Merge from emacs--devo--0

Patches applied:

 * emacs--devo--0  (patch 781-792)

   - Update from CVS
   - Merge from gnus--rel--5.10
   - Merge from emacs--rel--22

 * emacs--rel--22  (patch 33-41)
 * gnus--rel--5.10  (patch 226-228)

   - Update from CVS

Revision: emacs@sv.gnu.org/emacs--multi-tty--0--patch-21

1 files changed, 7 insertions, 0 deletions

diff --git a/src/alloc.c b/src/alloc.c
index 574196059f8..cc6d1d55870 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -1759,6 +1759,8 @@ init_strings ()
   string_blocks = NULL;
   n_string_blocks = 0;
   string_free_list = NULL;
+  empty_unibyte_string = make_pure_string ("", 0, 0, 0);
+  empty_multibyte_string = make_pure_string ("", 0, 0, 1);
 }
 
 
@@ -2482,6 +2484,9 @@ make_uninit_string (length)
      int length;
 {
   Lisp_Object val;
+
+  if (!length)
+    return empty_unibyte_string;
   val = make_uninit_multibyte_string (length, length);
   STRING_SET_UNIBYTE (val);
   return val;
@@ -2500,6 +2505,8 @@ make_uninit_multibyte_string (nchars, nbytes)
 
   if (nchars < 0)
     abort ();
+  if (!nbytes)
+    return empty_multibyte_string;
 
   s = allocate_string ();
   allocate_string_data (s, nchars, nbytes);