New macro to iterate over all buffers, miscellaneous cleanups.

* lisp.h (all_buffers): Remove declaration.
* buffer.h (all_buffers): Add declaration, with comment.
(for_each_buffer): New macro.
* alloc.c (Fgarbage_collect, mark_object): Use it.
* buffer.c (Fkill_buffer, Fbuffer_swap_text, Fset_buffer_multibyte)
(init_buffer): Likewise.
* data.c (Fset_default): Likewise.
* coding.c (code_conversion_restore): Remove redundant check
for dead buffer.
* buffer.c (Fkill_buffer): Likewise.  Remove obsolete comment.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/buffer.h b/src/buffer.h
index 4003be5c8c4..8c596835fcc 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -857,6 +857,15 @@ struct buffer
 };
 
 
+/* Chain of all buffers, including killed ones.  */
+
+extern struct buffer *all_buffers;
+
+/* Used to iterate over the chain above.  */
+
+#define for_each_buffer(b) \
+  for ((b) = all_buffers; (b); (b) = (b)->header.next.buffer)
+
 /* This points to the current buffer.  */
 
 extern struct buffer *current_buffer;