settings: Add settings_value_as_uint64() helper function

src/libstrongswan/settings/settings.c

@@ -537,6 +537,31 @@ METHOD(settings_t, get_int, int,
 	return settings_value_as_int(value, def);
 }
 
+/**
+ * Described in header
+ */
+inline u_int64_t settings_value_as_uint64(char *value, u_int64_t def)
+{
+	u_int64_t intval;
+	char *end;
+	int base = 10;
+
+	if (value)
+	{
+		errno = 0;
+		if (value[0] == '0' && value[1] == 'x')
+		{	/* manually detect 0x prefix as we want to avoid octal encoding */
+			base = 16;
+		}
+		intval = strtoull(value, &end, base);
+		if (errno == 0 && *end == 0 && end != value)
+		{
+			return intval;
+		}
+	}
+	return def;
+}
+
 /**
  * Described in header
  */

src/libstrongswan/settings/settings.h

@@ -50,6 +50,15 @@ bool settings_value_as_bool(char *value, bool def);
  */
 int settings_value_as_int(char *value, int def);
 
+/**
+ * Convert a string value returned by a key/value enumerator to an u_int64_t.
+ *
+ * @see settings_t.create_key_value_enumerator()
+ * @param value			the string value
+ * @param def			the default value, if value is NULL or invalid
+ */
+u_int64_t settings_value_as_uint64(char *value, u_int64_t def);
+
 /**
  * Convert a string value returned by a key/value enumerator to a double.
  *

src/libstrongswan/tests/suites/test_settings.c

@@ -317,6 +317,26 @@ START_TEST(test_set_int)
 }
 END_TEST
 
+START_TEST(test_value_as_unit64)
+{
+	test_int_eq(1, settings_value_as_uint64(NULL, 1));
+	test_int_eq(1, settings_value_as_uint64("", 1));
+	test_int_eq(1, settings_value_as_uint64("2a", 1));
+	test_int_eq(1, settings_value_as_uint64("a2", 1));
+	test_int_eq(1, settings_value_as_uint64("2.0", 1));
+
+	test_int_eq(10, settings_value_as_uint64("10", 0));
+	test_int_eq(10, settings_value_as_uint64("010", 0));
+	test_int_eq(16, settings_value_as_uint64("0x010", 0));
+	test_int_eq(0x2a, settings_value_as_uint64("0x2a", 0));
+
+	test_int_eq(0xffffffffffffffffLL, settings_value_as_uint64("0xffffffffffffffff", 0));
+	test_int_eq(0xffffffff00000000LL, settings_value_as_uint64("0xffffffff00000000", 0));
+	test_int_eq(0xffffffff00000000LL, settings_value_as_uint64("18446744069414584320", 0));
+	test_int_eq(0xffffffff00000001LL, settings_value_as_uint64("18446744069414584321", 0));
+}
+END_TEST
+
 START_SETUP(setup_double_config)
 {
 	create_settings(chunk_from_str(
@@ -1158,6 +1178,10 @@ Suite *settings_suite_create()
 	tcase_add_test(tc, test_set_int);
 	suite_add_tcase(s, tc);
 
+	tc = tcase_create("settings_value_as_uint64");
+	tcase_add_test(tc, test_value_as_unit64);
+	suite_add_tcase(s, tc);
+
 	tc = tcase_create("get/set_double");
 	tcase_add_checked_fixture(tc, setup_double_config, teardown_config);
 	tcase_add_test(tc, test_get_double);