1idn2_lookup_ul(3)                   libidn2                  idn2_lookup_ul(3)
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NAME

6       idn2_lookup_ul - API function
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SYNOPSIS

9       #include <idn2.h>
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11       int idn2_lookup_ul(const char * src, char ** lookupname, int flags);
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ARGUMENTS

14       const char * src
15                   input zero-terminated locale encoded string.
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17       char ** lookupname
18                   newly allocated output variable with name to lookup in DNS.
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20       int flags   optional idn2_flags to modify behaviour.
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DESCRIPTION

23       Perform  IDNA2008 lookup string conversion on domain name  src , as de‐
24       scribed in section 5 of RFC 5891.  Note that the input is assumed to be
25       encoded  in  the locale's default coding system, and will be transcoded
26       to UTF-8 and NFC normalized by this function.
27
28       Pass IDN2_ALABEL_ROUNDTRIP in  flags to convert any input  A-labels  to
29       U-labels  and perform additional testing. This is default since version
30       2.2.  To switch this behavior off, pass IDN2_NO_ALABEL_ROUNDTRIP
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32       Pass IDN2_TRANSITIONAL to enable Unicode TR46 transitional  processing,
33       and  IDN2_NONTRANSITIONAL  to enable Unicode TR46 non-transitional pro‐
34       cessing.
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36       Multiple flags may be specified by binary or:ing them together, for ex‐
37       ample IDN2_ALABEL_ROUNDTRIP | IDN2_NONTRANSITIONAL.
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39       The IDN2_NFC_INPUT in  flags is always enabled in this function.
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41       After  version  0.11:   lookupname  may  be NULL to test lookup of  src
42       without allocating memory.
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RETURNS

45       On successful conversion IDN2_OK is returned, if conversion from locale
46       to  UTF-8  fails then IDN2_ICONV_FAIL is returned, if the output domain
47       or  any  label  would  have  been  too  long   IDN2_TOO_BIG_DOMAIN   or
48       IDN2_TOO_BIG_LABEL is returned, or another error code is returned.
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SINCE

51       0.1
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SEE ALSO

54       The  full  documentation for libidn2 is maintained as a Texinfo manual.
55       If the info and libidn2 programs are properly installed at  your  site,
56       the command
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58              info libidn2
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60       should  give  you access to the complete manual.  As an alternative you
61       may obtain the manual from:
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63              https://www.gnu.org/software/libidn/libidn2/manual/
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65libidn2                          2.3.1.48-1925               idn2_lookup_ul(3)
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