libio/wstrops.c - nest-cam/v366/glibc - Git at Google

 /* Copyright (C) 1993,1997-1999,2001-2004, 2006 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
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    The GNU C Library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with the GNU C Library; if not, write to the Free
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.

    As a special exception, if you link the code in this file with
    files compiled with a GNU compiler to produce an executable,
    that does not cause the resulting executable to be covered by
    the GNU Lesser General Public License.  This exception does not
    however invalidate any other reasons why the executable file
    might be covered by the GNU Lesser General Public License.
    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>

 void
 _IO_wstr_init_static (fp, ptr, size, pstart)
      _IO_FILE *fp;
      wchar_t *ptr;
      _IO_size_t size;
      wchar_t *pstart;
 {
   wchar_t *end;

   if (size == 0)
     end = ptr + __wcslen (ptr);
   else if ((_IO_size_t) ptr + size * sizeof (wchar_t) > (_IO_size_t) ptr)
     end = ptr + size;
   else
     /* Even for misaligned ptr make sure there is integral number of wide
        characters.  */
     end = ptr + (-1 - (_IO_size_t) ptr) / sizeof (wchar_t);
   INTUSE(_IO_wsetb) (fp, ptr, end, 0);

   fp->_wide_data->_IO_write_base = ptr;
   fp->_wide_data->_IO_read_base = ptr;
   fp->_wide_data->_IO_read_ptr = ptr;
   if (pstart)
     {
       fp->_wide_data->_IO_write_ptr = pstart;
       fp->_wide_data->_IO_write_end = end;
       fp->_wide_data->_IO_read_end = pstart;
     }
   else
     {
       fp->_wide_data->_IO_write_ptr = ptr;
       fp->_wide_data->_IO_write_end = ptr;
       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_wint_t
 _IO_wstr_overflow (fp, c)
      _IO_FILE *fp;
      _IO_wint_t c;
 {
   int flush_only = c == WEOF;
   _IO_size_t pos;
   if (fp->_flags & _IO_NO_WRITES)
       return flush_only ? 0 : WEOF;
   if ((fp->_flags & _IO_TIED_PUT_GET) && !(fp->_flags & _IO_CURRENTLY_PUTTING))
     {
       fp->_flags |= _IO_CURRENTLY_PUTTING;
       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;
   if (pos >= (_IO_size_t) (_IO_wblen (fp) + flush_only))
     {
       if (fp->_flags2 & _IO_FLAGS2_USER_WBUF) /* 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;
 	  new_buf
 	    = (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (new_size
 									* sizeof (wchar_t));
 	  if (new_buf == NULL)
 	    {
 	      /*	  __ferror(fp) = 1; */
 	      return WEOF;
 	    }
 	  if (old_buf)
 	    {
 	      __wmemcpy (new_buf, old_buf, old_wblen);
 	      (*((_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);
 	  fp->_wide_data->_IO_read_ptr =
 	    new_buf + (fp->_wide_data->_IO_read_ptr - old_buf);
 	  fp->_wide_data->_IO_read_end =
 	    new_buf + (fp->_wide_data->_IO_read_end - old_buf);
 	  fp->_wide_data->_IO_write_ptr =
 	    new_buf + (fp->_wide_data->_IO_write_ptr - old_buf);

 	  fp->_wide_data->_IO_write_base = new_buf;
 	  fp->_wide_data->_IO_write_end = fp->_wide_data->_IO_buf_end;
 	}
     }

   if (!flush_only)
     *fp->_wide_data->_IO_write_ptr++ = c;
   if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end)
     fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr;
   return c;
 }


 _IO_wint_t
 _IO_wstr_underflow (fp)
      _IO_FILE *fp;
 {
   if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end)
     fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr;
   if ((fp->_flags & _IO_TIED_PUT_GET) && (fp->_flags & _IO_CURRENTLY_PUTTING))
     {
       fp->_flags &= ~_IO_CURRENTLY_PUTTING;
       fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_write_ptr;
       fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_end;
     }
   if (fp->_wide_data->_IO_read_ptr < fp->_wide_data->_IO_read_end)
     return *fp->_wide_data->_IO_read_ptr;
   else
     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);
 }


 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;
      _IO_off64_t offset;
      int dir;
      int mode;
 {
   _IO_off64_t new_pos;

   if (mode == 0 && (fp->_flags & _IO_TIED_PUT_GET))
     mode = (fp->_flags & _IO_CURRENTLY_PUTTING ? _IOS_OUTPUT : _IOS_INPUT);

   if (mode == 0)
     {
       /* Don't move any pointers. But there is no clear indication what
 	 mode FP is in. Let's guess. */
       if (fp->_IO_file_flags & _IO_NO_WRITES)
         new_pos = fp->_wide_data->_IO_read_ptr - fp->_wide_data->_IO_read_base;
       else
         new_pos = (fp->_wide_data->_IO_write_ptr
 		   - fp->_wide_data->_IO_write_base);
     }
   else
     {
       _IO_ssize_t cur_size = _IO_wstr_count (fp);
       new_pos = EOF;

       /* Move the get pointer, if requested. */
       if (mode & _IOS_INPUT)
 	{
 	  switch (dir)
 	    {
 	    case _IO_seek_end:
 	      offset += cur_size;
 	      break;
 	    case _IO_seek_cur:
 	      offset += (fp->_wide_data->_IO_read_ptr
 			 - fp->_wide_data->_IO_read_base);
 	      break;
 	    default: /* case _IO_seek_set: */
 	      break;
 	    }
 	  if (offset < 0)
 	    return EOF;
 	  if ((_IO_ssize_t) offset > cur_size
 	      && enlarge_userbuf (fp, offset, 1) != 0)
 	    return EOF;
 	  fp->_wide_data->_IO_read_ptr = (fp->_wide_data->_IO_read_base
 					  + offset);
 	  fp->_wide_data->_IO_read_end = (fp->_wide_data->_IO_read_base
 					  + cur_size);
 	  new_pos = offset;
 	}

       /* Move the put pointer, if requested. */
       if (mode & _IOS_OUTPUT)
 	{
 	  switch (dir)
 	    {
 	    case _IO_seek_end:
 	      offset += cur_size;
 	      break;
 	    case _IO_seek_cur:
 	      offset += (fp->_wide_data->_IO_write_ptr
 			 - fp->_wide_data->_IO_write_base);
 	      break;
 	    default: /* case _IO_seek_set: */
 	      break;
 	    }
 	  if (offset < 0)
 	    return EOF;
 	  if ((_IO_ssize_t) offset > cur_size
 	      && enlarge_userbuf (fp, offset, 0) != 0)
 	    return EOF;
 	  fp->_wide_data->_IO_write_ptr = (fp->_wide_data->_IO_write_base
 					   + offset);
 	  new_pos = offset;
 	}
     }
   return new_pos;
 }

 _IO_wint_t
 _IO_wstr_pbackfail (fp, c)
      _IO_FILE *fp;
      _IO_wint_t c;
 {
   if ((fp->_flags & _IO_NO_WRITES) && c != WEOF)
     return WEOF;
   return INTUSE(_IO_wdefault_pbackfail) (fp, c);
 }

 void
 _IO_wstr_finish (fp, dummy)
      _IO_FILE *fp;
      int dummy;
 {
   if (fp->_wide_data->_IO_buf_base && !(fp->_flags2 & _IO_FLAGS2_USER_WBUF))
     (((_IO_strfile *) fp)->_s._free_buffer) (fp->_wide_data->_IO_buf_base);
   fp->_wide_data->_IO_buf_base = NULL;

   INTUSE(_IO_wdefault_finish) (fp, 0);
 }

 const struct _IO_jump_t _IO_wstr_jumps =
 {
   JUMP_INIT_DUMMY,
   JUMP_INIT(finish, _IO_wstr_finish),
   JUMP_INIT(overflow, (_IO_overflow_t) _IO_wstr_overflow),
   JUMP_INIT(underflow, (_IO_underflow_t) _IO_wstr_underflow),
   JUMP_INIT(uflow, (_IO_underflow_t) INTUSE(_IO_wdefault_uflow)),
   JUMP_INIT(pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail),
   JUMP_INIT(xsputn, INTUSE(_IO_wdefault_xsputn)),
   JUMP_INIT(xsgetn, INTUSE(_IO_wdefault_xsgetn)),
   JUMP_INIT(seekoff, _IO_wstr_seekoff),
   JUMP_INIT(seekpos, _IO_default_seekpos),
   JUMP_INIT(setbuf, _IO_default_setbuf),
   JUMP_INIT(sync, _IO_default_sync),
   JUMP_INIT(doallocate, INTUSE(_IO_wdefault_doallocate)),
   JUMP_INIT(read, _IO_default_read),
   JUMP_INIT(write, _IO_default_write),
   JUMP_INIT(seek, _IO_default_seek),
   JUMP_INIT(close, _IO_default_close),
   JUMP_INIT(stat, _IO_default_stat),
   JUMP_INIT(showmanyc, _IO_default_showmanyc),
   JUMP_INIT(imbue, _IO_default_imbue)
 };
	/* Copyright (C) 1993,1997-1999,2001-2004, 2006 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
	modify it under the terms of the GNU Lesser General Public
	License as published by the Free Software Foundation; either
	version 2.1 of the License, or (at your option) any later version.

	The GNU C Library is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public
	License along with the GNU C Library; if not, write to the Free
	Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	02111-1307 USA.

	As a special exception, if you link the code in this file with
	files compiled with a GNU compiler to produce an executable,
	that does not cause the resulting executable to be covered by
	the GNU Lesser General Public License. This exception does not
	however invalidate any other reasons why the executable file
	might be covered by the GNU Lesser General Public License.
	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>

	void
	_IO_wstr_init_static (fp, ptr, size, pstart)
	_IO_FILE *fp;
	wchar_t *ptr;
	_IO_size_t size;
	wchar_t *pstart;
	{
	wchar_t *end;

	if (size == 0)
	end = ptr + __wcslen (ptr);
	else if ((_IO_size_t) ptr + size * sizeof (wchar_t) > (_IO_size_t) ptr)
	end = ptr + size;
	else
	/* Even for misaligned ptr make sure there is integral number of wide
	characters. */
	end = ptr + (-1 - (_IO_size_t) ptr) / sizeof (wchar_t);
	INTUSE(_IO_wsetb) (fp, ptr, end, 0);

	fp->_wide_data->_IO_write_base = ptr;
	fp->_wide_data->_IO_read_base = ptr;
	fp->_wide_data->_IO_read_ptr = ptr;
	if (pstart)
	{
	fp->_wide_data->_IO_write_ptr = pstart;
	fp->_wide_data->_IO_write_end = end;
	fp->_wide_data->_IO_read_end = pstart;
	}
	else
	{
	fp->_wide_data->_IO_write_ptr = ptr;
	fp->_wide_data->_IO_write_end = ptr;
	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_wint_t
	_IO_wstr_overflow (fp, c)
	_IO_FILE *fp;
	_IO_wint_t c;
	{
	int flush_only = c == WEOF;
	_IO_size_t pos;
	if (fp->_flags & _IO_NO_WRITES)
	return flush_only ? 0 : WEOF;
	if ((fp->_flags & _IO_TIED_PUT_GET) && !(fp->_flags & _IO_CURRENTLY_PUTTING))
	{
	fp->_flags \|= _IO_CURRENTLY_PUTTING;
	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;
	if (pos >= (_IO_size_t) (_IO_wblen (fp) + flush_only))
	{
	if (fp->_flags2 & _IO_FLAGS2_USER_WBUF) /* 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;
	new_buf
	= (wchar_t ) (((_IO_strfile *) fp)->_s._allocate_buffer) (new_size
	* sizeof (wchar_t));
	if (new_buf == NULL)
	{
	/* __ferror(fp) = 1; */
	return WEOF;
	}
	if (old_buf)
	{
	__wmemcpy (new_buf, old_buf, old_wblen);
	(((_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);
	fp->_wide_data->_IO_read_ptr =
	new_buf + (fp->_wide_data->_IO_read_ptr - old_buf);
	fp->_wide_data->_IO_read_end =
	new_buf + (fp->_wide_data->_IO_read_end - old_buf);
	fp->_wide_data->_IO_write_ptr =
	new_buf + (fp->_wide_data->_IO_write_ptr - old_buf);

	fp->_wide_data->_IO_write_base = new_buf;
	fp->_wide_data->_IO_write_end = fp->_wide_data->_IO_buf_end;
	}
	}

	if (!flush_only)
	*fp->_wide_data->_IO_write_ptr++ = c;
	if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end)
	fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr;
	return c;
	}


	_IO_wint_t
	_IO_wstr_underflow (fp)
	_IO_FILE *fp;
	{
	if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end)
	fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr;
	if ((fp->_flags & _IO_TIED_PUT_GET) && (fp->_flags & _IO_CURRENTLY_PUTTING))
	{
	fp->_flags &= ~_IO_CURRENTLY_PUTTING;
	fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_write_ptr;
	fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_end;
	}
	if (fp->_wide_data->_IO_read_ptr < fp->_wide_data->_IO_read_end)
	return *fp->_wide_data->_IO_read_ptr;
	else
	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);
	}


	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;
	_IO_off64_t offset;
	int dir;
	int mode;
	{
	_IO_off64_t new_pos;

	if (mode == 0 && (fp->_flags & _IO_TIED_PUT_GET))
	mode = (fp->_flags & _IO_CURRENTLY_PUTTING ? _IOS_OUTPUT : _IOS_INPUT);

	if (mode == 0)
	{
	/* Don't move any pointers. But there is no clear indication what
	mode FP is in. Let's guess. */
	if (fp->_IO_file_flags & _IO_NO_WRITES)
	new_pos = fp->_wide_data->_IO_read_ptr - fp->_wide_data->_IO_read_base;
	else
	new_pos = (fp->_wide_data->_IO_write_ptr
	- fp->_wide_data->_IO_write_base);
	}
	else
	{
	_IO_ssize_t cur_size = _IO_wstr_count (fp);
	new_pos = EOF;

	/* Move the get pointer, if requested. */
	if (mode & _IOS_INPUT)
	{
	switch (dir)
	{
	case _IO_seek_end:
	offset += cur_size;
	break;
	case _IO_seek_cur:
	offset += (fp->_wide_data->_IO_read_ptr
	- fp->_wide_data->_IO_read_base);
	break;
	default: /* case _IO_seek_set: */
	break;
	}
	if (offset < 0)
	return EOF;
	if ((_IO_ssize_t) offset > cur_size
	&& enlarge_userbuf (fp, offset, 1) != 0)
	return EOF;
	fp->_wide_data->_IO_read_ptr = (fp->_wide_data->_IO_read_base
	+ offset);
	fp->_wide_data->_IO_read_end = (fp->_wide_data->_IO_read_base
	+ cur_size);
	new_pos = offset;
	}

	/* Move the put pointer, if requested. */
	if (mode & _IOS_OUTPUT)
	{
	switch (dir)
	{
	case _IO_seek_end:
	offset += cur_size;
	break;
	case _IO_seek_cur:
	offset += (fp->_wide_data->_IO_write_ptr
	- fp->_wide_data->_IO_write_base);
	break;
	default: /* case _IO_seek_set: */
	break;
	}
	if (offset < 0)
	return EOF;
	if ((_IO_ssize_t) offset > cur_size
	&& enlarge_userbuf (fp, offset, 0) != 0)
	return EOF;
	fp->_wide_data->_IO_write_ptr = (fp->_wide_data->_IO_write_base
	+ offset);
	new_pos = offset;
	}
	}
	return new_pos;
	}

	_IO_wint_t
	_IO_wstr_pbackfail (fp, c)
	_IO_FILE *fp;
	_IO_wint_t c;
	{
	if ((fp->_flags & _IO_NO_WRITES) && c != WEOF)
	return WEOF;
	return INTUSE(_IO_wdefault_pbackfail) (fp, c);
	}

	void
	_IO_wstr_finish (fp, dummy)
	_IO_FILE *fp;
	int dummy;
	{
	if (fp->_wide_data->_IO_buf_base && !(fp->_flags2 & _IO_FLAGS2_USER_WBUF))
	(((_IO_strfile *) fp)->_s._free_buffer) (fp->_wide_data->_IO_buf_base);
	fp->_wide_data->_IO_buf_base = NULL;

	INTUSE(_IO_wdefault_finish) (fp, 0);
	}

	const struct _IO_jump_t _IO_wstr_jumps =
	{
	JUMP_INIT_DUMMY,
	JUMP_INIT(finish, _IO_wstr_finish),
	JUMP_INIT(overflow, (_IO_overflow_t) _IO_wstr_overflow),
	JUMP_INIT(underflow, (_IO_underflow_t) _IO_wstr_underflow),
	JUMP_INIT(uflow, (_IO_underflow_t) INTUSE(_IO_wdefault_uflow)),
	JUMP_INIT(pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail),
	JUMP_INIT(xsputn, INTUSE(_IO_wdefault_xsputn)),
	JUMP_INIT(xsgetn, INTUSE(_IO_wdefault_xsgetn)),
	JUMP_INIT(seekoff, _IO_wstr_seekoff),
	JUMP_INIT(seekpos, _IO_default_seekpos),
	JUMP_INIT(setbuf, _IO_default_setbuf),
	JUMP_INIT(sync, _IO_default_sync),
	JUMP_INIT(doallocate, INTUSE(_IO_wdefault_doallocate)),
	JUMP_INIT(read, _IO_default_read),
	JUMP_INIT(write, _IO_default_write),
	JUMP_INIT(seek, _IO_default_seek),
	JUMP_INIT(close, _IO_default_close),
	JUMP_INIT(stat, _IO_default_stat),
	JUMP_INIT(showmanyc, _IO_default_showmanyc),
	JUMP_INIT(imbue, _IO_default_imbue)
	};