tcl Built-In Commands		   encoding(n)

______________________________________________________________________________

NAME
       encoding - Manipulate encodings

SYNOPSIS
       encoding option ?arg arg ...?
_________________________________________________________________

INTRODUCTION
       Strings	in Tcl are encoded using 16-bit Unicode characters.  Different
       operating system interfaces or applications  may	 generate  strings  in
       other  encodings	 such  as  Shift-JIS.	The  encoding command helps to
       bridge the gap between Unicode and these other formats.

DESCRIPTION
       Performs one of	several	 encoding  related  operations,	 depending  on
       option.	The legal options are:

       encoding convertfrom ?encoding? data
	      Convert  data to Unicode from the specified encoding.  The char‐
	      acters in data are treated as binary data where the lower 8-bits
	      of  each	character  is  taken  as a single byte.	 The resulting
	      sequence of bytes is treated as a string in the specified encod‐
	      ing.   If encoding is not specified, the current system encoding
	      is used.

       encoding convertto ?encoding? string
	      Convert string from Unicode  to  the  specified  encoding.   The
	      result  is  a  sequence  of  bytes that represents the converted
	      string.  Each byte is stored in the lower 8-bits	of  a  Unicode
	      character.   If  encoding	 is  not specified, the current system
	      encoding is used.

       encoding dirs ?directoryList?
	      Tcl can load encoding data  files	 from  the  file  system  that │
	      describe	additional encodings for it to work with. This command │
	      sets the search path for *.enc encoding data files to  the  list │
	      of  directories  directoryList. If directoryList is omitted then │
	      the command returns the current list of directories that make up │
	      the  search  path.  It is an error for directoryList to not be a │
	      valid list. If, when a search for an encoding data file is  hap‐ │
	      pening,  an  element  in directoryList does not refer to a read‐ │
	      able, searchable directory, that element is ignored.

       encoding names
	      Returns a list containing the names of all of the encodings that
	      are currently available.

       encoding system ?encoding?
	      Set the system encoding to encoding. If encoding is omitted then
	      the command returns the current  system  encoding.   The	system
	      encoding is used whenever Tcl passes strings to system calls.

EXAMPLE
       It  is  common  practice to write script files using a text editor that
       produces output in the euc-jp  encoding,	 which	represents  the	 ASCII
       characters  as  singe bytes and Japanese characters as two bytes.  This
       makes it easy to embed literal strings  that  correspond	 to  non-ASCII
       characters  by  simply typing the strings in place in the script.  How‐
       ever, because the source command always reads files using  the  current
       system  encoding,  Tcl  will  only source such files correctly when the
       encoding used to write the file is the same.  This tends not to be true
       in  an  internationalized  setting.   For  example,  if such a file was
       sourced in North America (where the ISO8859-1 is normally  used),  each
       byte  in the file would be treated as a separate character that maps to
       the 00 page in Unicode.	The resulting Tcl strings will not contain the
       expected Japanese characters.  Instead, they will contain a sequence of
       Latin-1 characters that correspond to the bytes of the original string.
       The encoding command can be used to convert this string to the expected
       Japanese Unicode characters.  For example,
	      set s [encoding convertfrom euc-jp "\xA4\xCF"]
       would return the Unicode string “\u306F”, which is the Hiragana	letter
       HA.

SEE ALSO
       Tcl_GetEncoding(3)

KEYWORDS
       encoding

Tcl				      8.1			   encoding(n)
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