idn2\_check\_version(3) libidn2 idn2\_check\_version(3)

# [NAME](#NAME)

idn2\_check\_version - API function

# [SYNOPSIS](#SYNOPSIS)

**#include <idn2.h>**

**const char * idn2\_check\_version(const char * req\_version);**

# [ARGUMENTS](#ARGUMENTS)

[const char * req\_version](#const)

version string to compare with, or NULL.

# [DESCRIPTION](#DESCRIPTION)

Check IDN2 library version. This function can also be used to read out the version of the library code used. See **IDN2\_VERSION** for a suitable *req\_version* string, it corresponds to the idn2.h header file version. Normally these two version numbers match, but if you are using an application built against an older libidn2 with a newer libidn2 shared library they will be different.

Return value: Check that the version of the library is at minimum the one given as a string in *req\_version* and return the actual version string of the library; return NULL if the condition is not met. If NULL is passed to this function no check is done and only the version string is returned.

# [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_check_version(3) from libidn2 2.3.8-r12 (Chainguard OS)
Source: https://gitlab.com/libidn/libidn2