103 lines
3 KiB
C
103 lines
3 KiB
C
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/* Read the next entry of a directory.
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Copyright (C) 2011-2021 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 3 of the License, or
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(at your option) 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, 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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#include "dirent-private.h"
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/* Don't assume that UNICODE is not defined. */
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#undef FindNextFile
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#define FindNextFile FindNextFileA
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struct dirent *
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readdir (DIR *dirp)
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{
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char type;
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struct dirent *result;
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/* There is no need to add code to produce entries for "." and "..".
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According to the POSIX:2008 section "4.12 Pathname Resolution"
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<https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html>
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"." and ".." are syntactic entities.
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POSIX also says:
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"If entries for dot or dot-dot exist, one entry shall be returned
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for dot and one entry shall be returned for dot-dot; otherwise,
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they shall not be returned." */
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switch (dirp->status)
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{
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case -2:
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/* End of directory already reached. */
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return NULL;
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case -1:
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break;
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case 0:
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if (!FindNextFile (dirp->current, &dirp->entry))
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{
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switch (GetLastError ())
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{
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case ERROR_NO_MORE_FILES:
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dirp->status = -2;
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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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break;
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default:
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errno = dirp->status;
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return NULL;
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}
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dirp->status = 0;
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if (dirp->entry.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
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type = DT_DIR;
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else if (dirp->entry.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)
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type = DT_LNK;
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else if ((dirp->entry.dwFileAttributes
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& ~(FILE_ATTRIBUTE_READONLY
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| FILE_ATTRIBUTE_HIDDEN
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| FILE_ATTRIBUTE_SYSTEM
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| FILE_ATTRIBUTE_ARCHIVE
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| FILE_ATTRIBUTE_NORMAL
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| FILE_ATTRIBUTE_TEMPORARY
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| FILE_ATTRIBUTE_SPARSE_FILE
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| FILE_ATTRIBUTE_COMPRESSED
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| FILE_ATTRIBUTE_NOT_CONTENT_INDEXED
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| FILE_ATTRIBUTE_ENCRYPTED)) == 0)
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/* Devices like COM1, LPT1, NUL would also have the attributes 0x20 but
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they cannot occur here. */
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type = DT_REG;
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else
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type = DT_UNKNOWN;
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/* Reuse the memory of dirp->entry for the result. */
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result =
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(struct dirent *)
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((char *) dirp->entry.cFileName - offsetof (struct dirent, d_name[0]));
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result->d_type = type;
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return result;
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}
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