/* Copyright (C) 1994-2018 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, see

   <http://www.gnu.org/licenses/>.

   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 "libioP.h"

#include "strfile.h"

static wint_t _IO_wstrn_overflow (FILE *fp, wint_t c) __THROW;

static wint_t

_IO_wstrn_overflow (FILE *fp, wint_t c)

{

  /* When we come to here this means the user supplied buffer is

     filled.  But since we must return the number of characters which

     would have been written in total we must provide a buffer for

     further use.  We can do this by writing on and on in the overflow

     buffer in the _IO_wstrnfile structure.  */

  _IO_wstrnfile *snf = (_IO_wstrnfile *) fp;

  if (fp->_wide_data->_IO_buf_base != snf->overflow_buf)

    {

      _IO_wsetb (fp, snf->overflow_buf,

		 snf->overflow_buf + (sizeof (snf->overflow_buf)

				      / sizeof (wchar_t)), 0);

      fp->_wide_data->_IO_write_base = snf->overflow_buf;

      fp->_wide_data->_IO_read_base = snf->overflow_buf;

      fp->_wide_data->_IO_read_ptr = snf->overflow_buf;

      fp->_wide_data->_IO_read_end = (snf->overflow_buf

				      + (sizeof (snf->overflow_buf)

					 / sizeof (wchar_t)));

    }

  fp->_wide_data->_IO_write_ptr = snf->overflow_buf;

  fp->_wide_data->_IO_write_end = snf->overflow_buf;

  /* Since we are not really interested in storing the characters

     which do not fit in the buffer we simply ignore it.  */

  return c;

}

const struct _IO_jump_t _IO_wstrn_jumps libio_vtable attribute_hidden =

{

  JUMP_INIT_DUMMY,

  JUMP_INIT(finish, _IO_wstr_finish),

  JUMP_INIT(overflow, (_IO_overflow_t) _IO_wstrn_overflow),

  JUMP_INIT(underflow, (_IO_underflow_t) _IO_wstr_underflow),

  JUMP_INIT(uflow, (_IO_underflow_t) _IO_wdefault_uflow),

  JUMP_INIT(pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail),

  JUMP_INIT(xsputn, _IO_wdefault_xsputn),

  JUMP_INIT(xsgetn, _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, _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)

};

int

_IO_vswprintf (wchar_t *string, size_t maxlen, const wchar_t *format,

	       va_list args)

{

  _IO_wstrnfile sf;

  int ret;

  struct _IO_wide_data wd;

#ifdef _IO_MTSAFE_IO

  sf.f._sbf._f._lock = NULL;

#endif

  if (maxlen == 0)

    /* Since we have to write at least the terminating L'\0' a buffer

       length of zero always makes the function fail.  */

    return -1;

  _IO_no_init (&sf.f._sbf._f, _IO_USER_LOCK, 0, &wd, &_IO_wstrn_jumps);

  _IO_fwide (&sf.f._sbf._f, 1);

  string[0] = L'\0';

  _IO_wstr_init_static (&sf.f._sbf._f, string, maxlen - 1, string);

  ret = _IO_vfwprintf ((FILE *) &sf.f._sbf, format, args);

  if (sf.f._sbf._f._wide_data->_IO_buf_base == sf.overflow_buf)

    /* ISO C99 requires swprintf/vswprintf to return an error if the

       output does not fit in the provided buffer.  */

    return -1;

  /* Terminate the string.  */

  *sf.f._sbf._f._wide_data->_IO_write_ptr = '\0';

  return ret;

}

weak_alias (_IO_vswprintf, __vswprintf)

ldbl_weak_alias (_IO_vswprintf, vswprintf)