138 lines
4.1 KiB
C
138 lines
4.1 KiB
C
/*
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* Copyright 1989-1995 Silicon Graphics Inc. All rights reserved.
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*
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* This file defines MAXNAMLEN for the kernel and for BSD-based usercode.
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* It declares the 4.3BSD directory(3C) interface if compiled user-level.
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* The libc entry points are renamed by macros at the bottom of this file
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* to BSDopendir, BSDreaddir, etc.
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*/
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#ifndef __SYS_DIR_H__
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#define __SYS_DIR_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ident "$Revision: 3.17 $"
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#include <standards.h>
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#include <sgidefs.h>
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/*
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* The upper bound on a directory entry's name length.
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*/
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#define MAXNAMLEN 255
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#ifndef _KERNEL
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/*
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* Copyright (c) 1982, 1986 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*
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* @(#)dir.h 7.2 (Berkeley) 12/22/86
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*/
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/*
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* A directory consists of some number of blocks of DIRBLKSIZ
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* bytes, where DIRBLKSIZ is chosen such that it can be transferred
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* to disk in a single atomic operation (e.g. 512 bytes on most machines).
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*
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* Each DIRBLKSIZ byte block contains some number of directory entry
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* structures, which are of variable length. Each directory entry has
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* a struct direct at the front of it, containing its inode number,
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* the length of the entry, and the length of the name contained in
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* the entry. These are followed by the name padded to a 4 byte boundary
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* with null bytes. All names are guaranteed null terminated.
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* The maximum length of a name in a directory is MAXNAMLEN.
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*
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* The macro DIRSIZ(dp) gives the amount of space required to represent
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* a directory entry. Free space in a directory is represented by
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* entries which have dp->d_reclen > DIRSIZ(dp). All DIRBLKSIZ bytes
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* in a directory block are claimed by the directory entries. This
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* usually results in the last entry in a directory having a large
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* dp->d_reclen. When entries are deleted from a directory, the
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* space is returned to the previous entry in the same directory
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* block by increasing its dp->d_reclen. If the first entry of
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* a directory block is free, then its dp->d_ino is set to 0.
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* Entries other than the first in a directory do not normally have
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* dp->d_ino set to 0.
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*/
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#define DIRBLKSIZ 4096
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#if (_MIPS_SIM == _ABIN32)
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typedef __uint64_t __bsdino;
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#else
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typedef u_long __bsdino;
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#endif
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struct direct {
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__bsdino d_ino; /* inode number of entry */
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u_short d_reclen; /* length of this record */
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u_short d_namlen; /* length of string in d_name */
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char d_name[MAXNAMLEN + 1]; /* name must be no longer than this */
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};
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/*
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* The DIRSIZ macro gives the minimum record length which will hold
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* the directory entry. This requires the amount of space in struct direct
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* without the d_name field, plus enough space for the name with a terminating
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* null byte (dp->d_namlen+1), rounded up to a (sizeof __bsdino) byte boundary.
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*/
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#undef DIRSIZ
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#define __DIRALIGN (sizeof(__bsdino)-1)
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#define DIRSIZ(dp) \
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((sizeof (struct direct) - (MAXNAMLEN+1)) + \
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(((dp)->d_namlen+1 + __DIRALIGN) &~ __DIRALIGN))
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/*
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* Definitions for library routines operating on directories.
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*/
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typedef struct _dirdesc {
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int dd_fd;
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long dd_loc;
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long dd_size;
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#if (_MIPS_SIM == _ABIN32)
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int dd_pad0; /* force dd_buf to 8-byte alignment */
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/* so d_ino in dirent will be aligned */
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#endif
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char dd_buf[DIRBLKSIZ];
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struct direct dd_direct;
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} DIR;
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#define dirfd(dirp) ((dirp)->dd_fd)
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#ifndef NULL
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#define NULL 0L
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#endif
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#if _NO_ABIAPI
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/*
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* Functions defined on directories.
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*/
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#define opendir BSDopendir
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#define readdir BSDreaddir
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#define telldir BSDtelldir
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#define seekdir BSDseekdir
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#define rewinddir(dirp) seekdir((dirp), 0L)
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#define closedir BSDclosedir
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#define scandir BSDscandir
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#define alphasort BSDalphasort
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extern DIR *BSDopendir(const char *);
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extern struct direct *BSDreaddir(DIR *);
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extern long BSDtelldir(DIR *);
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extern void BSDseekdir(DIR *, long);
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extern void BSDclosedir(DIR *);
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extern int BSDscandir(const char *, struct direct **[],
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int (*)(struct direct *), int (*)(struct direct **, struct direct **));
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extern int BSDalphasort(struct direct **, struct direct **);
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#endif /* _NO_ABIAPI */
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#endif /* !_KERNEL */
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#ifdef __cplusplus
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}
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#endif
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#endif /* __SYS_DIR_H__ */
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