180 lines
4 KiB
C
180 lines
4 KiB
C
/* Start reading the entries of a directory.
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Copyright (C) 2006-2023 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include <dirent.h>
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#include <errno.h>
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#include <stddef.h>
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#if HAVE_OPENDIR
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/* Override opendir(), to keep track of the open file descriptors.
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Needed because there is a function dirfd(). */
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#else
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# include <stdlib.h>
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# include "dirent-private.h"
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# include "filename.h"
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#endif
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#if REPLACE_FCHDIR
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# include <unistd.h>
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#endif
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#ifdef __KLIBC__
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# include <io.h>
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# include <fcntl.h>
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#endif
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#if defined _WIN32 && ! defined __CYGWIN__
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/* Don't assume that UNICODE is not defined. */
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# undef WIN32_FIND_DATA
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# define WIN32_FIND_DATA WIN32_FIND_DATAA
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# undef GetFullPathName
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# define GetFullPathName GetFullPathNameA
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# undef FindFirstFile
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# define FindFirstFile FindFirstFileA
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#endif
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DIR *
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opendir (const char *dir_name)
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{
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#if HAVE_OPENDIR
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# undef opendir
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DIR *dirp;
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dirp = opendir (dir_name);
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if (dirp == NULL)
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return NULL;
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# ifdef __KLIBC__
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{
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int fd = open (dir_name, O_RDONLY);
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if (fd == -1 || _gl_register_dirp_fd (fd, dirp))
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{
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int saved_errno = errno;
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close (fd);
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closedir (dirp);
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errno = saved_errno;
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return NULL;
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}
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}
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# endif
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#else
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char dir_name_mask[MAX_PATH + 1 + 1 + 1];
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int status;
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HANDLE current;
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WIN32_FIND_DATA entry;
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struct gl_directory *dirp;
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if (dir_name[0] == '\0')
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{
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errno = ENOENT;
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return NULL;
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}
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/* Make the dir_name absolute, so that we continue reading the same
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directory if the current directory changed between this opendir()
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call and a subsequent rewinddir() call. */
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if (!GetFullPathName (dir_name, MAX_PATH, dir_name_mask, NULL))
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{
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errno = EINVAL;
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return NULL;
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}
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/* Append the mask.
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"*" and "*.*" appear to be equivalent. */
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{
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char *p;
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p = dir_name_mask + strlen (dir_name_mask);
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if (p > dir_name_mask && !ISSLASH (p[-1]))
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*p++ = '\\';
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*p++ = '*';
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*p = '\0';
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}
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/* Start searching the directory. */
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status = -1;
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current = FindFirstFile (dir_name_mask, &entry);
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if (current == INVALID_HANDLE_VALUE)
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{
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switch (GetLastError ())
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{
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case ERROR_FILE_NOT_FOUND:
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status = -2;
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break;
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case ERROR_PATH_NOT_FOUND:
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errno = ENOENT;
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return NULL;
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case ERROR_DIRECTORY:
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errno = ENOTDIR;
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return NULL;
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case ERROR_ACCESS_DENIED:
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errno = EACCES;
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return NULL;
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default:
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errno = EIO;
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return NULL;
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}
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}
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/* Allocate the result. */
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dirp =
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(struct gl_directory *)
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malloc (offsetof (struct gl_directory, dir_name_mask[0])
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+ strlen (dir_name_mask) + 1);
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if (dirp == NULL)
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{
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if (current != INVALID_HANDLE_VALUE)
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FindClose (current);
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errno = ENOMEM;
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return NULL;
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}
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dirp->status = status;
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dirp->current = current;
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if (status == -1)
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memcpy (&dirp->entry, &entry, sizeof (WIN32_FIND_DATA));
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strcpy (dirp->dir_name_mask, dir_name_mask);
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#endif
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#if REPLACE_FCHDIR
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{
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int fd = dirfd (dirp);
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if (0 <= fd && _gl_register_fd (fd, dir_name) != fd)
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{
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int saved_errno = errno;
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closedir (dirp);
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errno = saved_errno;
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return NULL;
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}
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}
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#endif
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return dirp;
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}
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