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mingw: implement readlink()

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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. If symlinks are disabled, fail with `ENOSYS`.

Signed-off-by: Karsten Blees <blees@dcon.de>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Karsten Blees 2025-12-17 14:08:50 +00:00 committed by Junio C Hamano
parent 8a08d14d05
commit 1977e5b9de
2 changed files with 25 additions and 2 deletions
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3
compat/mingw-posix.h
View File

@ -121,8 +121,6 @@ struct utsname {
* trivial stubs
*/
static inline int readlink(const char *path UNUSED, char *buf UNUSED, size_t bufsiz UNUSED)
{ errno = ENOSYS; return -1; }
static inline int symlink(const char *oldpath UNUSED, const char *newpath UNUSED)
{ errno = ENOSYS; return -1; }
static inline int fchmod(int fildes UNUSED, mode_t mode UNUSED)
@ -197,6 +195,7 @@ int setitimer(int type, struct itimerval *in, struct itimerval *out);
int sigaction(int sig, struct sigaction *in, struct sigaction *out);
int link(const char *oldpath, const char *newpath);
int uname(struct utsname *buf);
int readlink(const char *path, char *buf, size_t bufsiz);
/*
* replacements of existing functions

24
compat/mingw.c
View File

@ -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,