idn2_lookup_u8 man page

idn2_lookup_u8 — API function


#include <idn2.h>

int idn2_lookup_u8(const uint8_t * src, uint8_t ** lookupname, int flags);


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.


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.

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:…


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