CATOPEN(3C-SVR4)    RISC/os Reference Manual     CATOPEN(3C-SVR4)



NAME
     catopen, catclose - open/close a message catalogue

SYNOPSIS
     #include <nltypes.h>

     nlcatd catopen (char *name, int oflag);

     int catclose (nlcatd catd);

DESCRIPTION
     catopen opens a message catalogue and returns a catalogue
     descriptor.  name specifies the name of the message catalo-
     gue to be opened.  If name contains a / then name specifies
     a pathname for the message catalogue.  Otherwise, the
     environment variable NLSPATH is used.  If NLSPATH does not
     exist in the environment, or if a message catalogue cannot
     be opened in any of the paths specified by NLSPATH, then the
     default path is used [see nl_types(5)].

     The names of message catalogues, and their location in the
     filestore, can vary from one system to another.  Individual
     applications can choose to name or locate message catalogues
     according to their own special needs.  A mechanism is there-
     fore required to specify where the catalogue resides.

     The NLSPATH variable provides both the location of message
     catalogues, in the form of a search path, and the naming
     conventions associated with message catalogue files.  For
     example:

          NLSPATH=/nlslib/%L/%N.cat:/nlslib/%N/%L

     The metacharacter % introduces a substitution field, where
     %L substitutes the current setting of the LANG environment
     variable (see following section), and %N substitutes the
     value of the name parameter passed to catopen.  Thus, in the
     above example, catopen will search in
     /nlslib/$LANG/name.cat, then in /nlslib/name/$LANG, for the
     required message catalogue.

     NLSPATH will normally be set up on a system wide basis
     (e.g., in /etc/profile) and thus makes the location and nam-
     ing conventions associated with message catalogues tran-
     sparent to both programs and users.

     The full set of metacharacters is:

          %N   The value of the name parameter passed to catopen.

          %L   The value of LANG.




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CATOPEN(3C-SVR4)    RISC/os Reference Manual     CATOPEN(3C-SVR4)



          %l   The value of the language element of LANG.

          %t   The value of the territory element of LANG.

          %c   The value of the codeset element of LANG.

          %%   A single %.

     The LANG environment variable provides the ability to
     specify the user's requirements for native languages, local
     customs and character set, as an ASCII string in the form

          LANG=language[_territory[.codeset]]

     A user who speaks German as it is spoken in Austria and has
     a terminal which operates in ISO 8859/1 codeset, would want
     the setting of the LANG variable to be

          LANG=De_A.88591

     With this setting it should be possible for that user to
     find any relevant catalogues should they exist.

     Should the LANG variable not be set then the value of
     LC_MESSAGES as returned by setlocale is used. If this is
     NULL then the default path as defined in nl_types is used.

     oflag is reserved for future use and should be set to 0.
     The results of setting this field to any other value are
     undefined.

     catclose closes the message catalogue identified by catd.

SEE ALSO
     catgets(3C), setlocale(3C), environ(5), nl_types(5).

DIAGNOSTICS
     If successful, catopen returns a message catalogue descrip-
     tor for use on subsequent calls to catgets and catclose.
     Otherwise catopen returns (nl_catd)-1.

     catclose returns 0 if successful, otherwise -1.













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