uriparser

uriparser is a URI parsing and handling library written in C (C89) that is strictly compliant to RFC 3986, the latest URI RFC on track STD 66 to date. It is a cross-platform library that supports Unicode and is licensed under the BSD License.
The software is used by numerous applications, libraries and hardware devices. It is packaged in a number of major distributions for multiple operating systems.
uriparser can help you with URI parsing, reference resolution, reference creation, recomposition and syntax-based normalization. It has no external dependencies so as to simplify integration.
Documentation is available online for developers who wish to work with uriparser, providing you with a short tutorial that shows how the library can be integrated into your projects. Examples are provided in every section to make it easier to grasp the specifics.
In the online guide, you can find information about parsing URIs from string to object, recomposing URIs from object back to string, resolving references, creating references, converting filenames to and from URIs, normalizing URIs and working with query strings.
Two versions of every structure and function are available, one for handling ANSI text and the other for working with Unicode text. The tutorial only details the former, but the Unicode versions work in much the same way.