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/* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
/*
* POSIX Standard: 5.1.2 Directory Operations <dirent.h>
*/
#ifndef _DIRENT_H
#define _DIRENT_H 1
#include <features.h>
__BEGIN_DECLS
#include <gnu/types.h>
/* This file defines `struct dirent'.
It defines the macro `_DIRENT_HAVE_D_NAMLEN' iff there is a `d_namlen'
member that gives the length of `d_name'.
It defines the macro `_DIRENT_HAVE_D_RECLEN' iff there is a `d_reclen'
member that gives the size of the entire directory entry. */
#include <direntry.h>
#if defined(__USE_BSD) || defined(__USE_MISC)
#define d_ino d_fileno /* Backward compatibility. */
#endif
/* These macros extract size information from a `struct dirent *'.
They may evaluate their argument multiple times, so it must not
have side effects. Each of these may involve a relatively costly
call to `strlen' on some systems, so these values should be cached.
_D_EXACT_NAMLEN (DP) returns the length of DP->d_name, not including
its terminating null character.
_D_ALLOC_NAMLEN (DP) returns a size at least (_D_EXACT_NAMLEN (DP) + 1);
that is, the allocation size needed to hold the DP->d_name string.
Use this macro when you don't need the exact length, just an upper bound.
This macro is less likely to require calling `strlen' than _D_EXACT_NAMLEN.
*/
#ifdef _DIRENT_HAVE_D_NAMLEN
#define _D_EXACT_NAMLEN(d) ((d)->d_namlen)
#define _D_ALLOC_NAMLEN(d) (_D_EXACT_NAMLEN (d) + 1)
#else
#define _D_EXACT_NAMLEN(d) (strlen ((d)->d_name))
#ifdef _DIRENT_HAVE_D_RECLEN
#define _D_ALLOC_NAMLEN(d) (((char *) (d) + (d)->d_reclen) - &(d)->d_name[0])
#else
#define _D_ALLOC_NAMLEN(d) (sizeof (d)->d_name > 1 ? sizeof (d)->d_name : \
_D_EXACT_NAMLEN (d) + 1)
#endif
#endif
#ifdef __USE_BSD
/* File types for `d_type'. */
enum
{
DT_UNKNOWN = 0,
DT_FIFO = 1,
DT_CHR = 2,
DT_DIR = 4,
DT_BLK = 6,
DT_REG = 8,
DT_LNK = 10,
DT_SOCK = 12
};
/* Convert between stat structure types and directory types. */
#define IFTODT(mode) (((mode) & 0170000) >> 12)
#define DTTOIF(dirtype) ((dirtype) << 12)
#endif
/* This is the data type of directory stream objects.
The actual structure is opaque to users. */
typedef struct __dirstream DIR;
/* Open a directory stream on NAME.
Return a DIR stream on the directory, or NULL if it could not be opened. */
extern DIR *opendir __P ((__const char *__name));
/* Close the directory stream DIRP.
Return 0 if successful, -1 if not. */
extern int closedir __P ((DIR * __dirp));
/* Read a directory entry from DIRP.
Return a pointer to a `struct dirent' describing the entry,
or NULL for EOF or error. The storage returned may be overwritten
by a later readdir call on the same DIR stream. */
extern struct dirent *readdir __P ((DIR * __dirp));
/* Rewind DIRP to the beginning of the directory. */
extern void rewinddir __P ((DIR * __dirp));
#if defined(__USE_BSD) || defined(__USE_MISC)
/* Return the file descriptor used by DIRP. */
extern int dirfd __P ((DIR *__dirp));
#if defined (__OPTIMIZE__) && defined (_DIR_dirfd)
#define dirfd(dirp) _DIR_dirfd (dirp)
#endif
#ifndef MAXNAMLEN
/* Get the definitions of the POSIX.1 limits. */
#include <posix1_lim.h>
/* `MAXNAMLEN' is the BSD name for what POSIX calls `NAME_MAX'. */
#ifdef NAME_MAX
#define MAXNAMLEN NAME_MAX
#else
#define MAXNAMLEN 255
#endif
#endif
#include <gnu/types.h>
#define __need_size_t
#include <stddef.h>
/* Seek to position POS on DIRP. */
extern void seekdir __P ((DIR * __dirp, __off_t __pos));
/* Return the current position of DIRP. */
extern __off_t telldir __P ((DIR * __dirp));
/* Scan the directory DIR, calling SELECT on each directory entry.
Entries for which SELECT returns nonzero are individually malloc'd,
sorted using qsort with CMP, and collected in a malloc'd array in
*NAMELIST. Returns the number of entries selected, or -1 on error. */
extern int scandir __P ((__const char *__dir,
struct dirent ***__namelist,
int (*__select) __P ((struct dirent *)),
int (*__cmp) __P ((__const __ptr_t,
__const __ptr_t))));
/* Function to compare two `struct dirent's alphabetically. */
extern int alphasort __P ((__const __ptr_t, __const __ptr_t));
/* Read directory entries from FD into BUF, reading at most NBYTES.
Reading starts at offset *BASEP, and *BASEP is updated with the new
position after reading. Returns the number of bytes read; zero when at
end of directory; or -1 for errors. */
extern __ssize_t __getdirentries __P ((int __fd, char *__buf,
size_t __nbytes, __off_t *__basep));
extern __ssize_t getdirentries __P ((int __fd, char *__buf,
size_t __nbytes, __off_t *__basep));
#endif /* Use BSD or misc. */
__END_DECLS
#endif /* dirent.h */
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