libcfg+ is a C library that features multi- command line and
configuration file parsing. It is possible to set up various special
properties such as quoting characters, deliminator strings, file comment
prefixes, multi-line postfixes, and more. It supports many data types
such as booleans, integers, decimal numbers, strings with many
additional data type flags (such as multiple values for a single
option).

Homepage:
http://opensource.platon.sk/projects/main_page.php?project_id=3
