seg fault for empty subarguments

[Joel E. Denny]

I committed this.

Index: ChangeLog
===================================================================
RCS file: /sources/bison/bison/ChangeLog,v
retrieving revision 1.1595
diff -p -u -r1.1595 ChangeLog
--- ChangeLog   22 Oct 2006 00:28:16 -0000      1.1595
+++ ChangeLog   31 Oct 2006 22:22:55 -0000
@@ -1,3 +1,8 @@
+2006-10-31  Joel E. Denny  <address@hidden>
+
+       * src/getargs.c (flags_argmatch): Don't cause segmentation fault for
+       empty subargument list.  For example: `bison  --warnings=  parser.y'.
+
 2006-10-21  Joel E. Denny  <address@hidden>
 
        * data/push.c, data/yacc.c: Make sure there's a newline at the end of
Index: src/getargs.c
===================================================================
RCS file: /sources/bison/bison/src/getargs.c,v
retrieving revision 1.81
diff -p -u -r1.81 getargs.c
--- src/getargs.c       12 Oct 2006 23:29:52 -0000      1.81
+++ src/getargs.c       31 Oct 2006 22:22:55 -0000
@@ -91,15 +91,15 @@ flags_argmatch (const char *option,
   if (args)
     {
       args = strtok (args, ",");
-      do
+      while (args)
        {
          int value = XARGMATCH (option, args, keys, values);
          if (value == 0)
            *flags = 0;
          else
            *flags |= value;
+          args = strtok (NULL, ",");
        }
-      while ((args = strtok (NULL, ",")));
     }
   else
     *flags = ~0;