X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/405b39414254316617f9eff6eba0472cb6c4cb70..a9c883f63197ffe78a9fa90fb454b99d9d4027c2:/perlio.c

diff --git a/perlio.c b/perlio.c
index c8047f8..50e3be1 100644
--- a/perlio.c
+++ b/perlio.c
@@ -93,12 +93,52 @@ PerlIO_apply_layers(pTHX_ PerlIO *f, const char *mode, const char *names)
  return -1;
 }
 
+void
+PerlIO_destruct(pTHX)
+{
+}
+
 int
 PerlIO_binmode(pTHX_ PerlIO *fp, int iotype, int mode, const char *names)
 {
  return perlsio_binmode(fp,iotype,mode);
 }
 
+/* De-mux PerlIO_openn() into fdopen, freopen and fopen type entries */
+
+PerlIO *
+PerlIO_openn(pTHX_ const char *layers, const char *mode, int fd, int imode, int perm, PerlIO *old, int narg, SV **args)
+{
+ if (narg == 1)
+  {
+   if (*args == &PL_sv_undef)
+    return PerlIO_tmpfile();
+   else
+    {
+     char *name = SvPV_nolen(*args);
+     if (*mode == '#')
+      {
+       fd = PerlLIO_open3(name,imode,perm);
+       if (fd >= 0)
+        return PerlIO_fdopen(fd,mode+1);
+      }
+     else if (old)
+      {
+       return PerlIO_reopen(name,mode,old);
+      }
+     else
+      {
+       return PerlIO_open(name,mode);
+      }
+    }
+  }
+ else
+  {
+   return PerlIO_fdopen(fd,mode);
+  }
+ return NULL;
+}
+
 #endif
 
 
@@ -216,6 +256,8 @@ PerlIO_debug(const char *fmt,...)
 PerlIO *_perlio      = NULL;
 #define PERLIO_TABLE_SIZE 64
 
+
+
 PerlIO *
 PerlIO_allocate(pTHX)
 {
@@ -276,9 +318,39 @@ PerlIO_cleanup()
 }
 
 void
-PerlIO_pop(PerlIO *f)
+PerlIO_destruct(pTHX)
+{
+ PerlIO **table = &_perlio;
+ PerlIO *f;
+ while ((f = *table))
+  {
+   int i;
+   table = (PerlIO **)(f++);
+   for (i=1; i < PERLIO_TABLE_SIZE; i++)
+    {
+     PerlIO *x = f;
+     PerlIOl *l;
+     while ((l = *x))
+      {
+       if (l->tab->kind & PERLIO_K_DESTRUCT)
+        {
+         PerlIO_debug("Destruct popping %s\n",l->tab->name);
+         PerlIO_flush(x);
+         PerlIO_pop(aTHX_ x);
+        }
+       else
+        {
+         x = PerlIONext(x);
+        }
+      }
+     f++;
+    }
+  }
+}
+
+void
+PerlIO_pop(pTHX_ PerlIO *f)
 {
- dTHX;
  PerlIOl *l = *f;
  if (l)
   {
@@ -314,16 +386,29 @@ XS(XS_perlio_unimport)
 }
 
 SV *
-PerlIO_find_layer(const char *name, STRLEN len)
+PerlIO_find_layer(pTHX_ const char *name, STRLEN len)
 {
- dTHX;
  SV **svp;
  SV *sv;
  if ((SSize_t) len <= 0)
   len = strlen(name);
  svp  = hv_fetch(PerlIO_layer_hv,name,len,0);
- if (svp && (sv = *svp) && SvROK(sv))
-  return *svp;
+ if (!svp && PL_subname && PerlIO_layer_av && av_len(PerlIO_layer_av)+1 >= 2)
+  {
+   SV *pkgsv  = newSVpvn("PerlIO",6);
+   SV *layer  = newSVpvn(name,len);
+   ENTER;
+   /* The two SVs are magically freed by load_module */
+   Perl_load_module(aTHX_ 0, pkgsv, Nullsv, layer, Nullsv);
+   LEAVE;
+   /* Say this is lvalue so we get an 'undef' if still not there */
+   svp  = hv_fetch(PerlIO_layer_hv,name,len,1);
+  }
+ if (svp && (sv = *svp))
+  {
+   if (SvROK(sv))
+    return *svp;
+  }
  return NULL;
 }
 
@@ -396,7 +481,7 @@ XS(XS_io_MODIFY_SCALAR_ATTRIBUTES)
   {
    STRLEN len;
    const char *name = SvPV(ST(i),len);
-   SV *layer  = PerlIO_find_layer(name,len);
+   SV *layer  = PerlIO_find_layer(aTHX_ name,len);
    if (layer)
     {
      av_push(av,SvREFCNT_inc(layer));
@@ -411,22 +496,110 @@ XS(XS_io_MODIFY_SCALAR_ATTRIBUTES)
  XSRETURN(count);
 }
 
-void
-PerlIO_define_layer(PerlIO_funcs *tab)
+SV *
+PerlIO_tab_sv(pTHX_ PerlIO_funcs *tab)
 {
- dTHX;
  HV *stash = gv_stashpv("perlio::Layer", TRUE);
  SV *sv = sv_bless(newRV_noinc(newSViv(PTR2IV(tab))),stash);
+ return sv;
+}
+
+void
+PerlIO_define_layer(pTHX_ PerlIO_funcs *tab)
+{
  if (!PerlIO_layer_hv)
   {
    PerlIO_layer_hv = get_hv("open::layers",GV_ADD|GV_ADDMULTI);
   }
- hv_store(PerlIO_layer_hv,tab->name,strlen(tab->name),sv,0);
+ hv_store(PerlIO_layer_hv,tab->name,strlen(tab->name),PerlIO_tab_sv(aTHX_ tab),0);
  PerlIO_debug("define %s %p\n",tab->name,tab);
 }
 
+int
+PerlIO_parse_layers(pTHX_ AV *av, const char *names)
+{
+ if (names)
+  {
+   const char *s = names;
+   while (*s)
+    {
+     while (isSPACE(*s) || *s == ':')
+      s++;
+     if (*s)
+      {
+       STRLEN llen = 0;
+       const char *e = s;
+       const char *as = Nullch;
+       STRLEN alen = 0;
+       if (!isIDFIRST(*s))
+        {
+         /* Message is consistent with how attribute lists are passed.
+            Even though this means "foo : : bar" is seen as an invalid separator
+            character.  */
+         char q = ((*s == '\'') ? '"' : '\'');
+         Perl_warn(aTHX_ "perlio: invalid separator character %c%c%c in layer specification list", q, *s, q);
+         return -1;
+        }
+       do
+        {
+         e++;
+        } while (isALNUM(*e));
+       llen = e-s;
+       if (*e == '(')
+        {
+         int nesting = 1;
+         as = ++e;
+         while (nesting)
+          {
+           switch (*e++)
+            {
+             case ')':
+              if (--nesting == 0)
+               alen = (e-1)-as;
+              break;
+             case '(':
+              ++nesting;
+              break;
+             case '\\':
+              /* It's a nul terminated string, not allowed to \ the terminating null.
+                 Anything other character is passed over.  */
+              if (*e++)
+               {
+                break;
+               }
+              /* Drop through */
+             case '\0':
+              e--;
+              Perl_warn(aTHX_ "perlio: argument list not closed for layer \"%.*s\"",(int)(e - s),s);
+              return -1;
+             default:
+              /* boring.  */
+              break;
+            }
+          }
+        }
+       if (e > s)
+        {
+         SV *layer = PerlIO_find_layer(aTHX_ s,llen);
+         if (layer)
+          {
+           av_push(av,SvREFCNT_inc(layer));
+           av_push(av,(as) ? newSVpvn(as,alen) : &PL_sv_undef);
+          }
+         else {
+          Perl_warn(aTHX_ "perlio: unknown layer \"%.*s\"",(int)llen,s);
+	  return -1;
+	 }
+        }
+       s = e;
+      }
+    }
+  }
+ return 0;
+}
+
 void
-PerlIO_default_buffer(pTHX)
+PerlIO_default_buffer(pTHX_ AV *av)
 {
  PerlIO_funcs *tab = &PerlIO_perlio;
  if (O_BINARY != O_TEXT)
@@ -441,99 +614,94 @@ PerlIO_default_buffer(pTHX)
     }
   }
  PerlIO_debug("Pushing %s\n",tab->name);
- av_push(PerlIO_layer_av,SvREFCNT_inc(PerlIO_find_layer(tab->name,0)));
+ av_push(av,SvREFCNT_inc(PerlIO_find_layer(aTHX_ tab->name,0)));
+ av_push(av,&PL_sv_undef);
 }
 
+SV *
+PerlIO_arg_fetch(pTHX_ AV *av,IV n)
+{
+ SV **svp = av_fetch(av,n,FALSE);
+ return (svp) ? *svp : Nullsv;
+}
 
 PerlIO_funcs *
-PerlIO_default_layer(I32 n)
+PerlIO_layer_fetch(pTHX_ AV *av,IV n,PerlIO_funcs *def)
 {
- dTHX;
- SV **svp;
+ SV **svp = av_fetch(av,n,FALSE);
  SV *layer;
- PerlIO_funcs *tab = &PerlIO_stdio;
- int len;
+ if (svp && (layer = *svp) && SvROK(layer) && SvIOK((layer = SvRV(layer))))
+  {
+   /* PerlIO_debug("Layer %d is %s\n",n/2,tab->name); */
+   return INT2PTR(PerlIO_funcs *, SvIV(layer));
+  }
+ if (!def)
+  Perl_croak(aTHX_ "panic:PerlIO layer array corrupt");
+ return def;
+}
+
+AV *
+PerlIO_default_layers(pTHX)
+{
+ IV len;
  if (!PerlIO_layer_av)
   {
-   const char *s  = PerlEnv_getenv("PERLIO");
+   const char *s  = (PL_tainting) ? Nullch : PerlEnv_getenv("PERLIO");
    PerlIO_layer_av = get_av("open::layers",GV_ADD|GV_ADDMULTI);
    newXS("perlio::import",XS_perlio_import,__FILE__);
    newXS("perlio::unimport",XS_perlio_unimport,__FILE__);
 #if 0
    newXS("io::MODIFY_SCALAR_ATTRIBUTES",XS_io_MODIFY_SCALAR_ATTRIBUTES,__FILE__);
 #endif
-   PerlIO_define_layer(&PerlIO_raw);
-   PerlIO_define_layer(&PerlIO_unix);
-   PerlIO_define_layer(&PerlIO_perlio);
-   PerlIO_define_layer(&PerlIO_stdio);
-   PerlIO_define_layer(&PerlIO_crlf);
+   PerlIO_define_layer(aTHX_ &PerlIO_raw);
+   PerlIO_define_layer(aTHX_ &PerlIO_unix);
+   PerlIO_define_layer(aTHX_ &PerlIO_perlio);
+   PerlIO_define_layer(aTHX_ &PerlIO_stdio);
+   PerlIO_define_layer(aTHX_ &PerlIO_crlf);
 #ifdef HAS_MMAP
-   PerlIO_define_layer(&PerlIO_mmap);
+   PerlIO_define_layer(aTHX_ &PerlIO_mmap);
 #endif
-   PerlIO_define_layer(&PerlIO_utf8);
-   PerlIO_define_layer(&PerlIO_byte);
-   av_push(PerlIO_layer_av,SvREFCNT_inc(PerlIO_find_layer(PerlIO_unix.name,0)));
+   PerlIO_define_layer(aTHX_ &PerlIO_utf8);
+   PerlIO_define_layer(aTHX_ &PerlIO_byte);
+   av_push(PerlIO_layer_av,SvREFCNT_inc(PerlIO_find_layer(aTHX_ PerlIO_unix.name,0)));
+   av_push(PerlIO_layer_av,&PL_sv_undef);
    if (s)
     {
-     IV buffered = 0;
-     while (*s)
-      {
-       while (*s && isSPACE((unsigned char)*s))
-        s++;
-       if (*s)
-        {
-         const char *e = s;
-         SV *layer;
-         while (*e && !isSPACE((unsigned char)*e))
-          e++;
-         if (*s == ':')
-          s++;
-         layer = PerlIO_find_layer(s,e-s);
-         if (layer)
-          {
-           PerlIO_funcs *tab = INT2PTR(PerlIO_funcs *, SvIV(SvRV(layer)));
-           if ((tab->kind & PERLIO_K_DUMMY) && (tab->kind & PERLIO_K_BUFFERED))
-            {
-             if (!buffered)
-              PerlIO_default_buffer(aTHX);
-            }
-           PerlIO_debug("Pushing %.*s\n",(e-s),s);
-           av_push(PerlIO_layer_av,SvREFCNT_inc(layer));
-           buffered |= (tab->kind & PERLIO_K_BUFFERED);
-          }
-         else
-          Perl_warn(aTHX_ "perlio: unknown layer \"%.*s\"",(e-s),s);
-         s = e;
-        }
-      }
+     PerlIO_parse_layers(aTHX_ PerlIO_layer_av,s);
+    }
+   else
+    {
+     PerlIO_default_buffer(aTHX_ PerlIO_layer_av);
     }
   }
- len  = av_len(PerlIO_layer_av);
- if (len < 1)
+ len  = av_len(PerlIO_layer_av)+1;
+ if (len < 2)
   {
-   PerlIO_default_buffer(aTHX);
+   PerlIO_default_buffer(aTHX_ PerlIO_layer_av);
    len  = av_len(PerlIO_layer_av);
   }
+ return PerlIO_layer_av;
+}
+
+
+PerlIO_funcs *
+PerlIO_default_layer(pTHX_ I32 n)
+{
+ AV *av = PerlIO_default_layers(aTHX);
+ n *= 2;
  if (n < 0)
-  n += len+1;
- svp = av_fetch(PerlIO_layer_av,n,0);
- if (svp && (layer = *svp) && SvROK(layer) && SvIOK((layer = SvRV(layer))))
-  {
-   tab = INT2PTR(PerlIO_funcs *, SvIV(layer));
-  }
- /* PerlIO_debug("Layer %d is %s\n",n,tab->name); */
- return tab;
+  n += av_len(PerlIO_layer_av)+1;
+ return PerlIO_layer_fetch(aTHX_ av,n, &PerlIO_stdio);
 }
 
-#define PerlIO_default_top() PerlIO_default_layer(-1)
-#define PerlIO_default_btm() PerlIO_default_layer(0)
+#define PerlIO_default_top() PerlIO_default_layer(aTHX_ -1)
+#define PerlIO_default_btm() PerlIO_default_layer(aTHX_ 0)
 
 void
-PerlIO_stdstreams()
+PerlIO_stdstreams(pTHX)
 {
  if (!_perlio)
   {
-   dTHX;
    PerlIO_allocate(aTHX);
    PerlIO_fdopen(0,"Ir" PERLIO_STDTEXT);
    PerlIO_fdopen(1,"Iw" PERLIO_STDTEXT);
@@ -542,9 +710,8 @@ PerlIO_stdstreams()
 }
 
 PerlIO *
-PerlIO_push(PerlIO *f,PerlIO_funcs *tab,const char *mode,const char *arg,STRLEN len)
+PerlIO_push(pTHX_ PerlIO *f,PerlIO_funcs *tab,const char *mode,SV *arg)
 {
- dTHX;
  PerlIOl *l = NULL;
  l = PerlMemShared_calloc(tab->size,sizeof(char));
  if (l)
@@ -553,11 +720,11 @@ PerlIO_push(PerlIO *f,PerlIO_funcs *tab,const char *mode,const char *arg,STRLEN
    l->next = *f;
    l->tab  = tab;
    *f      = l;
-   PerlIO_debug("PerlIO_push f=%p %s %s '%.*s'\n",
-                 f,tab->name,(mode) ? mode : "(Null)",(int) len,arg);
-   if ((*l->tab->Pushed)(f,mode,arg,len) != 0)
+   PerlIO_debug("PerlIO_push f=%p %s %s %p\n",f,tab->name,
+                 (mode) ? mode : "(Null)",arg);
+   if ((*l->tab->Pushed)(f,mode,arg) != 0)
     {
-     PerlIO_pop(f);
+     PerlIO_pop(aTHX_ f);
      return NULL;
     }
   }
@@ -565,23 +732,25 @@ PerlIO_push(PerlIO *f,PerlIO_funcs *tab,const char *mode,const char *arg,STRLEN
 }
 
 IV
-PerlIOPop_pushed(PerlIO *f, const char *mode, const char *arg, STRLEN len)
+PerlIOPop_pushed(PerlIO *f, const char *mode, SV *arg)
 {
- PerlIO_pop(f);
+ dTHX;
+ PerlIO_pop(aTHX_ f);
  if (*f)
   {
    PerlIO_flush(f);
-   PerlIO_pop(f);
+   PerlIO_pop(aTHX_ f);
    return 0;
   }
  return -1;
 }
 
 IV
-PerlIORaw_pushed(PerlIO *f, const char *mode, const char *arg, STRLEN len)
+PerlIORaw_pushed(PerlIO *f, const char *mode, SV *arg)
 {
  /* Remove the dummy layer */
- PerlIO_pop(f);
+ dTHX;
+ PerlIO_pop(aTHX_ f);
  /* Pop back to bottom layer */
  if (f && *f)
   {
@@ -591,14 +760,14 @@ PerlIORaw_pushed(PerlIO *f, const char *mode, const char *arg, STRLEN len)
     {
      if (*PerlIONext(f))
       {
-       PerlIO_pop(f);
+       PerlIO_pop(aTHX_ f);
       }
      else
       {
        /* Nothing bellow - push unix on top then remove it */
-       if (PerlIO_push(f,PerlIO_default_btm(),mode,arg,len))
+       if (PerlIO_push(aTHX_ f,PerlIO_default_btm(),mode,arg))
         {
-         PerlIO_pop(PerlIONext(f));
+         PerlIO_pop(aTHX_ PerlIONext(f));
         }
        break;
       }
@@ -610,92 +779,42 @@ PerlIORaw_pushed(PerlIO *f, const char *mode, const char *arg, STRLEN len)
 }
 
 int
-PerlIO_apply_layers(pTHX_ PerlIO *f, const char *mode, const char *names)
+PerlIO_apply_layera(pTHX_ PerlIO *f, const char *mode, AV *layers, IV n)
 {
- if (names)
+ IV max = av_len(layers)+1;
+ int code = 0;
+ while (n < max)
   {
-   const char *s = names;
-   while (*s)
+   PerlIO_funcs *tab = PerlIO_layer_fetch(aTHX_ layers,n,NULL);
+   if (tab)
     {
-     while (isSPACE(*s) || *s == ':')
-      s++;
-     if (*s)
+     if (!PerlIO_push(aTHX_ f,tab,mode,PerlIOArg))
       {
-       STRLEN llen = 0;
-       const char *e = s;
-       const char *as = Nullch;
-       STRLEN alen = 0;
-       if (!isIDFIRST(*s))
-        {
-         /* Message is consistent with how attribute lists are passed.
-            Even though this means "foo : : bar" is seen as an invalid separator
-            character.  */
-         char q = ((*s == '\'') ? '"' : '\'');
-         Perl_warn(aTHX_ "perlio: invalid separator character %c%c%c in layer specification list", q, *s, q);
-         return -1;
-        }
-       do
-        {
-         e++;
-        } while (isALNUM(*e));
-       llen = e-s;
-       if (*e == '(')
-        {
-         int nesting = 1;
-         as = ++e;
-         while (nesting)
-          {
-           switch (*e++)
-            {
-             case ')':
-              if (--nesting == 0)
-               alen = (e-1)-as;
-              break;
-             case '(':
-              ++nesting;
-              break;
-             case '\\':
-              /* It's a nul terminated string, not allowed to \ the terminating null.
-                 Anything other character is passed over.  */
-              if (*e++)
-               {
-                break;
-               }
-              /* Drop through */
-             case '\0':
-              e--;
-              Perl_warn(aTHX_ "perlio: argument list not closed for layer \"%.*s\"",(int)(e - s),s);
-              return -1;
-             default:
-              /* boring.  */
-              break;
-            }
-          }
-        }
-       if (e > s)
-        {
-         SV *layer = PerlIO_find_layer(s,llen);
-         if (layer)
-          {
-           PerlIO_funcs *tab = INT2PTR(PerlIO_funcs *, SvIV(SvRV(layer)));
-           if (tab)
-            {
-             if (!PerlIO_push(f,tab,mode,as,alen))
-              return -1;
-            }
-          }
-         else {
-          Perl_warn(aTHX_ "perlio: unknown layer \"%.*s\"",(int)llen,s);
-	  return -1;
-	 }
-        }
-       s = e;
+       code = -1;
+       break;
       }
     }
+   n += 2;
   }
- return 0;
+ return code;
 }
 
+int
+PerlIO_apply_layers(pTHX_ PerlIO *f, const char *mode, const char *names)
+{
+ int code = 0;
+ if (names)
+  {
+   AV *layers = newAV();
+   code = PerlIO_parse_layers(aTHX_ layers,names);
+   if (code == 0)
+    {
+     code = PerlIO_apply_layera(aTHX_ f, mode, layers, 0);
+    }
+   SvREFCNT_dec((SV *) layers);
+  }
+ return code;
+}
 
 
 /*--------------------------------------------------------------------------------------*/
@@ -750,10 +869,15 @@ PerlIO_fdupopen(pTHX_ PerlIO *f)
 int
 PerlIO_close(PerlIO *f)
 {
- int code = (*PerlIOBase(f)->tab->Close)(f);
- while (*f)
+ dTHX;
+ int code = -1;
+ if (f && *f)
   {
-   PerlIO_pop(f);
+   code = (*PerlIOBase(f)->tab->Close)(f);
+   while (*f)
+    {
+     PerlIO_pop(aTHX_ f);
+    }
   }
  return code;
 }
@@ -765,44 +889,183 @@ PerlIO_fileno(PerlIO *f)
  return (*PerlIOBase(f)->tab->Fileno)(f);
 }
 
+static const char *
+PerlIO_context_layers(pTHX_ const char *mode)
+{
+ const char *type = NULL;
+ /* Need to supply default layer info from open.pm */
+ if (PL_curcop)
+  {
+   SV *layers = PL_curcop->cop_io;
+   if (layers)
+    {
+     STRLEN len;
+     type = SvPV(layers,len);
+     if (type && mode[0] != 'r')
+      {
+       /* Skip to write part */
+       const char *s = strchr(type,0);
+       if (s && (s-type) < len)
+        {
+         type = s+1;
+        }
+      }
+    }
+  }
+ return type;
+}
+
+AV *
+PerlIO_resolve_layers(pTHX_ const char *layers,const char *mode,int narg, SV **args)
+{
+ AV *def = PerlIO_default_layers(aTHX);
+ int incdef = 1;
+ if (!_perlio)
+  PerlIO_stdstreams(aTHX);
+ if (narg)
+  {
+   if (SvROK(*args) && !sv_isobject(*args))
+    {
+     if (SvTYPE(SvRV(*args)) < SVt_PVAV)
+      {
+       SV *handler = PerlIO_find_layer(aTHX_ "Scalar",6);
+       if (handler)
+        {
+         def    = newAV();
+         av_push(def,handler);
+         av_push(def,&PL_sv_undef);
+         incdef = 0;
+        }
+      }
+     else
+      {
+       Perl_croak(aTHX_ "Unsupported reference arg to open()");
+      }
+    }
+  }
+ if (!layers)
+  layers = PerlIO_context_layers(aTHX_ mode);
+ if (layers && *layers)
+  {
+   AV *av;
+   if (incdef)
+    {
+     IV n = av_len(def)+1;
+     av = newAV();
+     while (n-- > 0)
+      {
+       SV **svp = av_fetch(def,n,0);
+       av_store(av,n,(svp) ? SvREFCNT_inc(*svp) : &PL_sv_undef);
+      }
+    }
+   else
+    {
+     av = def;
+    }
+   PerlIO_parse_layers(aTHX_ av,layers);
+   return av;
+  }
+ else
+  {
+   if (incdef)
+    SvREFCNT_inc(def);
+   return def;
+  }
+}
+
+PerlIO *
+PerlIO_openn(pTHX_ const char *layers, const char *mode, int fd, int imode, int perm, PerlIO *f, int narg, SV **args)
+{
+ if (!f && narg == 1 && *args == &PL_sv_undef)
+  {
+   if ((f = PerlIO_tmpfile()))
+    {
+     if (!layers)
+      layers = PerlIO_context_layers(aTHX_ mode);
+     if (layers && *layers)
+      PerlIO_apply_layers(aTHX_ f,mode,layers);
+    }
+  }
+ else
+  {
+   AV *layera;
+   IV n;
+   PerlIO_funcs *tab;
+   if (f && *f)
+    {
+     /* This is "reopen" - it is not tested as perl does not use it yet */
+     PerlIOl *l = *f;
+     layera = newAV();
+     while (l)
+      {
+       SV *arg = (l->tab->Getarg) ? (*l->tab->Getarg)(&l) : &PL_sv_undef;
+       av_unshift(layera,2);
+       av_store(layera,0,PerlIO_tab_sv(aTHX_ l->tab));
+       av_store(layera,1,arg);
+       l = *PerlIONext(&l);
+      }
+    }
+   else
+    {
+     layera = PerlIO_resolve_layers(aTHX_ layers, mode, narg, args);
+    }
+   n = av_len(layera)-1;
+   while (n >= 0)
+    {
+     PerlIO_funcs *t = PerlIO_layer_fetch(aTHX_ layera,n,NULL);
+     if (t && t->Open)
+      {
+       tab = t;
+       break;
+      }
+     n -= 2;
+    }
+   if (tab)
+    {
+     PerlIO_debug("openn(%s,'%s','%s',%d,%x,%o,%p,%d,%p)\n",
+                  tab->name,layers,mode,fd,imode,perm,f,narg,args);
+     f = (*tab->Open)(aTHX_ tab, layera, n, mode,fd,imode,perm,f,narg,args);
+     if (f)
+      {
+       if (n+2 < av_len(layera)+1)
+        {
+         if (PerlIO_apply_layera(aTHX_ f, mode, layera, n+2) != 0)
+          {
+           f = NULL;
+          }
+        }
+      }
+    }
+   SvREFCNT_dec(layera);
+  }
+ return f;
+}
 
 
 #undef PerlIO_fdopen
 PerlIO *
 PerlIO_fdopen(int fd, const char *mode)
 {
- PerlIO_funcs *tab = PerlIO_default_top();
- if (!_perlio)
-  PerlIO_stdstreams();
- return (*tab->Fdopen)(tab,fd,mode);
+ dTHX;
+ return PerlIO_openn(aTHX_ Nullch,mode,fd,0,0,NULL,0,NULL);
 }
 
 #undef PerlIO_open
 PerlIO *
 PerlIO_open(const char *path, const char *mode)
 {
- PerlIO_funcs *tab = PerlIO_default_top();
- if (!_perlio)
-  PerlIO_stdstreams();
- return (*tab->Open)(tab,path,mode);
+ dTHX;
+ SV *name = sv_2mortal(newSVpvn(path,strlen(path)));
+ return PerlIO_openn(aTHX_ Nullch,mode,-1,0,0,NULL,1,&name);
 }
 
 #undef PerlIO_reopen
 PerlIO *
 PerlIO_reopen(const char *path, const char *mode, PerlIO *f)
 {
- if (f)
-  {
-   PerlIO_flush(f);
-   if ((*PerlIOBase(f)->tab->Reopen)(path,mode,f) == 0)
-    {
-     if ((*PerlIOBase(f)->tab->Pushed)(f,mode,Nullch,0) == 0)
-      return f;
-    }
-   return NULL;
-  }
- else
-  return PerlIO_open(path,mode);
+ dTHX;
+ SV *name = sv_2mortal(newSVpvn(path,strlen(path)));
+ return PerlIO_openn(aTHX_ Nullch,mode,-1,0,0,f,1,&name);
 }
 
 #undef PerlIO_read
@@ -877,6 +1140,25 @@ PerlIO_flush(PerlIO *f)
   }
 }
 
+void
+PerlIOBase_flush_linebuf()
+{
+ PerlIO **table = &_perlio;
+ PerlIO *f;
+ while ((f = *table))
+  {
+   int i;
+   table = (PerlIO **)(f++);
+   for (i=1; i < PERLIO_TABLE_SIZE; i++)
+    {
+     if (*f && (PerlIOBase(f)->flags & (PERLIO_F_LINEBUF|PERLIO_F_CANWRITE))
+                == (PERLIO_F_LINEBUF|PERLIO_F_CANWRITE))
+      PerlIO_flush(f);
+     f++;
+    }
+  }
+}
+
 #undef PerlIO_fill
 int
 PerlIO_fill(PerlIO *f)
@@ -1025,12 +1307,13 @@ PerlIO_set_ptrcnt(PerlIO *f, STDCHAR *ptr, int cnt)
 /* utf8 and raw dummy layers */
 
 IV
-PerlIOUtf8_pushed(PerlIO *f, const char *mode, const char *arg, STRLEN len)
+PerlIOUtf8_pushed(PerlIO *f, const char *mode, SV *arg)
 {
  if (PerlIONext(f))
   {
+   dTHX;
    PerlIO_funcs *tab = PerlIOBase(f)->tab;
-   PerlIO_pop(f);
+   PerlIO_pop(aTHX_ f);
    if (tab->kind & PERLIO_K_UTF8)
     PerlIOBase(f)->flags |= PERLIO_F_UTF8;
    else
@@ -1040,47 +1323,14 @@ PerlIOUtf8_pushed(PerlIO *f, const char *mode, const char *arg, STRLEN len)
  return -1;
 }
 
-PerlIO *
-PerlIOUtf8_fdopen(PerlIO_funcs *self, int fd,const char *mode)
-{
- PerlIO_funcs *tab = PerlIO_default_layer(-2);
- PerlIO *f = (*tab->Fdopen)(tab,fd,mode);
- if (f)
-  {
-   PerlIOl *l = PerlIOBase(f);
-   if (tab->kind & PERLIO_K_UTF8)
-    l->flags |= PERLIO_F_UTF8;
-   else
-    l->flags &= ~PERLIO_F_UTF8;
- }
- return f;
-}
-
-PerlIO *
-PerlIOUtf8_open(PerlIO_funcs *self, const char *path,const char *mode)
-{
- PerlIO_funcs *tab = PerlIO_default_layer(-2);
- PerlIO *f = (*tab->Open)(tab,path,mode);
- if (f)
-  {
-   PerlIOl *l = PerlIOBase(f);
-   if (tab->kind & PERLIO_K_UTF8)
-    l->flags |= PERLIO_F_UTF8;
-   else
-    l->flags &= ~PERLIO_F_UTF8;
-  }
- return f;
-}
-
 PerlIO_funcs PerlIO_utf8 = {
  "utf8",
  sizeof(PerlIOl),
  PERLIO_K_DUMMY|PERLIO_F_UTF8,
+ PerlIOUtf8_pushed,
+ NULL,
  NULL,
- PerlIOUtf8_fdopen,
- PerlIOUtf8_open,
  NULL,
- PerlIOUtf8_pushed,
  NULL,
  NULL,
  NULL,
@@ -1105,11 +1355,10 @@ PerlIO_funcs PerlIO_byte = {
  "bytes",
  sizeof(PerlIOl),
  PERLIO_K_DUMMY,
+ PerlIOUtf8_pushed,
+ NULL,
  NULL,
- PerlIOUtf8_fdopen,
- PerlIOUtf8_open,
  NULL,
- PerlIOUtf8_pushed,
  NULL,
  NULL,
  NULL,
@@ -1131,29 +1380,21 @@ PerlIO_funcs PerlIO_byte = {
 };
 
 PerlIO *
-PerlIORaw_fdopen(PerlIO_funcs *self, int fd,const char *mode)
+PerlIORaw_open(pTHX_ PerlIO_funcs *self,  AV *layers, IV n,const char *mode, int fd, int imode, int perm, PerlIO *old, int narg, SV **args)
 {
  PerlIO_funcs *tab = PerlIO_default_btm();
- return (*tab->Fdopen)(tab,fd,mode);
-}
-
-PerlIO *
-PerlIORaw_open(PerlIO_funcs *self, const char *path,const char *mode)
-{
- PerlIO_funcs *tab = PerlIO_default_btm();
- return (*tab->Open)(tab,path,mode);
+ return (*tab->Open)(aTHX_ tab,layers,n-2,mode,fd,imode,perm,old,narg,args);
 }
 
 PerlIO_funcs PerlIO_raw = {
  "raw",
  sizeof(PerlIOl),
  PERLIO_K_DUMMY,
- NULL,
- PerlIORaw_fdopen,
- PerlIORaw_open,
- NULL,
  PerlIORaw_pushed,
  PerlIOBase_popped,
+ PerlIORaw_open,
+ NULL,
+ NULL,
  NULL,
  NULL,
  NULL,
@@ -1218,7 +1459,7 @@ PerlIO_modestr(PerlIO *f,char *buf)
 }
 
 IV
-PerlIOBase_pushed(PerlIO *f, const char *mode, const char *arg, STRLEN len)
+PerlIOBase_pushed(PerlIO *f, const char *mode, SV *arg)
 {
  PerlIOl *l = PerlIOBase(f);
  const char *omode = mode;
@@ -1289,14 +1530,46 @@ PerlIOBase_popped(PerlIO *f)
 SSize_t
 PerlIOBase_unread(PerlIO *f, const void *vbuf, Size_t count)
 {
+ dTHX;
  Off_t old = PerlIO_tell(f);
  SSize_t done;
- PerlIO_push(f,&PerlIO_pending,"r",Nullch,0);
+ PerlIO_push(aTHX_ f,&PerlIO_pending,"r",Nullsv);
  done = PerlIOBuf_unread(f,vbuf,count);
  PerlIOSelf(f,PerlIOBuf)->posn = old - done;
  return done;
 }
 
+SSize_t
+PerlIOBase_read(PerlIO *f, void *vbuf, Size_t count)
+{
+ STDCHAR *buf  = (STDCHAR *) vbuf;
+ if (f)
+  {
+   if (!(PerlIOBase(f)->flags & PERLIO_F_CANREAD))
+    return 0;
+   while (count > 0)
+    {
+     SSize_t avail = PerlIO_get_cnt(f);
+     SSize_t take  = (count < avail) ? count : avail;
+     if (take > 0)
+      {
+       STDCHAR *ptr = PerlIO_get_ptr(f);
+       Copy(ptr,buf,take,STDCHAR);
+       PerlIO_set_ptrcnt(f,ptr+take,(avail -= take));
+       count   -= take;
+       buf     += take;
+      }
+     if (count > 0  && avail <= 0)
+      {
+       if (PerlIO_fill(f) != 0)
+        break;
+      }
+    }
+   return (buf - (STDCHAR *) vbuf);
+  }
+ return 0;
+}
+
 IV
 PerlIOBase_noop_ok(PerlIO *f)
 {
@@ -1316,7 +1589,7 @@ PerlIOBase_close(PerlIO *f)
  PerlIO *n = PerlIONext(f);
  if (PerlIO_flush(f) != 0)
   code = -1;
- if (n && (*PerlIOBase(n)->tab->Close)(n) != 0)
+ if (n && *n && (*PerlIOBase(n)->tab->Close)(n) != 0)
   code = -1;
  PerlIOBase(f)->flags &= ~(PERLIO_F_CANREAD|PERLIO_F_CANWRITE|PERLIO_F_OPEN);
  return code;
@@ -1357,7 +1630,10 @@ PerlIOBase_clearerr(PerlIO *f)
 void
 PerlIOBase_setlinebuf(PerlIO *f)
 {
-
+ if (f)
+  {
+   PerlIOBase(f)->flags |= PERLIO_F_LINEBUF;
+  }
 }
 
 /*--------------------------------------------------------------------------------------*/
@@ -1436,9 +1712,9 @@ PerlIOUnix_fileno(PerlIO *f)
 }
 
 IV
-PerlIOUnix_pushed(PerlIO *f, const char *mode, const char *arg, STRLEN len)
+PerlIOUnix_pushed(PerlIO *f, const char *mode, SV *arg)
 {
- IV code = PerlIOBase_pushed(f,mode,arg,len);
+ IV code = PerlIOBase_pushed(f,mode,arg);
  if (*PerlIONext(f))
   {
    PerlIOUnix *s = PerlIOSelf(f,PerlIOUnix);
@@ -1450,65 +1726,53 @@ PerlIOUnix_pushed(PerlIO *f, const char *mode, const char *arg, STRLEN len)
 }
 
 PerlIO *
-PerlIOUnix_fdopen(PerlIO_funcs *self, int fd,const char *mode)
+PerlIOUnix_open(pTHX_ PerlIO_funcs *self, AV *layers, IV n, const char *mode, int fd, int imode, int perm, PerlIO *f, int narg, SV **args)
 {
- dTHX;
- PerlIO *f = NULL;
- if (*mode == 'I')
-  mode++;
- if (fd >= 0)
+ if (f)
+  {
+   if (PerlIOBase(f)->flags & PERLIO_F_OPEN)
+    (*PerlIOBase(f)->tab->Close)(f);
+  }
+ if (narg > 0)
   {
-   int oflags = PerlIOUnix_oflags(mode);
-   if (oflags != -1)
+   char *path = SvPV_nolen(*args);
+   if (*mode == '#')
+    mode++;
+   else
+    {
+     imode = PerlIOUnix_oflags(mode);
+     perm  = 0666;
+    }
+   if (imode != -1)
     {
-     PerlIOUnix *s = PerlIOSelf(PerlIO_push(f = PerlIO_allocate(aTHX),self,mode,Nullch,0),PerlIOUnix);
-     s->fd     = fd;
-     s->oflags = oflags;
+     fd = PerlLIO_open3(path,imode,perm);
     }
   }
- return f;
-}
-
-PerlIO *
-PerlIOUnix_open(PerlIO_funcs *self, const char *path,const char *mode)
-{
- dTHX;
- PerlIO *f = NULL;
- int oflags = PerlIOUnix_oflags(mode);
- if (oflags != -1)
+ if (fd >= 0)
   {
-   int fd = PerlLIO_open3(path,oflags,0666);
-   if (fd >= 0)
+   PerlIOUnix *s;
+   if (*mode == 'I')
+    mode++;
+   if (!f)
     {
-     PerlIOUnix *s = PerlIOSelf(PerlIO_push(f = PerlIO_allocate(aTHX),self,mode,Nullch,0),PerlIOUnix);
-     s->fd     = fd;
-     s->oflags = oflags;
-     PerlIOBase(f)->flags |= PERLIO_F_OPEN;
+     f = PerlIO_allocate(aTHX);
+     s = PerlIOSelf(PerlIO_push(aTHX_ f,self,mode,PerlIOArg),PerlIOUnix);
     }
+   else
+    s = PerlIOSelf(f,PerlIOUnix);
+   s->fd     = fd;
+   s->oflags = imode;
+   PerlIOBase(f)->flags |= PERLIO_F_OPEN;
+   return f;
   }
- return f;
-}
-
-int
-PerlIOUnix_reopen(const char *path, const char *mode, PerlIO *f)
-{
- PerlIOUnix *s = PerlIOSelf(f,PerlIOUnix);
- int oflags = PerlIOUnix_oflags(mode);
- if (PerlIOBase(f)->flags & PERLIO_F_OPEN)
-  (*PerlIOBase(f)->tab->Close)(f);
- if (oflags != -1)
+ else
   {
-   dTHX;
-   int fd = PerlLIO_open3(path,oflags,0666);
-   if (fd >= 0)
+   if (f)
     {
-     s->fd = fd;
-     s->oflags = oflags;
-     PerlIOBase(f)->flags |= PERLIO_F_OPEN;
-     return 0;
+     /* FIXME: pop layers ??? */
     }
+   return NULL;
   }
- return -1;
 }
 
 SSize_t
@@ -1594,12 +1858,11 @@ PerlIO_funcs PerlIO_unix = {
  "unix",
  sizeof(PerlIOUnix),
  PERLIO_K_RAW,
- PerlIOUnix_fileno,
- PerlIOUnix_fdopen,
- PerlIOUnix_open,
- PerlIOUnix_reopen,
  PerlIOUnix_pushed,
  PerlIOBase_noop_ok,
+ PerlIOUnix_open,
+ NULL,
+ PerlIOUnix_fileno,
  PerlIOUnix_read,
  PerlIOBase_unread,
  PerlIOUnix_write,
@@ -1651,52 +1914,9 @@ PerlIOStdio_mode(const char *mode,char *tmode)
  return ret;
 }
 
-PerlIO *
-PerlIOStdio_fdopen(PerlIO_funcs *self, int fd,const char *mode)
-{
- dTHX;
- PerlIO *f = NULL;
- int init = 0;
- char tmode[8];
- if (*mode == 'I')
-  {
-   init = 1;
-   mode++;
-  }
- if (fd >= 0)
-  {
-   FILE *stdio = NULL;
-   if (init)
-    {
-     switch(fd)
-      {
-       case 0:
-        stdio = PerlSIO_stdin;
-        break;
-       case 1:
-        stdio = PerlSIO_stdout;
-        break;
-       case 2:
-        stdio = PerlSIO_stderr;
-        break;
-      }
-    }
-   else
-    {
-     stdio = PerlSIO_fdopen(fd,mode = PerlIOStdio_mode(mode,tmode));
-    }
-   if (stdio)
-    {
-     PerlIOStdio *s = PerlIOSelf(PerlIO_push(f = PerlIO_allocate(aTHX),self,mode,Nullch,0),PerlIOStdio);
-     s->stdio  = stdio;
-    }
-  }
- return f;
-}
-
 /* This isn't used yet ... */
 IV
-PerlIOStdio_pushed(PerlIO *f, const char *mode, const char *arg, STRLEN len)
+PerlIOStdio_pushed(PerlIO *f, const char *mode, SV *arg)
 {
  dTHX;
  if (*PerlIONext(f))
@@ -1709,7 +1929,7 @@ PerlIOStdio_pushed(PerlIO *f, const char *mode, const char *arg, STRLEN len)
    else
     return -1;
   }
- return PerlIOBase_pushed(f,mode,arg,len);
+ return PerlIOBase_pushed(f,mode,arg);
 }
 
 #undef PerlIO_importFILE
@@ -1720,40 +1940,86 @@ PerlIO_importFILE(FILE *stdio, int fl)
  PerlIO *f = NULL;
  if (stdio)
   {
-   PerlIOStdio *s = PerlIOSelf(PerlIO_push(f = PerlIO_allocate(aTHX),&PerlIO_stdio,"r+",Nullch,0),PerlIOStdio);
+   PerlIOStdio *s = PerlIOSelf(PerlIO_push(aTHX_ (f = PerlIO_allocate(aTHX)),&PerlIO_stdio,"r+",Nullsv),PerlIOStdio);
    s->stdio  = stdio;
   }
  return f;
 }
 
 PerlIO *
-PerlIOStdio_open(PerlIO_funcs *self, const char *path,const char *mode)
+PerlIOStdio_open(pTHX_ PerlIO_funcs *self, AV *layers, IV n, const char *mode, int fd, int imode, int perm, PerlIO *f, int narg, SV **args)
 {
- dTHX;
- PerlIO *f = NULL;
- FILE *stdio = PerlSIO_fopen(path,mode);
- if (stdio)
+ char tmode[8];
+ if (f)
   {
-   char tmode[8];
-   PerlIOStdio *s = PerlIOSelf(PerlIO_push(f = PerlIO_allocate(aTHX), self,
-                               (mode = PerlIOStdio_mode(mode,tmode)),Nullch,0),
-                               PerlIOStdio);
-   s->stdio  = stdio;
+   char *path = SvPV_nolen(*args);
+   PerlIOStdio *s = PerlIOSelf(f,PerlIOStdio);
+   FILE *stdio = PerlSIO_freopen(path,(mode = PerlIOStdio_mode(mode,tmode)),s->stdio);
+   if (!s->stdio)
+    return NULL;
+   s->stdio = stdio;
+   return f;
   }
- return f;
-}
-
-int
-PerlIOStdio_reopen(const char *path, const char *mode, PerlIO *f)
-{
- dTHX;
- PerlIOStdio *s = PerlIOSelf(f,PerlIOStdio);
- char tmode[8];
- FILE *stdio = PerlSIO_freopen(path,(mode = PerlIOStdio_mode(mode,tmode)),s->stdio);
- if (!s->stdio)
-  return -1;
- s->stdio = stdio;
- return 0;
+ else
+  {
+   if (narg > 0)
+    {
+     char *path = SvPV_nolen(*args);
+     if (*mode == '#')
+      {
+       mode++;
+       fd = PerlLIO_open3(path,imode,perm);
+      }
+     else
+      {
+       FILE *stdio = PerlSIO_fopen(path,mode);
+       if (stdio)
+        {
+         PerlIOStdio *s = PerlIOSelf(PerlIO_push(aTHX_ (f = PerlIO_allocate(aTHX)), self,
+                                     (mode = PerlIOStdio_mode(mode,tmode)),PerlIOArg),
+                                     PerlIOStdio);
+         s->stdio  = stdio;
+        }
+       return f;
+      }
+    }
+   if (fd >= 0)
+    {
+     FILE *stdio = NULL;
+     int init = 0;
+     if (*mode == 'I')
+      {
+       init = 1;
+       mode++;
+      }
+     if (init)
+      {
+       switch(fd)
+        {
+         case 0:
+          stdio = PerlSIO_stdin;
+          break;
+         case 1:
+          stdio = PerlSIO_stdout;
+          break;
+         case 2:
+          stdio = PerlSIO_stderr;
+          break;
+        }
+      }
+     else
+      {
+       stdio = PerlSIO_fdopen(fd,mode = PerlIOStdio_mode(mode,tmode));
+      }
+     if (stdio)
+      {
+       PerlIOStdio *s = PerlIOSelf(PerlIO_push(aTHX_ (f = PerlIO_allocate(aTHX)),self,mode,PerlIOArg),PerlIOStdio);
+       s->stdio  = stdio;
+       return f;
+      }
+    }
+  }
+ return NULL;
 }
 
 SSize_t
@@ -1994,12 +2260,11 @@ PerlIO_funcs PerlIO_stdio = {
  "stdio",
  sizeof(PerlIOStdio),
  PERLIO_K_BUFFERED,
- PerlIOStdio_fileno,
- PerlIOStdio_fdopen,
- PerlIOStdio_open,
- PerlIOStdio_reopen,
  PerlIOBase_pushed,
  PerlIOBase_noop_ok,
+ PerlIOStdio_open,
+ NULL,
+ PerlIOStdio_fileno,
  PerlIOStdio_read,
  PerlIOStdio_unread,
  PerlIOStdio_write,
@@ -2043,7 +2308,8 @@ PerlIO_exportFILE(PerlIO *f, int fl)
  stdio = fdopen(PerlIO_fileno(f),"r+");
  if (stdio)
   {
-   PerlIOStdio *s = PerlIOSelf(PerlIO_push(f,&PerlIO_stdio,"r+",Nullch,0),PerlIOStdio);
+   dTHX;
+   PerlIOStdio *s = PerlIOSelf(PerlIO_push(aTHX_ f,&PerlIO_stdio,"r+",Nullsv),PerlIOStdio);
    s->stdio  = stdio;
   }
  return stdio;
@@ -2076,68 +2342,65 @@ PerlIO_releaseFILE(PerlIO *p, FILE *f)
 /* perlio buffer layer */
 
 IV
-PerlIOBuf_pushed(PerlIO *f, const char *mode, const char *arg, STRLEN len)
+PerlIOBuf_pushed(PerlIO *f, const char *mode, SV *arg)
 {
  PerlIOBuf *b = PerlIOSelf(f,PerlIOBuf);
- b->posn = PerlIO_tell(PerlIONext(f));
- return PerlIOBase_pushed(f,mode,arg,len);
-}
-
-PerlIO *
-PerlIOBuf_fdopen(PerlIO_funcs *self, int fd, const char *mode)
-{
+ int fd  = PerlIO_fileno(f);
+ Off_t posn;
  dTHX;
- PerlIO_funcs *tab = PerlIO_default_btm();
- int init = 0;
- PerlIO *f;
- if (*mode == 'I')
+ if (fd >= 0 && PerlLIO_isatty(fd))
   {
-   init = 1;
-   mode++;
+   PerlIOBase(f)->flags |= PERLIO_F_LINEBUF|PERLIO_F_TTY;
   }
-#if O_BINARY != O_TEXT
- /* do something about failing setmode()? --jhi */
- PerlLIO_setmode(fd, O_BINARY);
-#endif
- f = (*tab->Fdopen)(tab,fd,mode);
- if (f)
+ posn = PerlIO_tell(PerlIONext(f));
+ if (posn != (Off_t) -1)
   {
-   PerlIOBuf *b = PerlIOSelf(PerlIO_push(f,self,mode,Nullch,0),PerlIOBuf);
-   if (init && fd == 2)
-    {
-     /* Initial stderr is unbuffered */
-     PerlIOBase(f)->flags |= PERLIO_F_UNBUF;
-    }
-#if 0
-   PerlIO_debug("PerlIOBuf_fdopen %s f=%p fd=%d m=%s fl=%08"UVxf"\n",
-                self->name,f,fd,mode,PerlIOBase(f)->flags);
-#endif
+   b->posn = posn;
   }
- return f;
+ return PerlIOBase_pushed(f,mode,arg);
 }
 
 PerlIO *
-PerlIOBuf_open(PerlIO_funcs *self, const char *path, const char *mode)
+PerlIOBuf_open(pTHX_ PerlIO_funcs *self, AV *layers, IV n, const char *mode, int fd, int imode, int perm, PerlIO *f, int narg, SV **args)
 {
- PerlIO_funcs *tab = PerlIO_default_btm();
- PerlIO *f = (*tab->Open)(tab,path,mode);
  if (f)
   {
-   PerlIO_push(f,self,mode,Nullch,0);
+   PerlIO *next = PerlIONext(f);
+   PerlIO_funcs *tab = PerlIO_layer_fetch(aTHX_ layers, n-2, PerlIOBase(next)->tab);
+   next = (*tab->Open)(aTHX_ tab, layers, n-2, mode,fd,imode,perm,next,narg,args);
+   if (!next || (*PerlIOBase(f)->tab->Pushed)(f,mode,PerlIOArg) != 0)
+    {
+     return NULL;
+    }
+  }
+ else
+  {
+   PerlIO_funcs *tab = PerlIO_layer_fetch(aTHX_ layers, n-2, PerlIO_default_btm());
+   int init = 0;
+   if (*mode == 'I')
+    {
+     init = 1;
+     mode++;
+    }
+   f = (*tab->Open)(aTHX_ tab, layers, n-2, mode,fd,imode,perm,NULL,narg,args);
+   if (f)
+    {
+     PerlIOBuf *b = PerlIOSelf(PerlIO_push(aTHX_ f,self,mode,PerlIOArg),PerlIOBuf);
+     fd = PerlIO_fileno(f);
+#if O_BINARY != O_TEXT
+     /* do something about failing setmode()? --jhi */
+     PerlLIO_setmode(fd , O_BINARY);
+#endif
+     if (init && fd == 2)
+      {
+       /* Initial stderr is unbuffered */
+       PerlIOBase(f)->flags |= PERLIO_F_UNBUF;
+      }
+    }
   }
  return f;
 }
 
-int
-PerlIOBuf_reopen(const char *path, const char *mode, PerlIO *f)
-{
- PerlIO *next = PerlIONext(f);
- int code = (*PerlIOBase(next)->tab->Reopen)(path,mode,next);
- if (code = 0)
-  code = (*PerlIOBase(f)->tab->Pushed)(f,mode,Nullch,0);
- return code;
-}
-
 /* This "flush" is akin to sfio's sync in that it handles files in either
    read or write state
 */
@@ -2206,6 +2469,8 @@ PerlIOBuf_fill(PerlIO *f)
   */
  if (PerlIO_flush(f) != 0)
   return -1;
+ if (PerlIOBase(f)->flags & PERLIO_F_TTY)
+  PerlIOBase_flush_linebuf();
 
  if (!b->buf)
   PerlIO_get_base(f); /* allocate via vtable */
@@ -2261,32 +2526,11 @@ SSize_t
 PerlIOBuf_read(PerlIO *f, void *vbuf, Size_t count)
 {
  PerlIOBuf *b  = PerlIOSelf(f,PerlIOBuf);
- STDCHAR *buf  = (STDCHAR *) vbuf;
  if (f)
   {
    if (!b->ptr)
     PerlIO_get_base(f);
-   if (!(PerlIOBase(f)->flags & PERLIO_F_CANREAD))
-    return 0;
-   while (count > 0)
-    {
-     SSize_t avail = PerlIO_get_cnt(f);
-     SSize_t take  = (count < avail) ? count : avail;
-     if (take > 0)
-      {
-       STDCHAR *ptr = PerlIO_get_ptr(f);
-       Copy(ptr,buf,take,STDCHAR);
-       PerlIO_set_ptrcnt(f,ptr+take,(avail -= take));
-       count   -= take;
-       buf     += take;
-      }
-     if (count > 0  && avail <= 0)
-      {
-       if (PerlIO_fill(f) != 0)
-        break;
-      }
-    }
-   return (buf - (STDCHAR *) vbuf);
+   return PerlIOBase_read(f,vbuf,count);
   }
  return 0;
 }
@@ -2428,15 +2672,6 @@ PerlIOBuf_close(PerlIO *f)
  return code;
 }
 
-void
-PerlIOBuf_setlinebuf(PerlIO *f)
-{
- if (f)
-  {
-   PerlIOBase(f)->flags &= ~PERLIO_F_LINEBUF;
-  }
-}
-
 STDCHAR *
 PerlIOBuf_get_ptr(PerlIO *f)
 {
@@ -2507,12 +2742,11 @@ PerlIO_funcs PerlIO_perlio = {
  "perlio",
  sizeof(PerlIOBuf),
  PERLIO_K_BUFFERED,
- PerlIOBase_fileno,
- PerlIOBuf_fdopen,
- PerlIOBuf_open,
- PerlIOBuf_reopen,
  PerlIOBuf_pushed,
  PerlIOBase_noop_ok,
+ PerlIOBuf_open,
+ NULL,
+ PerlIOBase_fileno,
  PerlIOBuf_read,
  PerlIOBuf_unread,
  PerlIOBuf_write,
@@ -2524,7 +2758,7 @@ PerlIO_funcs PerlIO_perlio = {
  PerlIOBase_eof,
  PerlIOBase_error,
  PerlIOBase_clearerr,
- PerlIOBuf_setlinebuf,
+ PerlIOBase_setlinebuf,
  PerlIOBuf_get_base,
  PerlIOBuf_bufsiz,
  PerlIOBuf_get_ptr,
@@ -2563,14 +2797,14 @@ PerlIOPending_seek(PerlIO *f, Off_t offset, int whence)
 IV
 PerlIOPending_flush(PerlIO *f)
 {
+ dTHX;
  PerlIOBuf *b = PerlIOSelf(f,PerlIOBuf);
  if (b->buf && b->buf != (STDCHAR *) &b->oneword)
   {
-   dTHX;
    PerlMemShared_free(b->buf);
    b->buf = NULL;
   }
- PerlIO_pop(f);
+ PerlIO_pop(aTHX_ f);
  return 0;
 }
 
@@ -2588,9 +2822,9 @@ PerlIOPending_set_ptrcnt(PerlIO *f, STDCHAR *ptr, SSize_t cnt)
 }
 
 IV
-PerlIOPending_pushed(PerlIO *f,const char *mode,const char *arg,STRLEN len)
+PerlIOPending_pushed(PerlIO *f,const char *mode,SV *arg)
 {
- IV code    = PerlIOBase_pushed(f,mode,arg,len);
+ IV code    = PerlIOBase_pushed(f,mode,arg);
  PerlIOl *l = PerlIOBase(f);
  /* Our PerlIO_fast_gets must match what we are pushed on,
     or sv_gets() etc. get muddled when it changes mid-string
@@ -2610,22 +2844,24 @@ PerlIOPending_read(PerlIO *f, void *vbuf, Size_t count)
   avail = count;
  if (avail > 0)
   got = PerlIOBuf_read(f,vbuf,avail);
- if (got < count)
-  got += PerlIO_read(f,((STDCHAR *) vbuf)+got,count-got);
+ if (got >= 0 && got < count)
+  {
+   SSize_t more = PerlIO_read(f,((STDCHAR *) vbuf)+got,count-got);
+   if (more >= 0 || got == 0)
+    got += more;
+  }
  return got;
 }
 
-
 PerlIO_funcs PerlIO_pending = {
  "pending",
  sizeof(PerlIOBuf),
  PERLIO_K_BUFFERED,
- PerlIOBase_fileno,
- NULL,
- NULL,
- NULL,
  PerlIOPending_pushed,
  PerlIOBase_noop_ok,
+ NULL,
+ NULL,
+ PerlIOBase_fileno,
  PerlIOPending_read,
  PerlIOBuf_unread,
  PerlIOBuf_write,
@@ -2637,7 +2873,7 @@ PerlIO_funcs PerlIO_pending = {
  PerlIOBase_eof,
  PerlIOBase_error,
  PerlIOBase_clearerr,
- PerlIOBuf_setlinebuf,
+ PerlIOBase_setlinebuf,
  PerlIOBuf_get_base,
  PerlIOBuf_bufsiz,
  PerlIOBuf_get_ptr,
@@ -2661,11 +2897,11 @@ typedef struct
 } PerlIOCrlf;
 
 IV
-PerlIOCrlf_pushed(PerlIO *f, const char *mode,const char *arg,STRLEN len)
+PerlIOCrlf_pushed(PerlIO *f, const char *mode,SV *arg)
 {
  IV code;
  PerlIOBase(f)->flags |= PERLIO_F_CRLF;
- code = PerlIOBuf_pushed(f,mode,arg,len);
+ code = PerlIOBuf_pushed(f,mode,arg);
 #if 0
  PerlIO_debug("PerlIOCrlf_pushed f=%p %s %s fl=%08"UVxf"\n",
               f,PerlIOBase(f)->tab->name,(mode) ? mode : "(Null)",
@@ -2927,12 +3163,11 @@ PerlIO_funcs PerlIO_crlf = {
  "crlf",
  sizeof(PerlIOCrlf),
  PERLIO_K_BUFFERED|PERLIO_K_CANCRLF,
- PerlIOBase_fileno,
- PerlIOBuf_fdopen,
- PerlIOBuf_open,
- PerlIOBuf_reopen,
  PerlIOCrlf_pushed,
  PerlIOBase_noop_ok,   /* popped */
+ PerlIOBuf_open,
+ NULL,
+ PerlIOBase_fileno,
  PerlIOBuf_read,       /* generic read works with ptr/cnt lies ... */
  PerlIOCrlf_unread,    /* Put CR,LF in buffer for each '\n' */
  PerlIOCrlf_write,     /* Put CR,LF in buffer for each '\n' */
@@ -2944,7 +3179,7 @@ PerlIO_funcs PerlIO_crlf = {
  PerlIOBase_eof,
  PerlIOBase_error,
  PerlIOBase_clearerr,
- PerlIOBuf_setlinebuf,
+ PerlIOBase_setlinebuf,
  PerlIOBuf_get_base,
  PerlIOBuf_bufsiz,
  PerlIOBuf_get_ptr,
@@ -3233,12 +3468,11 @@ PerlIO_funcs PerlIO_mmap = {
  "mmap",
  sizeof(PerlIOMmap),
  PERLIO_K_BUFFERED,
- PerlIOBase_fileno,
- PerlIOBuf_fdopen,
- PerlIOBuf_open,
- PerlIOBuf_reopen,
  PerlIOBuf_pushed,
  PerlIOBase_noop_ok,
+ PerlIOBuf_open,
+ NULL,
+ PerlIOBase_fileno,
  PerlIOBuf_read,
  PerlIOMmap_unread,
  PerlIOMmap_write,
@@ -3250,7 +3484,7 @@ PerlIO_funcs PerlIO_mmap = {
  PerlIOBase_eof,
  PerlIOBase_error,
  PerlIOBase_clearerr,
- PerlIOBuf_setlinebuf,
+ PerlIOBase_setlinebuf,
  PerlIOMmap_get_base,
  PerlIOBuf_bufsiz,
  PerlIOBuf_get_ptr,
@@ -3271,14 +3505,15 @@ PerlIO_init(void)
   }
 }
 
-
-
 #undef PerlIO_stdin
 PerlIO *
 PerlIO_stdin(void)
 {
  if (!_perlio)
-  PerlIO_stdstreams();
+  {
+   dTHX;
+   PerlIO_stdstreams(aTHX);
+  }
  return &_perlio[1];
 }
 
@@ -3287,7 +3522,10 @@ PerlIO *
 PerlIO_stdout(void)
 {
  if (!_perlio)
-  PerlIO_stdstreams();
+  {
+   dTHX;
+   PerlIO_stdstreams(aTHX);
+  }
  return &_perlio[2];
 }
 
@@ -3296,7 +3534,10 @@ PerlIO *
 PerlIO_stderr(void)
 {
  if (!_perlio)
-  PerlIO_stdstreams();
+  {
+   dTHX;
+   PerlIO_stdstreams(aTHX);
+  }
  return &_perlio[3];
 }
 
@@ -3375,6 +3616,7 @@ PerlIO_vprintf(PerlIO *f, const char *fmt, va_list ap)
  SV *sv = newSVpvn("",0);
  char *s;
  STRLEN len;
+ SSize_t wrote;
 #ifdef NEED_VA_COPY
  va_list apc;
  Perl_va_copy(ap, apc);
@@ -3383,7 +3625,9 @@ PerlIO_vprintf(PerlIO *f, const char *fmt, va_list ap)
  sv_vcatpvf(sv, fmt, &ap);
 #endif
  s = SvPV(sv,len);
- return PerlIO_write(f,s,len);
+ wrote = PerlIO_write(f,s,len);
+ SvREFCNT_dec(sv);
+ return wrote;
 }
 
 #undef PerlIO_printf
@@ -3421,7 +3665,7 @@ PerlIO_tmpfile(void)
  FILE *stdio = PerlSIO_tmpfile();
  if (stdio)
   {
-   PerlIOStdio *s = PerlIOSelf(PerlIO_push(f = PerlIO_allocate(aTHX),&PerlIO_stdio,"w+",Nullch,0),PerlIOStdio);
+   PerlIOStdio *s = PerlIOSelf(PerlIO_push(aTHX_ (f = PerlIO_allocate(aTHX)),&PerlIO_stdio,"w+",Nullsv),PerlIOStdio);
    s->stdio  = stdio;
   }
  return f;