1  /* Copyright (C) 1991-2023 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
      24  ___vsnprintf_chk (char *s, size_t maxlen, int flag, size_t slen,
      25  		  const char *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 __vsnprintf_internal (s, maxlen, format, ap, mode);
      35  }
      36  ldbl_strong_alias (___vsnprintf_chk, __vsnprintf_chk)