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these functions return an error code, and are not explicitly
documented to set errno, but they are nonstandard and the historical
implementations do set errno as well, and some applications expect
this behavior. do likewise for compatibility.
patch by Rudolph Pereira.
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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 getpwnam and getpwuid to share code with the _r versions
in preparation for alternate backend support.
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these changes are a prerequisite to making stdio cancellable.
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