tolerate NDV (no directional validation) in METAR

diff --git a/simgear/environment/metar.cxx b/simgear/environment/metar.cxx
index 2f5280e6081db322264d4347b9714bfaa74e6c26..3879bb7d5ef6a7a4ab6d137a600c7faf5d8bb1f9 100644 (file)
--- a/simgear/environment/metar.cxx
+++ b/simgear/environment/metar.cxx
@@ -466,11 +466,13 @@ bool SGMetar::scanVisibility()
        int modifier = SGMetarVisibility::EQUALS;
 // \d{4}(N|NE|E|SE|S|SW|W|NW)?
        if (scanNumber(&m, &i, 4)) {
-               if (*m == 'E')
+               if( strncmp( m, "NDV",3 ) == 0 ) {
+                       m+=3; // tolerate NDV (no directional validation)
+               } else if (*m == 'E') {
                        m++, dir = 90;
-               else if (*m == 'W')
+               } else if (*m == 'W') {
                        m++, dir = 270;
-               else if (*m == 'N') {
+               } else if (*m == 'N') {
                        m++;
                        if (*m == 'E')
                                m++, dir = 45;
@@ -486,7 +488,7 @@ bool SGMetar::scanVisibility()
                                m++, dir = 225;
                        else
                                dir = 180;
-               }
+                }
                if (i == 0)
                        i = 50, modifier = SGMetarVisibility::LESS_THAN;
                else if (i == 9999)