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OpenDarwin 7.2.1 - man page for encoding (opendarwin section n)

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

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NAME
       encoding - Manipulate encodings

SYNOPSIS
       encoding option ?arg arg ...?
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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 characters  in	data  are
	      treated  as binary data where the lower 8-bits of each character is taken as a sin-
	      gle byte.  The resulting sequence of bytes is treated as a string in the	specified
	      encoding.  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 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.	 However,
       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 result-
       ing 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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