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-rw-r--r--debug/vswprintf_chk.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/debug/vswprintf_chk.c b/debug/vswprintf_chk.c
new file mode 100644
index 0000000000..f9a50c6e5d
--- /dev/null
+++ b/debug/vswprintf_chk.c
@@ -0,0 +1,75 @@
+/* Copyright (C) 1991,1995,1997,1998,2004,2005 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. */
+
+#include <stdarg.h>
+#include <wchar.h>
+#include "../libio/libioP.h"
+#include "../libio/strfile.h"
+
+
+/* Write formatted output into S, according to the format
+ string FORMAT, writing no more than MAXLEN characters. */
+/* VARARGS5 */
+int
+__vswprintf_chk (wchar_t *s, size_t maxlen, int flags, size_t slen,
+ const wchar_t *format, va_list args)
+{
+ /* XXX Maybe for less strict version do not fail immediately.
+ Though, maxlen is supposed to be the size of buffer pointed
+ to by s, so a conforming program can't pass such maxlen
+ to *snprintf. */
+ if (__builtin_expect (slen < maxlen, 0))
+ __chk_fail ();
+
+ _IO_wstrnfile sf;
+ struct _IO_wide_data wd;
+ int ret;
+#ifdef _IO_MTSAFE_IO
+ sf.f._sbf._f._lock = NULL;
+#endif
+
+ /* We need to handle the special case where MAXLEN is 0. Use the
+ overflow buffer right from the start. */
+ if (__builtin_expect (maxlen == 0, 0))
+ /* Since we have to write at least the terminating L'\0' a buffer
+ length of zero always makes the function fail. */
+ return -1;
+
+ _IO_no_init (&sf.f._sbf._f, _IO_USER_LOCK, 0, &wd, &_IO_wstrn_jumps);
+ _IO_fwide (&sf.f._sbf._f, 1);
+ s[0] = L'\0';
+
+ /* For flags > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n
+ can only come from read-only format strings. */
+ if (flags > 0)
+ sf.f._sbf._f._flags2 |= _IO_FLAGS2_FORTIFY;
+
+ _IO_wstr_init_static (&sf.f._sbf._f, s, maxlen - 1, s);
+ ret = _IO_vfwprintf ((_IO_FILE *) &sf.f._sbf, format, args);
+
+ if (sf.f._sbf._f._wide_data->_IO_buf_base == sf.overflow_buf)
+ /* ISO C99 requires swprintf/vswprintf to return an error if the
+ output does not fit int he provided buffer. */
+ return -1;
+
+ /* Terminate the string. */
+ *sf.f._sbf._f._wide_data->_IO_write_ptr = '\0';
+
+ return ret;
+}
+libc_hidden_def (__vswprintf_chk)