add tiny expression library and make it a dice expression parser

Use tiny expression library (from Github) and expand it to provide
dice expression parsing. This needs more testing obviously.

tests/Makefile.am

@@ -1,6 +1,7 @@
 bin_PROGRAMS =	test_dice_simple_roll \
 		test_dice_parse \
-		test_dice_evaluate
+		test_dice_evaluate \
+		test_expr_parse
 
 AM_CFLAGS =	-I../lib ${CMOCKA_CFLAGS}
 AM_LDFLAGS =	${CMOCKA_LIBS} ../libdice.la

tests/test_dice_parse.c

@@ -6,6 +6,10 @@
 #include <string.h>
 #include <stdlib.h>
 
+/* private library function
+ */
+int dice_consumed(dice_t d);
+
 static void test_dice_parse_none(void **data)
 {
     dice_t d = dice_parse("");
@@ -31,6 +35,8 @@ static void test_dice_parse_amount_sides(void **data)
     assert_true(dice_get(d, DICEOPTION_SIDES, &i));
     assert_int_equal(i, 10);
 
+    assert_int_equal(dice_consumed(d), 4);
+
     dice_free(d);
 }
 
@@ -44,6 +50,27 @@ static void test_dice_parse_sides(void **data)
     assert_true(dice_get(d, DICEOPTION_SIDES, &i));
     assert_int_equal(i, 12);
 
+    assert_int_equal(dice_consumed(d), 3);
+
+    dice_free(d);
+}
+
+static void test_dice_parse_big(void **data)
+{
+    char const *dice_str = "1000d120000";
+    dice_t d = dice_parse(dice_str);
+    int i = 0;
+
+    assert_non_null(d);
+
+    assert_true(dice_get(d, DICEOPTION_SIDES, &i));
+    assert_int_equal(i, 120000);
+
+    assert_true(dice_get(d, DICEOPTION_AMOUNT, &i));
+    assert_int_equal(i, 1000);
+
+    assert_int_equal(dice_consumed(d), strlen(dice_str));
+
     dice_free(d);
 }
 
@@ -54,6 +81,7 @@ int main(int ac, char **av)
         cmocka_unit_test(test_dice_parse_amount),
         cmocka_unit_test(test_dice_parse_amount_sides),
         cmocka_unit_test(test_dice_parse_sides),
+        cmocka_unit_test(test_dice_parse_big),
     };
 
     return cmocka_run_group_tests(tests, NULL, NULL);