A cross-platform implementation of legacy getopt related APIs:
xgetopt()xgetopt_long()xgetopt_long_only()xgetsubopt()
The goal is to be a drop-in replacement of getopt APIs, so the using experience should be same as the legacy.
However, some tiny differences already exist between GNU and BSD's getopt implementations, xgetopt have to choose a side on each of those. Please refer to the comments inside xgetopt.h for the details.
zlib