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@@ -0,0 +1,621 @@
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+/* File tree walker functions.
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+ Copyright (C) 1996-2001, 2002, 2003 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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+
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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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+
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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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+
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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, write to the Free
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+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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+ 02111-1307 USA. */
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+
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+#define _GNU_SOURCE
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+#include <features.h>
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+
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+/* If Large file support is enabled, transparently remap
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+ * things to use the 64-bit interfaces */
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+#ifdef __UCLIBC_HAS_LFS__
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+#if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS != 64
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+#undef _FILE_OFFSET_BITS
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+#define _FILE_OFFSET_BITS 64
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+#endif
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+#ifndef __USE_LARGEFILE64
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+# define __USE_LARGEFILE64 1
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+#endif
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+#ifndef __USE_FILE_OFFSET64
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+# define __USE_FILE_OFFSET64 1
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+#endif
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+#endif
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+
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+#include <alloca.h>
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+#include <errno.h>
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+#include <ftw.h>
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+#include <limits.h>
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+#include <search.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 <sys/param.h>
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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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+
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+/* We define PATH_MAX if the system does not provide a definition.
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+ This does not artificially limit any operation. PATH_MAX is simply
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+ used as a guesstimate for the expected maximal path length.
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+ Buffers will be enlarged if necessary. */
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+#ifndef PATH_MAX
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+# define PATH_MAX 1024
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+#endif
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+
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+struct dir_data
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+{
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+ DIR *stream;
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+ char *content;
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+};
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+
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+struct known_object
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+{
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+ dev_t dev;
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+ ino_t ino;
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+};
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+
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+struct ftw_data
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+{
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+ /* Array with pointers to open directory streams. */
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+ struct dir_data **dirstreams;
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+ size_t actdir;
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+ size_t maxdir;
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+
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+ /* Buffer containing name of currently processed object. */
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+ char *dirbuf;
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+ size_t dirbufsize;
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+
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+ /* Passed as fourth argument to `nftw' callback. The `base' member
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+ tracks the content of the `dirbuf'. */
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+ struct FTW ftw;
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+
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+ /* Flags passed to `nftw' function. 0 for `ftw'. */
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+ int flags;
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+
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+ /* Conversion array for flag values. It is the identity mapping for
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+ `nftw' calls, otherwise it maps the values to those known by
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+ `ftw'. */
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+ const int *cvt_arr;
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+
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+ /* Callback function. We always use the `nftw' form. */
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+ __nftw_func_t func;
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+
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+ /* Device of starting point. Needed for FTW_MOUNT. */
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+ dev_t dev;
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+
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+ /* Data structure for keeping fingerprints of already processed
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+ object. This is needed when not using FTW_PHYS. */
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+ void *known_objects;
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+};
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+
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+
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+/* Internally we use the FTW_* constants used for `nftw'. When invoked
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+ as `ftw', map each flag to the subset of values used by `ftw'. */
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+static const int nftw_arr[] =
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+{
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+ FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_SL, FTW_DP, FTW_SLN
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+};
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+
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+static const int ftw_arr[] =
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+{
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+ FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_F, FTW_D, FTW_NS
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+};
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+
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+/* Forward declarations of local functions. */
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+static int ftw_dir (struct ftw_data *data, struct stat *st) internal_function;
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+
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+
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+static int
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+object_compare (const void *p1, const void *p2)
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+{
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+ /* We don't need a sophisticated and useful comparison. We are only
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+ interested in equality. However, we must be careful not to
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+ accidentally compare `holes' in the structure. */
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+ const struct known_object *kp1 = p1, *kp2 = p2;
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+ int cmp1;
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+ cmp1 = (kp1->ino > kp2->ino) - (kp1->ino < kp2->ino);
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+ if (cmp1 != 0)
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+ return cmp1;
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+ return (kp1->dev > kp2->dev) - (kp1->dev < kp2->dev);
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+}
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+
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+
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+static inline int
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+add_object (struct ftw_data *data, struct stat *st)
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+{
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+ struct known_object *newp = malloc (sizeof (struct known_object));
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+ if (newp == NULL)
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+ return -1;
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+ newp->dev = st->st_dev;
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+ newp->ino = st->st_ino;
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+ return tsearch (newp, &data->known_objects, object_compare) ? 0 : -1;
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+}
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+
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+
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+static inline int
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+find_object (struct ftw_data *data, struct stat *st)
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+{
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+ struct known_object obj;
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+ obj.dev = st->st_dev;
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+ obj.ino = st->st_ino;
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+ return tfind (&obj, &data->known_objects, object_compare) != NULL;
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+}
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+
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+
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+static inline int
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+__attribute ((always_inline))
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+open_dir_stream (struct ftw_data *data, struct dir_data *dirp)
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+{
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+ int result = 0;
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+
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+ if (data->dirstreams[data->actdir] != NULL)
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+ {
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+ /* Oh, oh. We must close this stream. Get all remaining
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+ entries and store them as a list in the `content' member of
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+ the `struct dir_data' variable. */
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+ size_t bufsize = 1024;
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+ char *buf = malloc (bufsize);
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+
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+ if (buf == NULL)
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+ result = -1;
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+ else
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+ {
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+ DIR *st = data->dirstreams[data->actdir]->stream;
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+ struct dirent *d;
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+ size_t actsize = 0;
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+
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+ while ((d = readdir (st)) != NULL)
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+ {
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+ size_t this_len = _D_EXACT_NAMLEN (d);
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+ if (actsize + this_len + 2 >= bufsize)
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+ {
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+ char *newp;
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+ bufsize += MAX (1024, 2 * this_len);
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+ newp = (char *) realloc (buf, bufsize);
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+ if (newp == NULL)
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+ {
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+ /* No more memory. */
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+ int save_err = errno;
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+ free (buf);
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+ __set_errno (save_err);
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+ result = -1;
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+ break;
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+ }
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+ buf = newp;
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+ }
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+
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+ *((char *) mempcpy (buf + actsize, d->d_name, this_len))
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+ = '\0';
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+ actsize += this_len + 1;
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+ }
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+
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+ /* Terminate the list with an additional NUL byte. */
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+ buf[actsize++] = '\0';
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+
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+ /* Shrink the buffer to what we actually need. */
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+ data->dirstreams[data->actdir]->content = realloc (buf, actsize);
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+ if (data->dirstreams[data->actdir]->content == NULL)
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+ {
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+ int save_err = errno;
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+ free (buf);
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+ __set_errno (save_err);
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+ result = -1;
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+ }
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+ else
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+ {
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+ closedir (st);
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+ data->dirstreams[data->actdir]->stream = NULL;
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+ data->dirstreams[data->actdir] = NULL;
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+ }
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+ }
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+ }
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+
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+ /* Open the new stream. */
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+ if (result == 0)
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+ {
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+ const char *name = ((data->flags & FTW_CHDIR)
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+ ? data->dirbuf + data->ftw.base: data->dirbuf);
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+ assert (data->dirstreams[data->actdir] == NULL);
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+
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+ dirp->stream = opendir (name);
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+ if (dirp->stream == NULL)
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+ result = -1;
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+ else
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+ {
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+ dirp->content = NULL;
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+ data->dirstreams[data->actdir] = dirp;
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+
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+ if (++data->actdir == data->maxdir)
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+ data->actdir = 0;
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+ }
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+ }
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+
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+ return result;
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+}
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+
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+
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+static int
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+internal_function
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+process_entry (struct ftw_data *data, struct dir_data *dir, const char *name, size_t namlen)
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+{
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+ struct stat st;
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+ int result = 0;
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+ int flag = 0;
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+ size_t new_buflen;
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+
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+ if (name[0] == '.' && (name[1] == '\0'
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+ || (name[1] == '.' && name[2] == '\0')))
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+ /* Don't process the "." and ".." entries. */
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+ return 0;
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+
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+ new_buflen = data->ftw.base + namlen + 2;
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+ if (data->dirbufsize < new_buflen)
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+ {
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+ /* Enlarge the buffer. */
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+ char *newp;
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+
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+ data->dirbufsize = 2 * new_buflen;
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+ newp = (char *) realloc (data->dirbuf, data->dirbufsize);
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+ if (newp == NULL)
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+ return -1;
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+ data->dirbuf = newp;
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+ }
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+
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+ *((char *) mempcpy (data->dirbuf + data->ftw.base, name, namlen)) = '\0';
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+
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+ if ((data->flags & FTW_CHDIR) == 0)
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+ name = data->dirbuf;
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+
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+ if (((data->flags & FTW_PHYS)
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+ ? lstat (name, &st)
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+ : stat (name, &st)) < 0)
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+ {
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+ if (errno != EACCES && errno != ENOENT)
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+ result = -1;
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+ else if (!(data->flags & FTW_PHYS)
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+ && lstat (name, &st) == 0
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+ && S_ISLNK (st.st_mode))
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+ flag = FTW_SLN;
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+ else
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+ flag = FTW_NS;
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+ }
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+ else
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+ {
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+ if (S_ISDIR (st.st_mode))
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+ flag = FTW_D;
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+ else if (S_ISLNK (st.st_mode))
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+ flag = FTW_SL;
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+ else
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+ flag = FTW_F;
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+ }
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+
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+ if (result == 0
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+ && (flag == FTW_NS
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+ || !(data->flags & FTW_MOUNT) || st.st_dev == data->dev))
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+ {
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+ if (flag == FTW_D)
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+ {
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+ if ((data->flags & FTW_PHYS)
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+ || (!find_object (data, &st)
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+ /* Remember the object. */
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+ && (result = add_object (data, &st)) == 0))
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+ {
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+ result = ftw_dir (data, &st);
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+
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+ if (result == 0 && (data->flags & FTW_CHDIR))
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+ {
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+ /* Change back to the parent directory. */
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+ int done = 0;
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+ if (dir->stream != NULL)
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+ if (fchdir (dirfd (dir->stream)) == 0)
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+ done = 1;
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+
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+ if (!done)
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+ {
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+ if (data->ftw.base == 1)
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+ {
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+ if (chdir ("/") < 0)
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+ result = -1;
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+ }
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+ else
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+ if (chdir ("..") < 0)
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+ result = -1;
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+ }
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+ }
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+ }
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+ }
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+ else
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+ result = (*data->func) (data->dirbuf, &st, data->cvt_arr[flag],
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+ &data->ftw);
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+ }
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+
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+ return result;
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+}
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+
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+static int
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+internal_function
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+ftw_dir (struct ftw_data *data, struct stat *st)
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+{
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+ struct dir_data dir;
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+ struct dirent *d;
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+ int previous_base = data->ftw.base;
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+ int result;
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+ char *startp;
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+
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+ /* Open the stream for this directory. This might require that
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+ another stream has to be closed. */
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+ result = open_dir_stream (data, &dir);
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+ if (result != 0)
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+ {
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+ if (errno == EACCES)
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+ /* We cannot read the directory. Signal this with a special flag. */
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+ result = (*data->func) (data->dirbuf, st, FTW_DNR, &data->ftw);
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+
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+ return result;
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+ }
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+
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+ /* First, report the directory (if not depth-first). */
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+ if (!(data->flags & FTW_DEPTH))
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+ {
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+ result = (*data->func) (data->dirbuf, st, FTW_D, &data->ftw);
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+ if (result != 0)
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+ return result;
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+ }
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+
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+ /* If necessary, change to this directory. */
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+ if (data->flags & FTW_CHDIR)
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+ {
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+ if (fchdir (dirfd (dir.stream)) < 0)
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+ {
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+ int save_err = errno;
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+ closedir (dir.stream);
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+ __set_errno (save_err);
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+
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+ if (data->actdir-- == 0)
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+ data->actdir = data->maxdir - 1;
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+ data->dirstreams[data->actdir] = NULL;
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+
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+ return -1;
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+ }
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+ }
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+
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+ /* Next, update the `struct FTW' information. */
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+ ++data->ftw.level;
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+ startp = strchr (data->dirbuf, '\0');
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+ /* There always must be a directory name. */
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+ assert (startp != data->dirbuf);
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+ if (startp[-1] != '/')
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+ *startp++ = '/';
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+ data->ftw.base = startp - data->dirbuf;
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+
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+ while (dir.stream != NULL && (d = readdir (dir.stream)) != NULL)
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+ {
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+ result = process_entry (data, &dir, d->d_name, _D_EXACT_NAMLEN (d));
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+ if (result != 0)
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+ break;
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+ }
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+
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+ if (dir.stream != NULL)
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+ {
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+ /* The stream is still open. I.e., we did not need more
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+ descriptors. Simply close the stream now. */
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+ int save_err = errno;
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+
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+ assert (dir.content == NULL);
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+
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+ closedir (dir.stream);
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+ __set_errno (save_err);
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+
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+ if (data->actdir-- == 0)
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+ data->actdir = data->maxdir - 1;
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|
|
+ data->dirstreams[data->actdir] = NULL;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ int save_err;
|
|
|
+ char *runp = dir.content;
|
|
|
+
|
|
|
+ while (result == 0 && *runp != '\0')
|
|
|
+ {
|
|
|
+ char *endp = strchr (runp, '\0');
|
|
|
+
|
|
|
+ result = process_entry (data, &dir, runp, endp - runp);
|
|
|
+
|
|
|
+ runp = endp + 1;
|
|
|
+ }
|
|
|
+
|
|
|
+ save_err = errno;
|
|
|
+ free (dir.content);
|
|
|
+ __set_errno (save_err);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Prepare the return, revert the `struct FTW' information. */
|
|
|
+ data->dirbuf[data->ftw.base - 1] = '\0';
|
|
|
+ --data->ftw.level;
|
|
|
+ data->ftw.base = previous_base;
|
|
|
+
|
|
|
+ /* Finally, if we process depth-first report the directory. */
|
|
|
+ if (result == 0 && (data->flags & FTW_DEPTH))
|
|
|
+ result = (*data->func) (data->dirbuf, st, FTW_DP, &data->ftw);
|
|
|
+
|
|
|
+ return result;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+static int
|
|
|
+internal_function
|
|
|
+ftw_startup (const char *dir, int is_nftw, void *func, int descriptors, int flags)
|
|
|
+{
|
|
|
+ struct ftw_data data;
|
|
|
+ struct stat st;
|
|
|
+ int result = 0;
|
|
|
+ int save_err;
|
|
|
+ char *cwd = NULL;
|
|
|
+ char *cp;
|
|
|
+
|
|
|
+ /* First make sure the parameters are reasonable. */
|
|
|
+ if (dir[0] == '\0')
|
|
|
+ {
|
|
|
+ __set_errno (ENOENT);
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+
|
|
|
+ data.maxdir = descriptors < 1 ? 1 : descriptors;
|
|
|
+ data.actdir = 0;
|
|
|
+ data.dirstreams = (struct dir_data **) alloca (data.maxdir
|
|
|
+ * sizeof (struct dir_data *));
|
|
|
+ memset (data.dirstreams, '\0', data.maxdir * sizeof (struct dir_data *));
|
|
|
+
|
|
|
+ /* PATH_MAX is always defined when we get here. */
|
|
|
+ data.dirbufsize = MAX (2 * strlen (dir), PATH_MAX);
|
|
|
+ data.dirbuf = (char *) malloc (data.dirbufsize);
|
|
|
+ if (data.dirbuf == NULL)
|
|
|
+ return -1;
|
|
|
+ cp = __stpcpy (data.dirbuf, dir);
|
|
|
+ /* Strip trailing slashes. */
|
|
|
+ while (cp > data.dirbuf + 1 && cp[-1] == '/')
|
|
|
+ --cp;
|
|
|
+ *cp = '\0';
|
|
|
+
|
|
|
+ data.ftw.level = 0;
|
|
|
+
|
|
|
+ /* Find basename. */
|
|
|
+ while (cp > data.dirbuf && cp[-1] != '/')
|
|
|
+ --cp;
|
|
|
+ data.ftw.base = cp - data.dirbuf;
|
|
|
+
|
|
|
+ data.flags = flags;
|
|
|
+
|
|
|
+ /* This assignment might seem to be strange but it is what we want.
|
|
|
+ The trick is that the first three arguments to the `ftw' and
|
|
|
+ `nftw' callback functions are equal. Therefore we can call in
|
|
|
+ every case the callback using the format of the `nftw' version
|
|
|
+ and get the correct result since the stack layout for a function
|
|
|
+ call in C allows this. */
|
|
|
+ data.func = (__nftw_func_t) func;
|
|
|
+
|
|
|
+ /* Since we internally use the complete set of FTW_* values we need
|
|
|
+ to reduce the value range before calling a `ftw' callback. */
|
|
|
+ data.cvt_arr = is_nftw ? nftw_arr : ftw_arr;
|
|
|
+
|
|
|
+ /* No object known so far. */
|
|
|
+ data.known_objects = NULL;
|
|
|
+
|
|
|
+ /* Now go to the directory containing the initial file/directory. */
|
|
|
+ if (flags & FTW_CHDIR)
|
|
|
+ {
|
|
|
+ /* GNU extension ahead. */
|
|
|
+ cwd = getcwd (NULL, 0);
|
|
|
+ if (cwd == NULL)
|
|
|
+ result = -1;
|
|
|
+ else if (data.ftw.base > 0)
|
|
|
+ {
|
|
|
+ /* Change to the directory the file is in. In data.dirbuf
|
|
|
+ we have a writable copy of the file name. Just NUL
|
|
|
+ terminate it for now and change the directory. */
|
|
|
+ if (data.ftw.base == 1)
|
|
|
+ /* I.e., the file is in the root directory. */
|
|
|
+ result = chdir ("/");
|
|
|
+ else
|
|
|
+ {
|
|
|
+ char ch = data.dirbuf[data.ftw.base - 1];
|
|
|
+ data.dirbuf[data.ftw.base - 1] = '\0';
|
|
|
+ result = chdir (data.dirbuf);
|
|
|
+ data.dirbuf[data.ftw.base - 1] = ch;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Get stat info for start directory. */
|
|
|
+ if (result == 0)
|
|
|
+ {
|
|
|
+ const char *name = ((data.flags & FTW_CHDIR)
|
|
|
+ ? data.dirbuf + data.ftw.base
|
|
|
+ : data.dirbuf);
|
|
|
+
|
|
|
+ if (((flags & FTW_PHYS)
|
|
|
+ ? lstat (name, &st)
|
|
|
+ : stat (name, &st)) < 0)
|
|
|
+ {
|
|
|
+ if (!(flags & FTW_PHYS)
|
|
|
+ && errno == ENOENT
|
|
|
+ && lstat (name, &st) == 0
|
|
|
+ && S_ISLNK (st.st_mode))
|
|
|
+ result = (*data.func) (data.dirbuf, &st, data.cvt_arr[FTW_SLN],
|
|
|
+ &data.ftw);
|
|
|
+ else
|
|
|
+ /* No need to call the callback since we cannot say anything
|
|
|
+ about the object. */
|
|
|
+ result = -1;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ if (S_ISDIR (st.st_mode))
|
|
|
+ {
|
|
|
+ /* Remember the device of the initial directory in case
|
|
|
+ FTW_MOUNT is given. */
|
|
|
+ data.dev = st.st_dev;
|
|
|
+
|
|
|
+ /* We know this directory now. */
|
|
|
+ if (!(flags & FTW_PHYS))
|
|
|
+ result = add_object (&data, &st);
|
|
|
+
|
|
|
+ if (result == 0)
|
|
|
+ result = ftw_dir (&data, &st);
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ int flag = S_ISLNK (st.st_mode) ? FTW_SL : FTW_F;
|
|
|
+
|
|
|
+ result = (*data.func) (data.dirbuf, &st, data.cvt_arr[flag],
|
|
|
+ &data.ftw);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Return to the start directory (if necessary). */
|
|
|
+ if (cwd != NULL)
|
|
|
+ {
|
|
|
+ int save_err = errno;
|
|
|
+ chdir (cwd);
|
|
|
+ free (cwd);
|
|
|
+ __set_errno (save_err);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Free all memory. */
|
|
|
+ save_err = errno;
|
|
|
+ tdestroy (data.known_objects, free);
|
|
|
+ free (data.dirbuf);
|
|
|
+ __set_errno (save_err);
|
|
|
+
|
|
|
+ return result;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+
|
|
|
+/* Entry points. */
|
|
|
+
|
|
|
+int ftw (const char *path, __ftw_func_t func, int descriptors)
|
|
|
+{
|
|
|
+ return ftw_startup (path, 0, func, descriptors, 0);
|
|
|
+}
|
|
|
+
|
|
|
+int nftw (const char *path, __nftw_func_t func, int descriptors, int flags)
|
|
|
+{
|
|
|
+ return ftw_startup (path, 1, func, descriptors, flags);
|
|
|
+}
|
Eric Andersen