dialog: api function get pkg-allocated duplicate of dlg var value

src/modules/dialog/dlg_cb.h

@@ -42,7 +42,7 @@ struct dlg_cb_params {
 };
 
 /* callback function prototype */
-typedef void (dialog_cb) (struct dlg_cell* dlg, int type, 
+typedef void (dialog_cb) (struct dlg_cell* dlg, int type,
 		struct dlg_cb_params * params);
 /* function to free the callback param */
 typedef void (param_free_cb) (void *param);
@@ -60,6 +60,9 @@ typedef str* (*get_dlg_varref_f)( struct dlg_cell* dlg,
 /* method to get a variable from a dialog */
 typedef int (*get_dlg_varval_f)( struct dlg_cell* dlg,
                                     str* key, str* val);
+/* method to get a variable value duplicate from a dialog */
+typedef int (*get_dlg_vardup_f)( struct dlg_cell* dlg,
+                                    str* key, str* val);
 
 #define CONFIRMED_DIALOG_STATE 1
 

src/modules/dialog/dlg_load.h

@@ -48,6 +48,7 @@ struct dlg_binds {
     set_dlg_variable_f set_dlg_var;
 	get_dlg_varref_f   get_dlg_varref;
 	get_dlg_varval_f   get_dlg_varval;
+	get_dlg_vardup_f   get_dlg_vardup;
 	get_dlg_f          get_dlg;
 	release_dlg_f      release_dlg;
 };

src/modules/dialog/dlg_var.c

@@ -342,6 +342,40 @@ int get_dlg_varval(struct dlg_cell *dlg, str *key, str *val)
 	return -2;
 }
 
+/**
+ * set *val to a pkg-allocated buffer where the dlg value is cloned
+ * - val->s has to be pkg-freed after use
+ */
+int get_dlg_vardup(struct dlg_cell *dlg, str *key, str *val)
+{
+	str *var = NULL;
+
+	val->s = NULL;
+	val->len = 0;
+
+	if( !dlg || !key || key->len<=0) {
+		LM_ERR("BUG - bad parameters\n");
+		return -1;
+	}
+
+	dlg_lock(d_table, &(d_table->entries[dlg->h_entry]));
+	var = get_dlg_variable_unsafe(dlg, key);
+	if(var && var->s) {
+		val->s = (char*)pkg_malloc(var->len + 1);
+		if(val->s!=NULL) {
+			memcpy(val->s, var->s, var->len);
+			val->len = var->len;
+			val->s[val->len] = '\0';
+		}
+	}
+	dlg_unlock(d_table, &(d_table->entries[dlg->h_entry]));
+
+	if(val->s) {
+		return 0;
+	}
+	return -2;
+}
+
 int get_dlg_variable_uintval(struct dlg_cell *dlg, str *key, unsigned int *uval)
 {
 	str* var = NULL;

src/modules/dialog/dlg_var.h

@@ -61,6 +61,7 @@ typedef struct dlg_var {
 
 str* get_dlg_varref(dlg_cell_t *dlg, str *key);
 int get_dlg_varval(dlg_cell_t *dlg, str *key, str *val);
+int get_dlg_vardup(dlg_cell_t *dlg, str *key, str *val);
 int set_dlg_variable(dlg_cell_t *dlg, str *key, str *val);
 
 int get_dlg_variable_uintval(struct dlg_cell *dlg, str *key, unsigned int *uval);