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66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/* xfts.c -- a wrapper for fts_open
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Copyright (C) 2003, 2005-2007, 2009-2011 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Written by Jim Meyering. */
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#include <config.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <assert.h>
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#include "xalloc.h"
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#include "xfts.h"
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/* Fail with a proper diagnostic if fts_open fails. */
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FTS *
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xfts_open (char * const *argv, int options,
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int (*compar) (const FTSENT **, const FTSENT **))
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{
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FTS *fts = fts_open (argv, options | FTS_CWDFD, compar);
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if (fts == NULL)
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{
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/* This can fail in two ways: out of memory or with errno==EINVAL,
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which indicates it was called with invalid bit_flags. */
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assert (errno != EINVAL);
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xalloc_die ();
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}
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return fts;
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}
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/* When fts_read returns FTS_DC to indicate a directory cycle,
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it may or may not indicate a real problem. When a program like
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chgrp performs a recursive traversal that requires traversing
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symbolic links, it is *not* a problem. However, when invoked
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with "-P -R", it deserves a warning. The fts_options member
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records the options that control this aspect of fts's behavior,
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so test that. */
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bool
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cycle_warning_required (FTS const *fts, FTSENT const *ent)
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{
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#define ISSET(Fts,Opt) ((Fts)->fts_options & (Opt))
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/* When dereferencing no symlinks, or when dereferencing only
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those listed on the command line and we're not processing
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a command-line argument, then a cycle is a serious problem. */
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return ((ISSET (fts, FTS_PHYSICAL) && !ISSET (fts, FTS_COMFOLLOW))
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|| (ISSET (fts, FTS_PHYSICAL) && ISSET (fts, FTS_COMFOLLOW)
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&& ent->fts_level != FTS_ROOTLEVEL));
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}
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