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the wrong condition was used in determining the presence of a result
that needs space/copying for the _r functions. a zero return value
does not necessarily mean success; it can also be a non-error negative
result: no such user/group.
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this allows getgrnam and getgrgid to share code with the _r versions
in preparation for alternate backend support.
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bug report and patch by Michael Forney. the terminating null pointer
at the end of the gr_mem array was overwriting the beginning of the
string data, causing the gr_name member to always be a zero-length
string.
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these changes are a prerequisite to making stdio cancellable.
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