mirror of https://gitee.com/openkylin/glibc.git
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/* Copyright (C) 2005-2022 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <limits.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
|
|
char *
|
|
__realpath_chk (const char *buf, char *resolved, size_t resolvedlen)
|
|
{
|
|
#ifdef PATH_MAX
|
|
if (resolvedlen < PATH_MAX)
|
|
__chk_fail ();
|
|
|
|
return __realpath (buf, resolved);
|
|
#else
|
|
long int pathmax =__pathconf (buf, _PC_PATH_MAX);
|
|
if (pathmax != -1)
|
|
{
|
|
/* We do have a fixed limit. */
|
|
if (resolvedlen < pathmax)
|
|
__chk_fail ();
|
|
|
|
return __realpath (buf, resolved);
|
|
}
|
|
|
|
/* Since there is no fixed limit we check whether the size is large
|
|
enough. */
|
|
char *res = __realpath (buf, NULL);
|
|
if (res != NULL)
|
|
{
|
|
size_t actlen = strlen (res) + 1;
|
|
if (actlen > resolvedlen)
|
|
__chk_fail ();
|
|
|
|
memcpy (resolved, res, actlen);
|
|
free (res);
|
|
res = resolved;
|
|
}
|
|
|
|
return res;
|
|
#endif
|
|
}
|