blob: 8e3d99fa5737e35b25bbf8f06b69d50ec7ab313d [file] [log] [blame]
/* Copyright (C) 1991, 1995, 1997, 1998, 2004, 2006, 2009
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
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. */
#include <stdarg.h>
#include <stdio.h>
#include "../libio/libioP.h"
#include "../libio/strfile.h"
extern const struct _IO_jump_t _IO_strn_jumps attribute_hidden;
/* Write formatted output into S, according to the format
string FORMAT, writing no more than MAXLEN characters. */
/* VARARGS5 */
___vsnprintf_chk (char *s, size_t maxlen, int flags, size_t slen,
const char *format, va_list args)
/* XXX Maybe for less strict version do not fail immediately.
Though, maxlen is supposed to be the size of buffer pointed
to by s, so a conforming program can't pass such maxlen
to *snprintf. */
if (__builtin_expect (slen < maxlen, 0))
__chk_fail ();
_IO_strnfile sf;
int ret;
#ifdef _IO_MTSAFE_IO
sf.f._sbf._f._lock = NULL;
/* We need to handle the special case where MAXLEN is 0. Use the
overflow buffer right from the start. */
if (maxlen == 0)
s = sf.overflow_buf;
maxlen = sizeof (sf.overflow_buf);
_IO_no_init (&sf.f._sbf._f, _IO_USER_LOCK, -1, NULL, NULL);
_IO_JUMPS (&sf.f._sbf) = &_IO_strn_jumps;
s[0] = '\0';
/* For flags > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n
can only come from read-only format strings. */
if (flags > 0)
sf.f._sbf._f._flags2 |= _IO_FLAGS2_FORTIFY;
_IO_str_init_static_internal (&sf.f, s, maxlen - 1, s);
ret = INTUSE(_IO_vfprintf) (&sf.f._sbf._f, format, args);
if (sf.f._sbf._f._IO_buf_base != sf.overflow_buf)
*sf.f._sbf._f._IO_write_ptr = '\0';
return ret;
ldbl_hidden_def (___vsnprintf_chk, __vsnprintf_chk)
ldbl_strong_alias (___vsnprintf_chk, __vsnprintf_chk)