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