(libc.info.gz) Locale Categories

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 7.3 Locale Categories
 =====================
 
 The purposes that locales serve are grouped into "categories", so that a
 user or a program can choose the locale for each category independently.
 Here is a table of categories; each name is both an environment variable
 that a user can set, and a macro name that you can use as the first
 argument to 'setlocale'.
 
    The contents of the environment variable (or the string in the second
 argument to 'setlocale') has to be a valid locale name.   Locale
 Names.
 
 'LC_COLLATE'
      This category applies to collation of strings (functions 'strcoll'
      and 'strxfrm'); see  Collation Functions.
 
 'LC_CTYPE'
      This category applies to classification and conversion of
      characters, and to multibyte and wide characters; see 
      Character Handling, and  Character Set Handling.
 
 'LC_MONETARY'
      This category applies to formatting monetary values; see 
      General Numeric.
 
 'LC_NUMERIC'
      This category applies to formatting numeric values that are not
      monetary; see  General Numeric.
 
 'LC_TIME'
      This category applies to formatting date and time values; see 
      Formatting Calendar Time.
 
 'LC_MESSAGES'
      This category applies to selecting the language used in the user
      interface for message translation ( The Uniforum approach;
       Message catalogs a la X/Open) and contains regular
      expressions for affirmative and negative responses.
 
 'LC_ALL'
      This is not a category; it is only a macro that you can use with
      'setlocale' to set a single locale for all purposes.  Setting this
      environment variable overwrites all selections by the other 'LC_*'
      variables or 'LANG'.
 
 'LANG'
      If this environment variable is defined, its value specifies the
      locale to use for all purposes except as overridden by the
      variables above.
 
    When developing the message translation functions it was felt that
 the functionality provided by the variables above is not sufficient.
 For example, it should be possible to specify more than one locale name.
 Take a Swedish user who better speaks German than English, and a program
 whose messages are output in English by default.  It should be possible
 to specify that the first choice of language is Swedish, the second
 German, and if this also fails to use English.  This is possible with
 the variable 'LANGUAGE'.  For further description of this GNU extension
 see  Using gettextized software.
 
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