Long Option Parser for Subcommands

 Lopsub is an open source library written in C which aims to ease
 the task of creating, documenting and parsing the options of Unix
 command line utilities. It is suitable for simple commands as well
 as complex command line utilities with many subcommands where each
 subcommand has its own set of options. Options and documentation are
 kept together in a single file which can be translated to C code (to
 be included in the application), or to a manual page. The library
 supports single-character short options and GNU-style long options.
 The public API is well documented and stable.