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-rw-r--r--lib/readdir.c98
1 files changed, 98 insertions, 0 deletions
diff --git a/lib/readdir.c b/lib/readdir.c
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+++ b/lib/readdir.c
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+/* Read the next entry of a directory.
+ Copyright (C) 2011-2020 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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+/* Specification. */
+#include <dirent.h>
+
+#include <errno.h>
+#include <stddef.h>
+
+#include "dirent-private.h"
+
+struct dirent *
+readdir (DIR *dirp)
+{
+ char type;
+ struct dirent *result;
+
+ /* There is no need to add code to produce entries for "." and "..".
+ According to the POSIX:2008 section "4.12 Pathname Resolution"
+ <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html>
+ "." and ".." are syntactic entities.
+ POSIX also says:
+ "If entries for dot or dot-dot exist, one entry shall be returned
+ for dot and one entry shall be returned for dot-dot; otherwise,
+ they shall not be returned." */
+
+ switch (dirp->status)
+ {
+ case -2:
+ /* End of directory already reached. */
+ return NULL;
+ case -1:
+ break;
+ case 0:
+ if (!FindNextFile (dirp->current, &dirp->entry))
+ {
+ switch (GetLastError ())
+ {
+ case ERROR_NO_MORE_FILES:
+ dirp->status = -2;
+ return NULL;
+ default:
+ errno = EIO;
+ return NULL;
+ }
+ }
+ break;
+ default:
+ errno = dirp->status;
+ return NULL;
+ }
+
+ dirp->status = 0;
+
+ if (dirp->entry.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+ type = DT_DIR;
+ else if (dirp->entry.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)
+ type = DT_LNK;
+ else if ((dirp->entry.dwFileAttributes
+ & ~(FILE_ATTRIBUTE_READONLY
+ | FILE_ATTRIBUTE_HIDDEN
+ | FILE_ATTRIBUTE_SYSTEM
+ | FILE_ATTRIBUTE_ARCHIVE
+ | FILE_ATTRIBUTE_NORMAL
+ | FILE_ATTRIBUTE_TEMPORARY
+ | FILE_ATTRIBUTE_SPARSE_FILE
+ | FILE_ATTRIBUTE_COMPRESSED
+ | FILE_ATTRIBUTE_NOT_CONTENT_INDEXED
+ | FILE_ATTRIBUTE_ENCRYPTED)) == 0)
+ /* Devices like COM1, LPT1, NUL would also have the attributes 0x20 but
+ they cannot occur here. */
+ type = DT_REG;
+ else
+ type = DT_UNKNOWN;
+
+ /* Reuse the memory of dirp->entry for the result. */
+ result =
+ (struct dirent *)
+ ((char *) dirp->entry.cFileName - offsetof (struct dirent, d_name[0]));
+ result->d_type = type;
+
+ return result;
+}