[newlib-cygwin] Cygwin: utils: ldd: use GetFinalPathNameByHandleW

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=6462a0844db160b341a41bfb8c1083d3b9367042

commit 6462a0844db160b341a41bfb8c1083d3b9367042
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Thu May 20 23:07:05 2021 +0200

    Cygwin: utils: ldd: use GetFinalPathNameByHandleW
    
    drop replacement function GetFileNameFromHandle which was
    only required pre-Vista.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/utils/ldd.cc | 33 ++-------------------------------
 1 file changed, 2 insertions(+), 31 deletions(-)

diff --git a/winsup/utils/ldd.cc b/winsup/utils/ldd.cc
index 1e1863c1c..183e02cd4 100644
--- a/winsup/utils/ldd.cc
+++ b/winsup/utils/ldd.cc
@@ -56,7 +56,6 @@ struct option longopts[] =
 const char *opts = "dhruvV";
 
 static int process_file (const wchar_t *);
-static void *drive_map;
 
 static int
 error (const char *fmt, ...)
@@ -155,32 +154,6 @@ get_module_filename (HANDLE hp, HMODULE hm)
   return buf;
 }
 
-static BOOL
-GetFileNameFromHandle(HANDLE hFile, WCHAR pszFilename[MAX_PATH+1])
-{
-  BOOL result = FALSE;
-  ULONG len = 0;
-  OBJECT_NAME_INFORMATION *ntfn = (OBJECT_NAME_INFORMATION *) alloca (65536);
-  NTSTATUS status = NtQueryObject (hFile, ObjectNameInformation,
-                                   ntfn, 65536, &len);
-  if (NT_SUCCESS (status))
-    {
-      PWCHAR win32path = ntfn->Name.Buffer;
-      win32path[ntfn->Name.Length / sizeof (WCHAR)] = L'\0';
-
-      /* NtQueryObject returns a native NT path.  (Try to) convert to Win32. */
-      if (!drive_map)
-	 drive_map = (void *) cygwin_internal (CW_ALLOC_DRIVE_MAP);
-      if (drive_map)
-        win32path = (PWCHAR) cygwin_internal (CW_MAP_DRIVE_MAP, drive_map,
-                                              win32path);
-      pszFilename[0] = L'\0';
-      wcsncat (pszFilename, win32path, MAX_PATH);
-      result = TRUE;
-    }
-  return result;
-}
-
 static wchar_t *
 load_dll (const wchar_t *fn)
 {
@@ -288,8 +261,8 @@ print_dlls (dlls *dll, const wchar_t *dllfn, const wchar_t *process_fn)
       if (!fullpath)
 	{
 	  // if no path found yet, try getting it from an open handle to the DLL
-	  wchar_t dllname[MAX_PATH+1];
-	  if (GetFileNameFromHandle (dll->hFile, dllname))
+	  wchar_t dllname[PATH_MAX];
+	  if (GetFinalPathNameByHandleW (dll->hFile, dllname, PATH_MAX, 0))
 	    {
 	      fn = tocyg (dllname);
 	      saw_file (basename (fn));
@@ -465,8 +438,6 @@ main (int argc, char **argv)
   while ((fn = *argv++))
     if (report (fn, multiple))
       ret = 1;
-  if (drive_map)
-    cygwin_internal (CW_FREE_DRIVE_MAP, drive_map);
   exit (ret);
 }