1266 lines
32 KiB
C
1266 lines
32 KiB
C
/* $NetBSD: fts.c,v 1.44 2012/03/14 00:25:19 christos Exp $ */
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/*-
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if 0
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static char sccsid[] = "@(#)fts.c 8.6 (Berkeley) 8/14/94";
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#else
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/* __RCSID("$NetBSD: fts.c,v 1.44 2012/03/14 00:25:19 christos Exp $"); */
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#endif
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#define _BSD_SOURCE
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#include <limits.h>
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/* #include "namespace.h" */
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#else
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#include <stdio.h>
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#endif
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#include <sys/stat.h>
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#include <assert.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include "gawkfts.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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#include "gawkdirfd.h"
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#if ! defined(S_ISREG) && defined(S_IFREG)
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#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
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#endif
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/*
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#if ! HAVE_NBTOOL_CONFIG_H
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#define HAVE_STRUCT_DIRENT_D_NAMLEN
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#endif
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*/
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#ifndef MAX
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static int MAX(int x, int y)
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{
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if (x > y)
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return x;
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return y;
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}
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#endif
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static FTSENT *fts_alloc(FTS *, const char *, size_t);
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static FTSENT *fts_build(FTS *, int);
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static void fts_free(FTSENT *);
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static void fts_lfree(FTSENT *);
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static void fts_load(FTS *, FTSENT *);
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static size_t fts_maxarglen(char * const *);
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static size_t fts_pow2(size_t);
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static int fts_palloc(FTS *, size_t);
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static void fts_padjust(FTS *, FTSENT *);
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static FTSENT *fts_sort(FTS *, FTSENT *, size_t);
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static unsigned short fts_stat(FTS *, FTSENT *, int);
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static int fts_safe_changedir(const FTS *, const FTSENT *, int,
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const char *);
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#if defined(ALIGNBYTES) && defined(ALIGN)
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#define FTS_ALLOC_ALIGNED 1
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#else
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#undef FTS_ALLOC_ALIGNED
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#endif
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#ifndef ftsent_namelen_truncate
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#define ftsent_namelen_truncate(a) \
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((a) > UINT_MAX ? UINT_MAX : (unsigned int)(a))
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#endif
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#ifndef ftsent_pathlen_truncate
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#define ftsent_pathlen_truncate(a) \
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((a) > UINT_MAX ? UINT_MAX : (unsigned int)(a))
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#endif
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#ifndef fts_pathlen_truncate
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#define fts_pathlen_truncate(a) \
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((a) > UINT_MAX ? UINT_MAX : (unsigned int)(a))
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#endif
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#ifndef fts_nitems_truncate
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#define fts_nitems_truncate(a) \
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((a) > UINT_MAX ? UINT_MAX : (unsigned int)(a))
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#endif
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#define ISDOT(a) (a[0] == '.' && (!a[1] || (a[1] == '.' && !a[2])))
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#define CLR(opt) (sp->fts_options &= ~(opt))
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#define ISSET(opt) (sp->fts_options & (opt))
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#define SET(opt) (sp->fts_options |= (opt))
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#define CHDIR(sp, path) (!ISSET(FTS_NOCHDIR) && chdir(path))
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#define FCHDIR(sp, fd) (!ISSET(FTS_NOCHDIR) && fchdir(fd))
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/* fts_build flags */
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#define BCHILD 1 /* fts_children */
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#define BNAMES 2 /* fts_children, names only */
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#define BREAD 3 /* fts_read */
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#ifndef DTF_HIDEW
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#undef FTS_WHITEOUT
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#endif
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#define _DIAGASSERT(expression)
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#ifndef MAXPATHLEN
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#define MAXPATHLEN 1024 /* a guess */
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#endif
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FTS *
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fts_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 *sp;
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FTSENT *p, *root;
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size_t nitems;
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FTSENT *parent, *tmp = NULL; /* pacify gcc */
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size_t len;
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_DIAGASSERT(argv != NULL);
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/* Options check. */
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if (options & ~FTS_OPTIONMASK) {
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errno = EINVAL;
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return (NULL);
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}
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/* Allocate/initialize the stream */
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if ((sp = calloc(1, (unsigned int)sizeof(FTS))) == NULL)
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return (NULL);
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sp->fts_compar = compar;
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sp->fts_options = options;
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/* Logical walks turn on NOCHDIR; symbolic links are too hard. */
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if (ISSET(FTS_LOGICAL))
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SET(FTS_NOCHDIR);
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/*
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* Start out with 1K of path space, and enough, in any case,
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* to hold the user's paths.
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*/
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if (fts_palloc(sp, MAX(fts_maxarglen(argv), MAXPATHLEN)))
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goto mem1;
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/* Allocate/initialize root's parent. */
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if ((parent = fts_alloc(sp, "", 0)) == NULL)
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goto mem2;
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parent->fts_level = FTS_ROOTPARENTLEVEL;
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/* Allocate/initialize root(s). */
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for (root = NULL, nitems = 0; *argv; ++argv, ++nitems) {
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/* Don't allow zero-length paths. */
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if ((len = strlen(*argv)) == 0) {
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errno = ENOENT;
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goto mem3;
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}
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if ((p = fts_alloc(sp, *argv, len)) == NULL)
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goto mem3;
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p->fts_level = FTS_ROOTLEVEL;
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p->fts_parent = parent;
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p->fts_accpath = p->fts_name;
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p->fts_info = fts_stat(sp, p, ISSET(FTS_COMFOLLOW));
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/* Command-line "." and ".." are real directories. */
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if (p->fts_info == FTS_DOT)
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p->fts_info = FTS_D;
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/*
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* If comparison routine supplied, traverse in sorted
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* order; otherwise traverse in the order specified.
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*/
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if (compar) {
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p->fts_link = root;
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root = p;
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} else {
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p->fts_link = NULL;
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if (root == NULL)
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tmp = root = p;
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else {
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tmp->fts_link = p;
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tmp = p;
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}
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}
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}
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if (compar && nitems > 1)
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root = fts_sort(sp, root, nitems);
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/*
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* Allocate a dummy pointer and make fts_read think that we've just
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* finished the node before the root(s); set p->fts_info to FTS_INIT
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* so that everything about the "current" node is ignored.
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*/
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if ((sp->fts_cur = fts_alloc(sp, "", 0)) == NULL)
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goto mem4;
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sp->fts_cur->fts_link = root;
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sp->fts_cur->fts_info = FTS_INIT;
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/*
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* If using chdir(2), grab a file descriptor pointing to dot to insure
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* that we can get back here; this could be avoided for some paths,
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* but almost certainly not worth the effort. Slashes, symbolic links,
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* and ".." are all fairly nasty problems. Note, if we can't get the
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* descriptor we run anyway, just more slowly.
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*/
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#ifndef O_CLOEXEC
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#define O_CLOEXEC 0
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#endif
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if (!ISSET(FTS_NOCHDIR)) {
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if ((sp->fts_rfd = open(".", O_RDONLY | O_CLOEXEC, 0)) == -1)
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SET(FTS_NOCHDIR);
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}
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if (nitems == 0)
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fts_free(parent);
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return (sp);
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mem4: if (sp->fts_array != NULL)
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free(sp->fts_array);
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mem3: fts_lfree(root);
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fts_free(parent);
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mem2: free(sp->fts_path);
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mem1: free(sp);
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return (NULL);
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}
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static void
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fts_load(FTS *sp, FTSENT *p)
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{
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size_t len;
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char *cp;
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_DIAGASSERT(sp != NULL);
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_DIAGASSERT(p != NULL);
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/*
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* Load the stream structure for the next traversal. Since we don't
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* actually enter the directory until after the preorder visit, set
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* the fts_accpath field specially so the chdir gets done to the right
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* place and the user can access the first node. From fts_open it's
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* known that the path will fit.
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*/
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len = p->fts_pathlen = p->fts_namelen;
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memmove(sp->fts_path, p->fts_name, len + 1);
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if ((cp = strrchr(p->fts_name, '/')) && (cp != p->fts_name || cp[1])) {
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len = strlen(++cp);
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memmove(p->fts_name, cp, len + 1);
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p->fts_namelen = ftsent_namelen_truncate(len);
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}
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p->fts_accpath = p->fts_path = sp->fts_path;
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sp->fts_dev = p->fts_dev;
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}
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int
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fts_close(FTS *sp)
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{
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FTSENT *freep, *p;
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int saved_errno = 0;
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_DIAGASSERT(sp != NULL);
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/*
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* This still works if we haven't read anything -- the dummy structure
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* points to the root list, so we step through to the end of the root
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* list which has a valid parent pointer.
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*/
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if (sp->fts_cur) {
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if (sp->fts_cur->fts_flags & FTS_SYMFOLLOW)
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(void)close(sp->fts_cur->fts_symfd);
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for (p = sp->fts_cur; p->fts_level >= FTS_ROOTLEVEL;) {
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freep = p;
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p = p->fts_link ? p->fts_link : p->fts_parent;
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fts_free(freep);
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}
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fts_free(p);
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}
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/* Free up child linked list, sort array, path buffer. */
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if (sp->fts_child)
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fts_lfree(sp->fts_child);
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if (sp->fts_array)
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free(sp->fts_array);
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free(sp->fts_path);
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/* Return to original directory, save errno if necessary. */
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if (!ISSET(FTS_NOCHDIR)) {
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if (fchdir(sp->fts_rfd) == -1)
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saved_errno = errno;
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(void)close(sp->fts_rfd);
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}
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/* Free up the stream pointer. */
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free(sp);
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if (saved_errno) {
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errno = saved_errno;
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return -1;
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}
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return 0;
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}
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#if !defined(__FTS_COMPAT_TAILINGSLASH)
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/*
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* Special case of "/" at the end of the path so that slashes aren't
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* appended which would cause paths to be written as "....//foo".
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*/
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#define NAPPEND(p) \
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(p->fts_path[p->fts_pathlen - 1] == '/' \
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? p->fts_pathlen - 1 : p->fts_pathlen)
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#else /* !defined(__FTS_COMPAT_TAILINGSLASH) */
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/*
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* compatibility with the old behaviour.
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*
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* Special case a root of "/" so that slashes aren't appended which would
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* cause paths to be written as "//foo".
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*/
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#define NAPPEND(p) \
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(p->fts_level == FTS_ROOTLEVEL && p->fts_pathlen == 1 && \
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p->fts_path[0] == '/' ? 0 : p->fts_pathlen)
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#endif /* !defined(__FTS_COMPAT_TAILINGSLASH) */
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FTSENT *
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fts_read(FTS *sp)
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{
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FTSENT *p, *tmp;
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int instr;
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char *t;
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int saved_errno;
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_DIAGASSERT(sp != NULL);
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/* If finished or unrecoverable error, return NULL. */
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if (sp->fts_cur == NULL || ISSET(FTS_STOP))
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return (NULL);
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/* Set current node pointer. */
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p = sp->fts_cur;
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/* Save and zero out user instructions. */
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instr = p->fts_instr;
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p->fts_instr = FTS_NOINSTR;
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/* Any type of file may be re-visited; re-stat and re-turn. */
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if (instr == FTS_AGAIN) {
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p->fts_info = fts_stat(sp, p, 0);
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return (p);
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}
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/*
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* Following a symlink -- SLNONE test allows application to see
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* SLNONE and recover. If indirecting through a symlink, have
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* keep a pointer to current location. If unable to get that
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* pointer, follow fails.
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*/
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if (instr == FTS_FOLLOW &&
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(p->fts_info == FTS_SL || p->fts_info == FTS_SLNONE)) {
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p->fts_info = fts_stat(sp, p, 1);
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if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) {
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if ((p->fts_symfd = open(".", O_RDONLY | O_CLOEXEC, 0))
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== -1) {
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p->fts_errno = errno;
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p->fts_info = FTS_ERR;
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} else
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p->fts_flags |= FTS_SYMFOLLOW;
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}
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return (p);
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}
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/* Directory in pre-order. */
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if (p->fts_info == FTS_D) {
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/* If skipped or crossed mount point, do post-order visit. */
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if (instr == FTS_SKIP ||
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(ISSET(FTS_XDEV) && p->fts_dev != sp->fts_dev)) {
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if (p->fts_flags & FTS_SYMFOLLOW)
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(void)close(p->fts_symfd);
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if (sp->fts_child) {
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fts_lfree(sp->fts_child);
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sp->fts_child = NULL;
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}
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p->fts_info = FTS_DP;
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return (p);
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}
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/* Rebuild if only read the names and now traversing. */
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if (sp->fts_child && ISSET(FTS_NAMEONLY)) {
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CLR(FTS_NAMEONLY);
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fts_lfree(sp->fts_child);
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sp->fts_child = NULL;
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}
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/*
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* Cd to the subdirectory.
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*
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* If have already read and now fail to chdir, whack the list
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* to make the names come out right, and set the parent errno
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* so the application will eventually get an error condition.
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* Set the FTS_DONTCHDIR flag so that when we logically change
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* directories back to the parent we don't do a chdir.
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*
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* If haven't read do so. If the read fails, fts_build sets
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* FTS_STOP or the fts_info field of the node.
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*/
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if (sp->fts_child) {
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if (fts_safe_changedir(sp, p, -1, p->fts_accpath)) {
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p->fts_errno = errno;
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p->fts_flags |= FTS_DONTCHDIR;
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for (p = sp->fts_child; p; p = p->fts_link)
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p->fts_accpath =
|
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p->fts_parent->fts_accpath;
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}
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} else if ((sp->fts_child = fts_build(sp, BREAD)) == NULL) {
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if (ISSET(FTS_STOP))
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return (NULL);
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return (p);
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}
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p = sp->fts_child;
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sp->fts_child = NULL;
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goto name;
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}
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|
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/* Move to the next node on this level. */
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next: tmp = p;
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if ((p = p->fts_link) != NULL) {
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fts_free(tmp);
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|
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/*
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* If reached the top, return to the original directory, and
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* load the paths for the next root.
|
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*/
|
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if (p->fts_level == FTS_ROOTLEVEL) {
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if (FCHDIR(sp, sp->fts_rfd)) {
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SET(FTS_STOP);
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return (NULL);
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}
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fts_load(sp, p);
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return (sp->fts_cur = p);
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}
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|
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/*
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* User may have called fts_set on the node. If skipped,
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* ignore. If followed, get a file descriptor so we can
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* get back if necessary.
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*/
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if (p->fts_instr == FTS_SKIP)
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goto next;
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if (p->fts_instr == FTS_FOLLOW) {
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p->fts_info = fts_stat(sp, p, 1);
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if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) {
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if ((p->fts_symfd =
|
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open(".", O_RDONLY | O_CLOEXEC, 0)) == -1) {
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p->fts_errno = errno;
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p->fts_info = FTS_ERR;
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} else
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p->fts_flags |= FTS_SYMFOLLOW;
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}
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p->fts_instr = FTS_NOINSTR;
|
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}
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name: t = sp->fts_path + NAPPEND(p->fts_parent);
|
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*t++ = '/';
|
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memmove(t, p->fts_name, (size_t)(p->fts_namelen + 1));
|
|
return (sp->fts_cur = p);
|
|
}
|
|
|
|
/* Move up to the parent node. */
|
|
p = tmp->fts_parent;
|
|
fts_free(tmp);
|
|
|
|
if (p->fts_level == FTS_ROOTPARENTLEVEL) {
|
|
/*
|
|
* Done; free everything up and set errno to 0 so the user
|
|
* can distinguish between error and EOF.
|
|
*/
|
|
fts_free(p);
|
|
errno = 0;
|
|
return (sp->fts_cur = NULL);
|
|
}
|
|
|
|
/* Nul terminate the pathname. */
|
|
sp->fts_path[p->fts_pathlen] = '\0';
|
|
|
|
/*
|
|
* Return to the parent directory. If at a root node or came through
|
|
* a symlink, go back through the file descriptor. Otherwise, cd up
|
|
* one directory.
|
|
*/
|
|
if (p->fts_level == FTS_ROOTLEVEL) {
|
|
if (FCHDIR(sp, sp->fts_rfd)) {
|
|
SET(FTS_STOP);
|
|
return (NULL);
|
|
}
|
|
} else if (p->fts_flags & FTS_SYMFOLLOW) {
|
|
if (FCHDIR(sp, p->fts_symfd)) {
|
|
saved_errno = errno;
|
|
(void)close(p->fts_symfd);
|
|
errno = saved_errno;
|
|
SET(FTS_STOP);
|
|
return (NULL);
|
|
}
|
|
(void)close(p->fts_symfd);
|
|
} else if (!(p->fts_flags & FTS_DONTCHDIR) &&
|
|
fts_safe_changedir(sp, p->fts_parent, -1, "..")) {
|
|
SET(FTS_STOP);
|
|
return (NULL);
|
|
}
|
|
p->fts_info = p->fts_errno ? FTS_ERR : FTS_DP;
|
|
return (sp->fts_cur = p);
|
|
}
|
|
|
|
/*
|
|
* Fts_set takes the stream as an argument although it's not used in this
|
|
* implementation; it would be necessary if anyone wanted to add global
|
|
* semantics to fts using fts_set. An error return is allowed for similar
|
|
* reasons.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
fts_set(FTS *sp, FTSENT *p, int instr)
|
|
{
|
|
(void) sp; /* silence warnings */
|
|
_DIAGASSERT(sp != NULL);
|
|
_DIAGASSERT(p != NULL);
|
|
|
|
if (instr && instr != FTS_AGAIN && instr != FTS_FOLLOW &&
|
|
instr != FTS_NOINSTR && instr != FTS_SKIP) {
|
|
errno = EINVAL;
|
|
return (1);
|
|
}
|
|
p->fts_instr = instr;
|
|
return (0);
|
|
}
|
|
|
|
FTSENT *
|
|
fts_children(FTS *sp, int instr)
|
|
{
|
|
FTSENT *p;
|
|
int fd;
|
|
|
|
_DIAGASSERT(sp != NULL);
|
|
|
|
if (instr && instr != FTS_NAMEONLY) {
|
|
errno = EINVAL;
|
|
return (NULL);
|
|
}
|
|
|
|
/* Set current node pointer. */
|
|
p = sp->fts_cur;
|
|
|
|
/*
|
|
* Errno set to 0 so user can distinguish empty directory from
|
|
* an error.
|
|
*/
|
|
errno = 0;
|
|
|
|
/* Fatal errors stop here. */
|
|
if (ISSET(FTS_STOP))
|
|
return (NULL);
|
|
|
|
/* Return logical hierarchy of user's arguments. */
|
|
if (p->fts_info == FTS_INIT)
|
|
return (p->fts_link);
|
|
|
|
/*
|
|
* If not a directory being visited in pre-order, stop here. Could
|
|
* allow FTS_DNR, assuming the user has fixed the problem, but the
|
|
* same effect is available with FTS_AGAIN.
|
|
*/
|
|
if (p->fts_info != FTS_D /* && p->fts_info != FTS_DNR */)
|
|
return (NULL);
|
|
|
|
/* Free up any previous child list. */
|
|
if (sp->fts_child)
|
|
fts_lfree(sp->fts_child);
|
|
|
|
if (instr == FTS_NAMEONLY) {
|
|
SET(FTS_NAMEONLY);
|
|
instr = BNAMES;
|
|
} else
|
|
instr = BCHILD;
|
|
|
|
/*
|
|
* If using chdir on a relative path and called BEFORE fts_read does
|
|
* its chdir to the root of a traversal, we can lose -- we need to
|
|
* chdir into the subdirectory, and we don't know where the current
|
|
* directory is, so we can't get back so that the upcoming chdir by
|
|
* fts_read will work.
|
|
*/
|
|
if (p->fts_level != FTS_ROOTLEVEL || p->fts_accpath[0] == '/' ||
|
|
ISSET(FTS_NOCHDIR))
|
|
return (sp->fts_child = fts_build(sp, instr));
|
|
|
|
if ((fd = open(".", O_RDONLY, 0)) == -1)
|
|
return (sp->fts_child = NULL);
|
|
sp->fts_child = fts_build(sp, instr);
|
|
if (fchdir(fd)) {
|
|
(void)close(fd);
|
|
return (NULL);
|
|
}
|
|
(void)close(fd);
|
|
return (sp->fts_child);
|
|
}
|
|
|
|
/*
|
|
* This is the tricky part -- do not casually change *anything* in here. The
|
|
* idea is to build the linked list of entries that are used by fts_children
|
|
* and fts_read. There are lots of special cases.
|
|
*
|
|
* The real slowdown in walking the tree is the stat calls. If FTS_NOSTAT is
|
|
* set and it's a physical walk (so that symbolic links can't be directories),
|
|
* we can do things quickly. First, if it's a 4.4BSD file system, the type
|
|
* of the file is in the directory entry. Otherwise, we assume that the number
|
|
* of subdirectories in a node is equal to the number of links to the parent.
|
|
* The former skips all stat calls. The latter skips stat calls in any leaf
|
|
* directories and for any files after the subdirectories in the directory have
|
|
* been found, cutting the stat calls by about 2/3.
|
|
*/
|
|
static FTSENT *
|
|
fts_build(FTS *sp, int type)
|
|
{
|
|
struct dirent *dp;
|
|
FTSENT *p, *head;
|
|
size_t nitems;
|
|
FTSENT *cur, *tail;
|
|
DIR *dirp;
|
|
void *oldaddr;
|
|
size_t dnamlen;
|
|
int cderrno, descend, level, nlinks, saved_errno, nostat, doadjust;
|
|
size_t len, maxlen;
|
|
#ifdef FTS_WHITEOUT
|
|
int oflag;
|
|
#endif
|
|
char *cp = NULL; /* pacify gcc */
|
|
|
|
_DIAGASSERT(sp != NULL);
|
|
|
|
/* Set current node pointer. */
|
|
cur = sp->fts_cur;
|
|
|
|
/*
|
|
* Open the directory for reading. If this fails, we're done.
|
|
* If being called from fts_read, set the fts_info field.
|
|
*/
|
|
#if 0 /* def FTS_WHITEOUT */
|
|
if (ISSET(FTS_WHITEOUT))
|
|
oflag = DTF_NODUP|DTF_REWIND;
|
|
else
|
|
oflag = DTF_HIDEW|DTF_NODUP|DTF_REWIND;
|
|
#else
|
|
#define __opendir2(path, flag) opendir(path)
|
|
#endif
|
|
if ((dirp = __opendir2(cur->fts_accpath, oflag)) == NULL) {
|
|
if (type == BREAD) {
|
|
cur->fts_info = FTS_DNR;
|
|
cur->fts_errno = errno;
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Nlinks is the number of possible entries of type directory in the
|
|
* directory if we're cheating on stat calls, 0 if we're not doing
|
|
* any stat calls at all, -1 if we're doing stats on everything.
|
|
*/
|
|
if (type == BNAMES) {
|
|
nlinks = 0;
|
|
nostat = 1;
|
|
} else if (ISSET(FTS_NOSTAT) && ISSET(FTS_PHYSICAL)) {
|
|
nlinks = cur->fts_nlink - (ISSET(FTS_SEEDOT) ? 0 : 2);
|
|
nostat = 1;
|
|
} else {
|
|
nlinks = -1;
|
|
nostat = 0;
|
|
}
|
|
|
|
#ifdef notdef
|
|
(void)printf("nlinks == %d (cur: %d)\n", nlinks, cur->fts_nlink);
|
|
(void)printf("NOSTAT %d PHYSICAL %d SEEDOT %d\n",
|
|
ISSET(FTS_NOSTAT), ISSET(FTS_PHYSICAL), ISSET(FTS_SEEDOT));
|
|
#endif
|
|
/*
|
|
* If we're going to need to stat anything or we want to descend
|
|
* and stay in the directory, chdir. If this fails we keep going,
|
|
* but set a flag so we don't chdir after the post-order visit.
|
|
* We won't be able to stat anything, but we can still return the
|
|
* names themselves. Note, that since fts_read won't be able to
|
|
* chdir into the directory, it will have to return different path
|
|
* names than before, i.e. "a/b" instead of "b". Since the node
|
|
* has already been visited in pre-order, have to wait until the
|
|
* post-order visit to return the error. There is a special case
|
|
* here, if there was nothing to stat then it's not an error to
|
|
* not be able to stat. This is all fairly nasty. If a program
|
|
* needed sorted entries or stat information, they had better be
|
|
* checking FTS_NS on the returned nodes.
|
|
*/
|
|
cderrno = 0;
|
|
if (nlinks || type == BREAD) {
|
|
if (fts_safe_changedir(sp, cur, dirfd(dirp), NULL)) {
|
|
if (nlinks && type == BREAD)
|
|
cur->fts_errno = errno;
|
|
cur->fts_flags |= FTS_DONTCHDIR;
|
|
descend = 0;
|
|
cderrno = errno;
|
|
} else
|
|
descend = 1;
|
|
} else
|
|
descend = 0;
|
|
|
|
/*
|
|
* Figure out the max file name length that can be stored in the
|
|
* current path -- the inner loop allocates more path as necessary.
|
|
* We really wouldn't have to do the maxlen calculations here, we
|
|
* could do them in fts_read before returning the path, but it's a
|
|
* lot easier here since the length is part of the dirent structure.
|
|
*
|
|
* If not changing directories set a pointer so that can just append
|
|
* each new name into the path.
|
|
*/
|
|
len = NAPPEND(cur);
|
|
if (ISSET(FTS_NOCHDIR)) {
|
|
cp = sp->fts_path + len;
|
|
*cp++ = '/';
|
|
}
|
|
len++;
|
|
maxlen = sp->fts_pathlen - len;
|
|
|
|
#if defined(__FTS_COMPAT_LEVEL)
|
|
if (cur->fts_level == SHRT_MAX) {
|
|
(void)closedir(dirp);
|
|
cur->fts_info = FTS_ERR;
|
|
SET(FTS_STOP);
|
|
errno = ENAMETOOLONG;
|
|
return (NULL);
|
|
}
|
|
#endif
|
|
|
|
level = cur->fts_level + 1;
|
|
|
|
/* Read the directory, attaching each entry to the `link' pointer. */
|
|
doadjust = 0;
|
|
for (head = tail = NULL, nitems = 0; (dp = readdir(dirp)) != NULL;) {
|
|
|
|
if (!ISSET(FTS_SEEDOT) && ISDOT(dp->d_name))
|
|
continue;
|
|
|
|
#if defined(HAVE_STRUCT_DIRENT_D_NAMLEN)
|
|
dnamlen = dp->d_namlen;
|
|
#else
|
|
dnamlen = strlen(dp->d_name);
|
|
#endif
|
|
if ((p = fts_alloc(sp, dp->d_name, dnamlen)) == NULL)
|
|
goto mem1;
|
|
if (dnamlen >= maxlen) { /* include space for NUL */
|
|
oldaddr = sp->fts_path;
|
|
if (fts_palloc(sp, dnamlen + len + 1)) {
|
|
/*
|
|
* No more memory for path or structures. Save
|
|
* errno, free up the current structure and the
|
|
* structures already allocated.
|
|
*/
|
|
mem1: saved_errno = errno;
|
|
if (p)
|
|
fts_free(p);
|
|
fts_lfree(head);
|
|
(void)closedir(dirp);
|
|
errno = saved_errno;
|
|
cur->fts_info = FTS_ERR;
|
|
SET(FTS_STOP);
|
|
return (NULL);
|
|
}
|
|
/* Did realloc() change the pointer? */
|
|
if (oldaddr != sp->fts_path) {
|
|
doadjust = 1;
|
|
if (ISSET(FTS_NOCHDIR))
|
|
cp = sp->fts_path + len;
|
|
}
|
|
maxlen = sp->fts_pathlen - len;
|
|
}
|
|
|
|
#if defined(__FTS_COMPAT_LENGTH)
|
|
if (len + dnamlen >= USHRT_MAX) {
|
|
/*
|
|
* In an FTSENT, fts_pathlen is an unsigned short
|
|
* so it is possible to wraparound here.
|
|
* If we do, free up the current structure and the
|
|
* structures already allocated, then error out
|
|
* with ENAMETOOLONG.
|
|
*/
|
|
fts_free(p);
|
|
fts_lfree(head);
|
|
(void)closedir(dirp);
|
|
cur->fts_info = FTS_ERR;
|
|
SET(FTS_STOP);
|
|
errno = ENAMETOOLONG;
|
|
return (NULL);
|
|
}
|
|
#endif
|
|
p->fts_level = level;
|
|
p->fts_pathlen = ftsent_pathlen_truncate(len + dnamlen);
|
|
p->fts_parent = sp->fts_cur;
|
|
|
|
#ifdef FTS_WHITEOUT
|
|
if (dp->d_type == DT_WHT)
|
|
p->fts_flags |= FTS_ISW;
|
|
#endif
|
|
|
|
if (cderrno) {
|
|
if (nlinks) {
|
|
p->fts_info = FTS_NS;
|
|
p->fts_errno = cderrno;
|
|
} else
|
|
p->fts_info = FTS_NSOK;
|
|
p->fts_accpath = cur->fts_accpath;
|
|
} else if (nlinks == 0
|
|
#ifdef DT_DIR
|
|
|| (nostat &&
|
|
dp->d_type != DT_DIR && dp->d_type != DT_UNKNOWN)
|
|
#endif
|
|
) {
|
|
p->fts_accpath =
|
|
ISSET(FTS_NOCHDIR) ? p->fts_path : p->fts_name;
|
|
p->fts_info = FTS_NSOK;
|
|
} else {
|
|
/* Build a file name for fts_stat to stat. */
|
|
if (ISSET(FTS_NOCHDIR)) {
|
|
p->fts_accpath = p->fts_path;
|
|
memmove(cp, p->fts_name,
|
|
(size_t)(p->fts_namelen + 1));
|
|
} else
|
|
p->fts_accpath = p->fts_name;
|
|
/* Stat it. */
|
|
p->fts_info = fts_stat(sp, p, 0);
|
|
|
|
/* Decrement link count if applicable. */
|
|
if (nlinks > 0 && (p->fts_info == FTS_D ||
|
|
p->fts_info == FTS_DC || p->fts_info == FTS_DOT))
|
|
--nlinks;
|
|
}
|
|
|
|
/* We walk in directory order so "ls -f" doesn't get upset. */
|
|
p->fts_link = NULL;
|
|
if (head == NULL)
|
|
head = tail = p;
|
|
else {
|
|
tail->fts_link = p;
|
|
tail = p;
|
|
}
|
|
++nitems;
|
|
}
|
|
(void)closedir(dirp);
|
|
|
|
/*
|
|
* If had to realloc the path, adjust the addresses for the rest
|
|
* of the tree.
|
|
*/
|
|
if (doadjust)
|
|
fts_padjust(sp, head);
|
|
|
|
/*
|
|
* If not changing directories, reset the path back to original
|
|
* state.
|
|
*/
|
|
if (ISSET(FTS_NOCHDIR)) {
|
|
if (len == sp->fts_pathlen || nitems == 0)
|
|
--cp;
|
|
*cp = '\0';
|
|
}
|
|
|
|
/*
|
|
* If descended after called from fts_children or after called from
|
|
* fts_read and nothing found, get back. At the root level we use
|
|
* the saved fd; if one of fts_open()'s arguments is a relative path
|
|
* to an empty directory, we wind up here with no other way back. If
|
|
* can't get back, we're done.
|
|
*/
|
|
if (descend && (type == BCHILD || !nitems) &&
|
|
(cur->fts_level == FTS_ROOTLEVEL ?
|
|
FCHDIR(sp, sp->fts_rfd) :
|
|
fts_safe_changedir(sp, cur->fts_parent, -1, ".."))) {
|
|
fts_lfree(head);
|
|
cur->fts_info = FTS_ERR;
|
|
SET(FTS_STOP);
|
|
return (NULL);
|
|
}
|
|
|
|
/* If didn't find anything, return NULL. */
|
|
if (!nitems) {
|
|
if (type == BREAD)
|
|
cur->fts_info = FTS_DP;
|
|
return (NULL);
|
|
}
|
|
|
|
/* Sort the entries. */
|
|
if (sp->fts_compar && nitems > 1)
|
|
head = fts_sort(sp, head, nitems);
|
|
return (head);
|
|
}
|
|
|
|
static unsigned short
|
|
fts_stat(FTS *sp, FTSENT *p, int follow)
|
|
{
|
|
FTSENT *t;
|
|
dev_t dev;
|
|
ino_t ino;
|
|
struct stat *sbp, sb;
|
|
int saved_errno;
|
|
|
|
_DIAGASSERT(sp != NULL);
|
|
_DIAGASSERT(p != NULL);
|
|
|
|
/* If user needs stat info, stat buffer already allocated. */
|
|
sbp = ISSET(FTS_NOSTAT) ? &sb : p->fts_statp;
|
|
|
|
#ifdef FTS_WHITEOUT
|
|
/* check for whiteout */
|
|
if (p->fts_flags & FTS_ISW) {
|
|
if (sbp != &sb) {
|
|
memset(sbp, '\0', sizeof (*sbp));
|
|
sbp->st_mode = S_IFWHT;
|
|
}
|
|
return (FTS_W);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* If doing a logical walk, or application requested FTS_FOLLOW, do
|
|
* a stat(2). If that fails, check for a non-existent symlink. If
|
|
* fail, set the errno from the stat call.
|
|
*/
|
|
if (ISSET(FTS_LOGICAL) || follow) {
|
|
if (stat(p->fts_accpath, sbp)) {
|
|
saved_errno = errno;
|
|
if (!lstat(p->fts_accpath, sbp)) {
|
|
errno = 0;
|
|
return (FTS_SLNONE);
|
|
}
|
|
p->fts_errno = saved_errno;
|
|
goto err;
|
|
}
|
|
} else if (lstat(p->fts_accpath, sbp)) {
|
|
p->fts_errno = errno;
|
|
err: memset(sbp, 0, sizeof(*sbp));
|
|
return (FTS_NS);
|
|
}
|
|
|
|
if (S_ISDIR(sbp->st_mode)) {
|
|
/*
|
|
* Set the device/inode. Used to find cycles and check for
|
|
* crossing mount points. Also remember the link count, used
|
|
* in fts_build to limit the number of stat calls. It is
|
|
* understood that these fields are only referenced if fts_info
|
|
* is set to FTS_D.
|
|
*/
|
|
dev = p->fts_dev = sbp->st_dev;
|
|
ino = p->fts_ino = sbp->st_ino;
|
|
p->fts_nlink = sbp->st_nlink;
|
|
|
|
if (ISDOT(p->fts_name))
|
|
return (FTS_DOT);
|
|
|
|
/*
|
|
* Cycle detection is done by brute force when the directory
|
|
* is first encountered. If the tree gets deep enough or the
|
|
* number of symbolic links to directories is high enough,
|
|
* something faster might be worthwhile.
|
|
*/
|
|
for (t = p->fts_parent;
|
|
t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent)
|
|
if (ino == t->fts_ino && dev == t->fts_dev) {
|
|
p->fts_cycle = t;
|
|
return (FTS_DC);
|
|
}
|
|
return (FTS_D);
|
|
}
|
|
if (S_ISLNK(sbp->st_mode))
|
|
return (FTS_SL);
|
|
if (S_ISREG(sbp->st_mode))
|
|
return (FTS_F);
|
|
return (FTS_DEFAULT);
|
|
}
|
|
|
|
static FTSENT *
|
|
fts_sort(FTS *sp, FTSENT *head, size_t nitems)
|
|
{
|
|
FTSENT **ap, *p;
|
|
|
|
_DIAGASSERT(sp != NULL);
|
|
_DIAGASSERT(head != NULL);
|
|
|
|
/*
|
|
* Construct an array of pointers to the structures and call qsort(3).
|
|
* Reassemble the array in the order returned by qsort. If unable to
|
|
* sort for memory reasons, return the directory entries in their
|
|
* current order. Allocate enough space for the current needs plus
|
|
* 40 so don't realloc one entry at a time.
|
|
*/
|
|
if (nitems > sp->fts_nitems) {
|
|
FTSENT **new;
|
|
|
|
new = realloc(sp->fts_array, sizeof(FTSENT *) * (nitems + 40));
|
|
if (new == 0)
|
|
return (head);
|
|
sp->fts_array = new;
|
|
sp->fts_nitems = fts_nitems_truncate(nitems + 40);
|
|
}
|
|
for (ap = sp->fts_array, p = head; p; p = p->fts_link)
|
|
*ap++ = p;
|
|
qsort((void *)sp->fts_array, nitems, sizeof(FTSENT *),
|
|
(int (*)(const void *, const void *))sp->fts_compar);
|
|
for (head = *(ap = sp->fts_array); --nitems; ++ap)
|
|
ap[0]->fts_link = ap[1];
|
|
ap[0]->fts_link = NULL;
|
|
return (head);
|
|
}
|
|
|
|
static FTSENT *
|
|
fts_alloc(FTS *sp, const char *name, size_t namelen)
|
|
{
|
|
FTSENT *p;
|
|
#if defined(FTS_ALLOC_ALIGNED)
|
|
size_t len;
|
|
#endif
|
|
|
|
_DIAGASSERT(sp != NULL);
|
|
_DIAGASSERT(name != NULL);
|
|
|
|
#if defined(FTS_ALLOC_ALIGNED)
|
|
/*
|
|
* The file name is a variable length array and no stat structure is
|
|
* necessary if the user has set the nostat bit. Allocate the FTSENT
|
|
* structure, the file name and the stat structure in one chunk, but
|
|
* be careful that the stat structure is reasonably aligned. Since the
|
|
* fts_name field is declared to be of size 1, the fts_name pointer is
|
|
* namelen + 2 before the first possible address of the stat structure.
|
|
*/
|
|
len = sizeof(FTSENT) + namelen;
|
|
if (!ISSET(FTS_NOSTAT))
|
|
len += sizeof(*(p->fts_statp)) + ALIGNBYTES;
|
|
if ((p = malloc(len)) == NULL)
|
|
return (NULL);
|
|
|
|
if (!ISSET(FTS_NOSTAT))
|
|
p->fts_statp = (struct stat *)ALIGN(
|
|
(unsigned long)(p->fts_name + namelen + 2));
|
|
#else
|
|
if ((p = malloc(sizeof(FTSENT) + namelen)) == NULL)
|
|
return (NULL);
|
|
|
|
if (!ISSET(FTS_NOSTAT))
|
|
if ((p->fts_statp = malloc(sizeof(*(p->fts_statp)))) == NULL) {
|
|
free(p);
|
|
return (NULL);
|
|
}
|
|
#endif
|
|
|
|
if (ISSET(FTS_NOSTAT))
|
|
p->fts_statp = NULL;
|
|
|
|
/* Copy the name plus the trailing NULL. */
|
|
memmove(p->fts_name, name, namelen + 1);
|
|
|
|
p->fts_namelen = ftsent_namelen_truncate(namelen);
|
|
p->fts_path = sp->fts_path;
|
|
p->fts_errno = 0;
|
|
p->fts_flags = 0;
|
|
p->fts_instr = FTS_NOINSTR;
|
|
p->fts_number = 0;
|
|
p->fts_pointer = NULL;
|
|
return (p);
|
|
}
|
|
|
|
static void
|
|
fts_free(FTSENT *p)
|
|
{
|
|
#if !defined(FTS_ALLOC_ALIGNED)
|
|
if (p->fts_statp)
|
|
free(p->fts_statp);
|
|
#endif
|
|
free(p);
|
|
}
|
|
|
|
static void
|
|
fts_lfree(FTSENT *head)
|
|
{
|
|
FTSENT *p;
|
|
|
|
/* XXX: head may be NULL ? */
|
|
|
|
/* Free a linked list of structures. */
|
|
while ((p = head) != NULL) {
|
|
head = head->fts_link;
|
|
fts_free(p);
|
|
}
|
|
}
|
|
|
|
static size_t
|
|
fts_pow2(size_t x)
|
|
{
|
|
|
|
x--;
|
|
x |= x>>1;
|
|
x |= x>>2;
|
|
x |= x>>4;
|
|
x |= x>>8;
|
|
x |= x>>16;
|
|
#if LONG_BIT > 32
|
|
x |= x>>32;
|
|
#endif
|
|
#if LONG_BIT > 64
|
|
x |= x>>64;
|
|
#endif
|
|
x++;
|
|
return (x);
|
|
}
|
|
|
|
/*
|
|
* Allow essentially unlimited paths; find, rm, ls should all work on any tree.
|
|
* Most systems will allow creation of paths much longer than MAXPATHLEN, even
|
|
* though the kernel won't resolve them. Round up the new size to a power of 2,
|
|
* so we don't realloc the path 2 bytes at a time.
|
|
*/
|
|
static int
|
|
fts_palloc(FTS *sp, size_t size)
|
|
{
|
|
char *new;
|
|
|
|
_DIAGASSERT(sp != NULL);
|
|
|
|
#ifdef __FTS_COMPAT_LENGTH
|
|
/* Protect against fts_pathlen overflow. */
|
|
if (size > USHRT_MAX + 1) {
|
|
errno = ENAMETOOLONG;
|
|
return (1);
|
|
}
|
|
#endif
|
|
size = fts_pow2(size);
|
|
new = realloc(sp->fts_path, size);
|
|
if (new == 0)
|
|
return (1);
|
|
sp->fts_path = new;
|
|
sp->fts_pathlen = fts_pathlen_truncate(size);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* When the path is realloc'd, have to fix all of the pointers in structures
|
|
* already returned.
|
|
*/
|
|
static void
|
|
fts_padjust(FTS *sp, FTSENT *head)
|
|
{
|
|
FTSENT *p;
|
|
char *addr;
|
|
|
|
_DIAGASSERT(sp != NULL);
|
|
|
|
#define ADJUST(p) do { \
|
|
if ((p)->fts_accpath != (p)->fts_name) \
|
|
(p)->fts_accpath = \
|
|
addr + ((p)->fts_accpath - (p)->fts_path); \
|
|
(p)->fts_path = addr; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
addr = sp->fts_path;
|
|
|
|
/* Adjust the current set of children. */
|
|
for (p = sp->fts_child; p; p = p->fts_link)
|
|
ADJUST(p);
|
|
|
|
/* Adjust the rest of the tree, including the current level. */
|
|
for (p = head; p->fts_level >= FTS_ROOTLEVEL;) {
|
|
ADJUST(p);
|
|
p = p->fts_link ? p->fts_link : p->fts_parent;
|
|
}
|
|
}
|
|
|
|
static size_t
|
|
fts_maxarglen(char * const *argv)
|
|
{
|
|
size_t len, max;
|
|
|
|
_DIAGASSERT(argv != NULL);
|
|
|
|
for (max = 0; *argv; ++argv)
|
|
if ((len = strlen(*argv)) > max)
|
|
max = len;
|
|
return (max + 1);
|
|
}
|
|
|
|
/*
|
|
* Change to dir specified by fd or p->fts_accpath without getting
|
|
* tricked by someone changing the world out from underneath us.
|
|
* Assumes p->fts_dev and p->fts_ino are filled in.
|
|
*/
|
|
static int
|
|
fts_safe_changedir(const FTS *sp, const FTSENT *p, int fd, const char *path)
|
|
{
|
|
int oldfd = fd, ret = -1;
|
|
struct stat sb;
|
|
|
|
if (ISSET(FTS_NOCHDIR))
|
|
return 0;
|
|
|
|
if (oldfd < 0 && (path == NULL || (fd = open(path, O_RDONLY)) == -1))
|
|
return -1;
|
|
|
|
if (fstat(fd, &sb) == -1)
|
|
goto bail;
|
|
|
|
if (sb.st_ino != p->fts_ino || sb.st_dev != p->fts_dev) {
|
|
errno = ENOENT;
|
|
goto bail;
|
|
}
|
|
|
|
ret = fchdir(fd);
|
|
|
|
bail:
|
|
if (oldfd < 0) {
|
|
int save_errno = errno;
|
|
(void)close(fd);
|
|
errno = save_errno;
|
|
}
|
|
return ret;
|
|
}
|