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A dirent structure contains the character pointer d_name, which points to a string that gives the name of a file in the directory. This string ends in a terminating NULL, and has a maximum of NAME_MAX characters.

https://www.ibm.com/support/knowledgecenter/SSLTBW_2.4.0/com.ibm.zos.v2r4.bpxbd00/rtread.htm

https://pubs.opengroup.org/onlinepubs/7908799/xsh/dirent.h.html

https://stackoverflow.com/questions/12991334/members-of-dirent-structure