Initial revision

2005-04-21 14:53:53 +00:00
commit 9865aeaa79
2264 changed files with 411685 additions and 0 deletions
@@ -0,0 +1,81 @@
+/*	dirent.h - Declarations for directory reading routines.
+ *							Author: Kees J. Bot
+ *								24 Apr 1989
+ * 
+ * Note: The V7 format directory entries used under Minix must be transformed
+ * into a struct dirent with a d_name of at least 15 characters.  Given that
+ * we have to transform V7 entries anyhow it is little trouble to let the
+ * routines understand the so-called "flex" directory format too.
+ */
+
+#ifndef _DIRENT_H
+#define _DIRENT_H
+
+#ifndef _TYPES_H
+#include <sys/types.h>
+#endif
+
+#include <sys/dir.h>
+
+/* _fl_direct is a flexible directory entry.  Actually it's a union of 8
+ * characters and the 3 fields defined below. 
+ */
+
+/* Flexible directory entry: */
+struct _fl_direct {		/* First slot in an entry */
+	ino_t		d_ino;
+	unsigned char	d_extent;
+	char		d_name[3];  /* two characters for the shortest name */
+};
+
+	/* Name of length len needs _EXTENT(len) extra slots. */
+#define _EXTENT(len)	(((len) + 5) >> 3)
+
+/* Version 7 directory entry: */
+struct _v7_direct {		
+	ino_t		d_ino;
+	char		d_name[DIRSIZ];
+};
+
+/* The block size must be at least 1024 bytes, because otherwise
+ * the superblock (at 1024 bytes) overlaps with other filesystem data.
+ */
+#define MIN_BLOCK_SIZE		 1024
+#define MAX_BLOCK_SIZE		 8192
+
+/* This is the block size for the fixed versions of the filesystem (V1/V2) */
+#define STATIC_BLOCK_SIZE	1024
+
+#define STATIC_FLEX_PER_BLOCK (STATIC_BLOCK_SIZE/sizeof(struct _fl_direct))
+#define FLEX_PER_V7 (_EXTENT(DIRSIZ) + 1)
+#define FLEX_PER_BLOCK (STATIC_BLOCK_SIZE/sizeof(struct _fl_direct))
+
+/* Definitions for the directory(3) routines: */
+typedef struct {
+	char		_fd;	/* Filedescriptor of open directory */
+	char		_v7;	/* Directory is Version 7 */
+	short		_count;	/* This many objects in buf */
+	off_t		_pos;	/* Position in directory file */
+	struct _fl_direct  *_ptr;	/* Next slot in buf */
+	struct _fl_direct  _buf[FLEX_PER_BLOCK]; /* One block of a directory file */
+	struct _fl_direct  _v7f[FLEX_PER_V7];	 /* V7 entry transformed to flex */
+} DIR;
+
+struct dirent {		/* Largest entry (8 slots) */
+	ino_t		d_ino;		/* I-node number */
+	unsigned char	d_extent;	/* Extended with this many slots */
+	char		d_name[61];	/* Null terminated name */
+};
+
+/* Function Prototypes. */
+_PROTOTYPE( int closedir, (DIR *_dirp)					);
+_PROTOTYPE( DIR *opendir, (const char *_dirname)			);
+_PROTOTYPE( struct dirent *readdir, (DIR *_dirp)			);
+_PROTOTYPE( void rewinddir, (DIR *_dirp)				);
+
+#ifdef _MINIX
+_PROTOTYPE( int seekdir, (DIR *_dirp, off_t _loc)			);
+_PROTOTYPE( off_t telldir, (DIR *_dirp)					);
+#endif
+
+#endif /* _DIRENT_H */