1 /* savedir.c -- save the list of files in a directory in a string
3 Copyright (C) 1990, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005,
4 2006 Free Software Foundation, Inc.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
20 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
26 #include <sys/types.h>
31 #ifndef _D_EXACT_NAMLEN
32 # define _D_EXACT_NAMLEN(dp) strlen ((dp)->d_name)
42 #ifndef NAME_SIZE_DEFAULT
43 # define NAME_SIZE_DEFAULT 512
46 /* The results of opendir() in this file are not used with dirfd and fchdir,
47 therefore save some unnecessary work in fchdir.c. */
51 /* Return a freshly allocated string containing the file names
52 in directory DIRP, separated by '\0' characters;
53 the end is marked by two '\0' characters in a row.
54 Return NULL (setting errno) if DIRP cannot be read or closed.
55 If DIRP is NULL, return NULL without affecting errno. */
58 savedirstream (DIR *dirp)
61 size_t allocated = NAME_SIZE_DEFAULT;
68 name_space = xmalloc (allocated);
72 struct dirent const *dp;
80 /* Skip "", ".", and "..". "" is returned by at least one buggy
81 implementation: Solaris 2.4 readdir on NFS file systems. */
83 if (entry[entry[0] != '.' ? 0 : entry[1] != '.' ? 1 : 2] != '\0')
85 size_t entry_size = _D_EXACT_NAMLEN (dp) + 1;
86 if (used + entry_size < used)
88 if (allocated <= used + entry_size)
92 if (2 * allocated < allocated)
96 while (allocated <= used + entry_size);
98 name_space = xrealloc (name_space, allocated);
100 memcpy (name_space + used, entry, entry_size);
104 name_space[used] = '\0';
106 if (closedir (dirp) != 0)
117 /* Return a freshly allocated string containing the file names
118 in directory DIR, separated by '\0' characters;
119 the end is marked by two '\0' characters in a row.
120 Return NULL (setting errno) if DIR cannot be opened, read, or closed. */
123 savedir (char const *dir)
125 return savedirstream (opendir (dir));
128 /* Return a freshly allocated string containing the file names
129 in directory FD, separated by '\0' characters;
130 the end is marked by two '\0' characters in a row.
131 Return NULL (setting errno) if FD cannot be read or closed. */
136 return savedirstream (fdopendir (fd));