Extended test drivers to cover sign error.

[pdclib] / functions / stdlib / strtoull.c

diff --git a/functions/stdlib/strtoull.c b/functions/stdlib/strtoull.c
index a65779cfadd6be34fab012fca92f753d328aa736..ca9dd1936ee2fb46c11dddfaf5f424aa5147e3bb 100644 (file)
--- a/functions/stdlib/strtoull.c
+++ b/functions/stdlib/strtoull.c
@@ -75,6 +75,24 @@ int main( void )
     endptr = NULL;
     TESTCASE( strtoull( overflow, &endptr, 0 ) == 0 );
     TESTCASE( endptr == overflow );
+    errno = 0;
+#if ULLONG_MAX == 0xffffffffffffffffLL
+    /* testing "even" overflow, i.e. base is power of two */
+    TESTCASE( strtoull( "18446744073709551615", NULL, 0 ) == ULLONG_MAX );
+    TESTCASE( errno == 0 );
+    TESTCASE( strtoull( "18446744073709551616", NULL, 0 ) == ULLONG_MAX );
+    TESTCASE( errno == ERANGE );
+    /* TODO: test "odd" overflow, i.e. base is not power of two */
+#elif ULLONG_MAX == 0xffffffffffffffffffffffffffffffffLL
+    /* testing "even" overflow, i.e. base is power of two */
+    TESTCASE( strtoull( "340282366920938463463374607431768211455", NULL, 0 ) == ULLONG_MAX );
+    TESTCASE( errno == 0 );
+    TESTCASE( strtoull( "340282366920938463463374607431768211456", NULL, 0 ) == ULLONG_MAX );
+    TESTCASE( errno == ERANGE );
+    /* TODO: test "odd" overflow, i.e. base is not power of two */
+#else
+#error Unsupported width of 'long long' (neither 64 nor 128 bit).
+#endif
     return TEST_RESULTS;
 }