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Diffstat (limited to 'debug/wcsncat_chk.c')
-rw-r--r--debug/wcsncat_chk.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/debug/wcsncat_chk.c b/debug/wcsncat_chk.c
new file mode 100644
index 0000000000..b28773ff27
--- /dev/null
+++ b/debug/wcsncat_chk.c
@@ -0,0 +1,96 @@
+/* Copyright (C) 1995, 1996, 1997, 2005 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
+
+ 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 <wchar.h>
+
+
+/* Append no more than N wide-character of SRC onto DEST. */
+wchar_t *
+__wcsncat_chk (wchar_t *dest, const wchar_t *src, size_t n, size_t destlen)
+{
+ wchar_t c;
+ wchar_t * const s = dest;
+
+ /* Find the end of DEST. */
+ do
+ {
+ if (__builtin_expect (destlen-- == 0, 0))
+ __chk_fail ();
+ c = *dest++;
+ }
+ while (c != L'\0');
+
+ /* Make DEST point before next character, so we can increment
+ it while memory is read (wins on pipelined cpus). */
+ ++destlen;
+ dest -= 2;
+
+ if (n >= 4)
+ {
+ size_t n4 = n >> 2;
+ do
+ {
+ if (__builtin_expect (destlen-- == 0, 0))
+ __chk_fail ();
+ c = *src++;
+ *++dest = c;
+ if (c == L'\0')
+ return s;
+ if (__builtin_expect (destlen-- == 0, 0))
+ __chk_fail ();
+ c = *src++;
+ *++dest = c;
+ if (c == L'\0')
+ return s;
+ if (__builtin_expect (destlen-- == 0, 0))
+ __chk_fail ();
+ c = *src++;
+ *++dest = c;
+ if (c == L'\0')
+ return s;
+ if (__builtin_expect (destlen-- == 0, 0))
+ __chk_fail ();
+ c = *src++;
+ *++dest = c;
+ if (c == L'\0')
+ return s;
+ } while (--n4 > 0);
+ n &= 3;
+ }
+
+ while (n > 0)
+ {
+ if (__builtin_expect (destlen-- == 0, 0))
+ __chk_fail ();
+ c = *src++;
+ *++dest = c;
+ if (c == L'\0')
+ return s;
+ n--;
+ }
+
+ if (c != L'\0')
+ {
+ if (__builtin_expect (destlen-- == 0, 0))
+ __chk_fail ();
+ *++dest = L'\0';
+ }
+
+ return s;
+}