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glibc/debug/vsnprintf_chk.c
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/* 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 <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) |