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CATOPEN(3)            DragonFly 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

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

     [ENOENT]           The message catalog name is invalid or empty, the
                        named catalog does not exist, or the catalog file has
                        an invalid format or unsupported size.

     [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").

DragonFly 6.5-DEVELOPMENT       October 5, 2026      DragonFly 6.5-DEVELOPMENT

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