66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/* xfts.c -- a wrapper for fts_open
|
|
|
|
Copyright (C) 2003-2022 Free Software Foundation, Inc.
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
/* Written by Jim Meyering. */
|
|
|
|
#include <config.h>
|
|
|
|
#include <stdbool.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
|
|
#include "xalloc.h"
|
|
#include "xfts.h"
|
|
|
|
/* Fail with a proper diagnostic if fts_open fails. */
|
|
|
|
FTS *
|
|
xfts_open (char * const *argv, int options,
|
|
int (*compar) (const FTSENT **, const FTSENT **))
|
|
{
|
|
FTS *fts = fts_open (argv, options | FTS_CWDFD, compar);
|
|
if (fts == NULL)
|
|
{
|
|
/* This can fail in two ways: out of memory or with errno==EINVAL,
|
|
which indicates it was called with invalid bit_flags. */
|
|
assert (errno != EINVAL);
|
|
xalloc_die ();
|
|
}
|
|
|
|
return fts;
|
|
}
|
|
|
|
/* When fts_read returns FTS_DC to indicate a directory cycle,
|
|
it may or may not indicate a real problem. When a program like
|
|
chgrp performs a recursive traversal that requires traversing
|
|
symbolic links, it is *not* a problem. However, when invoked
|
|
with "-P -R", it deserves a warning. The fts_options member
|
|
records the options that control this aspect of fts's behavior,
|
|
so test that. */
|
|
bool
|
|
cycle_warning_required (FTS const *fts, FTSENT const *ent)
|
|
{
|
|
#define ISSET(Fts,Opt) ((Fts)->fts_options & (Opt))
|
|
/* When dereferencing no symlinks, or when dereferencing only
|
|
those listed on the command line and we're not processing
|
|
a command-line argument, then a cycle is a serious problem. */
|
|
return ((ISSET (fts, FTS_PHYSICAL) && !ISSET (fts, FTS_COMFOLLOW))
|
|
|| (ISSET (fts, FTS_PHYSICAL) && ISSET (fts, FTS_COMFOLLOW)
|
|
&& ent->fts_level != FTS_ROOTLEVEL));
|
|
}
|