glibc/debug/realpath_chk.c
Paul Eggert 581c785bf3 Update copyright dates with scripts/update-copyrights
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 7061 files FOO.

I then removed trailing white space from math/tgmath.h,
support/tst-support-open-dev-null-range.c, and
sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following
obscure pre-commit check failure diagnostics from Savannah.  I don't
know why I run into these diagnostics whereas others evidently do not.

remote: *** 912-#endif
remote: *** 913:
remote: *** 914-
remote: *** error: lines with trailing whitespace found
...
remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
2022-01-01 11:40:24 -08:00

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
}