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/* Copyright (C) 2005 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 <unistd.h>
#include <sys/param.h>
#ifdef HAVE_INLINED_SYSCALLS
# include <errno.h>
# include <sysdep.h>
#endif
ssize_t
__readlink_chk (const char *path, void *buf, size_t len, size_t buflen)
{
/* In case LEN is greater than BUFLEN, we read BUFLEN+1 bytes.
This might overflow the buffer but the damage is reduced to just
one byte. And the program will terminate right away. */
#ifdef HAVE_INLINED_SYSCALLS
int n = INLINE_SYSCALL (readlink, 3, path, buf, MIN (len, buflen + 1));
#else
int n = __readlink (path, buf, MIN (len, buflen + 1));
#endif
if (n > 0 && (size_t) n > buflen)
__chk_fail ();
return n;
}
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