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-rw-r--r--debug/fread_chk.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/debug/fread_chk.c b/debug/fread_chk.c
new file mode 100644
index 0000000000..2dbe05e155
--- /dev/null
+++ b/debug/fread_chk.c
@@ -0,0 +1,56 @@
+/* Copyright (C) 1993, 1995, 1997, 1998, 1999, 2002, 2003, 2007
+ Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA.
+
+ As a special exception, if you link the code in this file with
+ files compiled with a GNU compiler to produce an executable,
+ that does not cause the resulting executable to be covered by
+ the GNU Lesser General Public License. This exception does not
+ however invalidate any other reasons why the executable file
+ might be covered by the GNU Lesser General Public License.
+ This exception applies to code released by its copyright holders
+ in files containing the exception. */
+
+#include "libioP.h"
+#include <stdio.h>
+
+size_t
+__fread_chk (void *__restrict ptr, size_t ptrlen,
+ size_t size, size_t n, FILE *__restrict stream)
+{
+ size_t bytes_requested = size * n;
+ if (__builtin_expect ((n | size)
+ >= (((size_t) 1) << (8 * sizeof (size_t) / 2)), 0))
+ {
+ if (size != 0 && bytes_requested / size != n)
+ __chk_fail ();
+ }
+
+ if (__builtin_expect (bytes_requested > ptrlen, 0))
+ __chk_fail ();
+
+ CHECK_FILE (stream, 0);
+ if (bytes_requested == 0)
+ return 0;
+
+ size_t bytes_read;
+ _IO_acquire_lock (stream);
+ bytes_read = INTUSE(_IO_sgetn) (stream, (char *) ptr, bytes_requested);
+ _IO_release_lock (stream);
+ return bytes_requested == bytes_read ? n : bytes_read / size;
+}