Fix bug #9311 with loading on MS-Windows .elc files in root directories.

 src/lread.c (Fload) [DOS_NT]: If `openp' returns -2, but the file
 has no `load' handler, try opening the file locally.

diff --git a/src/ChangeLog b/src/ChangeLog
index ac9864f..2aa0e15 100644 (file)
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2011-08-17  Eli Zaretskii  <eliz@gnu.org>
+
+       * lread.c (Fload) [DOS_NT]: If `openp' returns -2, but the file
+       has no `load' handler, try opening the file locally.  (Bug#9311)
+
 2011-08-16  Ken Brown  <kbrown@cornell.edu>
 
        * gmalloc.c: Expand comment.

diff --git a/src/lread.c b/src/lread.c
index 78ff195..6d1a7b1 100644 (file)
--- a/src/lread.c
+++ b/src/lread.c
@@ -1124,6 +1124,22 @@ Return t if the file exists and loads successfully.  */)
        handler = Ffind_file_name_handler (found, Qload);
       if (! NILP (handler))
        return call5 (handler, Qload, found, noerror, nomessage, Qt);
+#ifdef DOS_NT
+      /* Tramp has to deal with semi-broken packages that prepend
+        drive letters to remote files.  For that reason, Tramp
+        catches file operations that test for file existence, which
+        makes openp think X:/foo.elc files are remote.  However,
+        Tramp does not catch `load' operations for such files, so we
+        end up with a nil as the `load' handler above.  If we would
+        continue with fd = -2, we will behave wrongly, and in
+        particular try reading a .elc file in the "rt" mode instead
+        of "rb".  See bug #9311 for the results.  To work around
+        this, we try to open the file locally, and go with that if it
+        succeeds.  */
+      fd = emacs_open (SSDATA (ENCODE_FILE (found)), O_RDONLY, 0);
+      if (fd == -1)
+       fd = -2;
+#endif
     }
 
   /* Check if we're stuck in a recursive load cycle.
@@ -1247,9 +1263,17 @@ Return t if the file exists and loads successfully.  */)
   GCPRO3 (file, found, hist_file_name);
 
 #ifdef WINDOWSNT
-  emacs_close (fd);
   efound = ENCODE_FILE (found);
-  stream = fopen (SSDATA (efound), fmode);
+  /* If we somehow got here with fd == -2, meaning the file is deemed
+     to be remote, don't even try to reopen the file locally; just
+     force a failure instead.  */
+  if (fd >= 0)
+    {
+      emacs_close (fd);
+      stream = fopen (SSDATA (efound), fmode);
+    }
+  else
+    stream = NULL;
 #else  /* not WINDOWSNT */
   stream = fdopen (fd, fmode);
 #endif /* not WINDOWSNT */