X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FMain%2Futil.cxx;h=3ba719688cdfa1a478460defe1d01b97e7d13aea;hb=5033779192e8152cfeba49a8890bc60044785f6b;hp=b61985ca62e4be35819f44c40ca945206959b225;hpb=ebf2e996e9a8b29da46a361c4339e412c7bcb2e8;p=flightgear.git

diff --git a/src/Main/util.cxx b/src/Main/util.cxx
index b61985ca6..3ba719688 100644
--- a/src/Main/util.cxx
+++ b/src/Main/util.cxx
@@ -147,7 +147,7 @@ fgGetLowPass (double current, double target, double timeratio)
 
 
 string
-fgUnescape(const char *s)
+fgUnescape (const char *s)
 {
     string r;
     while (*s) {
@@ -197,5 +197,27 @@ fgUnescape(const char *s)
     return r;
 }
 
+
+// Write out path to validation node and read it back in. A Nasal
+// listener is supposed to replace the path with a validated version
+// or an empty string otherwise.
+const char *fgValidatePath (const char *str, bool write)
+{
+    static SGPropertyNode_ptr r, w;
+    if (!r) {
+        r = fgGetNode("/sim/paths/validate/read", true);
+        r->setAttribute(SGPropertyNode::READ, true);
+        r->setAttribute(SGPropertyNode::WRITE, true);
+
+        w = fgGetNode("/sim/paths/validate/write", true);
+        w->setAttribute(SGPropertyNode::READ, true);
+        w->setAttribute(SGPropertyNode::WRITE, true);
+    }
+    SGPropertyNode *prop = write ? w : r;
+    prop->setStringValue(str);
+    const char *result = prop->getStringValue();
+    return result[0] ? result : 0;
+}
+
 // end of util.cxx