Duplicate fix of Kevin Lyles's bug from r7092.

git-svn-id: svn://svn.tartarus.org/sgt/library@7094 cda61777-01e9-0310-a592-d414129be87e

diff --git a/tree234.c b/tree234.c
index bc88039..257c978 100644 (file)
--- a/tree234.c
+++ b/tree234.c
@@ -1440,8 +1440,11 @@ tree234 *copytree234(tree234 *t, copyfn234 copyfn, void *copyfnstate) {
     tree234 *t2;
 
     t2 = newtree234(t->cmp);
-    t2->root = copynode234(t->root, copyfn, copyfnstate);
-    t2->root->parent = NULL;
+    if (t->root) {
+       t2->root = copynode234(t->root, copyfn, copyfnstate);
+       t2->root->parent = NULL;
+    } else
+       t2->root = NULL;
 
     return t2;
 }
@@ -2122,11 +2125,12 @@ int main(void) {
     tree = newtree234(mycmp);
     cmp = mycmp;
     arraylen = 0;
-    for (i = 0; i < 16; i++) {
-       addtest(strings[i]);
+    for (i = 0; i < 17; i++) {
        tree2 = copytree234(tree, NULL, NULL);
        splittest(tree2, array, arraylen);
        freetree234(tree2);
+       if (i < 16)
+           addtest(strings[i]);
     }
     freetree234(tree);