tld\_check\_4tz(3) libidn tld\_check\_4tz(3)

# [NAME](#NAME)

tld\_check\_4tz - API function

# [SYNOPSIS](#SYNOPSIS)

**#include <tld.h>**

**int tld\_check\_4tz(const uint32\_t * in, size\_t * errpos, const Tld\_table * tld);**

# [ARGUMENTS](#ARGUMENTS)

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

Zero terminated array of unicode code points to process.

[size\_t * errpos](#size_t)

Position of offending character is returned here.

[const Tld\_table * tld](#const~2)

A **Tld\_table** data structure representing the restrictions for which the input should be tested.

# [DESCRIPTION](#DESCRIPTION)

Test each of the code points in *in* for whether or not they are allowed by the data structure in *tld* , return the position of the first character for which this is not the case in *errpos* .

Return value: Returns the **Tld\_rc** value **TLD\_SUCCESS** if all code points are valid or when *tld* is null, **TLD\_INVALID** if a character is not allowed, or additional error codes on general failure conditions.

# [REPORTING BUGS](#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)

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](#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/**

1.44 libidn

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Document: tld_check_4tz(3) from libidn 1.44-r4 (Chainguard OS)
Source: https://gitlab.com/libidn/libidn