mirror of
https://github.com/coreutils/coreutils.git
synced 2024-11-26 03:13:42 +08:00
2c63fed0e8
a directory's st_size can have an arbitrary value, so the old usage could waste an arbitrary amount of memory. All uses changed.
130 lines
3.0 KiB
C
130 lines
3.0 KiB
C
/* savedir.c -- save the list of files in a directory in a string
|
|
|
|
Copyright 1990, 1997, 1998, 1999, 2000, 2001 Free Software
|
|
Foundation, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
This program 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software Foundation,
|
|
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|
|
|
/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
|
|
|
|
#if HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <errno.h>
|
|
#ifndef errno
|
|
extern int errno;
|
|
#endif
|
|
|
|
#if HAVE_DIRENT_H
|
|
# include <dirent.h>
|
|
#else
|
|
# define dirent direct
|
|
# if HAVE_SYS_NDIR_H
|
|
# include <sys/ndir.h>
|
|
# endif
|
|
# if HAVE_SYS_DIR_H
|
|
# include <sys/dir.h>
|
|
# endif
|
|
# if HAVE_NDIR_H
|
|
# include <ndir.h>
|
|
# endif
|
|
#endif
|
|
|
|
#ifdef CLOSEDIR_VOID
|
|
/* Fake a return value. */
|
|
# define CLOSEDIR(d) (closedir (d), 0)
|
|
#else
|
|
# define CLOSEDIR(d) closedir (d)
|
|
#endif
|
|
|
|
#ifdef STDC_HEADERS
|
|
# include <stdlib.h>
|
|
# include <string.h>
|
|
#endif
|
|
#ifndef NULL
|
|
# define NULL 0
|
|
#endif
|
|
|
|
#include "savedir.h"
|
|
#include "xalloc.h"
|
|
|
|
/* Return a freshly allocated string containing the filenames
|
|
in directory DIR, separated by '\0' characters;
|
|
the end is marked by two '\0' characters in a row.
|
|
Return NULL (setting errno) if DIR cannot be opened, read, or closed. */
|
|
|
|
#ifndef NAME_SIZE_DEFAULT
|
|
# define NAME_SIZE_DEFAULT 512
|
|
#endif
|
|
|
|
char *
|
|
savedir (const char *dir)
|
|
{
|
|
DIR *dirp;
|
|
struct dirent *dp;
|
|
char *name_space;
|
|
size_t allocated = NAME_SIZE_DEFAULT;
|
|
size_t used = 0;
|
|
int save_errno;
|
|
|
|
dirp = opendir (dir);
|
|
if (dirp == NULL)
|
|
return NULL;
|
|
|
|
name_space = xmalloc (allocated);
|
|
|
|
errno = 0;
|
|
while ((dp = readdir (dirp)) != NULL)
|
|
{
|
|
/* Skip "", ".", and "..". "" is returned by at least one buggy
|
|
implementation: Solaris 2.4 readdir on NFS filesystems. */
|
|
char const *entry = dp->d_name;
|
|
if (entry[entry[0] != '.' ? 0 : entry[1] != '.' ? 1 : 2] != '\0')
|
|
{
|
|
size_t entry_size = strlen (entry) + 1;
|
|
if (used + entry_size < used)
|
|
xalloc_die ();
|
|
if (allocated <= used + entry_size)
|
|
{
|
|
do
|
|
{
|
|
if (2 * allocated < allocated)
|
|
xalloc_die ();
|
|
allocated *= 2;
|
|
}
|
|
while (allocated <= used + entry_size);
|
|
|
|
name_space = xrealloc (name_space, allocated);
|
|
}
|
|
memcpy (name_space + used, entry, entry_size);
|
|
used += entry_size;
|
|
}
|
|
}
|
|
name_space[used] = '\0';
|
|
save_errno = errno;
|
|
if (CLOSEDIR (dirp) != 0)
|
|
save_errno = errno;
|
|
if (save_errno != 0)
|
|
{
|
|
free (name_space);
|
|
errno = save_errno;
|
|
return NULL;
|
|
}
|
|
return name_space;
|
|
}
|