1: /* Copyright (C) 1993, 1995, 1997, 1998, 1999, 2002, 2003, 2007
    2:    Free Software Foundation, Inc.
    3:    This file is part of the GNU C Library.
    4: 
    5:    The GNU C Library is free software; you can redistribute it and/or
    6:    modify it under the terms of the GNU Lesser General Public
    7:    License as published by the Free Software Foundation; either
    8:    version 2.1 of the License, or (at your option) any later version.
    9: 
   10:    The GNU C Library is distributed in the hope that it will be useful,
   11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:    Lesser General Public License for more details.
   14: 
   15:    You should have received a copy of the GNU Lesser General Public
   16:    License along with the GNU C Library; if not, write to the Free
   17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   18:    02111-1307 USA.
   19: 
   20:    As a special exception, if you link the code in this file with
   21:    files compiled with a GNU compiler to produce an executable,
   22:    that does not cause the resulting executable to be covered by
   23:    the GNU Lesser General Public License.  This exception does not
   24:    however invalidate any other reasons why the executable file
   25:    might be covered by the GNU Lesser General Public License.
   26:    This exception applies to code released by its copyright holders
   27:    in files containing the exception.  */
   28: 
   29: #include "libioP.h"
   30: #include <stdio.h>
   31: 
   32: size_t
   33: __fread_chk (void *__restrict ptr, size_t ptrlen,
   34:              size_t size, size_t n, FILE *__restrict stream)
   35: {
   36:   size_t bytes_requested = size * n;
   37:   if (__builtin_expect ((n | size)
   38:                         >= (((size_t) 1) << (8 * sizeof (size_t) / 2)), 0))
   39:     {
   40:       if (size != 0 && bytes_requested / size != n)
   41:         __chk_fail ();
   42:     }
   43: 
   44:   if (__builtin_expect (bytes_requested > ptrlen, 0))
   45:     __chk_fail ();
   46: 
   47:   CHECK_FILE (stream, 0);
   48:   if (bytes_requested == 0)
   49:     return 0;
   50: 
   51:   size_t bytes_read;
   52:   _IO_acquire_lock (stream);
   53:   bytes_read = INTUSE(_IO_sgetn) (stream, (char *) ptr, bytes_requested);
   54:   _IO_release_lock (stream);
   55:   return bytes_requested == bytes_read ? n : bytes_read / size;
   56: }