idn2_register_ul man page

idn2_register_ul — API function


#include <idn2.h>

int idn2_register_ul(const char * ulabel, const char * alabel, char ** insertname, int flags);


const char * ulabel

input zero-terminated locale encoded string, or NULL.

const char * alabel

input zero-terminated ACE encoded string (xn--), or NULL.

char ** insertname

newly allocated output variable with name to register in DNS.

int flags

optional idn2_flags to modify behaviour.


Perform IDNA2008 register string conversion on domain label  ulabel and  alabel , as described in section 4 of RFC 5891.  Note that the input  ulabel is assumed to be encoded in the locale's default coding system, and will be transcoded to UTF-8 and NFC normalized by this function.

It is recommended to supply both  ulabel and  alabel for better error checking, but supplying just one of them will work.  Passing in only  alabel is better than only  ulabel .  See RFC 5891 section 4 for more information.

After version 0.11:  insertname may be NULL to test conversion of  src without allocating memory.


On successful conversion IDN2_OK is returned, when the given  ulabel and  alabel does not match each other IDN2_UALABEL_MISMATCH is returned, when either of the input labels are too long IDN2_TOO_BIG_LABEL is returned, when  alabel does does not appear to be a proper A-label IDN2_INVALID_ALABEL is returned, or another error code is returned.

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:


2.0.0 libidn2