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42 lines
1.5 KiB
C
42 lines
1.5 KiB
C
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/* Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <unistd.h>
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#include <sys/param.h>
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#ifdef HAVE_INLINED_SYSCALLS
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# include <errno.h>
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# include <sysdep.h>
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#endif
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ssize_t
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__readlink_chk (const char *path, void *buf, size_t len, size_t buflen)
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{
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/* In case LEN is greater than BUFLEN, we read BUFLEN+1 bytes.
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This might overflow the buffer but the damage is reduced to just
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one byte. And the program will terminate right away. */
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#ifdef HAVE_INLINED_SYSCALLS
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int n = INLINE_SYSCALL (readlink, 3, path, buf, MIN (len, buflen + 1));
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#else
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int n = __readlink (path, buf, MIN (len, buflen + 1));
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#endif
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if (n > 0 && (size_t) n > buflen)
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__chk_fail ();
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return n;
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}
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