idn2\_to\_unicode\_44i(3) libidn2 idn2\_to\_unicode\_44i(3)

# [NAME](#NAME)

idn2\_to\_unicode\_44i - API function

# [SYNOPSIS](#SYNOPSIS)

**#include <idn2.h>**

**int idn2\_to\_unicode\_44i(const uint32\_t * in, size\_t inlen, uint32\_t * out, size\_t * outlen, int flags);**

# [ARGUMENTS](#ARGUMENTS)

[const uint32\_t * in](#const)

Input array with UTF-32 code points.

[size\_t inlen](#size_t)

number of code points of input array

[uint32\_t * out](#uint32_t)

output array with UTF-32 code points.

[size\_t * outlen](#size_t~2)

on input, maximum size of output array with UTF-32 code points, on exit, actual size of output array with UTF-32 code points.

[int flags](#int)

Currently unused.

# [DESCRIPTION](#DESCRIPTION)

The ToUnicode operation takes a sequence of UTF-32 code points that make up one domain label and returns a sequence of UTF-32 code points. If the input sequence is a label in ACE form, then the result is an equivalent internationalized label that is not in ACE form, otherwise the original sequence is returned unaltered.

*output* may be NULL to test lookup of *input* without allocating memory.

# [SINCE](#SINCE)

2.0.0

# [REPORTING BUGS](#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)

Copyright © 2002-2025 Simon Josefsson.  
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.

# [SEE ALSO](#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/**

2.3.8 libidn2

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Document: idn2_to_unicode_44i(3) from libidn2 2.3.8-r12 (Chainguard OS)
Source: https://gitlab.com/libidn/libidn2