From c26d53f0d74b10b4f8fb290ee663cfdd14d0115a Mon Sep 17 00:00:00 2001
From: Max Bruckner <max@maxbruckner.de>
Date: Sun, 26 Feb 2017 14:30:50 +0100
Subject: [PATCH] Helper function to check the type of an item

This is necessary, because you can get it wrong if you do it manually.
(when you forget the & 0xFF in the comparison)
---
 cJSON.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 cJSON.h |  12 +++++++
 2 files changed, 112 insertions(+)

diff --git a/cJSON.c b/cJSON.c
index cf43ce9..39593b7 100644
--- a/cJSON.c
+++ b/cJSON.c
@@ -2149,3 +2149,103 @@ void cJSON_Minify(char *json)
     /* and null-terminate. */
     *into = '\0';
 }
+
+extern cjbool cJSON_IsInvalid(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_Invalid;
+}
+
+extern cjbool cJSON_IsFalse(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_False;
+}
+
+extern cjbool cJSON_IsTrue(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xff) == cJSON_True;
+}
+
+
+extern cjbool cJSON_IsBool(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & (cJSON_True | cJSON_False)) != 0;
+}
+extern cjbool cJSON_IsNull(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_NULL;
+}
+
+extern cjbool cJSON_IsNumber(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_Number;
+}
+
+extern cjbool cJSON_IsString(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_String;
+}
+
+extern cjbool cJSON_IsArray(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_Array;
+}
+
+extern cjbool cJSON_IsObject(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_Object;
+}
+
+extern cjbool cJSON_IsRaw(const cJSON * const item)
+{
+    if (item == NULL)
+    {
+        return false;
+    }
+
+    return (item->type & 0xFF) == cJSON_Raw;
+}
diff --git a/cJSON.h b/cJSON.h
index de1f69f..831df39 100644
--- a/cJSON.h
+++ b/cJSON.h
@@ -109,6 +109,18 @@ extern int cJSON_HasObjectItem(const cJSON *object, const char *string);
 /* For analysing failed parses. This returns a pointer to the parse error. You'll probably need to look a few chars back to make sense of it. Defined when cJSON_Parse() returns 0. 0 when cJSON_Parse() succeeds. */
 extern const char *cJSON_GetErrorPtr(void);
 
+/* These functions check the type of an item */
+extern int cJSON_IsInvalid(const cJSON * const item);
+extern int cJSON_IsFalse(const cJSON * const item);
+extern int cJSON_IsTrue(const cJSON * const item);
+extern int cJSON_IsBool(const cJSON * const item);
+extern int cJSON_IsNull(const cJSON * const item);
+extern int cJSON_IsNumber(const cJSON * const item);
+extern int cJSON_IsString(const cJSON * const item);
+extern int cJSON_IsArray(const cJSON * const item);
+extern int cJSON_IsObject(const cJSON * const item);
+extern int cJSON_IsRaw(const cJSON * const item);
+
 /* These calls create a cJSON item of the appropriate type. */
 extern cJSON *cJSON_CreateNull(void);
 extern cJSON *cJSON_CreateTrue(void);