NAME

       idn2_to_ascii_4i - API function

SYNOPSIS

       #include <idn2.h>

       int idn2_to_ascii_4i(const uint32_t * input, size_t inlen, char * output, int flags);

ARGUMENTS

       const uint32_t * input
                   zero terminated input Unicode (UCS-4) string.

       size_t inlen
                   number of elements in  input .

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

       int flags   optional idn2_flags to modify behaviour.

DESCRIPTION

       THIS FUNCTION HAS BEEN DEPRECATED DUE TO A DESIGN FLAW. USE idn2_to_ascii_4i2() INSTEAD !

       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  dealing
       with this failure is application-specific.

       The inputs to ToASCII are a sequence of code points.

       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 effect as  applying
       it just once.

       The default behavior of this function (when flags are zero) is to apply the IDNA2008 rules
       without  the  TR46  amendments.  As  the  TR46  non-transitional  processing  is  nowadays
       ubiquitous,   when   unsure,   it   is   recommended   to  call  this  function  with  the
       IDN2_NONTRANSITIONAL and the IDN2_NFC_INPUT flags for compatibility with other software.

       Return value: Returns IDN2_OK on success, or error code.

SINCE

       2.0.0

DEPRECATED

       2.1.1: Use idn2_to_ascii_4i2().

REPORTING BUGS

       Report bugs to <help-libidn@gnu.org>.
       General guidelines for reporting bugs: https://www.gnu.org/gethelp/
       Libidn2 home page: https://www.gnu.org/software/libidn2/

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  libidn2 is maintained as a Texinfo manual.  If the info and
       libidn2 programs are properly installed at your site, the command

              info libidn2

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

              https://www.gnu.org/software/libidn/libidn2/manual/