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GNU Libunistring
Unicode string library

Libunistring is a library providing functions to manipulate Unicode strings and for manipulating C strings according to the Unicode standard.

Libunistring can be used by applications involving non-trivial text processing, such as upper/lower case conversions, line breaking, operations on words, or more advanced analysis of text. Text provided by the user can, in general, contain characters of all kinds of scripts. The text processing functions provided by this library handle all scripts and all languages.

It also may be useful for an application that already uses the ISO C / POSIX <ctype.h>, <wctype.h> functions and the text it operates on is provided by the user and can be in any language.

The library is also useful for applications using Unicode strings as internal in-memory representation.


This package consists of the following parts:
  • unistr.h, elementary string functions
  • uniconv.h, conversion from/to legacy encodings
  • unistdio.h, formatted output to strings
  • uniname.h, character names
  • unictype.h, character classification and properties
  • uniwidth.h, string width when using nonproportional fonts
  • unigbrk.h, grapheme cluster breaks
  • uniwbrk.h, word breaks
  • unilbrk.h, line breaking algorithm
  • uninorm.h, normalization (composition and decomposition)
  • unicase.h, case folding
  • uniregex.h, regular expressions (not yet implemented)

See the user manual for more information. An online copy is available in various format at:


LicenseVerified byVerified onNotes
LGPLv2orlaterGenium29 January 2017
/lib/, /lib/
LGPLv3orlaterGenium29 January 2017
GPLv3orlaterGenium29 January 2017
/lib/, /lib/, etc.

Leaders and contributors

Bruno Haible Maintainer

Resources and communication

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Software prerequisites

Kind Description

This entry (in part or in whole) was last reviewed on 29 January 2017.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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