Debug version of fread.

diff --git a/debug/fread_chk.c b/debug/fread_chk.c
new file mode 100644 (file)
index 0000000..2dbe05e
--- /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;
+}