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idn2_register_ul(3) libidn2 idn2_register_ul(3) NAME idn2_register_ul - API function SYNOPSIS #include <idn2.h> int idn2_register_ul(const char * ulabel, const char * alabel, char ** insertname, int flags); ARGUMENTS 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. DESCRIPTION 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. RETURNS On successful conversion IDN2_OK is returned, when the given ulabel and alabel does not match each other IDN2_UALABEL_MISMATCH is re- turned, 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 conver- sion failed IDN2_ICONV_FAIL is returned, or another error code is re- turned. 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) 2002-2025 Simon Josefsson. Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright no- tice 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 2.3.8 idn2_register_ul(3)
NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | RETURNS | REPORTING BUGS | COPYRIGHT | SEE ALSO
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