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virtdir.h revision 1.2 
      1 /* $NetBSD: virtdir.h,v 1.2 2017/11/26 03:06:24 christos Exp $ */
      2 
      3 /*
      4  * Copyright  2007 Alistair Crooks.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. The name of the author may not be used to endorse or promote
     15  *    products derived from this software without specific prior written
     16  *    permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     19  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
     24  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     26  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     27  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef VIRTDIR_H_
     32 #define VIRTDIR_H_	20070405
     33 
     34 #include <sys/types.h>
     35 #include <sys/stat.h>
     36 
     37 /* this struct keeps a note of all the info related to a virtual directory entry */
     38 typedef struct virt_dirent_t {
     39 	char		*name;		/* entry name - used as key */
     40 	size_t		 namelen;	/* length of name */
     41 	char		*d_name;	/* component in this directory */
     42 	char		*tgt;		/* any symlink target */
     43 	size_t		 tgtlen;	/* length of symlink target */
     44 	uint8_t		 type;		/* entry type - file, dir, lnk */
     45 	ino_t		 ino;		/* inode number */
     46 	uint16_t	 select;	/* selector */
     47 } virt_dirent_t;
     48 
     49 /* this defines the list of virtual directory entries,
     50    sorted in name alpha order */
     51 typedef struct virtdir_t {
     52 	uint32_t	 c;		/* count of entries */
     53 	uint32_t	 size;		/* size of allocated list */
     54 	virt_dirent_t	*v;		/* list */
     55 	char		*rootdir;	/* root directory of virtual fs */
     56 	struct stat	 file;		/* stat struct for file entries */
     57 	struct stat	 dir;		/* stat struct for dir entries */
     58 	struct stat	 lnk;		/* stat struct for symlinks */
     59 } virtdir_t;
     60 
     61 /* this struct is used to walk through directories */
     62 typedef struct VIRTDIR {
     63 	char		*dirname;	/* directory name */
     64 	size_t		 dirnamelen;	/* length of directory name */
     65 	virtdir_t	*tp;		/* the directory tree */
     66 	size_t		 i;		/* current offset in dir tree */
     67 } VIRTDIR;
     68 
     69 int virtdir_init(virtdir_t *, const char *, struct stat *, struct stat *, struct stat *);
     70 int virtdir_add(virtdir_t *, const char *, size_t, uint8_t, const char *, size_t, uint16_t);
     71 virt_dirent_t *virtdir_find(virtdir_t *, const char *, size_t);
     72 
     73 VIRTDIR *openvirtdir(virtdir_t *, const char *);
     74 virt_dirent_t *readvirtdir(VIRTDIR *);
     75 void closevirtdir(VIRTDIR *);
     76 
     77 off_t virtdir_offset(virtdir_t *, virt_dirent_t *);
     78 
     79 #endif
     80