Fix for rn w/ C News not chasing `Xref:'s

[Bob Thrush]

  After converting to C News from B News 2.11.14 with dbz, I noticed 
that rn was no longer marking cross-posted articles as read in the 
`Xref:'d newsgroups.  There were 2 problems associated with the fact 
that both rn (with DBM) and dbz.c v1.5 (as posted by Jon Zeeff) 
forced lower case article ids while C News and its version of dbz.c
wanted case insensitive ids. As a result, rn could no longer find 
cross-posted articles in chase_xrefs() in bits.c.

  The relevant change to rn is attached.  Your line nos. will
probably not match since I had to make other changes to get
my compiler to accept "bits.c".  Make sure that you #define
CNEWS to implement the change (I did it the Makefile).  The
dbz problem was corrected by using the C News version of libdbz.a.

*** bits.c	Wed Jul 26 22:46:31 1989
--- bits.c.orig	Wed Jul 26 22:46:28 1989
*** 323,331 ****
      {
  	datum lhs, rhs;
  	datum fetch();
- #ifndef CNEWS
  	register char *idp;
- #endif /* CNEWS */
  	char *ident_buf;
  	static FILE * hist_file = Nullfp;
  #else
--- 312,318 ----
***************
*** 364,375 ****
  	if (debug)
  	    printf ("chase_xref: Message-ID: %s\n", ident_buf);
  #endif
- #ifndef CNEWS
  	idp = ident_buf;
  	while (*++idp)			/* make message-id case insensitive */
  	    if (isupper(*idp))
  	        *idp = tolower (*idp);
- #endif /* CNEWS */
  	lhs.dptr = ident_buf;		/* look up article by id */
  	lhs.dsize = strlen(lhs.dptr) + 1;
  	rhs = fetch(lhs);		/* fetch the record */
-- 
Bob Thrush                 UUCP: uunet!tarpit!rd
Automation Intelligence,   1200 W. Colonial Drive, Orlando, Florida 32804