[Bug nis/23266] stringop-truncation warning with new gcc8.1 in nisplus-parser.c

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https://sourceware.org/bugzilla/show_bug.cgi?id=23266

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=780684eb04298977bc411ebca1eadeeba4877833

commit 780684eb04298977bc411ebca1eadeeba4877833
Author: Maciej W. Rozycki <macro@mips.com>
Date:   Wed Jun 27 21:12:16 2018 +0100

    nisplus: Correct pwent parsing issue and resulting build error [BZ #23266]

    Copy and null-terminate NIS+ password file UID and GID entries whose
    length is non-zero and are not terminated, in addition to empty ones,
    fixing a bug and a compilation issue causing an error with GCC 8:

    nss_nisplus/nisplus-parser.c: In function '_nss_nisplus_parse_pwent':
    nss_nisplus/nisplus-parser.c:90:7: error: 'strncpy' destination unchanged
after copying no bytes [-Werror=stringop-truncation]
           strncpy (first_unused, numstr, len);
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    nss_nisplus/nisplus-parser.c:106:7: error: 'strncpy' destination unchanged
after copying no bytes [-Werror=stringop-truncation]
           strncpy (first_unused, numstr, len);
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    introduced with commit ac05397075f6:

    commit ac05397075f621cfdbe1db527c96167a58b6d18e
    Author: Ulrich Drepper <drepper@redhat.com>
    Date:   Sun Apr 30 07:01:26 2006 +0000

        * nis/nss_nisplus/nisplus-parser.c: Minor optimizations and
        cleanups.  Avoid copying data if it can be used in the old place.

    (no mailing list reference available).  Obviously regardless of the
    recently added compiler diagnostics causing a build error this code has
    been long non-functional, so I guess NIS+ servers have been supplying
    strings that are non-empty and have already been null-terminated.
    Which in turn made it unnecessary to make a null-terminated copy,
    masking this bug.

        [BZ #23266]
        * nis/nss_nisplus/nisplus-parser.c (_nss_nisplus_parse_pwent):
        Copy and null-terminate entries that are not terminated, in
        addition to empty ones.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                        |    7 +++++++
 nis/nss_nisplus/nisplus-parser.c |    4 ++--
 2 files changed, 9 insertions(+), 2 deletions(-)

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