[PATCH resend 1/2] ntdll: Allow renaming a file/directory to a different capitalization of itself.

[Gabriel Ivăncescu]

Renaming a file or directory from e.g. foobar to FooBar (or any other
caps-only change) should work and capitalize it, like on Windows, instead
of being a no-op.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=46203
Signed-off-by: Gabriel Ivăncescu 
---
 dlls/ntdll/unix/file.c | 48 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 46 insertions(+), 2 deletions(-)

diff --git a/dlls/ntdll/unix/file.c b/dlls/ntdll/unix/file.c
index afb552b..639ea6c 100644
--- a/dlls/ntdll/unix/file.c
+++ b/dlls/ntdll/unix/file.c
@@ -4326,9 +4326,10 @@ NTSTATUS WINAPI NtSetInformationFile( HANDLE handle, IO_STATUS_BLOCK *io,
         if (len >= sizeof(FILE_RENAME_INFORMATION))
         {
             FILE_RENAME_INFORMATION *info = ptr;
+            char *unix_name, *src_unix;
             UNICODE_STRING name_str;
             OBJECT_ATTRIBUTES attr;
-            char *unix_name;
+            size_t unix_name_len;

name_str.Buffer = info->FileName;
             name_str.Length = info->FileNameLength;
@@ -4343,13 +4344,56 @@ NTSTATUS WINAPI NtSetInformationFile( HANDLE handle, IO_STATUS_BLOCK *io,
             if (io->u.Status != STATUS_SUCCESS && io->u.Status != STATUS_NO_SUCH_FILE)
                 break;

+            unix_name_len = strlen(unix_name);
+
+            /* When it's renaming to the same file, preserve the case sensitivity of the last
+               component, so that renaming a\b\c\foobar to a\b\c\Foobar works correctly. */
+            if (io->u.Status != STATUS_NO_SUCH_FILE && !server_get_unix_name(handle, &src_unix))
+            {
+                char *name = realpath(unix_name, NULL);
+
+                if (name && !strcmp(name, src_unix))
+                {
+                    size_t nt_filename_len, pathlen;
+                    const WCHAR *nt_filename;
+                    char *tmp;
+                    INT maxsz;
+
+                    for (pathlen = name_str.Length / sizeof(WCHAR); pathlen; pathlen--)
+                        if (name_str.Buffer[pathlen - 1] == '\')
+                            break;
+
+                    nt_filename     = name_str.Buffer + pathlen;
+                    nt_filename_len = name_str.Length / sizeof(WCHAR) - pathlen;
+
+                    /* Build it from path + filename (the latter converted from nt_filename) */
+                    for (pathlen = unix_name_len; pathlen; pathlen--)
+                        if (unix_name[pathlen - 1] == '/')
+                            break;
+
+                    tmp = unix_name;
+                    maxsz = pathlen + nt_filename_len * 3 + 1;
+                    if (unix_name_len + 1 < maxsz) tmp = realloc(tmp, maxsz);
+                    if (tmp)
+                    {
+                        unix_name = tmp;
+                        unix_name_len = pathlen;
+                        unix_name_len += ntdll_wcstoumbs(nt_filename, nt_filename_len,
+                                                         unix_name + pathlen, maxsz - pathlen, TRUE);
+                        unix_name[unix_name_len] = '\0';
+                    }
+                }
+                free(src_unix);
+                free(name);
+            }
+
             SERVER_START_REQ( set_fd_name_info )
             {
                 req->handle   = wine_server_obj_handle( handle );
                 req->rootdir  = wine_server_obj_handle( attr.RootDirectory );
                 req->link     = FALSE;
                 req->replace  = info->ReplaceIfExists;
-                wine_server_add_data( req, unix_name, strlen(unix_name) );
+                wine_server_add_data( req, unix_name, unix_name_len );
                 io->u.Status = wine_server_call( req );
             }
             SERVER_END_REQ;