Reporter:  Warren Jones <wjones@tc.fluke.com> Tue Mar 26 17:28:31 1996

Attempting to replace part of a file pathname with a null string
causes SWISH to dump core.  For example:

    ReplaceRules replace "/www/docs" ""

As a workaround, I did this instead:

    ReplaceRules replace "/www/docs/" "/"

The problem is that the null string is completely discarded
at file.c line 277, leaving the "replace" directive with
only one parameter:

    if (!skiplen | value[0] == '\0' || value[0] == '\n')
        break;     ^^^^^^^^^^^^^^^^

This eventually leads to a seg fault when you try to dereference
the (nonexistent) second parameter at line 988 of index.c:

    strcpy(line2, tmplist->line);  /* tmplist == NULL */

An incidental quibble -- Did you really want to say:
 
    !skiplen | value[0] == '\0' ...

rather than:

    !skiplen || value[0] == '\0' ...

I think the two are equivalent in this context, but I scratched
my head over the bitwise "|" before I decided it was probably OK.