175 lines
5.5 KiB
C
175 lines
5.5 KiB
C
/* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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/*
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* POSIX Standard: 5.1.2 Directory Operations <dirent.h>
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*/
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#ifndef _DIRENT_H
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#define _DIRENT_H 1
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#include <features.h>
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__BEGIN_DECLS
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#include <gnu/types.h>
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/* This file defines `struct dirent'.
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It defines the macro `_DIRENT_HAVE_D_NAMLEN' iff there is a `d_namlen'
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member that gives the length of `d_name'.
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It defines the macro `_DIRENT_HAVE_D_RECLEN' iff there is a `d_reclen'
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member that gives the size of the entire directory entry. */
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#include <direntry.h>
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#if defined(__USE_BSD) || defined(__USE_MISC)
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#define d_ino d_fileno /* Backward compatibility. */
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#endif
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/* These macros extract size information from a `struct dirent *'.
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They may evaluate their argument multiple times, so it must not
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have side effects. Each of these may involve a relatively costly
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call to `strlen' on some systems, so these values should be cached.
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_D_EXACT_NAMLEN (DP) returns the length of DP->d_name, not including
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its terminating null character.
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_D_ALLOC_NAMLEN (DP) returns a size at least (_D_EXACT_NAMLEN (DP) + 1);
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that is, the allocation size needed to hold the DP->d_name string.
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Use this macro when you don't need the exact length, just an upper bound.
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This macro is less likely to require calling `strlen' than _D_EXACT_NAMLEN.
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*/
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#ifdef _DIRENT_HAVE_D_NAMLEN
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#define _D_EXACT_NAMLEN(d) ((d)->d_namlen)
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#define _D_ALLOC_NAMLEN(d) (_D_EXACT_NAMLEN (d) + 1)
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#else
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#define _D_EXACT_NAMLEN(d) (strlen ((d)->d_name))
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#ifdef _DIRENT_HAVE_D_RECLEN
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#define _D_ALLOC_NAMLEN(d) (((char *) (d) + (d)->d_reclen) - &(d)->d_name[0])
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#else
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#define _D_ALLOC_NAMLEN(d) (sizeof (d)->d_name > 1 ? sizeof (d)->d_name : \
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_D_EXACT_NAMLEN (d) + 1)
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#endif
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#endif
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#ifdef __USE_BSD
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/* File types for `d_type'. */
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enum
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{
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DT_UNKNOWN = 0,
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DT_FIFO = 1,
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DT_CHR = 2,
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DT_DIR = 4,
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DT_BLK = 6,
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DT_REG = 8,
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DT_LNK = 10,
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DT_SOCK = 12
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};
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/* Convert between stat structure types and directory types. */
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#define IFTODT(mode) (((mode) & 0170000) >> 12)
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#define DTTOIF(dirtype) ((dirtype) << 12)
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#endif
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/* This is the data type of directory stream objects.
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The actual structure is opaque to users. */
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typedef struct __dirstream DIR;
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/* Open a directory stream on NAME.
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Return a DIR stream on the directory, or NULL if it could not be opened. */
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extern DIR *opendir __P ((__const char *__name));
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/* Close the directory stream DIRP.
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Return 0 if successful, -1 if not. */
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extern int closedir __P ((DIR * __dirp));
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/* Read a directory entry from DIRP.
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Return a pointer to a `struct dirent' describing the entry,
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or NULL for EOF or error. The storage returned may be overwritten
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by a later readdir call on the same DIR stream. */
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extern struct dirent *readdir __P ((DIR * __dirp));
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/* Rewind DIRP to the beginning of the directory. */
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extern void rewinddir __P ((DIR * __dirp));
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#if defined(__USE_BSD) || defined(__USE_MISC)
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/* Return the file descriptor used by DIRP. */
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extern int dirfd __P ((DIR *__dirp));
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#if defined (__OPTIMIZE__) && defined (_DIR_dirfd)
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#define dirfd(dirp) _DIR_dirfd (dirp)
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#endif
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#ifndef MAXNAMLEN
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/* Get the definitions of the POSIX.1 limits. */
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#include <posix1_lim.h>
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/* `MAXNAMLEN' is the BSD name for what POSIX calls `NAME_MAX'. */
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#ifdef NAME_MAX
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#define MAXNAMLEN NAME_MAX
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#else
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#define MAXNAMLEN 255
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#endif
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#endif
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#include <gnu/types.h>
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#define __need_size_t
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#include <stddef.h>
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/* Seek to position POS on DIRP. */
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extern void seekdir __P ((DIR * __dirp, __off_t __pos));
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/* Return the current position of DIRP. */
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extern __off_t telldir __P ((DIR * __dirp));
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/* Scan the directory DIR, calling SELECT on each directory entry.
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Entries for which SELECT returns nonzero are individually malloc'd,
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sorted using qsort with CMP, and collected in a malloc'd array in
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*NAMELIST. Returns the number of entries selected, or -1 on error. */
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extern int scandir __P ((__const char *__dir,
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struct dirent ***__namelist,
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int (*__select) __P ((struct dirent *)),
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int (*__cmp) __P ((__const __ptr_t,
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__const __ptr_t))));
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/* Function to compare two `struct dirent's alphabetically. */
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extern int alphasort __P ((__const __ptr_t, __const __ptr_t));
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/* Read directory entries from FD into BUF, reading at most NBYTES.
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Reading starts at offset *BASEP, and *BASEP is updated with the new
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position after reading. Returns the number of bytes read; zero when at
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end of directory; or -1 for errors. */
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extern __ssize_t __getdirentries __P ((int __fd, char *__buf,
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size_t __nbytes, __off_t *__basep));
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extern __ssize_t getdirentries __P ((int __fd, char *__buf,
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size_t __nbytes, __off_t *__basep));
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#endif /* Use BSD or misc. */
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__END_DECLS
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#endif /* dirent.h */
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