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On 08/21/2018 10:47 AM, Michael Kerrisk (man-pages) wrote:
On 08/13/2018 02:10 PM, Florian Weimer wrote:Can ut_user be exactly UT_NAMESIZE bytes long? Or is it necessary to set aside a byte with the NUL terminator? I'm not sure what POSIX says about struct utmpx. It never says “string” in the context of ut_user, so I don't think it clarifies this matter.Each of the char fields in utmp/utmpx can be completely filled with characters. (I.e., there may not be a terminating null byte.) As you note, POSIX does not say much here, but perhaps the fact that the term "string" is not mentioned is a clue.
And indeed we already use __attribute__ ((__nonstring__)) for those. I should have checked the current sources.
Thanks, Florian
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