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diff --git a/nsframework/framework_unified/client/NS_MessageQueue/src/ns_mq_string.c b/nsframework/framework_unified/client/NS_MessageQueue/src/ns_mq_string.c
new file mode 100755
index 0000000..8749a99
--- /dev/null
+++ b/nsframework/framework_unified/client/NS_MessageQueue/src/ns_mq_string.c
@@ -0,0 +1,60 @@
+/*
+ * @copyright Copyright (c) 2016-2020 TOYOTA MOTOR CORPORATION.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <string.h>
+#include <native_service/ns_logger_if.h>
+
+size_t strlcpy(char *dst, const char *src, size_t siz) {
+  if (dst == NULL) {
+    FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "dst is NULL");
+    return 0;
+  }
+  if (src == NULL) {
+    FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "src is NULL");
+    return 0;
+  }
+  size_t ret = strlen(src);
+
+  if (siz) {
+    size_t len = (ret >= siz) ? siz - 1 : ret;
+    memcpy(dst, src, len);
+    dst[len] = '\0';
+  }
+  return ret;
+}
+
+size_t strlcat(char *dst, const char *src, size_t siz) {
+  if (dst == NULL) {
+    FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "dst is NULL");
+    return 0;
+  }
+  if (src == NULL) {
+    FRAMEWORKUNIFIEDLOG(ZONE_NS_ERR, __func__, "src is NULL");
+    return 0;
+  }
+  size_t dsiz = strlen(dst);
+  size_t len = strlen(src);
+  size_t res = dsiz + len;
+
+  dst += dsiz;
+  siz -= dsiz;
+  if (len >= siz) {
+    len = siz - 1;
+  }
+  memcpy(dst, src, len);
+  dst[len] = '\0';
+  return res;
+}