Add xxx_ex API to solove some problems

01. solve the segment error caused by the s2j_struct_get_basic_element's from_json being null. 02. add the default value option of the parameter.
1847123212 · Feb 23, 2020 · 7ca54d8 · 7ca54d8
1 parent a51e9ab
commit 7ca54d8
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Showing 3 changed files with 87 additions and 1 deletion.
diff --git a/demo/main.c b/demo/main.c
@@ -55,9 +55,15 @@ static void *json_to_struct(cJSON* json_obj) {
 
     /* deserialize data to Student structure object. */
     s2j_struct_get_basic_element(struct_student, json_obj, int, id);
+#if 1
     s2j_struct_get_array_element(struct_student, json_obj, int, score);
     s2j_struct_get_basic_element(struct_student, json_obj, string, name);
     s2j_struct_get_basic_element(struct_student, json_obj, double, weight);
+#else // another xxx_ex api, add default value and more secure
+    s2j_struct_get_array_element_ex(struct_student, json_obj, int, score, 8, 0);
+    s2j_struct_get_basic_element_ex(struct_student, json_obj, string, name, "John");
+    s2j_struct_get_basic_element_ex(struct_student, json_obj, double, weight, 0);
+#endif
 
     /* deserialize data to Student.Hometown structure object. */
     s2j_struct_get_struct_element(struct_hometown, struct_student, json_hometown, json_obj, Hometown, hometown);

diff --git a/struct2json/inc/s2j.h b/struct2json/inc/s2j.h
@@ -38,7 +38,7 @@ extern "C" {
 #endif
 
 /* struct2json software version number */
-#define S2J_SW_VERSION                "1.0.3"
+#define S2J_SW_VERSION                "1.0.4"
 
 /* Create JSON object */
 #define s2j_create_json_obj(json_obj) \
@@ -71,11 +71,16 @@ extern "C" {
 /* Get basic type element for structure object */
 #define s2j_struct_get_basic_element(to_struct, from_json, type, element) \
     S2J_STRUCT_GET_BASIC_ELEMENT(to_struct, from_json, type, element)
+#define s2j_struct_get_basic_element_ex(to_struct, from_json, type, element, _defval) \
+    S2J_STRUCT_GET_BASIC_ELEMENT_EX(to_struct, from_json, type, element, _defval)
 
 /* Get array type element for structure object */
 #define s2j_struct_get_array_element(to_struct, from_json, type, element) \
     S2J_STRUCT_GET_ARRAY_ELEMENT(to_struct, from_json, type, element)
 
+#define s2j_struct_get_array_element_ex(to_struct, from_json, type, element, size, _defval) \
+    S2J_STRUCT_GET_ARRAY_ELEMENT_EX(to_struct, from_json, type, element, size, _defval)
+
 /* Get child structure type element for structure object */
 #define s2j_struct_get_struct_element(child_struct, to_struct, child_json, from_json, type, element) \
     S2J_STRUCT_GET_STRUCT_ELEMENT(child_struct, to_struct, child_json, from_json, type, element)

diff --git a/struct2json/inc/s2jdef.h b/struct2json/inc/s2jdef.h
@@ -45,14 +45,47 @@ typedef struct {
     json_temp = cJSON_GetObjectItem(from_json, #_element); \
     if (json_temp) (to_struct)->_element = json_temp->valueint;
 
+#define S2J_STRUCT_GET_int_ELEMENT_EX(to_struct, from_json, _element, _defval) \
+    { \
+        if (from_json) { \
+            json_temp = cJSON_GetObjectItem(from_json, #_element); \
+            if (json_temp) (to_struct)->_element = json_temp->valueint; \
+            else (to_struct)->_element = _defval; \
+        } else { \
+            (to_struct)->_element = _defval; \
+        } \
+    }
+
 #define S2J_STRUCT_GET_string_ELEMENT(to_struct, from_json, _element) \
     json_temp = cJSON_GetObjectItem(from_json, #_element); \
     if (json_temp) strcpy((to_struct)->_element, json_temp->valuestring);
 
+#define S2J_STRUCT_GET_string_ELEMENT_EX(to_struct, from_json, _element, _defval) \
+    { \
+        if (from_json) { \
+            json_temp = cJSON_GetObjectItem(from_json, #_element); \
+            if (json_temp) strcpy((to_struct)->_element, json_temp->valuestring); \
+            else strcpy((to_struct)->_element, _defval); \
+        } else { \
+            strcpy((to_struct)->_element, _defval); \
+        } \
+    }
+
 #define S2J_STRUCT_GET_double_ELEMENT(to_struct, from_json, _element) \
     json_temp = cJSON_GetObjectItem(from_json, #_element); \
     if (json_temp) (to_struct)->_element = json_temp->valuedouble;
 
+#define S2J_STRUCT_GET_double_ELEMENT_EX(to_struct, from_json, _element, _defval) \
+    { \
+        if (from_json) { \
+            json_temp = cJSON_GetObjectItem(from_json, #_element); \
+            if (json_temp) (to_struct)->_element = json_temp->valuedouble; \
+            else (to_struct)->_element = _defval; \
+        } else { \
+            (to_struct)->_element = _defval; \
+        } \
+    }
+
 #define S2J_STRUCT_ARRAY_GET_int_ELEMENT(to_struct, from_json, _element, index) \
     (to_struct)->_element[index] = from_json->valueint;
 
@@ -65,6 +98,21 @@ typedef struct {
 #define S2J_STRUCT_ARRAY_GET_ELEMENT(to_struct, from_json, type, _element, index) \
     S2J_STRUCT_ARRAY_GET_##type##_ELEMENT(to_struct, from_json, _element, index)
 
+#define S2J_STRUCT_ARRAY_GET_int_ELEMENT_EX(to_struct, from_json, _element, index, _defval) \
+    if (from_json) (to_struct)->_element[index] = from_json->valueint; \
+    else (to_struct)->_element[index] = _defval; 
+
+#define S2J_STRUCT_ARRAY_GET_string_ELEMENT_EX(to_struct, from_json, _element, index, _defval) \
+    if (from_json) strcpy((to_struct)->_element[index], from_json->valuestring); \
+    else strcpy((to_struct)->_element[index], _defval); 
+
+#define S2J_STRUCT_ARRAY_GET_double_ELEMENT_EX(to_struct, from_json, _element, index) \
+    if (from_json) (to_struct)->_element[index] = from_json->valuedouble; \
+    else (to_struct)->_element[index] = _defval;
+
+#define S2J_STRUCT_ARRAY_GET_ELEMENT_EX(to_struct, from_json, type, _element, index, _defval) \
+    S2J_STRUCT_ARRAY_GET_##type##_ELEMENT_EX(to_struct, from_json, _element, index, _defval)
+
 #define S2J_JSON_SET_int_ELEMENT(to_json, from_struct, _element) \
     cJSON_AddNumberToObject(to_json, #_element, (from_struct)->_element);
 
@@ -125,6 +173,9 @@ typedef struct {
 #define S2J_STRUCT_GET_BASIC_ELEMENT(to_struct, from_json, type, _element) \
     S2J_STRUCT_GET_##type##_ELEMENT(to_struct, from_json, _element)
 
+#define S2J_STRUCT_GET_BASIC_ELEMENT_EX(to_struct, from_json, type, _element, _defval) \
+    S2J_STRUCT_GET_##type##_ELEMENT_EX(to_struct, from_json, _element, _defval)
+
 #define S2J_STRUCT_GET_ARRAY_ELEMENT(to_struct, from_json, type, _element) \
     { \
         cJSON *array, *array_element; \
@@ -139,6 +190,30 @@ typedef struct {
         } \
     }
 
+#define S2J_STRUCT_GET_ARRAY_ELEMENT_EX(to_struct, from_json, type, _element, size, _defval) \
+    { \
+        size_t index = 0, realsize = 0; \
+        if (from_json) { \
+            cJSON *array = NULL, *array_element = NULL; \
+            array = cJSON_GetObjectItem(from_json, #_element); \
+            if (array) { \
+                realsize = cJSON_GetArraySize(array); \
+                while (index < realsize) { \
+                    array_element = cJSON_GetArrayItem(array, index); \
+                    S2J_STRUCT_ARRAY_GET_ELEMENT_EX(to_struct, array_element, type, _element, index++, _defval); \
+                } \
+            } else { \
+                while (index < size) { \
+                    S2J_STRUCT_ARRAY_GET_ELEMENT_EX(to_struct, array_element, type, _element, index++, _defval); \
+                } \
+            } \
+        } else { \
+            while (index < size) { \
+                S2J_STRUCT_ARRAY_GET_ELEMENT_EX(to_struct, from_json, type, _element, index++, _defval); \
+            } \
+        } \
+    }
+
 #define S2J_STRUCT_GET_STRUCT_ELEMENT(child_struct, to_struct, child_json, from_json, type, _element) \
     type *child_struct = &((to_struct)->_element); \
     cJSON *child_json = cJSON_GetObjectItem(from_json, #_element);