diff options
Diffstat (limited to 'gl/lib/xfts.c')
-rw-r--r-- | gl/lib/xfts.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/gl/lib/xfts.c b/gl/lib/xfts.c new file mode 100644 index 000000000..b19200e20 --- /dev/null +++ b/gl/lib/xfts.c @@ -0,0 +1,65 @@ +/* xfts.c -- a wrapper for fts_open + + Copyright (C) 2003-2012 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 <http://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)); +} |