From 36a704e8b54b65e8414fd2a02d973e74a9256e1d Mon Sep 17 00:00:00 2001
From: Daniel-Constantin Mierla <miconda@gmail.com>
Date: Thu, 1 Oct 2015 09:11:11 +0200
Subject: [PATCH] core: pv - helper function to return empty string

---
 pvapi.c | 15 +++++++++++++++
 pvar.h  |  1 +
 2 files changed, 16 insertions(+)

diff --git a/pvapi.c b/pvapi.c
index 3918895c8b2..e9b557e12f8 100644
--- a/pvapi.c
+++ b/pvapi.c
@@ -608,6 +608,21 @@ int pv_get_null(struct sip_msg *msg, pv_param_t *param, pv_value_t *res)
 	return 0;
 }
 
+/**
+ *
+ */
+int pv_get_strempty(struct sip_msg *msg, pv_param_t *param, pv_value_t *res)
+{
+	if(res==NULL)
+		return -1;
+
+	res->rs = pv_str_empty;
+	res->ri = 0;
+	res->flags = PV_VAL_STR;
+	return 0;
+}
+
+
 /**
  *
  */
diff --git a/pvar.h b/pvar.h
index 3bdfe17bbe9..8cc84887a2c 100644
--- a/pvar.h
+++ b/pvar.h
@@ -210,6 +210,7 @@ str* pv_cache_get_name(pv_spec_t *spec);
 
 /*! \brief PV helper functions */
 int pv_get_null(struct sip_msg *msg, pv_param_t *param, pv_value_t *res);
+int pv_get_strempty(struct sip_msg *msg, pv_param_t *param, pv_value_t *res);
 
 int pv_get_uintval(struct sip_msg *msg, pv_param_t *param,
 		pv_value_t *res, unsigned int uival);