endptr = NULL;
TESTCASE( strtoumax( overflow, &endptr, 0 ) == 0 );
TESTCASE( endptr == overflow );
+ errno = 0;
+/* uintmax_t -> long long -> 64 bit */
+#if UINTMAX_MAX >> 63 == 1
+ /* testing "odd" overflow, i.e. base is not power of two */
+ TESTCASE( strtoumax( "18446744073709551615", NULL, 0 ) == UINTMAX_MAX );
+ TESTCASE( errno == 0 );
+ TESTCASE( strtoumax( "18446744073709551616", NULL, 0 ) == UINTMAX_MAX );
+ TESTCASE( errno == ERANGE );
+ /* testing "even" overflow, i.e. base is power of two */
+ errno = 0;
+ TESTCASE( strtoumax( "0xFFFFFFFFFFFFFFFF", NULL, 0 ) == UINTMAX_MAX );
+ TESTCASE( errno == 0 );
+ TESTCASE( strtoumax( "0x10000000000000000", NULL, 0 ) == UINTMAX_MAX );
+ TESTCASE( errno == ERANGE );
+/* uintmax_t -> long long -> 128 bit */
+#elif UINTMAX_MAX >> 127 == 1
+ /* testing "odd" overflow, i.e. base is not power of two */
+ TESTCASE( strtoumax( "340282366920938463463374607431768211455", NULL, 0 ) == UINTMAX_MAX );
+ TESTCASE( errno == 0 );
+ TESTCASE( strtoumax( "340282366920938463463374607431768211456", NULL, 0 ) == UINTMAX_MAX );
+ TESTCASE( errno == ERANGE );
+ /* testing "even" everflow, i.e. base is power of two */
+ errno = 0;
+ TESTCASE( strtoumax( "0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF", NULL, 0 ) == UINTMAX_MAX );
+ TESTCASE( errno == 0 );
+ TESTCASE( strtoumax( "0x100000000000000000000000000000000", NULL, 0 ) == UINTMAX_MAX );
+ TESTCASE( errno == ERANGE );
+#else
+#error Unsupported width of 'uintmax_t' (neither 64 nor 128 bit).
+#endif
return TEST_RESULTS;
}