Re: [PATCH] Interesting syntax idea

[perl5.git] / perlio.c

diff --git a/perlio.c b/perlio.c
index f4a86d8..b8760e7 100644 (file)
--- a/perlio.c
+++ b/perlio.c
@@ -28,12 +28,6 @@
 #define PERL_IN_PERLIO_C
 #include "perl.h"
 
-#undef PerlMemShared_calloc
-#define PerlMemShared_calloc(x,y) calloc(x,y)
-#undef PerlMemShared_free
-#define PerlMemShared_free(x) free(x)
-
-
 #ifndef PERLIO_LAYERS
 int
 PerlIO_apply_layers(pTHX_ PerlIO *f, const char *mode, const char *names)
@@ -1049,26 +1043,15 @@ PerlIOBase_popped(PerlIO *f)
  return 0;
 }
 
-extern PerlIO_funcs PerlIO_pending;
-
 SSize_t
 PerlIOBase_unread(PerlIO *f, const void *vbuf, Size_t count)
 {
-#if 0
  Off_t old = PerlIO_tell(f);
- if (0 && PerlIO_seek(f,-((Off_t)count),SEEK_CUR) == 0)
-  {
-   Off_t new = PerlIO_tell(f);
-   return old - new;
-  }
- else
-  {
-   return 0;
-  }
-#else
+ SSize_t done;
  PerlIO_push(f,&PerlIO_pending,"r",Nullch,0);
- return PerlIOBuf_unread(f,vbuf,count);
-#endif
+ done = PerlIOBuf_unread(f,vbuf,count);
+ PerlIOSelf(f,PerlIOBuf)->posn = old - done;
+ return done;
 }
 
 IV
@@ -1873,7 +1856,7 @@ PerlIOBuf_flush(PerlIO *f)
  if (PerlIOBase(f)->flags & PERLIO_F_WRBUF)
   {
    /* write() the buffer */
-   STDCHAR *buf = PerlIO_get_base(f);
+   STDCHAR *buf = b->buf;
    STDCHAR *p = buf;
    int count;
    PerlIO *n = PerlIONext(f);
@@ -1920,7 +1903,6 @@ PerlIOBuf_fill(PerlIO *f)
 {
  PerlIOBuf *b = PerlIOSelf(f,PerlIOBuf);
  PerlIO *n = PerlIONext(f);
- STDCHAR *buf;
  SSize_t avail;
  /* FIXME: doing the down-stream flush is a bad idea if it causes
     pre-read data in stdio buffer to be discarded
@@ -1933,7 +1915,10 @@ PerlIOBuf_fill(PerlIO *f)
  if (PerlIO_flush(f) != 0)
   return -1;
 
- b->ptr = b->end = buf = PerlIO_get_base(f);
+ if (!b->buf)
+  PerlIO_get_base(f); /* allocate via vtable */
+
+ b->ptr = b->end = b->buf;
  if (PerlIO_fast_gets(n))
   {
    /* Layer below is also buffered
@@ -1975,7 +1960,7 @@ PerlIOBuf_fill(PerlIO *f)
     PerlIOBase(f)->flags |= PERLIO_F_ERROR;
    return -1;
   }
- b->end      = buf+avail;
+ b->end      = b->buf+avail;
  PerlIOBase(f)->flags |= PERLIO_F_RDBUF;
  return 0;
 }
@@ -2313,14 +2298,14 @@ PerlIOPending_set_ptrcnt(PerlIO *f, STDCHAR *ptr, SSize_t cnt)
 IV
 PerlIOPending_pushed(PerlIO *f,const char *mode,const char *arg,STRLEN len)
 {
- IV code    = PerlIOBuf_pushed(f,mode,arg,len);
+ IV code    = PerlIOBase_pushed(f,mode,arg,len);
  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
     when we auto-pop.
   */
- l->flags   = (l->flags & ~PERLIO_F_FASTGETS) |
-              (PerlIOBase(PerlIONext(f))->flags & PERLIO_F_FASTGETS);
+ l->flags   = (l->flags & ~(PERLIO_F_FASTGETS|PERLIO_F_UTF8)) |
+              (PerlIOBase(PerlIONext(f))->flags & (PERLIO_F_FASTGETS|PERLIO_F_UTF8));
  return code;
 }
 
@@ -2752,12 +2737,15 @@ PerlIOMmap_map(PerlIO *f)
         }
        posn = (b->posn / page_size) * page_size;
        len  = st.st_size - posn;
-       m->mptr = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, posn);
+       m->mptr = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, posn);
        if (m->mptr && m->mptr != (Mmap_t) -1)
         {
-#if defined(HAS_MADVISE) && defined(MADV_SEQUENTIAL)
+#if 0 && defined(HAS_MADVISE) && defined(MADV_SEQUENTIAL)
          madvise(m->mptr, len, MADV_SEQUENTIAL);
 #endif
+#if 0 && defined(HAS_MADVISE) && defined(MADV_WILLNEED)
+         madvise(m->mptr, len, MADV_WILLNEED);
+#endif
          PerlIOBase(f)->flags = (flags & ~PERLIO_F_EOF) | PERLIO_F_RDBUF;
          b->end  = ((STDCHAR *)m->mptr) + len;
          b->buf  = ((STDCHAR *)m->mptr) + (b->posn - posn);