Issue #338, add json_object_add_int functions

json_object.c

@@ -666,6 +666,19 @@ int json_object_set_int(struct json_object *jso,int new_value){
 	return 1;
 }
 
+int json_object_add_int(struct json_object *jso, int val) {
+	if (!jso || jso->o_type != json_type_int)
+		return 0;
+	if (val > 0 && jso->o.c_int64 > INT32_MAX - val) {
+		jso->o.c_int64 = INT32_MAX;
+	} else if (val < 0 && jso->o.c_int64 < INT32_MIN - val) {
+		jso->o.c_int64 = INT32_MIN;
+	} else {
+		jso->o.c_int64 += val;
+	}
+	return 1;
+}
+
 
 struct json_object* json_object_new_int64(int64_t i)
 {
@@ -711,6 +724,19 @@ int json_object_set_int64(struct json_object *jso,int64_t new_value){
 	return 1;
 }
 
+int json_object_add_int64(struct json_object *jso, int64_t val) {
+	if (!jso || jso->o_type != json_type_int)
+		return 0;
+	if (val > 0 && jso->o.c_int64 > INT64_MAX - val) {
+		jso->o.c_int64 = INT64_MAX;
+	} else if (val < 0 && jso->o.c_int64 < INT64_MIN - val) {
+		jso->o.c_int64 = INT64_MIN;
+	} else {
+		jso->o.c_int64 += val;
+	}
+	return 1;
+}
+
 /* json_object_double */
 
 #if defined(HAVE___THREAD)

json_object.h

@@ -718,6 +718,22 @@ JSON_EXPORT int32_t json_object_get_int(const struct json_object *obj);
  */
 JSON_EXPORT int json_object_set_int(struct json_object *obj,int new_value);
 
+/** Add the int value to the value of a json object
+ *
+ * The type of obj is checked to be a json type int and 0 is returned
+ * if it is not without any further actions. If the type of obj is
+ * json_type_int the int value is added to the object value.
+ * If the addition would result in a overflow, the object value
+ * is set to INT32_MAX.
+ * If the addition would result in a underflow, the object value
+ * is set to INT32_MIN.
+ *
+ * @param obj the json_object instance
+ * @param val the value to add
+ * @returns 1 if the addition succeded, 0 otherwise
+ */
+JSON_EXPORT int json_object_add_int(struct json_object *obj, int val);
+
 
 /** Get the int value of a json_object
  *
@@ -747,6 +763,21 @@ JSON_EXPORT int64_t json_object_get_int64(const struct json_object *obj);
  */
 JSON_EXPORT int json_object_set_int64(struct json_object *obj,int64_t new_value);
 
+/** Add a int64_t value to the int64_t value of a json_object
+ *
+ * The type of obj is checked to be a json_type_int and 0 is returned
+ * if it is not without any further actions. If the type of obj is
+ * json_type_int the int64 value is added to the object value.
+ * If the addition to the object would result in a overflow the
+ * object value is set to INT64_MAX.
+ * If the addition would result in a underflow, the
+ * object value is set to INT64_MIN.
+ *
+ * @param obj the json_object instance
+ * @param val the int64_vaule to add
+ * @returns 1 if the addition succeeded, 0 otherwise
+ */
+JSON_EXPORT int json_object_add_int64(struct json_object *obj, int64_t val);
 
 /* double type methods */
 

tests/Makefile.am

@@ -25,6 +25,7 @@ TESTS+= test_compare.test
 TESTS+= test_set_value.test
 TESTS+= test_visit.test
 TESTS+= test_json_pointer.test
+TESTS+= test_int_add.test
 
 check_PROGRAMS=
 check_PROGRAMS += $(TESTS:.test=)

tests/test_int_add.c

@@ -0,0 +1,41 @@
+#include <assert.h>
+#include <stdio.h>
+
+#include "json.h"
+
+int main(int argc, char **argv)
+{
+	json_object *tmp = json_object_new_int(123);
+	json_object_add_int(tmp, 123);
+	assert(json_object_get_int(tmp) == 246);
+	json_object_put(tmp);
+	printf("INT ADD PASSED\n");
+	tmp = json_object_new_int(INT32_MAX);
+	json_object_add_int(tmp, 100);
+	assert(json_object_get_int(tmp) == INT32_MAX);
+	json_object_put(tmp);
+	printf("INT ADD OVERFLOW PASSED\n");
+	tmp = json_object_new_int(INT32_MIN);
+	json_object_add_int(tmp, -100);
+	assert(json_object_get_int(tmp) == INT32_MIN);
+	json_object_put(tmp);
+	printf("INT ADD UNDERFLOW PASSED\n");
+	tmp = json_object_new_int64(321321321);
+	json_object_add_int(tmp, 321321321);
+	assert(json_object_get_int(tmp) == 642642642);
+	json_object_put(tmp);
+	printf("INT64 ADD PASSED\n");
+	tmp = json_object_new_int64(INT64_MAX);
+	json_object_add_int64(tmp, 100);
+	assert(json_object_get_int64(tmp) == INT64_MAX);
+	json_object_put(tmp);
+	printf("INT64 ADD OVERFLOW PASSED\n");
+	tmp = json_object_new_int64(INT64_MIN);
+	json_object_add_int64(tmp, -100);
+	assert(json_object_get_int64(tmp) == INT64_MIN);
+	json_object_put(tmp);
+	printf("INT64 ADD UNDERFLOW PASSED\n");
+
+	printf("PASSED\n");
+	return 0;
+}

tests/test_int_add.expected

@@ -0,0 +1,7 @@
+INT ADD PASSED
+INT ADD OVERFLOW PASSED
+INT ADD UNDERFLOW PASSED
+INT64 ADD PASSED
+INT64 ADD OVERFLOW PASSED
+INT64 ADD UNDERFLOW PASSED
+PASSED

tests/test_int_add.test

@@ -0,0 +1 @@
+test_basic.test