mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/* Copyright (C) 1991-2014 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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#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;
|
|
{
|
|
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 (__glibc_unlikely (destlen-- == 0))
|
|
__chk_fail ();
|
|
c = *s;
|
|
*(s++ + off) = c;
|
|
}
|
|
while (c != '\0');
|
|
|
|
return dest;
|
|
}
|