Flickcurl is a C library for calling the Flickr Web service API. It handles the
API signing, token management, and parameter encoding and decoding, resulting
in C functions for the Web services APIs. It... uses libcurl to call the REST
Web service, and libxml2 to manipulate the XML responses. The library supports
reading photo, tag, and comments information, the photo upload and searching
APIs, and writing tags and comments. It provides utilities such as "flickcurl"
to exercise the API and "flickrdf" to get RDF metadata descriptions out of
photos, tags, and machine tags.