From a74b2ef0f17b300c7cdf2f0d45a2d78a6b4c52d8 Mon Sep 17 00:00:00 2001
From: Steve Lhomme <robux4@ycbcr.xyz>
Date: Tue, 16 May 2023 09:40:34 +0200
Subject: [PATCH 1/3] Use CreateFile2 in UWP builds

CreateFileA and CreateFileW are forbidden calls in UWP.
CreateFile2 is close enough, some parameters are passed in a structure
and it requires a WCHAR filename. Given the original stat uses the
"multibyte code page currently in use" [1], the char should be converted
using CP_ACP [2].

[1] https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/stat-functions
[2] https://learn.microsoft.com/en-us/windows/win32/api/stringapiset/nf-stringapiset-multibytetowidechar#parameters
---
 lib/spawni.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/stat.c   | 35 +++++++++++++++++++++++++++++++++++
 lib/utime.c  | 35 +++++++++++++++++++++++++++++++++++
 3 files changed, 120 insertions(+)

diff --git a/srclib/stat.c b/srclib/stat.c
index 7987e26583..d25f632967 100644
--- a/srclib/stat.c
+++ b/srclib/stat.c
@@ -197,6 +197,7 @@ rpl_stat (char const *name, struct stat *buf)
     {
       /* Approach based on the file.  */
 
+# if !(_WIN32_WINNT >= _WIN32_WINNT_WIN8)
       /* Open a handle to the file.
          CreateFile
          <https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-createfilea>
@@ -212,6 +213,40 @@ rpl_stat (char const *name, struct stat *buf)
                        filesystem operations.  */
                     FILE_FLAG_BACKUP_SEMANTICS /* | FILE_FLAG_POSIX_SEMANTICS */,
                     NULL);
+# else /* _WIN32_WINNT_WIN8 */
+      /* Only CreateFile2 is available in UWP builds.
+         <https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfile2>
+         <https://learn.microsoft.com/en-us/uwp/win32-and-com/win32-apis#apis-from-api-ms-win-core-file-l1-2-1dll>  */
+      HANDLE h = INVALID_HANDLE_VALUE;
+      int wlen = MultiByteToWideChar (CP_ACP, 0, rname, -1, NULL, 0);
+      if (wlen > 0)
+        {
+          WCHAR *wrname = malloca (wlen * sizeof (WCHAR));
+          if (wrname != NULL)
+            {
+              MultiByteToWideChar (CP_ACP, 0, rname, -1, wrname, wlen);
+
+              CREATEFILE2_EXTENDED_PARAMETERS createExParams;
+              createExParams.dwSize = sizeof(CREATEFILE2_EXTENDED_PARAMETERS);
+              createExParams.dwFileAttributes = FILE_ATTRIBUTE_NORMAL;
+              /* FILE_FLAG_POSIX_SEMANTICS (treat file names that differ only
+                  in case as different) makes sense only when applied to *all*
+                  filesystem operations.  */
+              createExParams.dwFileFlags = FILE_FLAG_BACKUP_SEMANTICS /* | FILE_FLAG_POSIX_SEMANTICS */;
+              createExParams.dwSecurityQosFlags = 0;
+              createExParams.lpSecurityAttributes = NULL;
+              createExParams.hTemplateFile = NULL;
+
+              h =
+                CreateFile2 (wrname,
+                             FILE_READ_ATTRIBUTES,
+                             FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+                             OPEN_EXISTING,
+                             &createExParams);
+              freea(wrname);
+            }
+        }
+# endif /* _WIN32_WINNT_WIN8 */
       if (h != INVALID_HANDLE_VALUE)
         {
           ret = _gl_fstat_by_handle (h, rname, buf);
-- 
2.37.3.windows.1