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-rw-r--r--debug/gets_chk.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/debug/gets_chk.c b/debug/gets_chk.c
new file mode 100644
index 0000000000..3715a39672
--- /dev/null
+++ b/debug/gets_chk.c
@@ -0,0 +1,77 @@
+/* Copyright (C) 1993, 1996, 1997, 1998, 2002, 2003, 2004
+ 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 "../libio/libioP.h"
+#include <limits.h>
+
+char *
+__gets_chk (char *buf, size_t size)
+{
+ _IO_size_t count;
+ int ch;
+ char *retval;
+
+ if (size == 0)
+ __chk_fail ();
+
+ _IO_acquire_lock (_IO_stdin);
+ ch = _IO_getc_unlocked (_IO_stdin);
+ if (ch == EOF)
+ {
+ retval = NULL;
+ goto unlock_return;
+ }
+ if (ch == '\n')
+ count = 0;
+ else
+ {
+ /* 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 = _IO_stdin->_IO_file_flags & _IO_ERR_SEEN;
+ _IO_stdin->_IO_file_flags &= ~_IO_ERR_SEEN;
+ buf[0] = (char) ch;
+ count = INTUSE(_IO_getline) (_IO_stdin, buf + 1, size - 1, '\n', 0) + 1;
+ if (_IO_stdin->_IO_file_flags & _IO_ERR_SEEN)
+ {
+ retval = NULL;
+ goto unlock_return;
+ }
+ else
+ _IO_stdin->_IO_file_flags |= old_error;
+ }
+ if (count >= size)
+ __chk_fail ();
+ buf[count] = 0;
+ retval = buf;
+unlock_return:
+ _IO_release_lock (_IO_stdin);
+ return retval;
+}
+
+link_warning (__gets_chk, "the `gets' function is dangerous and should not be used.")