---
name: "stringprep_ucs4_nfkc_normalize"
section: "3"
platform: "linux"
package: "libidn"
version: "1.44-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/stringprep_ucs4_nfkc_normalize"
---

# stringprep\_ucs4\_nfkc\_normalize(3)

API function

## NAME

stringprep\_ucs4\_nfkc\_normalize - API function

## SYNOPSIS

**#include \<stringprep.h\>**

**uint32\_t \* stringprep\_ucs4\_nfkc\_normalize(const uint32\_t \*** *str***, ssize\_t** *len***);**

## ARGUMENTS

- const uint32\_t \* str

  a Unicode string.

- ssize\_t len

  length of  *str* array, or -1 if  *str* is nul-terminated.

## DESCRIPTION

Converts a UCS4 string into canonical form, see **stringprep\_utf8\_nfkc\_normalize()** for more information.

Return value: a newly allocated Unicode string, that is the NFKC normalized form of  *str* .

## REPORTING BUGS

Report bugs to \<help-libidn@gnu.org\>.\
 General guidelines for reporting bugs: https://www.gnu.org/gethelp/\
 GNU Libidn home page: https://www.gnu.org/software/libidn/

## COPYRIGHT

Copyright © 2002-2026 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

The full documentation for **libidn** is maintained as a Texinfo manual.  If the **info** and **libidn** programs are properly installed at your site, the command

-

  **info libidn**

should give you access to the complete manual. As an alternative you may obtain the manual from:

-

  **https://www.gnu.org/software/libidn/manual/**