c6acfe86c7
conflicts due to radically different approaches to security and bug fixes. In some cases I re-started from the vendor version and reimplemented our patches. Fortunately, this is not enabled by default in -current.
138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/* savedir.c -- save the list of files in a directory in a string
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Copyright (C) 1990, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005,
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2006 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
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#include <config.h>
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#include "savedir.h"
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#include <sys/types.h>
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#include <errno.h>
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#include <dirent.h>
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#ifndef _D_EXACT_NAMLEN
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# define _D_EXACT_NAMLEN(dp) strlen ((dp)->d_name)
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#endif
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include "openat.h"
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#include "xalloc.h"
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#ifndef NAME_SIZE_DEFAULT
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# define NAME_SIZE_DEFAULT 512
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#endif
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/* The results of opendir() in this file are not used with dirfd and fchdir,
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therefore save some unnecessary work in fchdir.c. */
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#undef opendir
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#undef closedir
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/* Return a freshly allocated string containing the file names
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in directory DIRP, separated by '\0' characters;
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the end is marked by two '\0' characters in a row.
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Return NULL (setting errno) if DIRP cannot be read or closed.
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If DIRP is NULL, return NULL without affecting errno. */
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static char *
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savedirstream (DIR *dirp)
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{
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char *name_space;
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size_t allocated = NAME_SIZE_DEFAULT;
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size_t used = 0;
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int save_errno;
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if (dirp == NULL)
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return NULL;
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name_space = xmalloc (allocated);
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for (;;)
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{
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struct dirent const *dp;
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char const *entry;
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errno = 0;
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dp = readdir (dirp);
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if (! dp)
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break;
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/* Skip "", ".", and "..". "" is returned by at least one buggy
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implementation: Solaris 2.4 readdir on NFS file systems. */
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entry = dp->d_name;
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if (entry[entry[0] != '.' ? 0 : entry[1] != '.' ? 1 : 2] != '\0')
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{
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size_t entry_size = _D_EXACT_NAMLEN (dp) + 1;
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if (used + entry_size < used)
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xalloc_die ();
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if (allocated <= used + entry_size)
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{
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do
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{
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if (2 * allocated < allocated)
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xalloc_die ();
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allocated *= 2;
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}
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while (allocated <= used + entry_size);
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name_space = xrealloc (name_space, allocated);
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}
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memcpy (name_space + used, entry, entry_size);
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used += entry_size;
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}
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}
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name_space[used] = '\0';
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save_errno = errno;
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if (closedir (dirp) != 0)
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save_errno = errno;
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if (save_errno != 0)
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{
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free (name_space);
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errno = save_errno;
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return NULL;
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}
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return name_space;
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}
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/* Return a freshly allocated string containing the file names
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in directory DIR, separated by '\0' characters;
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the end is marked by two '\0' characters in a row.
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Return NULL (setting errno) if DIR cannot be opened, read, or closed. */
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char *
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savedir (char const *dir)
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{
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return savedirstream (opendir (dir));
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}
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/* Return a freshly allocated string containing the file names
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in directory FD, separated by '\0' characters;
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the end is marked by two '\0' characters in a row.
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Return NULL (setting errno) if FD cannot be read or closed. */
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char *
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fdsavedir (int fd)
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{
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return savedirstream (fdopendir (fd));
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}
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