* src/nsterm.m (ns_select): Fix off-by-one error, and add assertion

diff --git a/src/nsterm.m b/src/nsterm.m
index 161677484f95ffbe793682525946146ac07ee873..1a23fc6912ccac2e02721df028fba5dd5ebc52d8 100644 (file)
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -4697,7 +4697,8 @@ ns_select (int nfds, fd_set *readfds, fd_set *writefds,
       return -1;
     }
 
-  for (k = 0; k < nfds+1; k++)
+  eassert (nfds <= FD_SETSIZE);
+  for (k = 0; k < nfds; k++)
     {
       if (readfds && FD_ISSET(k, readfds)) ++nr;
       if (writefds && FD_ISSET(k, writefds)) ++nr;