---
name: "gnutls_idna_map"
section: "3"
platform: "linux"
package: "gnutls"
version: "3.8.13-3"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/gnutls_idna_map"
---

# gnutls\_idna\_map(3)

API function

## NAME

gnutls\_idna\_map - API function

## SYNOPSIS

**#include \<gnutls/gnutls.h\>**

**int gnutls\_idna\_map(const char \*** *input***, unsigned** *ilen***, gnutls\_datum\_t \*** *out***, unsigned** *flags***);**

## ARGUMENTS

- const char \* input

  contain the UTF-8 formatted domain name

- unsigned ilen

  the length of the provided string

- gnutls\_datum\_t \* out

  the result in an null-terminated allocated string

- unsigned flags

  should be zero

## DESCRIPTION

This function will convert the provided UTF-8 domain name, to its IDNA mapping in an allocated variable. Note that depending on the flags the used gnutls library was compiled with, the output of this function may vary (i.e., may be IDNA2008, or IDNA2003).

To force IDNA2008 specify the flag **GNUTLS\_IDNA\_FORCE\_2008**. In the case GnuTLS is not compiled with the necessary dependencies, **GNUTLS\_E\_UNIMPLEMENTED\_FEATURE** will be returned to indicate that gnutls is unable to perform the requested conversion.

Note also, that this function will return an empty string if an empty string is provided as input.

## RETURNS

**GNUTLS\_E\_INVALID\_UTF8\_STRING** on invalid UTF-8 data, or 0 on success.

## SINCE

3\.5.8

## REPORTING BUGS

Report bugs to \<bugs@gnutls.org\>.\
 Home page: https://www.gnutls.org

## COPYRIGHT

Copyright © 2001-2023 Free Software Foundation, Inc., and others.\
 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

The full documentation for **gnutls** is maintained as a Texinfo manual. If the /usr/share/doc/gnutls/ directory does not contain the HTML form visit

- https://www.gnutls.org/manual/