1 files changed, 67 insertions, 0 deletions
diff --git a/debug/fgets_chk.c b/debug/fgets_chk.c
new file mode 100644
index 0000000000..27fbede7f0
--- /dev/null
+++ b/debug/fgets_chk.c
@@ -0,0 +1,67 @@
+/* Copyright (C) 1993, 1995, 1996, 1997, 1998, 1999, 2002, 2003, 2005
+   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>
+#include <sys/param.h>
+
+char *
+__fgets_chk (buf, size, n, fp)
+     char *buf;
+     size_t size;
+     int n;
+     _IO_FILE *fp;
+{
+  _IO_size_t count;
+  char *result;
+  CHECK_FILE (fp, NULL);
+  if (n <= 0)
+    return NULL;
+  _IO_acquire_lock (fp);
+  /* This is very tricky since a file descriptor may be in the
+     non-blocking mode. The error flag doesn't mean much in this
+     case. We return an error only when there is a new error. */
+  int old_error = fp->_IO_file_flags & _IO_ERR_SEEN;
+  fp->_IO_file_flags &= ~_IO_ERR_SEEN;
+  count = INTUSE(_IO_getline) (fp, buf, MIN ((size_t) n - 1, size), '\n', 1);
+  /* If we read in some bytes and errno is EAGAIN, that error will
+     be reported for next read. */
+  if (count == 0 || ((fp->_IO_file_flags & _IO_ERR_SEEN)
+		     && errno != EAGAIN))
+    result = NULL;
+  else if (count >= size)
+    __chk_fail ();
+  else
+    {
+      buf[count] = '\0';
+      result = buf;
+    }
+  fp->_IO_file_flags |= old_error;
+  _IO_release_lock (fp);
+  return result;
+}