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idn2_lookup_u8(3)                   libidn2                  idn2_lookup_u8(3)


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


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 (C) 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/

libidn2                              2.3.4                   idn2_lookup_u8(3)

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