CATOPEN(3)                 Library Functions Manual                 CATOPEN(3)

NAME
     catopen – open message catalog

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <nl_types.h>

     nl_catd
     catopen(const char *name, int oflag);

DESCRIPTION
     The catopen() function opens the message catalog specified by name and
     returns a message catalog descriptor.  If name contains a ‘/’ then name
     specifies the full pathname for the message catalog, otherwise the value
     of the environment variable NLSPATH is used with the following
     substitutions:

     %N   The value of the name argument.

     %L   The value of the LANG environment variable or the LC_MESSAGES
          category (see below).

     %l   The language element from the LANG environment variable or from the
          LC_MESSAGES category.

     %t   The territory element from the LANG environment variable or from the
          LC_MESSAGES category.

     %c   The codeset element from the LANG environment variable or from the
          LC_MESSAGES category.

     %%   A single % character.

     An empty string is substituted for undefined values.

     Path names templates defined in NLSPATH are separated by colons (‘:’).  A
     leading or two adjacent colons is equivalent to specifying %N.

     If the oflag argument is set to the NL_CAT_LOCALE constant, LC_MESSAGES
     locale category used to open the message catalog; using NL_CAT_LOCALE
     conforms to the X/Open Portability Guide Issue 4 (“XPG4”) standard.  You
     can specify 0 for compatibility with X/Open Portability Guide Issue 3
     (“XPG3”); when oflag is set to 0, the LANG environment variable
     determines the message catalog locale.

     A message catalog descriptor remains valid in a process until that
     process closes it, or until a successful call to one of the exec(3)
     function.

RETURN VALUES
     Upon successful completion, catopen() returns a message catalog
     descriptor.  Otherwise, (nl_catd) -1 is returned and errno is set to
     indicate the error.

ERRORS
     [EINVAL]           Argument name does not point to a valid message
                        catalog, or catalog is corrupt.

     [ENAMETOOLONG]     An entire path to the message catalog exceeded 1024
                        characters.

     [ENOENT]           The named message catalog does not exists, or the name
                        argument points to an empty string.

     [ENOMEM]           Insufficient memory is available.

SEE ALSO
     gencat(1), catclose(3), catgets(3), setlocale(3)

STANDARDS
     The catopen() function conforms to IEEE Std 1003.1-2001 (“POSIX.1”).

macOS 15.2                     February 12, 2005                    macOS 15.2