busybox-w32/win32/mingw.c, branch long_pathsA mirror of https://github.com/rmyorston/busybox-w32.git
https://git.lua4.win/busybox-w32/atom?h=long_paths2026-02-27T14:27:40+00:00win32: add (some) long path support2026-02-27T14:27:40+00:00Ron Yorstonrmy@pobox.com2026-02-27T13:57:40+00:00urn:sha1:ed525e2db10081f095d2fccc1b02830654470401
Use the longPathAware manifest entry to handle path lengths above
260. This requires the LongPathsEnabled registry key to be set
at run-time.
Modify (some) WIN32 API calls to use the wide-character variant.
These features are controlled by the build-time configuration
option FEATURE_LONG_PATHS, which is not enabled by default.
win32: add support for /dev/std{in,out,err}2026-02-02T15:53:01+00:00Ron Yorstonrmy@pobox.com2026-02-02T15:53:01+00:00urn:sha1:8e6a6312552343aec7f5cde795ef0a11ef83b8ff
Allow applets to open the "files" /dev/stdin, /dev/stdout and
/dev/stderr. The 'stat' and 'ls' applets pretend they exist.
Adds 48-56 bytes.
win32: avoid failure when localtime() argument is out of range2025-11-26T12:56:11+00:00Ron Yorstonrmy@pobox.com2025-11-26T12:56:11+00:00urn:sha1:3b2f7ff1e0733c8224d0c6a0632abbbb87e8db91
The implementation of localtime(3) in the Microsoft Windows
runtime only accepts arguments between the Unix epoch (1970)
and either 2038 or 3000 for 32-bit or 64-bit systems respectively.
For values outside those limits it returns a NULL pointer.
Unfortunately, upstream BusyBox hardly ever bothers to check the
return value. Thus, when a call to stat(2) returned an all-zero
FILETIME for a file, the 'stat' applet failed. An all-zero FILETIME
represents a date in 1600, which is clearly before the Unix epoch.
Add a wrapper to localtime(3) which detects an out-of-range value
and returns a valid 'struct tm' for the Unix epoch. This is easier
than adding checks on the return value of every call to localtime(3).
Adds 32-48 bytes.
(GitHub issue #548)
mkdir: correctly report directory creation2025-11-22T09:22:28+00:00Ron Yorstonrmy@pobox.com2025-11-22T09:22:28+00:00urn:sha1:18ad143f86ded661ae4d2bef0e3a36490e786963
It was found that 'mkdir -p --verbose C:/' incorrectly reported
that 'C:/' was created.
Commit 0e0b5e9ff8 (mingw.c: ignore EACCES from mkdir if directory
exists) fixed a failure to create directories but caused the
`mkdir` applet to issue the wrong diagnostic.
The underlying problem is in the Windows runtime implementation
of _mkdir(): it can return the wrong errno in some cases, EACCES
instead of EEXIST.
Having the mkdir(2) wrapper return the correct errno should fix
both the directory creation and verbose diagnostic problems.
The website referenced in the previous commit is no longer
available. archive.org has a copy:
https://web.archive.org/web/20150224075238/http://www.apijunkie.com/APIJunkie/blog/post/2009/12/22/_mkdir-C-runtime-library-function-might-return-unexpected-error-values.aspx
(GitHub issue #546)
win32: allow use of /dev/tty2025-11-10T11:33:33+00:00Ron Yorstonrmy@pobox.com2025-11-10T11:33:33+00:00urn:sha1:f53dbcb8edbcfdad1721d0f5c9e8a16d54e983dc
Treat /dev/tty as an alias for Windows' 'con' device. The code
is similar to that used for /dev/null.
Adds 24-48 bytes.
(GitHub issue #538)
win32: use RtlGenRandom for /dev/urandom2025-10-09T06:49:58+00:00Ron Yorstonrmy@pobox.com2025-10-09T06:49:58+00:00urn:sha1:255e7ea4e2a0e3d28c0abf2750f42713eff711d7
Use the (somewhat ancient) Microsoft RtlGenRandom() function to
provide random data for /dev/urandom.
Saves 176-240 bytes.
(GitHub issue #519)
win32: use correct errno for fopen() of directory2025-09-19T12:53:35+00:00Ron Yorstonrmy@pobox.com2025-09-19T12:53:35+00:00urn:sha1:352bc560459d6dd24b3e6cb72f46ee8e37ba2efd
We already fixed up errno when a directory was opened by open().
Do the same for fopen(). This allows grep to give a more useful
error message when it's asked to open a directory.
Adds 64 bytes.
(GitHub issue #521)
win32: deduplicate die_if_error()2025-07-11T10:47:56+00:00Ron Yorstonrmy@pobox.com2025-07-11T10:47:56+00:00urn:sha1:b3ad13290344c2f40dc5bdc6053cc3cc73acfd9c
There were two copies of the static function die_if_error().
Replace these with a single external function.
Saves 16 bytes.
win32: retry when command needs elevated privileges2025-02-03T11:55:28+00:00Ron Yorstonrmy@pobox.com2025-02-03T11:55:28+00:00urn:sha1:14ccc45d548c9dfa73594f155e920c83e2882081
Some installer programs have an entry in their manifest to indicate
that they need elevated privileges. The shell in busybox-w32 was
unable to run such programs.
When a program fails to run with ERROR_ELEVATION_REQUIRED, try
again using ShellExecuteEx() with the 'runas' verb to give it
elevated privileges.
Adds 272-288 bytes.
(GitHub issue #481)
ash: strip trailing slash from directory if necessary2024-12-29T10:56:48+00:00Ron Yorstonrmy@pobox.com2024-12-29T10:56:48+00:00urn:sha1:c5e5da5eb1e0f6acee26bc22d2f567406a2840bc
The previous commit removed trailing dots and spaces from the last
component of a pathname when changing directory. If the result has
a trailing slash remove that too. But not if it's a drive root,
to avoid 'cd C:/' showing a current directory of 'C:'.
Adds 48 bytes.
(GitHub issue #478)