Warn in neato -n2 if edge pos attributes have syntax problems

diff --git a/lib/neatogen/neatoinit.c b/lib/neatogen/neatoinit.c
index 0a7bf66bf1dfd7f6cfcf2c9b3c0239f43471b5f2..24b07e5c42b6a3e32f6add17b827eb7e9a920cdc 100644 (file)
--- a/lib/neatogen/neatoinit.c
+++ b/lib/neatogen/neatoinit.c
@@ -317,6 +317,7 @@ static int user_spline(attrsym_t * E_pos, edge_t * e)
     bezier *newspl;
     int more = 1;
     int stype, etype;
+    static boolean warned;
 
 #ifndef WITH_CGRAPH
     pos = agxget(e, E_pos->index);
@@ -350,6 +351,14 @@ static int user_spline(attrsym_t * E_pos, edge_t * e)
        n = npts;
        if ((n < 4) || (n % 3 != 1)) {
            gv_free_splines(e);
+           if (!warned) {
+               warned = 1;
+#ifndef WITH_CGRAPH
+               agerr(AGWARN, "pos attribute for edge (%s,%s) doesn't have 3n+1 points\n", e->tail->name, e->head->name);
+#else
+               agerr(AGWARN, "pos attribute for edge (%s,%s) doesn't have 3n+1 points\n", agnameof(agtail(e)), agnameof(aghead(e)));
+#endif
+           }
            return 0;
        }
        ps = ALLOC(n, 0, pointf);
@@ -357,6 +366,14 @@ static int user_spline(attrsym_t * E_pos, edge_t * e)
        while (n) {
            i = sscanf(pos, "%lf,%lf%n", &x, &y, &nc);
            if (i < 2) {
+               if (!warned) {
+                   warned = 1;
+#ifndef WITH_CGRAPH
+                   agerr(AGWARN, "syntax error in pos attribute for edge (%s,%s)\n", e->tail->name, e->head->name);
+#else
+                   agerr(AGWARN, "syntax error in pos attribute for edge (%s,%s)\n", agnameof(agtail(e)), agnameof(aghead(e)));
+#endif
+               }
                free(ps);
                gv_free_splines(e);
                return 0;