1: /* Copyright (C) 1991,1995,1997,1998,2004,2005 Free Software Foundation, Inc.
    2:    This file is part of the GNU C Library.
    3: 
    4:    The GNU C Library is free software; you can redistribute it and/or
    5:    modify it under the terms of the GNU Lesser General Public
    6:    License as published by the Free Software Foundation; either
    7:    version 2.1 of the License, or (at your option) any later version.
    8: 
    9:    The GNU C Library is distributed in the hope that it will be useful,
   10:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   11:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   12:    Lesser General Public License for more details.
   13: 
   14:    You should have received a copy of the GNU Lesser General Public
   15:    License along with the GNU C Library; if not, write to the Free
   16:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   17:    02111-1307 USA.  */
   18: 
   19: #include <stdarg.h>
   20: #include <wchar.h>
   21: #include "../libio/libioP.h"
   22: #include "../libio/strfile.h"
   23: 
   24: 
   25: /* Write formatted output into S, according to the format
   26:    string FORMAT, writing no more than MAXLEN characters.  */
   27: /* VARARGS5 */
   28: int
   29: __vswprintf_chk (wchar_t *s, size_t maxlen, int flags, size_t slen,
   30:                  const wchar_t *format, va_list args)
   31: {
   32:   /* XXX Maybe for less strict version do not fail immediately.
   33:      Though, maxlen is supposed to be the size of buffer pointed
   34:      to by s, so a conforming program can't pass such maxlen
   35:      to *snprintf.  */
   36:   if (__builtin_expect (slen < maxlen, 0))
   37:     __chk_fail ();
   38: 
   39:   _IO_wstrnfile sf;
   40:   struct _IO_wide_data wd;
   41:   int ret;
   42: #ifdef _IO_MTSAFE_IO
   43:   sf.f._sbf._f._lock = NULL;
   44: #endif
   45: 
   46:   /* We need to handle the special case where MAXLEN is 0.  Use the
   47:      overflow buffer right from the start.  */
   48:   if (__builtin_expect (maxlen == 0, 0))
   49:     /* Since we have to write at least the terminating L'\0' a buffer
   50:        length of zero always makes the function fail.  */
   51:     return -1;
   52: 
   53:   _IO_no_init (&sf.f._sbf._f, _IO_USER_LOCK, 0, &wd, &_IO_wstrn_jumps);
   54:   _IO_fwide (&sf.f._sbf._f, 1);
   55:   s[0] = L'\0';
   56: 
   57:   /* For flags > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n
   58:      can only come from read-only format strings.  */
   59:   if (flags > 0)
   60:     sf.f._sbf._f._flags2 |= _IO_FLAGS2_FORTIFY;
   61: 
   62:   _IO_wstr_init_static (&sf.f._sbf._f, s, maxlen - 1, s);
   63:   ret = _IO_vfwprintf ((_IO_FILE *) &sf.f._sbf, format, args);
   64: 
   65:   if (sf.f._sbf._f._wide_data->_IO_buf_base == sf.overflow_buf)
   66:     /* ISO C99 requires swprintf/vswprintf to return an error if the
   67:        output does not fit int he provided buffer.  */
   68:     return -1;
   69: 
   70:   /* Terminate the string.  */
   71:   *sf.f._sbf._f._wide_data->_IO_write_ptr = '\0';
   72: 
   73:   return ret;
   74: }
   75: libc_hidden_def (__vswprintf_chk)