mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-10 07:10:06 +00:00
75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
/* Copyright (C) 1991-2016 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/>. */
|
|
|
|
#include <stdarg.h>
|
|
#include <wchar.h>
|
|
#include "../libio/libioP.h"
|
|
#include "../libio/strfile.h"
|
|
|
|
|
|
/* Write formatted output into S, according to the format
|
|
string FORMAT, writing no more than MAXLEN characters. */
|
|
/* VARARGS5 */
|
|
int
|
|
__vswprintf_chk (wchar_t *s, size_t maxlen, int flags, size_t slen,
|
|
const wchar_t *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 (__glibc_unlikely (slen < maxlen))
|
|
__chk_fail ();
|
|
|
|
_IO_wstrnfile sf;
|
|
struct _IO_wide_data wd;
|
|
int ret;
|
|
#ifdef _IO_MTSAFE_IO
|
|
sf.f._sbf._f._lock = NULL;
|
|
#endif
|
|
|
|
/* We need to handle the special case where MAXLEN is 0. Use the
|
|
overflow buffer right from the start. */
|
|
if (__glibc_unlikely (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);
|
|
s[0] = L'\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_wstr_init_static (&sf.f._sbf._f, s, maxlen - 1, s);
|
|
ret = _IO_vfwprintf ((_IO_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 int he provided buffer. */
|
|
return -1;
|
|
|
|
/* Terminate the string. */
|
|
*sf.f._sbf._f._wide_data->_IO_write_ptr = '\0';
|
|
|
|
return ret;
|
|
}
|
|
libc_hidden_def (__vswprintf_chk)
|