strings/json: Add string delimter match, and object create with vars methods

Add a function to check if there is an exact match a one string between
delimiters in another string.

Add a function that will create an ast_json object out of a list of
Asterisk variables. An excludes string can also optionally be passed
in.

Also, add a macro to make it easier to get object integers.

Change-Id: I5f34f18e102126aef3997f19a553a266d70d6226

include/asterisk/json.h

@@ -538,6 +538,15 @@ int ast_json_array_extend(struct ast_json *array, struct ast_json *tail);
  */
 struct ast_json *ast_json_object_create(void);
 
+/*!
+ * \brief Create a new JSON object using the given variables
+ * \param variables A list of Asterisk variables
+ * \param excludes Comma separated string of variable names to exclude (optional)
+ * \return Newly allocated object.
+ * \return \c NULL on error.
+ */
+struct ast_json *ast_json_object_create_vars(const struct ast_variable *variables, const char *excludes);
+
 /*!
  * \brief Get size of JSON object.
  * \since 12.0.0
@@ -572,6 +581,14 @@ struct ast_json *ast_json_object_get(struct ast_json *object, const char *key);
  */
 #define ast_json_object_string_get(object, key) ast_json_string_get(ast_json_object_get(object, key))
 
+/*!
+ * \brief Get an integer field from a JSON object.
+ * \param integer JSON integer.
+ * \return Value of a JSON integer.
+ * \return 0 if \a integer is not a JSON integer.
+ */
+#define ast_json_object_integer_get(object, key) ast_json_integer_get(ast_json_object_get(object, key))
+
 /*!
  * \brief Set a field in a JSON object.
  * \since 12.0.0

include/asterisk/strings.h

@@ -400,6 +400,19 @@ void ast_copy_string(char *dst, const char *src, size_t size),
 }
 )
 
+/*!
+ * \brief Check if there is an exact match for 'needle' between delimiters in 'haystack'.
+ *
+ * \note This will skip extra leading spaces between delimiters.
+ *
+ * \param needle The string to search for
+ * \param haystack The string searched in
+ * \param delim The haystack delimiter
+ *
+ * \return True if an exact match for needle is in haystack, false otherwise
+ */
+int ast_in_delimited_string(const char *needle, const char *haystack, char delim);
+
 /*!
   \brief Build a string in a buffer, designed to be called repeatedly