NAME

       idna_to_ascii_4i - API function

SYNOPSIS

       #include <idna.h>

       int idna_to_ascii_4i(const uint32_t * in, size_t inlen, char * out, int flags);

ARGUMENTS

       const uint32_t * in
                   input array with unicode code points.

       size_t inlen
                   length of input array with unicode code points.

       char * out  output  zero  terminated string that must have room for at least 63 characters
                   plus the terminating zero.

       int flags   an Idna_flags value, e.g., IDNA_ALLOW_UNASSIGNED or IDNA_USE_STD3_ASCII_RULES.

DESCRIPTION

       The ToASCII operation takes a sequence of Unicode code points  that  make  up  one  domain
       label  and  transforms  it  into  a sequence of code points in the ASCII range (0..7F). If
       ToASCII succeeds, the original sequence and the resulting sequence are equivalent labels.

       It is important to note that the ToASCII operation can fail. ToASCII fails if any step  of
       it  fails.  If any step of the ToASCII operation fails on any label in a domain name, that
       domain name MUST NOT be used as an internationalized domain name. The method for  deadling
       with this failure is application-specific.

       The  inputs  to  ToASCII  are a sequence of code points, the AllowUnassigned flag, and the
       UseSTD3ASCIIRules flag. The output of ToASCII is either a sequence of ASCII code points or
       a failure condition.

       ToASCII  never  alters  a sequence of code points that are all in the ASCII range to begin
       with (although it could fail). Applying the ToASCII operation multiple times  has  exactly
       the same effect as applying it just once.

       Return value: Returns 0 on success, or an Idna_rc error code.

REPORTING BUGS

       Report bugs to <help-libidn@gnu.org>.
       General guidelines for reporting bugs: https://www.gnu.org/gethelp/
       GNU Libidn home page: https://www.gnu.org/software/libidn/

COPYRIGHT

       Copyright © 2002-2022 Simon Josefsson.
       Copying  and distribution of this file, with or without modification, are permitted in any
       medium without royalty provided the copyright notice and this notice are preserved.

SEE ALSO

       The full documentation for libidn is maintained as a Texinfo  manual.   If  the  info  and
       libidn programs are properly installed at your site, the command

              info libidn

       should  give  you  access  to  the  complete manual.  As an alternative you may obtain the
       manual from:

              https://www.gnu.org/software/libidn/manual/