More NullXXX macro removal from Andy Lester

p4raw-id: //depot/perl@27238

18 files changed, 86 insertions, 89 deletions

diff --git a/cop.h b/cop.h
index f0429b17a9..92a61df96f 100644
--- a/cop.h
+++ b/cop.h
@@ -542,7 +542,7 @@ struct subst {
 	cx->sb_s		= s,					\
 	cx->sb_m		= m,					\
 	cx->sb_strend		= strend,				\
-	cx->sb_rxres		= Null(void*),				\
+	cx->sb_rxres		= NULL,					\
 	cx->sb_rx		= rx,					\
 	cx->cx_type		= CXt_SUBST;				\
 	rxres_save(&cx->sb_rxres, rx)
diff --git a/deb.c b/deb.c
index df2ccffaa4..e246b1aa34 100644
--- a/deb.c
+++ b/deb.c
@@ -225,11 +225,9 @@ Perl_deb_stack_all(pTHX)
 		 */
 
 		I32 i, stack_min, stack_max, mark_min, mark_max;
-		const PERL_CONTEXT *cx_n;
+		const PERL_CONTEXT *cx_n = NULL;
 		const PERL_SI *si_n;
 
-		cx_n = Null(PERL_CONTEXT*);
-
 		/* there's a separate stack per SI, so only search
 		 * this one */
 
@@ -257,7 +255,7 @@ Perl_deb_stack_all(pTHX)
 
 		si_n = si;
 		i = ix;
-		cx_n = Null(PERL_CONTEXT*);
+		cx_n = NULL;
 		for (;;) {
 		    i++;
 		    if (i > si_n->si_cxix) {
diff --git a/doio.c b/doio.c
index dfd48d2d8b..00c29b1937 100644
--- a/doio.c
+++ b/doio.c
@@ -65,8 +65,8 @@ Perl_do_openn(pTHX_ GV *gv, register const char *oname, I32 len, int as_raw,
 {
     dVAR;
     register IO * const io = GvIOn(gv);
-    PerlIO *saveifp = Nullfp;
-    PerlIO *saveofp = Nullfp;
+    PerlIO *saveifp = NULL;
+    PerlIO *saveofp = NULL;
     int savefd = -1;
     char savetype = IoTYPE_CLOSED;
     int writing = 0;
@@ -125,7 +125,7 @@ Perl_do_openn(pTHX_ GV *gv, register const char *oname, I32 len, int as_raw,
 			  "Warning: unable to close filehandle %s properly.\n",
 			  GvENAME(gv));
 	}
-	IoOFP(io) = IoIFP(io) = Nullfp;
+	IoOFP(io) = IoIFP(io) = NULL;
     }
 
     if (as_raw) {
@@ -704,7 +704,7 @@ Perl_do_openn(pTHX_ GV *gv, register const char *oname, I32 len, int as_raw,
 	    *s = 'w';
 	    if (!(IoOFP(io) = PerlIO_openn(aTHX_ type,s,fd,0,0,NULL,0,svp))) {
 		PerlIO_close(fp);
-		IoIFP(io) = Nullfp;
+		IoIFP(io) = NULL;
 		goto say_false;
 	    }
 	}
@@ -755,7 +755,7 @@ Perl_nextargv(pTHX_ register GV *gv)
     PL_lastfd = -1;
     PL_filemode = 0;
     if (!GvAV(gv))
-        return Nullfp;
+	return NULL;
     while (av_len(GvAV(gv)) >= 0) {
 	STRLEN oldlen;
 	sv = av_shift(GvAV(gv));
@@ -763,7 +763,7 @@ Perl_nextargv(pTHX_ register GV *gv)
 	sv_setsv(GvSVn(gv),sv);
 	SvSETMAGIC(GvSV(gv));
 	PL_oldname = SvPVx(GvSV(gv), oldlen);
-	if (do_open(gv,PL_oldname,oldlen,PL_inplace!=0,O_RDONLY,0,Nullfp)) {
+	if (do_open(gv,PL_oldname,oldlen,PL_inplace!=0,O_RDONLY,0,NULL)) {
 	    if (PL_inplace) {
 		TAINT_PROPER("inplace open");
 		if (oldlen == 1 && *PL_oldname == '-') {
@@ -834,7 +834,7 @@ Perl_nextargv(pTHX_ register GV *gv)
 		    (void)PerlLIO_unlink(SvPVX_const(sv));
 		    (void)PerlLIO_rename(PL_oldname,SvPVX_const(sv));
 		    do_open(gv,(char*)SvPVX_const(sv),SvCUR(sv),PL_inplace!=0,
-			    O_RDONLY,0,Nullfp);
+			    O_RDONLY,0,NULL);
 #endif /* DOSISH */
 #else
 		    (void)UNLINK(SvPVX_const(sv));
@@ -871,11 +871,11 @@ Perl_nextargv(pTHX_ register GV *gv)
 		SETERRNO(0,0);		/* in case sprintf set errno */
 #ifdef VMS
 		if (!do_open(PL_argvoutgv,(char*)SvPVX_const(sv),SvCUR(sv),
-			     PL_inplace!=0,O_WRONLY|O_CREAT|O_TRUNC,0,Nullfp))
+			     PL_inplace!=0,O_WRONLY|O_CREAT|O_TRUNC,0,NULL))
 #else
 		    if (!do_open(PL_argvoutgv,(char*)SvPVX_const(sv),SvCUR(sv),
 			     PL_inplace!=0,O_WRONLY|O_CREAT|OPEN_EXCL,0666,
-			     Nullfp))
+			     NULL))
 #endif
 		{
 		    if (ckWARN_d(WARN_INPLACE))	
@@ -933,11 +933,11 @@ Perl_nextargv(pTHX_ register GV *gv)
 	    GV *oldout = (GV*)av_pop(PL_argvout_stack);
 	    setdefout(oldout);
 	    SvREFCNT_dec(oldout);
-	    return Nullfp;
+	    return NULL;
 	}
 	setdefout(gv_fetchpvs("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO));
     }
-    return Nullfp;
+    return NULL;
 }
 
 /* explicit renamed to avoid C++ conflict    -- kja */
@@ -1004,7 +1004,7 @@ Perl_io_close(pTHX_ IO *io, bool not_implicit)
 		retval = (PerlIO_close(IoIFP(io)) != EOF && !prev_err);
 	    }
 	}
-	IoOFP(io) = IoIFP(io) = Nullfp;
+	IoOFP(io) = IoIFP(io) = NULL;
     }
     else if (not_implicit) {
 	SETERRNO(EBADF,SS_IVCHAN);
@@ -1425,7 +1425,7 @@ Perl_do_execfree(pTHX)
 {
     dVAR;
     Safefree(PL_Argv);
-    PL_Argv = Null(char **);
+    PL_Argv = NULL;
     Safefree(PL_Cmd);
     PL_Cmd = NULL;
 }
@@ -2439,7 +2439,7 @@ Perl_start_glob (pTHX_ SV *tmpglob, IO *io)
 #endif /* !DOSISH */
 #endif /* MACOS_TRADITIONAL */
     (void)do_open(PL_last_in_gv, (char*)SvPVX_const(tmpcmd), SvCUR(tmpcmd),
-		  FALSE, O_RDONLY, 0, Nullfp);
+		  FALSE, O_RDONLY, 0, NULL);
     fp = IoIFP(io);
 #endif /* !VMS */
     LEAVE;
diff --git a/doop.c b/doop.c
index 847b18ee9a..0e9ddf1260 100644
--- a/doop.c
+++ b/doop.c
@@ -722,7 +722,7 @@ Perl_do_sprintf(pTHX_ SV *sv, I32 len, SV **sarg)
     SvUTF8_off(sv);
     if (DO_UTF8(*sarg))
         SvUTF8_on(sv);
-    sv_vsetpvfn(sv, pat, patlen, Null(va_list*), sarg + 1, len - 1, &do_taint);
+    sv_vsetpvfn(sv, pat, patlen, NULL, sarg + 1, len - 1, &do_taint);
     SvSETMAGIC(sv);
     if (do_taint)
 	SvTAINTED_on(sv);
diff --git a/hv.c b/hv.c
index 6be56dba4f..f68f38c56c 100644
--- a/hv.c
+++ b/hv.c
@@ -124,7 +124,7 @@ Perl_free_tied_hv_pool(pTHX)
 	he = HeNEXT(he);
 	del_HE(ohe);
     }
-    PL_hv_fetch_ent_mh = Nullhe;
+    PL_hv_fetch_ent_mh = NULL;
 }
 
 #if defined(USE_ITHREADS)
@@ -154,7 +154,7 @@ Perl_he_dup(pTHX_ const HE *e, bool shared, CLONE_PARAMS* param)
     HE *ret;
 
     if (!e)
-	return Nullhe;
+	return NULL;
     /* look for it in the table first */
     ret = (HE*)ptr_table_fetch(PL_ptr_table, e);
     if (ret)
@@ -473,7 +473,7 @@ S_hv_fetch_common(pTHX_ HV *hv, SV *keysv, const char *key, STRLEN klen,
 		    Newx(k, HEK_BASESIZE + sizeof(SV*), char);
 		    HeKEY_hek(entry) = (HEK*)k;
 		}
-		HeNEXT(entry) = Nullhe;
+		HeNEXT(entry) = NULL;
 		HeSVKEY_set(entry, keysv);
 		HeVAL(entry) = sv;
 		sv_upgrade(sv, SVt_PVLV);
@@ -585,7 +585,7 @@ S_hv_fetch_common(pTHX_ HV *hv, SV *keysv, const char *key, STRLEN klen,
 		if (!HvARRAY(hv) && !needs_store) {
 		    if (flags & HVhek_FREEKEY)
 			Safefree(key);
-		    return Nullhe;
+		    return NULL;
 		}
 #ifdef ENV_IS_CASELESS
 		else if (mg_find((SV*)hv, PERL_MAGIC_env)) {
@@ -668,7 +668,7 @@ S_hv_fetch_common(pTHX_ HV *hv, SV *keysv, const char *key, STRLEN klen,
     masked_flags = (flags & HVhek_MASK);
 
 #ifdef DYNAMIC_ENV_FETCH
-    if (!HvARRAY(hv)) entry = Null(HE*);
+    if (!HvARRAY(hv)) entry = NULL;
     else
 #endif
     {
@@ -1718,7 +1718,7 @@ S_hfreeentries(pTHX_ HV *hv)
 		hv_free_ent(hv, entry);
 	    }
 	    iter->xhv_riter = -1; 	/* HvRITER(hv) = -1 */
-	    iter->xhv_eiter = Null(HE*); /* HvEITER(hv) = Null(HE*) */
+	    iter->xhv_eiter = NULL;	/* HvEITER(hv) = NULL */
 
 	    /* There are now no allocated pointers in the aux structure.  */
 
@@ -1838,7 +1838,7 @@ S_hv_auxinit(HV *hv) {
     iter = HvAUX(hv);
 
     iter->xhv_riter = -1; 	/* HvRITER(hv) = -1 */
-    iter->xhv_eiter = Null(HE*); /* HvEITER(hv) = Null(HE*) */
+    iter->xhv_eiter = NULL;	/* HvEITER(hv) = NULL */
     iter->xhv_name = 0;
     iter->xhv_backreferences = 0;
     return iter;
@@ -1873,7 +1873,7 @@ Perl_hv_iterinit(pTHX_ HV *hv)
 	    hv_free_ent(hv, entry);
 	}
 	iter->xhv_riter = -1; 	/* HvRITER(hv) = -1 */
-	iter->xhv_eiter = Null(HE*); /* HvEITER(hv) = Null(HE*) */
+	iter->xhv_eiter = NULL; /* HvEITER(hv) = NULL */
     } else {
 	hv_auxinit(hv);
     }
@@ -2068,8 +2068,8 @@ Perl_hv_iternext_flags(pTHX_ HV *hv, I32 flags)
 	    SvREFCNT_dec(HeVAL(entry));
 	Safefree(HeKEY_hek(entry));
 	del_HE(entry);
-	iter->xhv_eiter = Null(HE*); /* HvEITER(hv) = Null(HE*) */
-	return Null(HE*);
+	iter->xhv_eiter = NULL; /* HvEITER(hv) = NULL */
+	return NULL;
     }
 #ifdef DYNAMIC_ENV_FETCH  /* set up %ENV for iteration */
     if (!entry && SvRMAGICAL((SV*)hv) && mg_find((SV*)hv, PERL_MAGIC_env)) {
diff --git a/intrpvar.h b/intrpvar.h
index 79ad7de40d..4c63b08042 100644
--- a/intrpvar.h
+++ b/intrpvar.h
@@ -203,7 +203,7 @@ PERLVAR(Imodglobal,	HV *)		/* per-interp module data */
 
 /* these used to be in global before 5.004_68 */
 PERLVARI(Iprofiledata,	U32 *,	NULL)	/* table of ops, counts */
-PERLVARI(Irsfp,	PerlIO * VOL,	Nullfp) /* current source file pointer */
+PERLVARI(Irsfp,	PerlIO * VOL,	NULL)	/* current source file pointer */
 PERLVARI(Irsfp_filters,	AV *,	NULL)	/* keeps active source filters */
 
 PERLVAR(Icompiling,	COP)		/* compiling/done executing marker */
diff --git a/mg.h b/mg.h
index a373defc99..2e1237446b 100644
--- a/mg.h
+++ b/mg.h
@@ -57,7 +57,6 @@ struct magic {
 				 SvPV_nolen_const((SV*)((mg)->mg_ptr)) :  \
 				 (const char*)(mg)->mg_ptr)
 
-#define SvTIED_mg(sv,how) \
-    (SvRMAGICAL(sv) ? mg_find((sv),(how)) : Null(MAGIC*))
+#define SvTIED_mg(sv,how) (SvRMAGICAL(sv) ? mg_find((sv),(how)) : NULL)
 #define SvTIED_obj(sv,mg) \
     ((mg)->mg_obj ? (mg)->mg_obj : sv_2mortal(newRV(sv)))
diff --git a/pad.c b/pad.c
index 50fa42c420..aa806ea95a 100644
--- a/pad.c
+++ b/pad.c
@@ -307,7 +307,7 @@ Perl_pad_undef(pTHX_ CV* cv)
 	SvREFCNT_dec(sv);
     }
     SvREFCNT_dec((SV*)CvPADLIST(cv));
-    CvPADLIST(cv) = Null(PADLIST*);
+    CvPADLIST(cv) = NULL;
 }
 
 
@@ -587,7 +587,7 @@ Perl_pad_findmy(pTHX_ const char *name)
     SV **name_svp;
 
     offset =  pad_findlex(name, PL_compcv, PL_cop_seqmax, 1,
-		Null(SV**), &out_sv, &out_flags);
+		NULL, &out_sv, &out_flags);
     if (offset != NOT_IN_PAD) 
 	return offset;
 
@@ -622,7 +622,7 @@ Perl_find_rundefsvoffset(pTHX)
     SV *out_sv;
     int out_flags;
     return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1,
-	    Null(SV**), &out_sv, &out_flags);
+	    NULL, &out_sv, &out_flags);
 }
 
 /*
@@ -812,7 +812,7 @@ S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn,
     /* out_capture non-null means caller wants us to capture lex; in
      * addition we capture ourselves unless it's an ANON/format */
     new_capturep = out_capture ? out_capture :
-		CvLATE(cv) ? Null(SV**) : &new_capture;
+		CvLATE(cv) ? NULL : &new_capture;
 
     offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1,
 		new_capturep, out_name_sv, out_flags);
@@ -867,7 +867,7 @@ S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn,
 
 	PL_comppad_name = ocomppad_name;
 	PL_comppad = ocomppad;
-	PL_curpad = ocomppad ? AvARRAY(ocomppad) : Null(SV **);
+	PL_curpad = ocomppad ? AvARRAY(ocomppad) : NULL;
     }
     return new_offset;
 }
diff --git a/pad.h b/pad.h
index 01370fecfd..62d4fb1d30 100644
--- a/pad.h
+++ b/pad.h
@@ -155,20 +155,20 @@ Restore the old pad saved into the local variable opad by PAD_SAVE_LOCAL()
 
 
 #define PAD_SAVE_SETNULLPAD()	SAVECOMPPAD(); \
-	PL_comppad = Null(PAD*); PL_curpad = Null(SV**);	\
+	PL_comppad = NULL; PL_curpad = NULL;	\
 	DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad set_null\n"));
 
 #define PAD_SAVE_LOCAL(opad,npad) \
 	opad = PL_comppad;					\
 	PL_comppad = (npad);					\
-	PL_curpad =  PL_comppad ? AvARRAY(PL_comppad) : Null(SV**); \
+	PL_curpad =  PL_comppad ? AvARRAY(PL_comppad) : NULL;	\
 	DEBUG_Xv(PerlIO_printf(Perl_debug_log,			\
 	      "Pad 0x%"UVxf"[0x%"UVxf"] save_local\n",		\
 	      PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
 
 #define PAD_RESTORE_LOCAL(opad) \
 	PL_comppad = opad;					\
-	PL_curpad =  PL_comppad ? AvARRAY(PL_comppad) : Null(SV**); \
+	PL_curpad =  PL_comppad ? AvARRAY(PL_comppad) : NULL;	\
 	DEBUG_Xv(PerlIO_printf(Perl_debug_log,			\
 	      "Pad 0x%"UVxf"[0x%"UVxf"] restore_local\n",	\
 	      PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
@@ -264,7 +264,7 @@ Clone the state variables associated with running and compiling pads.
 
 #define PAD_CLONE_VARS(proto_perl, param)				\
     PL_comppad = (AV *) ptr_table_fetch(PL_ptr_table, proto_perl->Icomppad); \
-    PL_curpad = PL_comppad ?  AvARRAY(PL_comppad) : Null(SV**);		\
+    PL_curpad = PL_comppad ?  AvARRAY(PL_comppad) : NULL;		\
     PL_comppad_name		= av_dup(proto_perl->Icomppad_name, param); \
     PL_comppad_name_fill	= proto_perl->Icomppad_name_fill;	\
     PL_comppad_name_floor	= proto_perl->Icomppad_name_floor;	\
diff --git a/perl.c b/perl.c
index 554e312727..b970bf348a 100644
--- a/perl.c
+++ b/perl.c
@@ -852,7 +852,7 @@ perl_destruct(pTHXx)
 
     if(PL_rsfp) {
 	(void)PerlIO_close(PL_rsfp);
-	PL_rsfp = Nullfp;
+	PL_rsfp = NULL;
     }
 
     /* Filters for program text */
@@ -4491,7 +4491,7 @@ S_init_lexer(pTHX)
     dVAR;
     PerlIO *tmpfp;
     tmpfp = PL_rsfp;
-    PL_rsfp = Nullfp;
+    PL_rsfp = NULL;
     lex_start(PL_linestr);
     PL_rsfp = tmpfp;
     PL_subname = newSVpvs("main");
diff --git a/pp_ctl.c b/pp_ctl.c
index 4833218adf..725920f296 100644
--- a/pp_ctl.c
+++ b/pp_ctl.c
@@ -75,7 +75,7 @@ PP(pp_regcomp)
     dSP;
     register PMOP *pm = (PMOP*)cLOGOP->op_other;
     SV *tmpstr;
-    MAGIC *mg = Null(MAGIC*);
+    MAGIC *mg = NULL;
 
     /* prevent recompiling under /o and ithreads. */
 #if defined(USE_ITHREADS)
@@ -133,7 +133,7 @@ PP(pp_regcomp)
 	{
 	    if (PM_GETRE(pm)) {
 	        ReREFCNT_dec(PM_GETRE(pm));
-		PM_SETRE(pm, Null(REGEXP*));	/* crucial if regcomp aborts */
+		PM_SETRE(pm, NULL);	/* crucial if regcomp aborts */
 	    }
 	    if (PL_op->op_flags & OPf_SPECIAL)
 		PL_reginterp_cnt = I32_MAX; /* Mark as safe.  */
@@ -383,7 +383,7 @@ Perl_rxres_free(pTHX_ void **rsp)
 	}
 #endif
 	Safefree(p);
-	*rsp = Null(void*);
+	*rsp = NULL;
     }
 }
 
@@ -3018,7 +3018,7 @@ S_check_type_and_open(pTHX_ const char *name, const char *mode)
     Stat_t st;
     const int st_rc = PerlLIO_stat(name, &st);
     if (st_rc < 0) {
-       return Nullfp;
+	return NULL;
     }
 
     if(S_ISDIR(st.st_mode) || S_ISBLK(st.st_mode)) {
@@ -3209,8 +3209,8 @@ PP(pp_require)
 				    if (IoOFP(io) && IoOFP(io) != IoIFP(io)) {
 					PerlIO_close(IoOFP(io));
 				    }
-				    IoIFP(io) = Nullfp;
-				    IoOFP(io) = Nullfp;
+				    IoIFP(io) = NULL;
+				    IoOFP(io) = NULL;
 				}
 			    }
 
diff --git a/pp_hot.c b/pp_hot.c
index 8f11e004be..677808f3f9 100644
--- a/pp_hot.c
+++ b/pp_hot.c
@@ -1070,8 +1070,8 @@ PP(pp_aassign)
 
     relem = firstrelem;
     lelem = firstlelem;
-    ary = Null(AV*);
-    hash = Null(HV*);
+    ary = NULL;
+    hash = NULL;
 
     while (lelem <= lastlelem) {
 	TAINT_NOT;		/* Each item stands on its own, taintwise. */
@@ -1555,7 +1555,7 @@ Perl_do_readline(pTHX)
 	    RETURN;
 	}
     }
-    fp = Nullfp;
+    fp = NULL;
     if (io) {
 	fp = IoIFP(io);
 	if (!fp) {
@@ -1564,7 +1564,7 @@ Perl_do_readline(pTHX)
 		    IoLINES(io) = 0;
 		    if (av_len(GvAVn(PL_last_in_gv)) < 0) {
 			IoFLAGS(io) &= ~IOf_START;
-			do_open(PL_last_in_gv,"-",1,FALSE,O_RDONLY,0,Nullfp);
+			do_open(PL_last_in_gv,"-",1,FALSE,O_RDONLY,0,NULL);
 			sv_setpvn(GvSVn(PL_last_in_gv), "-", 1);
 			SvSETMAGIC(GvSV(PL_last_in_gv));
 			fp = IoIFP(io);
@@ -3033,7 +3033,7 @@ PP(pp_method)
 	}
     }
 
-    SETs(method_common(sv, Null(U32*)));
+    SETs(method_common(sv, NULL));
     RETURN;
 }
 
diff --git a/pp_sys.c b/pp_sys.c
index 5437c627a3..d6055f255d 100644
--- a/pp_sys.c
+++ b/pp_sys.c
@@ -564,7 +564,7 @@ PP(pp_open)
     }
 
     tmps = SvPV_const(sv, len);
-    ok = do_openn(gv, tmps, len, FALSE, O_RDONLY, 0, Nullfp, MARK+1, (SP-MARK));
+    ok = do_openn(gv, tmps, len, FALSE, O_RDONLY, 0, NULL, MARK+1, (SP-MARK));
     SP = ORIGMARK;
     if (ok)
 	PUSHi( (I32)PL_forkprocess );
@@ -1070,7 +1070,7 @@ PP(pp_sselect)
 	timebuf.tv_usec = (long)(value * 1000000.0);
     }
     else
-	tbuf = Null(struct timeval*);
+	tbuf = NULL;
 
     for (i = 1; i <= 3; i++) {
 	sv = SP[i];
@@ -1511,7 +1511,7 @@ PP(pp_sysopen)
     /* Need TIEHANDLE method ? */
     const char * const tmps = SvPV_const(sv, len);
     /* FIXME? do_open should do const  */
-    if (do_open(gv, tmps, len, TRUE, mode, perm, Nullfp)) {
+    if (do_open(gv, tmps, len, TRUE, mode, perm, NULL)) {
 	IoLINES(GvIOp(gv)) = 0;
 	PUSHs(&PL_sv_yes);
     }
@@ -1942,7 +1942,7 @@ PP(pp_eof)
 		if ((IoFLAGS(io) & IOf_START) && av_len(GvAVn(gv)) < 0) {
 		    IoLINES(io) = 0;
 		    IoFLAGS(io) &= ~IOf_START;
-		    do_open(gv, "-", 1, FALSE, O_RDONLY, 0, Nullfp);
+		    do_open(gv, "-", 1, FALSE, O_RDONLY, 0, NULL);
 		    sv_setpvn(GvSV(gv), "-", 1);
 		    SvSETMAGIC(GvSV(gv));
 		}
@@ -2162,7 +2162,7 @@ PP(pp_ioctl)
     const unsigned int func = POPu;
     const int optype = PL_op->op_type;
     GV * const gv = (GV*)POPs;
-    IO * const io = gv ? GvIOn(gv) : Null(IO*);
+    IO * const io = gv ? GvIOn(gv) : NULL;
     char *s;
     IV retval;
 
@@ -2243,7 +2243,7 @@ PP(pp_flock)
     if (gv && (io = GvIO(gv)))
 	fp = IoIFP(io);
     else {
-	fp = Nullfp;
+	fp = NULL;
 	io = NULL;
     }
     /* XXX Looks to me like io is always NULL at this point */
@@ -4241,9 +4241,9 @@ PP(pp_time)
 {
     dVAR; dSP; dTARGET;
 #ifdef BIG_TIME
-    XPUSHn( time(Null(Time_t*)) );
+    XPUSHn( time(NULL) );
 #else
-    XPUSHi( time(Null(Time_t*)) );
+    XPUSHi( time(NULL) );
 #endif
     RETURN;
 }
diff --git a/scope.c b/scope.c
index 5939877a3f..afb8678013 100644
--- a/scope.c
+++ b/scope.c
@@ -296,7 +296,7 @@ Perl_save_ary(pTHX_ GV *gv)
     SSPUSHPTR(oav);
     SSPUSHINT(SAVEt_AV);
 
-    GvAV(gv) = Null(AV*);
+    GvAV(gv) = NULL;
     av = GvAVn(gv);
     if (SvMAGIC(oav))
 	mg_localize((SV*)oav, (SV*)av);
@@ -314,7 +314,7 @@ Perl_save_hash(pTHX_ GV *gv)
     SSPUSHPTR(ohv = GvHVn(gv));
     SSPUSHINT(SAVEt_HV);
 
-    GvHV(gv) = Null(HV*);
+    GvHV(gv) = NULL;
     hv = GvHVn(gv);
     if (SvMAGIC(ohv))
 	mg_localize((SV*)ohv, (SV*)hv);
@@ -887,7 +887,7 @@ Perl_leave_scope(pTHX_ I32 base)
 	    if (PL_comppad)
 		PL_curpad = AvARRAY(PL_comppad);
 	    else
-		PL_curpad = Null(SV**);
+		PL_curpad = NULL;
 	    break;
 	case SAVEt_PADSV:
 	    {
diff --git a/sv.c b/sv.c
index 4ba7b95bdb..30b84f088d 100644
--- a/sv.c
+++ b/sv.c
@@ -520,7 +520,7 @@ do_clean_all(pTHX_ SV *sv)
     SvFLAGS(sv) |= SVf_BREAK;
     if (PL_comppad == (AV*)sv) {
 	PL_comppad = NULL;
-	PL_curpad = Null(SV**);
+	PL_curpad = NULL;
     }
     SvREFCNT_dec(sv);
 }
@@ -6779,7 +6779,7 @@ Perl_vnewSVpvf(pTHX_ const char* pat, va_list* args)
     dVAR;
     register SV *sv;
     new_SV(sv);
-    sv_vsetpvfn(sv, pat, strlen(pat), args, Null(SV**), 0, Null(bool*));
+    sv_vsetpvfn(sv, pat, strlen(pat), args, NULL, 0, NULL);
     return sv;
 }
 
@@ -7784,7 +7784,7 @@ Usually used via its frontend C<sv_setpvf>.
 void
 Perl_sv_vsetpvf(pTHX_ SV *sv, const char* pat, va_list* args)
 {
-    sv_vsetpvfn(sv, pat, strlen(pat), args, Null(SV**), 0, Null(bool*));
+    sv_vsetpvfn(sv, pat, strlen(pat), args, NULL, 0, NULL);
 }
 
 /*
@@ -7817,7 +7817,7 @@ Usually used via its frontend C<sv_setpvf_mg>.
 void
 Perl_sv_vsetpvf_mg(pTHX_ SV *sv, const char* pat, va_list* args)
 {
-    sv_vsetpvfn(sv, pat, strlen(pat), args, Null(SV**), 0, Null(bool*));
+    sv_vsetpvfn(sv, pat, strlen(pat), args, NULL, 0, NULL);
     SvSETMAGIC(sv);
 }
 
@@ -7890,7 +7890,7 @@ Usually used via its frontend C<sv_catpvf>.
 void
 Perl_sv_vcatpvf(pTHX_ SV *sv, const char* pat, va_list* args)
 {
-    sv_vcatpvfn(sv, pat, strlen(pat), args, Null(SV**), 0, Null(bool*));
+    sv_vcatpvfn(sv, pat, strlen(pat), args, NULL, 0, NULL);
 }
 
 /*
@@ -7923,7 +7923,7 @@ Usually used via its frontend C<sv_catpvf_mg>.
 void
 Perl_sv_vcatpvf_mg(pTHX_ SV *sv, const char* pat, va_list* args)
 {
-    sv_vcatpvfn(sv, pat, strlen(pat), args, Null(SV**), 0, Null(bool*));
+    sv_vcatpvfn(sv, pat, strlen(pat), args, NULL, 0, NULL);
     SvSETMAGIC(sv);
 }
 
@@ -8131,7 +8131,7 @@ Perl_sv_vcatpvfn(pTHX_ SV *sv, const char *pat, STRLEN patlen, va_list *args, SV
 	const char *eptr = NULL;
 	STRLEN elen = 0;
 	SV *vecsv = NULL;
-	const U8 *vecstr = Null(U8*);
+	const U8 *vecstr = NULL;
 	STRLEN veclen = 0;
 	char c = 0;
 	int i;
@@ -9536,7 +9536,7 @@ Perl_rvpv_dup(pTHX_ SV *dstr, const SV *sstr, CLONE_PARAMS* param)
 	}
     }
     else {
-	/* Copy the Null */
+	/* Copy the NULL */
 	if (SvTYPE(dstr) == SVt_RV)
 	    SvRV_set(dstr, NULL);
 	else
@@ -11068,7 +11068,7 @@ perl_clone_using(PerlInterpreter *proto_perl, UV flags,
     PL_localizing	= proto_perl->Tlocalizing;
 
     PL_errors		= sv_dup_inc(proto_perl->Terrors, param);
-    PL_hv_fetch_ent_mh	= Nullhe;
+    PL_hv_fetch_ent_mh	= NULL;
     PL_modcount		= proto_perl->Tmodcount;
     PL_lastgotoprobe	= NULL;
     PL_dumpindent	= proto_perl->Tdumpindent;
diff --git a/toke.c b/toke.c
index f11ed322cd..1981c75e41 100644
--- a/toke.c
+++ b/toke.c
@@ -820,7 +820,7 @@ S_skipspace(pTHX_ register char *s)
 		PerlIO_clearerr(PL_rsfp);
 	    else
 		(void)PerlIO_close(PL_rsfp);
-	    PL_rsfp = Nullfp;
+	    PL_rsfp = NULL;
 	    return s;
 	}
 
@@ -2781,7 +2781,7 @@ Perl_yylex(pTHX)
 			PerlIO_clearerr(PL_rsfp);
 		    else
 			(void)PerlIO_close(PL_rsfp);
-		    PL_rsfp = Nullfp;
+		    PL_rsfp = NULL;
 		    PL_doextract = FALSE;
 		}
 		if (!PL_in_eval && (PL_minus_n || PL_minus_p)) {
@@ -4610,7 +4610,7 @@ Perl_yylex(pTHX)
 		    }
 		}
 #endif
-		PL_rsfp = Nullfp;
+		PL_rsfp = NULL;
 	    }
 	    goto fake_eof;
 	}
diff --git a/universal.c b/universal.c
index 2afa2f68a1..2eeddb612f 100644
--- a/universal.c
+++ b/universal.c
@@ -342,7 +342,7 @@ XS(XS_UNIVERSAL_VERSION)
         pkg = gv_stashsv(ST(0), FALSE);
     }
 
-    gvp = pkg ? (GV**)hv_fetchs(pkg, "VERSION", FALSE) : Null(GV**);
+    gvp = pkg ? (GV**)hv_fetchs(pkg, "VERSION", FALSE) : NULL;
 
     if (gvp && isGV(gv = *gvp) && (sv = GvSV(gv)) && SvOK(sv)) {
         SV * const nsv = sv_newmortal();
diff --git a/util.c b/util.c
index 61d40365c1..50e0141b7d 100644
--- a/util.c
+++ b/util.c
@@ -1031,7 +1031,7 @@ char *
 Perl_vform(pTHX_ const char *pat, va_list *args)
 {
     SV * const sv = mess_alloc();
-    sv_vsetpvfn(sv, pat, strlen(pat), args, Null(SV**), 0, Null(bool*));
+    sv_vsetpvfn(sv, pat, strlen(pat), args, NULL, 0, NULL);
     return SvPVX(sv);
 }
 
@@ -2123,7 +2123,7 @@ Perl_my_popen_list(pTHX_ char *mode, int n, SV **args)
 	taint_proper("Insecure %s%s", "EXEC");
     }
     if (PerlProc_pipe(p) < 0)
-	return Nullfp;
+	return NULL;
     /* Try for another pipe pair for error return */
     if (PerlProc_pipe(pp) >= 0)
 	did_pipes = 1;
@@ -2135,7 +2135,7 @@ Perl_my_popen_list(pTHX_ char *mode, int n, SV **args)
 		PerlLIO_close(pp[0]);
 		PerlLIO_close(pp[1]);
 	    }
-	    return Nullfp;
+	    return NULL;
 	}
 	sleep(5);
     }
@@ -2224,7 +2224,7 @@ Perl_my_popen_list(pTHX_ char *mode, int n, SV **args)
 		pid2 = wait4pid(pid, &status, 0);
 	    } while (pid2 == -1 && errno == EINTR);
 	    errno = errkid;		/* Propagate errno from kid */
-	    return Nullfp;
+	    return NULL;
 	}
     }
     if (did_pipes)
@@ -2263,7 +2263,7 @@ Perl_my_popen(pTHX_ const char *cmd, const char *mode)
 	taint_proper("Insecure %s%s", "EXEC");
     }
     if (PerlProc_pipe(p) < 0)
-	return Nullfp;
+	return NULL;
     if (doexec && PerlProc_pipe(pp) >= 0)
 	did_pipes = 1;
     while ((pid = PerlProc_fork()) < 0) {
@@ -2276,7 +2276,7 @@ Perl_my_popen(pTHX_ const char *cmd, const char *mode)
 	    }
 	    if (!doexec)
 		Perl_croak(aTHX_ "Can't fork");
-	    return Nullfp;
+	    return NULL;
 	}
 	sleep(5);
     }
@@ -2332,7 +2332,7 @@ Perl_my_popen(pTHX_ const char *cmd, const char *mode)
 #ifdef PERL_USES_PL_PIDSTATUS
 	hv_clear(PL_pidstatus);	/* we have no children */
 #endif
-	return Nullfp;
+	return NULL;
 #undef THIS
 #undef THAT
     }
@@ -2376,7 +2376,7 @@ Perl_my_popen(pTHX_ const char *cmd, const char *mode)
 		pid2 = wait4pid(pid, &status, 0);
 	    } while (pid2 == -1 && errno == EINTR);
 	    errno = errkid;		/* Propagate errno from kid */
-	    return Nullfp;
+	    return NULL;
 	}
     }
     if (did_pipes)
@@ -2782,7 +2782,7 @@ Perl_wait4pid(pTHX_ Pid_t pid, int *statusp, int flags)
     goto finish;
 #endif
 #if !defined(HAS_WAITPID) && defined(HAS_WAIT4)
-    result = wait4((pid==-1)?0:pid,statusp,flags,Null(struct rusage *));
+    result = wait4((pid==-1)?0:pid,statusp,flags,NULL);
     goto finish;
 #endif
 #ifdef PERL_USES_PL_PIDSTATUS
@@ -3341,7 +3341,7 @@ Perl_get_vtbl(pTHX_ int vtbl_id)
 	result = &PL_vtbl_utf8;
 	break;
     default:
-	result = Null(MGVTBL*);
+	result = NULL;
 	break;
     }
     return (MGVTBL*)result;