+ /* TODO: These tests assume two-complement, but conversion should work */
+ /* for one-complement and signed magnitude just as well. Anyone having */
+ /* a platform to test this on? */
+ errno = 0;
+/* long -> 32 bit */
+#if ULONG_MAX >> 31 == 1
+ /* testing "even" overflow, i.e. base is power of two */
+ TESTCASE( strtoul( "4294967295", NULL, 0 ) == ULONG_MAX );
+ TESTCASE( errno == 0 );
+ errno = 0;
+ TESTCASE( strtoul( "4294967296", NULL, 0 ) == ULONG_MAX );
+ TESTCASE( errno == ERANGE );
+ /* TODO: test "odd" overflow, i.e. base is not power of two */
+/* long -> 64 bit */
+#elif ULONG_MAX >> 63 == 1
+ /* testing "even" overflow, i.e. base is power of two */
+ TESTCASE( strtoul( "18446744073709551615", NULL, 0 ) == ULONG_MAX );
+ TESTCASE( errno == 0 );
+ errno = 0;
+ TESTCASE( strtoul( "18446744073709551616", NULL, 0 ) == ULONG_MAX );
+ TESTCASE( errno == ERANGE );
+ /* TODO: test "odd" overflow, i.e. base is not power of two */
+#else
+#error Unsupported width of 'long' (neither 32 nor 64 bit).
+#endif