[COMMITTED] ada: Fix Ada.Directories.Modification_Time on Windows

[COMMITTED] ada: Fix Ada.Directories.Modification_Time on Windows

[Marc Poulhiès]

From: Ronan Desplanques <desplanques@adacore.com>

Before this patch, Ada.Directories.Modification_Time called
GetFileAttributesExA under the hood on Windows. That would sometimes
fail to work with files whose names were non-ASCII.

This patch replaces the call to GetFileAttributesExA with a call to
GetFileAttributesEx preceded by an encoding scheme conversion, as is
done in other functions of the run-time library. This fixes the issues
that were observed with the previous implementations.

gcc/ada/

	* adaint.c (__gnat_file_time): Fix Windows version.

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/ada/adaint.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/gcc/ada/adaint.c b/gcc/ada/adaint.c
index 2a193efc002..bb4ed2607e5 100644
--- a/gcc/ada/adaint.c
+++ b/gcc/ada/adaint.c
@@ -1507,7 +1507,16 @@ extern long long __gnat_file_time(char* name)
     long long ll_time;
   } t_write;
 
-  if (!GetFileAttributesExA(name, GetFileExInfoStandard, &fad)) {
+  TCHAR wname [GNAT_MAX_PATH_LEN + 2];
+  int name_len;
+
+  S2WSC (wname, name, GNAT_MAX_PATH_LEN + 2);
+  name_len = _tcslen (wname);
+
+  if (name_len > GNAT_MAX_PATH_LEN)
+    return LLONG_MIN;
+
+  if (!GetFileAttributesEx(wname, GetFileExInfoStandard, &fad)) {
     return LLONG_MIN;
   }
 
-- 
2.42.0