Api function
#include <idn2.h>
int idn2_lookup_u8(const uint8_t * src, uint8_t ** lookupname, int flags);
input zero-terminated UTF-8 string in Unicode NFC normalized form.
newly allocated output variable with name to lookup in DNS.
optional idn2_flags to modify behaviour.
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. Pass IDN2_ALABEL_ROUNDTRIP in flags to convert any input A-labels to U-labels and perform additional testing. Multiple flags may be specified by binary or:ing them together, for example IDN2_NFC_INPUT | IDN2_ALABEL_ROUNDTRIP.
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.
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.