1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/*
* POSIX Standard: 5.1.2 Directory Operations <dirent.h>
*/
#ifndef _DIRENT_H
#define _DIRENT_H 1
#include <features.h>
__BEGIN_DECLS
#include <bits/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.
It defines the macro `_DIRENT_HAVE_D_OFF' iff there is a `d_off'
member that gives the file offset of the next directory entry.
It defines the macro `_DIRENT_HAVE_D_TYPE' iff there is a `d_type'
member that gives the type of the file.
*/
#include <bits/dirent.h>
#if (defined __USE_BSD || defined __USE_MISC) && !defined d_fileno
# 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));
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));
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));
extern struct dirent *readdir __P ((DIR *__dirp));
#if defined __USE_POSIX || defined __USE_MISC
/* Reentrant version of `readdir'. Return in RESULT a pointer to the
next entry. */
extern int __readdir_r __P ((DIR *__dirp, struct dirent *__entry,
struct dirent **__result));
extern int readdir_r __P ((DIR *__dirp, struct dirent *__entry,
struct dirent **__result));
#endif /* POSIX or misc */
/* 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 <bits/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 <bits/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 SELECTOR 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 (*__selector) __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));
# ifdef __USE_GNU
/* Function to compare two `struct dirent's by name & version. */
extern int versionsort __P ((__const __ptr_t, __const __ptr_t));
#endif
/* 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 */
|
