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| author | Karsten Blees <karsten.blees@gmail.com> | 2026-01-09 20:05:10 +0000 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2026-01-09 18:32:55 -0800 |
| commit | 980852dbff657a14eecc4a8a72a2874dad2bad71 (patch) | |
| tree | 6c8b7dfae701fa6daec879c16babdadcc541391e /compat/mingw.c | |
| parent | 43745a7d55daa1aa0937a3c6e8b521bd026a31f1 (diff) | |
| download | git-980852dbff657a14eecc4a8a72a2874dad2bad71.tar.xz | |
mingw: implement `readlink()`
Implement `readlink()` by reading NTFS reparse points via the
`read_reparse_point()` function that was introduced earlier to determine
the length of symlink targets. Works for symlinks and directory
junctions.
Signed-off-by: Karsten Blees <karsten.blees@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'compat/mingw.c')
| -rw-r--r-- | compat/mingw.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/compat/mingw.c b/compat/mingw.c index 5d2a8c247c..b407a2ac07 100644 --- a/compat/mingw.c +++ b/compat/mingw.c @@ -2698,6 +2698,30 @@ int link(const char *oldpath, const char *newpath) return 0; } +int readlink(const char *path, char *buf, size_t bufsiz) +{ + WCHAR wpath[MAX_PATH]; + char tmpbuf[MAX_PATH]; + int len; + DWORD tag; + + if (xutftowcs_path(wpath, path) < 0) + return -1; + + if (read_reparse_point(wpath, TRUE, tmpbuf, &len, &tag) < 0) + return -1; + + /* + * Adapt to strange readlink() API: Copy up to bufsiz *bytes*, potentially + * cutting off a UTF-8 sequence. Insufficient bufsize is *not* a failure + * condition. There is no conversion function that produces invalid UTF-8, + * so convert to a (hopefully large enough) temporary buffer, then memcpy + * the requested number of bytes (including '\0' for robustness). + */ + memcpy(buf, tmpbuf, min(bufsiz, len + 1)); + return min(bufsiz, len); +} + pid_t waitpid(pid_t pid, int *status, int options) { HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION, |