Initial Revision

1 files changed, 142 insertions, 0 deletions

diff --git a/serverboot/dir.h b/serverboot/dir.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ * Copyright (c) 1982, 1986, 1989 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ *	@(#)dir.h	7.6 (Berkeley) 5/9/89
+ */
+
+#ifndef _BOOT_UFS_DIR_H_
+#define	_BOOT_UFS_DIR_H_
+
+/*
+ * A directory consists of some number of blocks of DIRBLKSIZ
+ * bytes, where DIRBLKSIZ is chosen such that it can be transferred
+ * to disk in a single atomic operation (e.g. 512 bytes on most machines).
+ *
+ * Each DIRBLKSIZ byte block contains some number of directory entry
+ * structures, which are of variable length.  Each directory entry has
+ * a struct direct at the front of it, containing its inode number,
+ * the length of the entry, and the length of the name contained in
+ * the entry.  These are followed by the name padded to a 4 byte boundary
+ * with null bytes.  All names are guaranteed null terminated.
+ * The maximum length of a name in a directory is MAXNAMLEN.
+ *
+ * The macro DIRSIZ(dp) gives the amount of space required to represent
+ * a directory entry.  Free space in a directory is represented by
+ * entries which have dp->d_reclen > DIRSIZ(dp).  All DIRBLKSIZ bytes
+ * in a directory block are claimed by the directory entries.  This
+ * usually results in the last entry in a directory having a large
+ * dp->d_reclen.  When entries are deleted from a directory, the
+ * space is returned to the previous entry in the same directory
+ * block by increasing its dp->d_reclen.  If the first entry of
+ * a directory block is free, then its dp->d_ino is set to 0.
+ * Entries other than the first in a directory do not normally have
+ * dp->d_ino set to 0.
+ */
+#define DIRBLKSIZ	DEV_BSIZE
+#define	MAXNAMLEN	255
+
+struct	direct {
+	u_int	d_ino;			/* inode number of entry */
+	u_short	d_reclen;		/* length of this record */
+	u_short	d_namlen;		/* length of string in d_name */
+	char	d_name[MAXNAMLEN + 1];	/* name with length <= MAXNAMLEN */
+};
+
+/*
+ * The DIRSIZ macro gives the minimum record length which will hold
+ * the directory entry.  This requires the amount of space in struct direct
+ * without the d_name field, plus enough space for the name with a terminating
+ * null byte (dp->d_namlen+1), rounded up to a 4 byte boundary.
+ */
+#undef DIRSIZ
+#define DIRSIZ(dp) \
+    ((sizeof (struct direct) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))
+
+#ifdef KERNEL
+/*
+ * Template for manipulating directories.
+ * Should use struct direct's, but the name field
+ * is MAXNAMLEN - 1, and this just won't do.
+ */
+struct dirtemplate {
+	u_int	dot_ino;
+	short	dot_reclen;
+	short	dot_namlen;
+	char	dot_name[4];		/* must be multiple of 4 */
+	u_int	dotdot_ino;
+	short	dotdot_reclen;
+	short	dotdot_namlen;
+	char	dotdot_name[4];		/* ditto */
+};
+#endif
+
+/*
+ * The following information should be obtained from <dirent.h>
+ * and is provided solely (and temporarily) for backward compatibility.
+ */
+#ifndef KERNEL
+#define d_fileno d_ino		/* compatibility with POSIX */
+#ifndef DEV_BSIZE
+#define	DEV_BSIZE	512
+#endif
+/*
+ * Definitions for library routines operating on directories.
+ */
+typedef struct _dirdesc {
+	int	dd_fd;
+	int	dd_loc;
+	int	dd_size;
+	char	dd_buf[DIRBLKSIZ];
+} DIR;
+
+#define dirfd(dirp)	((dirp)->dd_fd)
+
+#ifndef NULL
+#define NULL 0
+#endif
+extern	DIR *opendir();
+extern	struct direct *readdir();
+extern	int telldir();
+extern	void seekdir();
+#define rewinddir(dirp)	seekdir((dirp), (long)0)
+extern	void closedir();
+#endif /* not KERNEL */
+#endif /* _BOOT_UFS_DIR_H_ */