1 /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
20 * POSIX Standard: 5.1.2 Directory Operations <dirent.h>
30 #include <bits/types.h>
32 /* This file defines `struct dirent'.
34 It defines the macro `_DIRENT_HAVE_D_NAMLEN' iff there is a `d_namlen'
35 member that gives the length of `d_name'.
37 It defines the macro `_DIRENT_HAVE_D_RECLEN' iff there is a `d_reclen'
38 member that gives the size of the entire directory entry.
40 It defines the macro `_DIRENT_HAVE_D_OFF' iff there is a `d_off'
41 member that gives the file offset of the next directory entry.
43 It defines the macro `_DIRENT_HAVE_D_TYPE' iff there is a `d_type'
44 member that gives the type of the file.
47 #include <bits/dirent.h>
49 #if (defined __USE_BSD || defined __USE_MISC) && !defined d_fileno
50 # define d_ino d_fileno /* Backward compatibility. */
53 /* These macros extract size information from a `struct dirent *'.
54 They may evaluate their argument multiple times, so it must not
55 have side effects. Each of these may involve a relatively costly
56 call to `strlen' on some systems, so these values should be cached.
58 _D_EXACT_NAMLEN (DP) returns the length of DP->d_name, not including
59 its terminating null character.
61 _D_ALLOC_NAMLEN (DP) returns a size at least (_D_EXACT_NAMLEN (DP) + 1);
62 that is, the allocation size needed to hold the DP->d_name string.
63 Use this macro when you don't need the exact length, just an upper bound.
64 This macro is less likely to require calling `strlen' than _D_EXACT_NAMLEN.
67 #ifdef _DIRENT_HAVE_D_NAMLEN
68 # define _D_EXACT_NAMLEN(d) ((d)->d_namlen)
69 # define _D_ALLOC_NAMLEN(d) (_D_EXACT_NAMLEN (d) + 1)
71 # define _D_EXACT_NAMLEN(d) (strlen ((d)->d_name))
72 # ifdef _DIRENT_HAVE_D_RECLEN
73 # define _D_ALLOC_NAMLEN(d) (((char *) (d) + (d)->d_reclen) - &(d)->d_name[0])
75 # define _D_ALLOC_NAMLEN(d) (sizeof (d)->d_name > 1 ? sizeof (d)->d_name : \
76 _D_EXACT_NAMLEN (d) + 1)
82 /* File types for `d_type'. */
86 # define DT_UNKNOWN DT_UNKNOWN
88 # define DT_FIFO DT_FIFO
90 # define DT_CHR DT_CHR
92 # define DT_DIR DT_DIR
94 # define DT_BLK DT_BLK
96 # define DT_REG DT_REG
98 # define DT_LNK DT_LNK
100 # define DT_SOCK DT_SOCK
103 /* Convert between stat structure types and directory types. */
104 # define IFTODT(mode) (((mode) & 0170000) >> 12)
105 # define DTTOIF(dirtype) ((dirtype) << 12)
109 /* This is the data type of directory stream objects.
110 The actual structure is opaque to users. */
111 typedef struct __dirstream DIR;
113 /* Open a directory stream on NAME.
114 Return a DIR stream on the directory, or NULL if it could not be opened. */
115 extern DIR *__opendir __P ((__const char *__name));
116 extern DIR *opendir __P ((__const char *__name));
118 /* Close the directory stream DIRP.
119 Return 0 if successful, -1 if not. */
120 extern int __closedir __P ((DIR *__dirp));
121 extern int closedir __P ((DIR *__dirp));
123 /* Read a directory entry from DIRP. Return a pointer to a `struct
124 dirent' describing the entry, or NULL for EOF or error. The
125 storage returned may be overwritten by a later readdir call on the
128 If the Large File Support API is selected we have to use the
129 appropriate interface. */
130 extern struct dirent *__readdir __P ((DIR *__dirp));
131 #ifndef __USE_FILE_OFFSET64
132 extern struct dirent *readdir __P ((DIR *__dirp));
134 extern struct dirent *readdir __P ((DIR *__dirp)) __asm__ ("readdir64");
137 #ifdef __USE_LARGEFILE64
138 extern struct dirent64 *readdir64 __P ((DIR *__dirp));
141 #if defined __USE_POSIX || defined __USE_MISC
142 /* Reentrant version of `readdir'. Return in RESULT a pointer to the
144 extern int __readdir_r __P ((DIR *__dirp, struct dirent *__entry,
145 struct dirent **__result));
146 # ifndef __USE_FILE_OFFSET64
147 extern int readdir_r __P ((DIR *__dirp, struct dirent *__entry,
148 struct dirent **__result));
150 extern int readdir_r __P ((DIR *__dirp, struct dirent *__entry,
151 struct dirent **__result))
152 __asm__ ("readdir64_r");
155 # ifdef __USE_LARGEFILE64
156 extern int readdir64_r __P ((DIR *__dirp, struct dirent64 *__entry,
157 struct dirent64 **__result));
159 #endif /* POSIX or misc */
161 /* Rewind DIRP to the beginning of the directory. */
162 extern void rewinddir __P ((DIR *__dirp));
164 #if defined __USE_BSD || defined __USE_MISC || defined __USE_XOPEN
165 # include <bits/types.h>
167 /* Seek to position POS on DIRP. */
168 extern void seekdir __P ((DIR *__dirp, __off_t __pos));
170 /* Return the current position of DIRP. */
171 extern __off_t telldir __P ((DIR *__dirp));
174 #if defined __USE_BSD || defined __USE_MISC
176 /* Return the file descriptor used by DIRP. */
177 extern int dirfd __P ((DIR *__dirp));
179 # if defined __OPTIMIZE__ && defined _DIR_dirfd
180 # define dirfd(dirp) _DIR_dirfd (dirp)
184 /* Get the definitions of the POSIX.1 limits. */
185 # include <bits/posix1_lim.h>
187 /* `MAXNAMLEN' is the BSD name for what POSIX calls `NAME_MAX'. */
189 # define MAXNAMLEN NAME_MAX
191 # define MAXNAMLEN 255
195 # define __need_size_t
198 /* Scan the directory DIR, calling SELECTOR on each directory entry.
199 Entries for which SELECT returns nonzero are individually malloc'd,
200 sorted using qsort with CMP, and collected in a malloc'd array in
201 *NAMELIST. Returns the number of entries selected, or -1 on error. */
202 extern int scandir __P ((__const char *__dir,
203 struct dirent ***__namelist,
204 int (*__selector) __P ((struct dirent *)),
205 int (*__cmp) __P ((__const __ptr_t,
208 /* Function to compare two `struct dirent's alphabetically. */
209 extern int alphasort __P ((__const __ptr_t, __const __ptr_t));
212 /* Function to compare two `struct dirent's by name & version. */
213 extern int versionsort __P ((__const __ptr_t, __const __ptr_t));
216 /* Read directory entries from FD into BUF, reading at most NBYTES.
217 Reading starts at offset *BASEP, and *BASEP is updated with the new
218 position after reading. Returns the number of bytes read; zero when at
219 end of directory; or -1 for errors. */
220 extern __ssize_t __getdirentries __P ((int __fd, char *__buf,
221 size_t __nbytes, __off_t *__basep));
222 extern __ssize_t getdirentries __P ((int __fd, char *__buf,
223 size_t __nbytes, __off_t *__basep));
226 #endif /* Use BSD or misc. */
230 #endif /* dirent.h */