1 /* Copyright (C) 1994-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <libio/libioP.h>
19
20 int
___vsprintf_chk(char * s,int flag,size_t slen,const char * format,va_list ap)21 ___vsprintf_chk (char *s, int flag, size_t slen, const char *format,
22 va_list ap)
23 {
24 /* For flag > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n
25 can only come from read-only format strings. */
26 unsigned int mode = (flag > 0) ? PRINTF_FORTIFY : 0;
27
28 /* Regardless of the value of flag, let __vsprintf_internal know that
29 this is a call from *printf_chk. */
30 mode |= PRINTF_CHK;
31
32 if (slen == 0)
33 __chk_fail ();
34
35 return __vsprintf_internal (s, slen, format, ap, mode);
36 }
37 ldbl_hidden_def (___vsprintf_chk, __vsprintf_chk)
38 ldbl_strong_alias (___vsprintf_chk, __vsprintf_chk)
39