1  /* Copyright (C) 1994-2023 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  int
      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)