json: Add UTF-8 check call.

Since the json library does not make the check function public we
recreate/copy the function in our interface module.

ASTERISK-26466
Reported by: Richard Mudgett

Change-Id: I36d3d750b6f5f1a110bc69ea92b435ecdeeb2a99

1 files changed, 35 insertions, 0 deletions

diff --git a/include/asterisk/json.h b/include/asterisk/json.h
index 28ebfbd51..cfd9a2997 100644
--- a/include/asterisk/json.h
+++ b/include/asterisk/json.h
@@ -217,6 +217,41 @@ const char *ast_json_typename(enum ast_json_type type);
 /*!@{*/
 
 /*!
+ * \brief Check the string of the given length for UTF-8 format.
+ * \since 13.12.0
+ *
+ * \param str String to check.
+ * \param len Length of string to check.
+ *
+ * \retval 0 if not UTF-8 encoded or str is NULL.
+ * \retval 1 if UTF-8 encoded.
+ */
+int ast_json_utf8_check_len(const char *str, size_t len);
+
+/*!
+ * \brief Check the nul terminated string for UTF-8 format.
+ * \since 13.12.0
+ *
+ * \param str String to check.
+ *
+ * \retval 0 if not UTF-8 encoded or str is NULL.
+ * \retval 1 if UTF-8 encoded.
+ */
+int ast_json_utf8_check(const char *str);
+
+/*!
+ * \brief Check str for UTF-8 and replace with an empty string if fails the check.
+ *
+ * \note The convenience macro is normally used with ast_json_pack()
+ * or a function wrapper that calls ast_json_vpack().
+ */
+#define AST_JSON_UTF8_VALIDATE(str) (ast_json_utf8_check(str) ? (str) : "")
+
+/*!@}*/
+
+/*!@{*/
+
+/*!
  * \brief Get the JSON true value.
  * \since 12.0.0
  *