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116 lines
4.8 KiB
C
116 lines
4.8 KiB
C
/*-
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* Copyright (c) 2003-2007 Tim Kientzle
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*-
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* A set of routines for traversing directory trees.
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* Similar in concept to the fts library, but with a few
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* important differences:
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* * Uses less memory. In particular, fts stores an entire directory
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* in memory at a time. This package only keeps enough subdirectory
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* information in memory to track the traversal. Information
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* about non-directories is discarded as soon as possible.
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* * Supports very deep logical traversals. The fts package
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* uses "non-chdir" approach for logical traversals. This
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* package does use a chdir approach for logical traversals
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* and can therefore handle pathnames much longer than
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* PATH_MAX.
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* * Supports deep physical traversals "out of the box."
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* Due to the memory optimizations above, there's no need to
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* limit dir names to 32k.
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*/
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#include <sys/stat.h>
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#include <stdio.h>
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struct tree;
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/* Initiate/terminate a tree traversal. */
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struct tree *tree_open(const char * /* pathname */);
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void tree_close(struct tree *);
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/*
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* tree_next() returns Zero if there is no next entry, non-zero if there is.
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* Note that directories are potentially visited three times. The first
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* time as "regular" file. If tree_descend() is invoked at that time,
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* the directory is added to a work list and will be visited two more
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* times: once just after descending into the directory and again
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* just after ascending back to the parent.
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*
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* TREE_ERROR is returned if the descent failed (because the
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* directory couldn't be opened, for instance). This is returned
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* instead of TREE_PREVISIT/TREE_POSTVISIT.
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*/
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#define TREE_REGULAR 1
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#define TREE_POSTDESCENT 2
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#define TREE_POSTASCENT 3
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#define TREE_ERROR_DIR -1
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int tree_next(struct tree *);
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int tree_errno(struct tree *);
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/*
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* Request that current entry be visited. If you invoke it on every
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* directory, you'll get a physical traversal. This is ignored if the
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* current entry isn't a directory or a link to a directory. So, if
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* you invoke this on every returned path, you'll get a full logical
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* traversal.
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*/
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void tree_descend(struct tree *);
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/*
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* Return information about the current entry.
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*/
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int tree_current_depth(struct tree *);
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/*
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* The current full pathname, length of the full pathname,
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* and a name that can be used to access the file.
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* Because tree does use chdir extensively, the access path is
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* almost never the same as the full current path.
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*/
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const char *tree_current_path(struct tree *);
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size_t tree_current_pathlen(struct tree *);
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const char *tree_current_access_path(struct tree *);
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/*
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* Request the lstat() or stat() data for the current path. Since the
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* tree package needs to do some of this anyway, and caches the
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* results, you should take advantage of it here if you need it rather
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* than make a redundant stat() or lstat() call of your own.
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*/
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const struct stat *tree_current_stat(struct tree *);
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const struct stat *tree_current_lstat(struct tree *);
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/* The following tests may use mechanisms much faster than stat()/lstat(). */
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/* "is_physical_dir" is equivalent to S_ISDIR(tree_current_lstat()->st_mode) */
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int tree_current_is_physical_dir(struct tree *);
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/* "is_physical_link" is equivalent to S_ISLNK(tree_current_lstat()->st_mode) */
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int tree_current_is_physical_link(struct tree *);
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/* "is_dir" is equivalent to S_ISDIR(tree_current_stat()->st_mode) */
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int tree_current_is_dir(struct tree *);
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/* For testing/debugging: Dump the internal status to the given filehandle. */
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void tree_dump(struct tree *, FILE *);
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