summaryrefslogtreecommitdiff
path: root/libssp/strncat-chk.c
diff options
context:
space:
mode:
Diffstat (limited to 'libssp/strncat-chk.c')
-rw-r--r--libssp/strncat-chk.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/libssp/strncat-chk.c b/libssp/strncat-chk.c
new file mode 100644
index 000000000..d8056e843
--- /dev/null
+++ b/libssp/strncat-chk.c
@@ -0,0 +1,119 @@
+/* Checking strncat.
+ Copyright (C) 1991, 1997, 2003, 2004, 2005, 2009 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file. (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+GCC 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 General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
+
+
+#include "config.h"
+#include <ssp/ssp.h>
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif
+
+extern void __chk_fail (void) __attribute__((__noreturn__));
+
+char *
+__strncat_chk (char *__restrict__ dest, const char *__restrict__ src,
+ size_t n, size_t slen)
+{
+ char c;
+ char *s = dest;
+
+ do
+ {
+ if (slen-- == 0)
+ __chk_fail ();
+ c = *dest++;
+ }
+ while (c != '\0');
+
+ ++slen;
+ dest -= 2;
+
+ if (n >= 4)
+ {
+ size_t n4 = n >> 2;
+ do
+ {
+ if (slen-- == 0)
+ __chk_fail ();
+ c = *src++;
+ *++dest = c;
+ if (c == '\0')
+ return s;
+ if (slen-- == 0)
+ __chk_fail ();
+ c = *src++;
+ *++dest = c;
+ if (c == '\0')
+ return s;
+ if (slen-- == 0)
+ __chk_fail ();
+ c = *src++;
+ *++dest = c;
+ if (c == '\0')
+ return s;
+ if (slen-- == 0)
+ __chk_fail ();
+ c = *src++;
+ *++dest = c;
+ if (c == '\0')
+ return s;
+ if (slen-- == 0)
+ __chk_fail ();
+ c = *src++;
+ *++dest = c;
+ if (c == '\0')
+ return s;
+ } while (--n4 > 0);
+ n &= 3;
+ }
+
+ while (n > 0)
+ {
+ if (slen-- == 0)
+ __chk_fail ();
+ c = *src++;
+ *++dest = c;
+ if (c == '\0')
+ return s;
+ n--;
+ }
+
+ if (c != '\0')
+ {
+ if (slen-- == 0)
+ __chk_fail ();
+ *++dest = '\0';
+ }
+
+ return s;
+}