/* 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 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 (__builtin_expect (slen < maxlen, 0)) __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 = 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)