(CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.

1 files changed, 45 insertions, 97 deletions

diff --git a/libio/wstrops.c b/libio/wstrops.c
index c5aae7bc6a..32f7ef3cf7 100644
--- a/libio/wstrops.c
+++ b/libio/wstrops.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993,1997-1999,2001-2004, 2006 Free Software Foundation, Inc.
+/* Copyright (C) 1993,1997-1999,2001-2003,2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -25,13 +25,44 @@
    This exception applies to code released by its copyright holders
    in files containing the exception.  */
 
-#include <assert.h>
 #include "strfile.h"
 #include "libioP.h"
 #include <string.h>
 #include <wchar.h>
 #include <stdio_ext.h>
 
+#if 0
+/* The following definitions are for exposition only.
+   They map the terminology used in the ANSI/ISO C++ draft standard
+   to the implementation. */
+
+/* allocated:  set  when a dynamic array object has been allocated, and
+   hence should be freed by the destructor for the strstreambuf object. */
+#define ALLOCATED(FP) ((FP)->_f._IO_buf_base && DYNAMIC(FP))
+
+/* constant:  set when the array object has const elements,
+   so the output sequence cannot be written. */
+#define CONSTANT(FP) ((FP)->_f._IO_file_flags & _IO_NO_WRITES)
+
+/* alsize:  the suggested minimum size for a dynamic array object. */
+#define ALSIZE(FP) ??? /* not stored */
+
+/* palloc: points to the function to call to allocate a dynamic array object.*/
+#define PALLOC(FP) \
+  ((FP)->_s._allocate_buffer == default_alloc ? 0 : (FP)->_s._allocate_buffer)
+
+/* pfree: points  to  the  function  to call to free a dynamic array object. */
+#define PFREE(FP) \
+  ((FP)->_s._free_buffer == default_free ? 0 : (FP)->_s._free_buffer)
+
+#endif
+
+#ifdef TODO
+/* An "unbounded buffer" is when a buffer is supplied, but with no
+   specified length.  An example is the buffer argument to sprintf.
+   */
+#endif
+
 void
 _IO_wstr_init_static (fp, ptr, size, pstart)
      _IO_FILE *fp;
@@ -67,7 +98,7 @@ _IO_wstr_init_static (fp, ptr, size, pstart)
       fp->_wide_data->_IO_read_end = end;
     }
   /* A null _allocate_buffer function flags the strfile as being static. */
-  (((_IO_strfile *) fp)->_s._allocate_buffer) = (_IO_alloc_type)0;
+  (((_IO_strfile *) fp)->_s._allocate_buffer) =  (_IO_alloc_type)0;
 }
 
 _IO_wint_t
@@ -85,19 +116,16 @@ _IO_wstr_overflow (fp, c)
       fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_read_ptr;
       fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_read_end;
     }
-  pos = fp->_wide_data->_IO_write_ptr - fp->_wide_data->_IO_write_base;
+  pos =  fp->_wide_data->_IO_write_ptr - fp->_wide_data->_IO_write_base;
   if (pos >= (_IO_size_t) (_IO_wblen (fp) + flush_only))
     {
-      if (fp->_flags2 & _IO_FLAGS2_USER_WBUF) /* not allowed to enlarge */
+      if (fp->_flags & _IO_USER_BUF) /* not allowed to enlarge */
 	return WEOF;
       else
 	{
 	  wchar_t *new_buf;
 	  wchar_t *old_buf = fp->_wide_data->_IO_buf_base;
-	  size_t old_wblen = _IO_wblen (fp);
-	  _IO_size_t new_size = 2 * old_wblen + 100;
-	  if (new_size < old_wblen)
-	    return EOF;
+	  _IO_size_t new_size = 2 * _IO_wblen (fp) + 100;
 	  new_buf
 	    = (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (new_size
 									* sizeof (wchar_t));
@@ -108,14 +136,11 @@ _IO_wstr_overflow (fp, c)
 	    }
 	  if (old_buf)
 	    {
-	      __wmemcpy (new_buf, old_buf, old_wblen);
+	      __wmemcpy (new_buf, old_buf, _IO_wblen (fp));
 	      (*((_IO_strfile *) fp)->_s._free_buffer) (old_buf);
 	      /* Make sure _IO_setb won't try to delete _IO_buf_base. */
 	      fp->_wide_data->_IO_buf_base = NULL;
 	    }
-
-	  wmemset (new_buf + old_wblen, L'\0', new_size - old_wblen);
-
 	  INTUSE(_IO_wsetb) (fp, new_buf, new_buf + new_size, 1);
 	  fp->_wide_data->_IO_read_base =
 	    new_buf + (fp->_wide_data->_IO_read_base - old_buf);
@@ -138,7 +163,6 @@ _IO_wstr_overflow (fp, c)
   return c;
 }
 
-
 _IO_wint_t
 _IO_wstr_underflow (fp)
      _IO_FILE *fp;
@@ -157,87 +181,17 @@ _IO_wstr_underflow (fp)
     return WEOF;
 }
 
-
 /* The size of the valid part of the buffer.  */
+
 _IO_ssize_t
 _IO_wstr_count (fp)
      _IO_FILE *fp;
 {
-  struct _IO_wide_data *wd = fp->_wide_data;
-
-  return ((wd->_IO_write_ptr > wd->_IO_read_end
-	   ? wd->_IO_write_ptr : wd->_IO_read_end)
-	  - wd->_IO_read_base);
+  return ((fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end
+	   ? fp->_wide_data->_IO_write_ptr : fp->_wide_data->_IO_read_end)
+	  - fp->_wide_data->_IO_read_base);
 }
 
-
-static int
-enlarge_userbuf (_IO_FILE *fp, _IO_off64_t offset, int reading)
-{
-  if ((_IO_ssize_t) offset <= _IO_blen (fp))
-    return 0;
-
-  struct _IO_wide_data *wd = fp->_wide_data;
-
-  _IO_ssize_t oldend = wd->_IO_write_end - wd->_IO_write_base;
-
-  /* Try to enlarge the buffer.  */
-  if (fp->_flags2 & _IO_FLAGS2_USER_WBUF)
-    /* User-provided buffer.  */
-    return 1;
-
-  _IO_size_t newsize = offset + 100;
-  wchar_t *oldbuf = wd->_IO_buf_base;
-  wchar_t *newbuf
-    = (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (newsize
-								* sizeof (wchar_t));
-  if (newbuf == NULL)
-    return 1;
-
-  if (oldbuf != NULL)
-    {
-      __wmemcpy (newbuf, oldbuf, _IO_wblen (fp));
-      (*((_IO_strfile *) fp)->_s._free_buffer) (oldbuf);
-      /* Make sure _IO_setb won't try to delete
-	 _IO_buf_base. */
-      wd->_IO_buf_base = NULL;
-    }
-
-  INTUSE(_IO_wsetb) (fp, newbuf, newbuf + newsize, 1);
-
-  if (reading)
-    {
-      wd->_IO_write_base = newbuf + (wd->_IO_write_base - oldbuf);
-      wd->_IO_write_ptr = newbuf + (wd->_IO_write_ptr - oldbuf);
-      wd->_IO_write_end = newbuf + (wd->_IO_write_end - oldbuf);
-      wd->_IO_read_ptr = newbuf + (wd->_IO_read_ptr - oldbuf);
-
-      wd->_IO_read_base = newbuf;
-      wd->_IO_read_end = wd->_IO_buf_end;
-    }
-  else
-    {
-      wd->_IO_read_base = newbuf + (wd->_IO_read_base - oldbuf);
-      wd->_IO_read_ptr = newbuf + (wd->_IO_read_ptr - oldbuf);
-      wd->_IO_read_end = newbuf + (wd->_IO_read_end - oldbuf);
-      wd->_IO_write_ptr = newbuf + (wd->_IO_write_ptr - oldbuf);
-
-      wd->_IO_write_base = newbuf;
-      wd->_IO_write_end = wd->_IO_buf_end;
-    }
-
-  /* Clear the area between the last write position and th
-     new position.  */
-  assert (offset >= oldend);
-  if (reading)
-    wmemset (wd->_IO_read_base + oldend, L'\0', offset - oldend);
-  else
-    wmemset (wd->_IO_write_base + oldend, L'\0', offset - oldend);
-
-  return 0;
-}
-
-
 _IO_off64_t
 _IO_wstr_seekoff (fp, offset, dir, mode)
      _IO_FILE *fp;
@@ -280,10 +234,7 @@ _IO_wstr_seekoff (fp, offset, dir, mode)
 	    default: /* case _IO_seek_set: */
 	      break;
 	    }
-	  if (offset < 0)
-	    return EOF;
-	  if ((_IO_ssize_t) offset > cur_size
-	      && enlarge_userbuf (fp, offset, 1) != 0)
+	  if (offset < 0 || (_IO_ssize_t) offset > cur_size)
 	    return EOF;
 	  fp->_wide_data->_IO_read_ptr = (fp->_wide_data->_IO_read_base
 					  + offset);
@@ -307,10 +258,7 @@ _IO_wstr_seekoff (fp, offset, dir, mode)
 	    default: /* case _IO_seek_set: */
 	      break;
 	    }
-	  if (offset < 0)
-	    return EOF;
-	  if ((_IO_ssize_t) offset > cur_size
-	      && enlarge_userbuf (fp, offset, 0) != 0)
+	  if (offset < 0 || (_IO_ssize_t) offset > cur_size)
 	    return EOF;
 	  fp->_wide_data->_IO_write_ptr = (fp->_wide_data->_IO_write_base
 					   + offset);
@@ -335,7 +283,7 @@ _IO_wstr_finish (fp, dummy)
      _IO_FILE *fp;
      int dummy;
 {
-  if (fp->_wide_data->_IO_buf_base && !(fp->_flags2 & _IO_FLAGS2_USER_WBUF))
+  if (fp->_wide_data->_IO_buf_base && !(fp->_flags & _IO_USER_BUF))
     (((_IO_strfile *) fp)->_s._free_buffer) (fp->_wide_data->_IO_buf_base);
   fp->_wide_data->_IO_buf_base = NULL;