mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-31 22:10:34 +03:00
71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
/* Copyright (C) 1991-2014 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 <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 */
|
|
int
|
|
___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 (__glibc_unlikely (slen < maxlen))
|
|
__chk_fail ();
|
|
|
|
_IO_strnfile sf;
|
|
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 (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 = _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)
|