Fast linux lister that avoids conventional ls bottlenecks by using system calls directly with large buffer

Inspiration: https://www.olark.com/developers-corner/you-can-list-a-directory-with-8-million-files-but-not-with-ls

Source: http://man7.org/linux/man-pages/man2/getdents.2.html

compile:

gcc lister.c -o lister

usage:

./lister [-l | -c] dir

to list to stdout all files:

./lister -l /mydir

to count files:

./lister -c /mydir