[patch] a file on a UNC path becomes readonly.

[Ken Takata]

Hi,

After the patch 7.4.096, when edit and save a file on a UNC path, the file
becomes unexpectedly readonly.  mch_getperm() should return permissions in
a unix style like 0644 or 0777, but it returns Win32 attributes for a UNC
path after 7.4.096.  vim_stat() should have been changed to accept a UNC path.
Attached patch fixes this.

Regards,
Ken Takata

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# HG changeset patch
# Parent 55cd783bbc2d69a4baea9125ba53fa787aed3780

diff --git a/src/os_mswin.c b/src/os_mswin.c
--- a/src/os_mswin.c
+++ b/src/os_mswin.c
@@ -617,8 +617,20 @@
     p = buf + strlen(buf);
     if (p > buf)
 	mb_ptr_back(buf, p);
+    /* Remove trailing '\\' except root path. */
     if (p > buf && (*p == '\\' || *p == '/') && p[-1] != ':')
 	*p = NUL;
+    if ((buf[0] == '\\' && buf[1] == '\\') || (buf[0] == '/' && buf[1] == '/'))
+    {
+	/* UNC root path must be followed by '\\'. */
+	p = vim_strpbrk(buf + 2, "\\/");
+	if (p)
+	{
+	    p = vim_strpbrk(p + 1, "\\/");
+	    if (p == NULL)
+		STRCAT(buf, "\\");
+	}
+    }
 #ifdef FEAT_MBYTE
     if (enc_codepage >= 0 && (int)GetACP() != enc_codepage
 # ifdef __BORLANDC__
diff --git a/src/os_win32.c b/src/os_win32.c
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -2890,9 +2890,6 @@
     struct stat st;
     int		n;
 
-    if (name[0] == '\\' && name[1] == '\\')
-	/* UNC path */
-	return (long)win32_getattrs(name);
     n = mch_stat(name, &st);
     return n == 0 ? (long)st.st_mode : -1L;
 }