NAME

       idn2_lookup_u8 - API function

SYNOPSIS

       #include <idn2.h>

       int idn2_lookup_u8(const uint8_t * src, uint8_t ** lookupname, int flags);

ARGUMENTS

       const uint8_t * src
                   input zero-terminated UTF-8 string in Unicode NFC normalized form.

       uint8_t ** lookupname
                   newly allocated output variable with name to lookup in DNS.

       int flags   optional idn2_flags to modify behaviour.

DESCRIPTION

       Perform  IDNA2008  lookup  string conversion on domain name  src , as described in section 5 of RFC 5891.
       Note that the input string must be encoded in UTF-8 and be in Unicode NFC form.

       Pass IDN2_NFC_INPUT in  flags to convert input to NFC form before further processing.   IDN2_TRANSITIONAL
       and IDN2_NONTRANSITIONAL do already imply IDN2_NFC_INPUT.

       Pass  IDN2_ALABEL_ROUNDTRIP  in   flags  to convert any input A-labels to U-labels and perform additional
       testing. This is default since version 2.2.  To switch this behavior off, pass IDN2_NO_ALABEL_ROUNDTRIP

       Pass IDN2_TRANSITIONAL to enable Unicode TR46 transitional processing, and IDN2_NONTRANSITIONAL to enable
       Unicode TR46 non-transitional processing.

       Multiple flags may be specified by binary or:ing them together.

       After  version  2.0.3:  IDN2_USE_STD3_ASCII_RULES  disabled  by  default.  Previously we were eliminating
       non-STD3 characters from domain strings such as _443._tcp.example.com,  or  IPs  1.2.3.4/24  provided  to
       libidn2  functions.  That was an unexpected regression for applications switching from libidn and thus it
       is no longer applied by default.  Use IDN2_USE_STD3_ASCII_RULES to enable that behavior again.

       After version 0.11:  lookupname may be NULL to test lookup of  src without allocating memory.

RETURNS

       On successful conversion IDN2_OK is returned, if the output domain or any label would have been too  long
       IDN2_TOO_BIG_DOMAIN or IDN2_TOO_BIG_LABEL is returned, or another error code is returned.

SINCE

       0.1

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:

              http://www.gnu.org/software/libidn2/manual/