1 /* Copyright (C) 1991-2022 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
21 /* Write formatted output into S, according to the format
22 string FORMAT, writing no more than MAXLEN characters. */
23 int
__vswprintf_chk(wchar_t * s,size_t maxlen,int flag,size_t slen,const wchar_t * format,va_list ap)24 __vswprintf_chk (wchar_t *s, size_t maxlen, int flag, size_t slen,
25 const wchar_t *format, va_list ap)
26 {
27 if (__glibc_unlikely (slen < maxlen))
28 __chk_fail ();
29
30 /* For flag > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n
31 can only come from read-only format strings. */
32 unsigned int mode = (flag > 0) ? PRINTF_FORTIFY : 0;
33
34 return __vswprintf_internal (s, maxlen, format, ap, mode);
35 }
36