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idn2_register_ul(3) libidn2 idn2_register_ul(3)
idn2_register_ul - API function
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
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
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, when ulabel locale
to UTF-8 conversion failed IDN2_ICONV_FAIL is returned, or another
error code is returned.
Report bugs to <email@example.com>.
General guidelines for reporting bugs: https://www.gnu.org/gethelp/
Libidn2 home page: https://www.gnu.org/software/libidn2/
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.
The full documentation for libidn2 is maintained as a Texinfo manual.
If the info and libidn2 programs are properly installed at your site,
should give you access to the complete manual. As an alternative you
may obtain the manual from:
libidn2 2.3.4 idn2_register_ul(3)