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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /debug/strcpy_chk.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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2.5-18.1
Diffstat (limited to 'debug/strcpy_chk.c')
-rw-r--r--debug/strcpy_chk.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/debug/strcpy_chk.c b/debug/strcpy_chk.c
new file mode 100644
index 0000000000..a4d909feda
--- /dev/null
+++ b/debug/strcpy_chk.c
@@ -0,0 +1,68 @@
+/* Copyright (C) 1991, 1997, 2000, 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. */
+
+#include <stddef.h>
+#include <string.h>
+#include <memcopy.h>
+
+#undef strcpy
+
+/* Copy SRC to DEST with checking of destination buffer overflow. */
+char *
+__strcpy_chk (dest, src, destlen)
+ char *dest;
+ const char *src;
+ size_t destlen;
+{
+ reg_char c;
+ char *s = (char *) src;
+ const ptrdiff_t off = dest - s;
+
+ while (__builtin_expect (destlen >= 4, 0))
+ {
+ c = s[0];
+ s[off] = c;
+ if (c == '\0')
+ return dest;
+ c = s[1];
+ s[off + 1] = c;
+ if (c == '\0')
+ return dest;
+ c = s[2];
+ s[off + 2] = c;
+ if (c == '\0')
+ return dest;
+ c = s[3];
+ s[off + 3] = c;
+ if (c == '\0')
+ return dest;
+ destlen -= 4;
+ s += 4;
+ }
+
+ do
+ {
+ if (__builtin_expect (destlen-- == 0, 0))
+ __chk_fail ();
+ c = *s;
+ *(s++ + off) = c;
+ }
+ while (c != '\0');
+
+ return dest;
+}