busybox-w32/win32/dirent.c, branch waitfor

win32: workaround for overflow of 8.3 short name

2026-07-13T15:02:56+00:00

In certain circumstances 'FindNextFileA()' can fail because the legacy DOS 8.3 short name doesn't fit in the buffer supplied. This can be avoided by using 'FindFirstFileExA()' instead, but with a setting that isn't available on Windows XP. - The problem doesn't arise in the standard 32 and 64 bit builds, so no change is required. - Builds with full Unicode support target platforms which have the required setting. They can use 'FindFirstFileExA()' unconditionally, at the cost of 36-56 bytes. - Builds which include the UTF-8 manifest but which are allowed to run on systems prior to Windows 10 need to check whether they need to call 'FindFirstFileExA()' at runtime. This adds 100 bytes. (GitHub issue #506) Signed-off-by: Ron Yorston

win32: extend handling of virtual disks

2026-06-08T13:02:15+00:00

Commit 62e4c5d29 (win32: special treatment for virtual hard disk) added special treatment for mount points associated with virtual hard disks. One statement made there was incorrect: a VHD without a drive letter containing no files *does* have a '.' directory. The error message for this case was misleading. The changes made to handle VHDs were insufficiently general: - lstat(2) only resolved symlinks for the explicit path '.'. It should also do so for paths of the form 'path/to/.'. - opendir(3) only generated entries for '.' and '..' directories when FindFirstFileA() failed for the path '.'. It should also do so for any path which resolves to a volume mount point. Make the necessary changes. Adds 64-80 bytes. (GitHub issue #597) Signed-off-by: Ron Yorston

win32: special treatment for virtual hard disk

2026-06-07T14:23:48+00:00

Virtual hard disks (VHD) without a drive letter gave incorrect results in 'ls' and 'stat'. There were two problems: - If the disk is empty it doesn't have a '.' directory. - If it contains files the '.' directory is actually the mount point, which looks like a symbolic link and can't be opened as a directory. Modify our 'stat(2)' and 'opendir(3)' implementations to handle these quirks. Adds 78-80 bytes. (GitHub issue #597) Signed-off-by: Ron Yorston

win32: add FAST_FUNC annotations

2026-05-04T10:51:00+00:00

I've been far too lax in applying FAST_FUNC annotations. These can make function calls smaller and faster, but only on 32-bit systems and for non-static, non-variadic functions with non-void arguments. Saves 4680 bytes in the 32-bit build; 64-bit builds are unaffected.

win32: fake directories in readdir(2)

2025-03-17T08:59:56+00:00

The emulation of readdir(2) didn't include the '.' and '..' directories in the root of a logical drive. This resulted in the 'ls' applet (and others) not matching the expected Unix behaviour. Alter the emulation of readdir(2) to include fake '.' and '..' directories if necessary. Adds 88-112 bytes. (GitHub issue #487)

win32: missing support for "app exec link" reparse points

2023-09-18T10:35:11+00:00

Commit 603af9bb9 (win32: support "app exec link" reparse points) added support for IO_REPARSE_TAG_APPEXECLINK reparse points by pretending they're symbolic links. One change was missed, in the implementation of dirent. Costs 16 bytes.

win32: always allow d_type member of struct dirent

2022-12-22T11:38:39+00:00

The d_type member of struct dirent is required by the implementation of glob(3). As a result it isn't possible to build the make applet unless FEATURE_EXTRA_FILE_DATA is configured. Allow d_type unconditionally.

win32: try to get link count for directories

2022-05-15T07:52:26+00:00

On Unix the link count of a directory reflects the number of subdirectories it contains. Enhance readdir(3) to return file types and use this to count subdirectories when stat(2) is called for a directory. As with other features that might slow down stat(2) this is controlled by the build-time setting FEATURE_EXTRA_FILE_DATA. (Commit d82db8e9a 'win32: make stat(2) fetch additional metadata'). (GitHub issue #254)

win32: add local dirent implementation

2021-06-13T07:13:25+00:00

Add a cut down version of the dirent implementation from git. The git developers said: The mingw-runtime implemenation of opendir, readdir and closedir sets errno to 0 on success, something that POSIX explicitly forbids. This also avoids having to link against libssp.a (commit 13eb34205) and reduces the size of the binary by 2KB.