https://github.com/Tarsnap/libcperciva/blob/master/util/getopt.h https://github.com/Tarsnap/libcperciva/blob/master/util/geto... https://github.com/Tarsnap/lib

https://github.com/Tarsnap/libcperciva/blob/master/util/getopt.h https://github.com/Tarsnap/libcperciva/blob/master/util/geto... https://github.com/Tarsnap/libcperciva/blob/master/util/getopt.c https://github.com/Tarsnap/libcperciva/blob/master/util/geto... BSD licensed, of course.