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/* Start reading the entries of a directory.
Copyright (C) 2006-2025 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <dirent.h>
#include <errno.h>
#include <stddef.h>
#if HAVE_OPENDIR
/* Override opendir(), to keep track of the open file descriptors.
Needed because there is a function dirfd(). */
#else
# include "filename.h"
#endif
#include <stdlib.h>
#include <string.h>
#if GNULIB_defined_DIR
# include "dirent-private.h"
#endif
#if REPLACE_FCHDIR
# include <unistd.h>
#endif
#if defined _WIN32 && ! defined __CYGWIN__
/* Don't assume that UNICODE is not defined. */
# undef WIN32_FIND_DATA
# define WIN32_FIND_DATA WIN32_FIND_DATAA
# undef GetFullPathName
# define GetFullPathName GetFullPathNameA
# undef FindFirstFile
# define FindFirstFile FindFirstFileA
#endif
DIR *
opendir (const char *dir_name)
#undef opendir
{
#if HAVE_DIRENT_H /* equivalent to HAVE_OPENDIR */
DIR *dirp;
# if GNULIB_defined_DIR
# undef DIR
dirp = (struct gl_directory *) malloc (sizeof (struct gl_directory));
if (dirp == NULL)
{
errno = ENOMEM;
return NULL;
}
DIR *real_dirp = opendir (dir_name);
if (real_dirp == NULL)
{
int saved_errno = errno;
free (dirp);
errno = saved_errno;
return NULL;
}
dirp->fd_to_close = -1;
dirp->real_dirp = real_dirp;
# else
dirp = opendir (dir_name);
if (dirp == NULL)
return NULL;
# endif
#else
char dir_name_mask[MAX_PATH + 1 + 1 + 1];
int status;
HANDLE current;
WIN32_FIND_DATA entry;
struct gl_directory *dirp;
if (dir_name[0] == '\0')
{
errno = ENOENT;
return NULL;
}
/* Make the dir_name absolute, so that we continue reading the same
directory if the current directory changed between this opendir()
call and a subsequent rewinddir() call. */
if (!GetFullPathName (dir_name, MAX_PATH, dir_name_mask, NULL))
{
errno = EINVAL;
return NULL;
}
/* Append the mask.
"*" and "*.*" appear to be equivalent. */
{
char *p;
p = dir_name_mask + strlen (dir_name_mask);
if (p > dir_name_mask && !ISSLASH (p[-1]))
*p++ = '\\';
*p++ = '*';
*p = '\0';
}
/* Start searching the directory. */
status = -1;
current = FindFirstFile (dir_name_mask, &entry);
if (current == INVALID_HANDLE_VALUE)
{
switch (GetLastError ())
{
case ERROR_FILE_NOT_FOUND:
status = -2;
break;
case ERROR_PATH_NOT_FOUND:
errno = ENOENT;
return NULL;
case ERROR_DIRECTORY:
errno = ENOTDIR;
return NULL;
case ERROR_ACCESS_DENIED:
errno = EACCES;
return NULL;
default:
errno = EIO;
return NULL;
}
}
/* Allocate the result. */
dirp =
(struct gl_directory *)
malloc (offsetof (struct gl_directory, dir_name_mask[0])
+ strlen (dir_name_mask) + 1);
if (dirp == NULL)
{
if (current != INVALID_HANDLE_VALUE)
FindClose (current);
errno = ENOMEM;
return NULL;
}
dirp->fd_to_close = -1;
dirp->status = status;
dirp->current = current;
if (status == -1)
memcpy (&dirp->entry, &entry, sizeof (WIN32_FIND_DATA));
strcpy (dirp->dir_name_mask, dir_name_mask);
#endif
#if REPLACE_FCHDIR
{
int fd = dirfd (dirp);
if (0 <= fd && _gl_register_fd (fd, dir_name) != fd)
{
int saved_errno = errno;
closedir (dirp);
errno = saved_errno;
return NULL;
}
}
#endif
return dirp;
}
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