strerror_r: enforce POSIX recommendations

[pspp] / ChangeLog

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+2011-05-24  Eric Blake  <eblake@redhat.com>
+
+       strerror_r: enforce POSIX recommendations
+       * lib/strerror_r.c (safe_copy): New helper method.
+       (strerror_r): Guarantee a non-empty string.
+       * tests/test-strerror_r.c (main): Enhance tests to incorporate
+       recent POSIX rulings and to match our strerror guarantees.
+       * doc/posix-functions/strerror_r.texi (strerror_r): Document this.
+
 2011-05-24  Jim Meyering  <meyering@redhat.com>
 
        test-perror2.c: avoid warning about unused variable