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idna_to_ascii_4i(3)                 libidn                 idna_to_ascii_4i(3)

NAME
       idna_to_ascii_4i - convert Unicode domain name label to text

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 AllowUnas-
       signed 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 apply-
       ing it just once.

RETURN VALUE
       Returns 0 on success, or an Idna_rc error code.

REPORTING BUGS
       Report bugs to <bug-libidn@gnu.org>.

COPYRIGHT
       Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 Simon Josefsson.
       Permission  is  granted  to make and distribute verbatim copies of this
       manual provided the copyright notice and  this  permission  notice  are
       preserved on all copies.

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.

libidn                                1.8                  idna_to_ascii_4i(3)

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