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idn2_lookup_u8(3) libidn2 idn2_lookup_u8(3)
idn2_lookup_u8 - API function
int idn2_lookup_u8(const uint8_t * src, uint8_t ** lookupname, int
const uint8_t * src
input zero-terminated UTF-8 string in Unicode NFC
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. IDN2_TRANSITIONAL and IDN2_NONTRANSITIONAL do
already imply IDN2_NFC_INPUT.
Pass IDN2_ALABEL_ROUNDTRIP in flags to convert any input A-labels to
U-labels and perform additional testing. This is default since version
2.2. To switch this behavior off, pass IDN2_NO_ALABEL_ROUNDTRIP
Pass IDN2_TRANSITIONAL to enable Unicode TR46 transitional processing,
and IDN2_NONTRANSITIONAL to enable Unicode TR46 non-transitional
Multiple flags may be specified by binary or:ing them together.
After version 2.0.3: IDN2_USE_STD3_ASCII_RULES disabled by default.
Previously we were eliminating non-STD3 characters from domain strings
such as _443._tcp.example.com, or IPs 22.214.171.124/24 provided to libidn2
functions. That was an unexpected regression for applications switching
from libidn and thus it is no longer applied by default. Use
IDN2_USE_STD3_ASCII_RULES to enable that behavior again.
After version 0.11: lookupname may be NULL to test lookup of src
without allocating memory.
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,
should give you access to the complete manual. As an alternative you
may obtain the manual from:
libidn2 2.2.0 idn2_lookup_u8(3)