extern void sha1_end(hctx *, const uschar *, int, uschar *);
extern void sha1_mid(hctx *, const uschar *);
extern void sha1_start(hctx *);
-extern void show_string(BOOL, gstring *);
extern int sieve_interpret(uschar *, int, uschar *, uschar *, uschar *,
uschar *, address_item **, uschar **);
extern void sigalrm_handler(int);