Convenient macro to check whether the buffer is live.

[bpt/emacs.git] / src / buffer.h

diff --git a/src/buffer.h b/src/buffer.h
index 3acf142..d18ef30 100644 (file)
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -959,7 +959,10 @@ bset_width_table (struct buffer *b, Lisp_Object val)
   b->INTERNAL_FIELD (width_table) = val;
 }
 
-\f
+/* Convenient check whether buffer B is live.  */
+
+#define BUFFER_LIVE_P(b) (!NILP (BVAR (b, name)))
+
 /* Chain of all buffers, including killed ones.  */
 
 extern struct buffer *all_buffers;
@@ -1149,7 +1152,7 @@ BUF_FETCH_MULTIBYTE_CHAR (struct buffer *buf, ptrdiff_t pos)
    We assume you know which buffer it's pointing into.  */
 
 #define OVERLAY_POSITION(P) \
- (MARKERP (P) ? marker_position (P) : (abort (), 0))
+ (MARKERP (P) ? marker_position (P) : (emacs_abort (), 0))
 
 \f
 /***********************************************************************
@@ -1189,7 +1192,7 @@ extern int last_per_buffer_idx;
 
 #define PER_BUFFER_VALUE_P(B, IDX)             \
     (((IDX) < 0 || IDX >= last_per_buffer_idx) \
-     ? (abort (), 0)                           \
+     ? (emacs_abort (), 0)                     \
      : ((B)->local_flags[IDX] != 0))
 
 /* Set whether per-buffer variable with index IDX has a buffer-local
@@ -1198,7 +1201,7 @@ extern int last_per_buffer_idx;
 #define SET_PER_BUFFER_VALUE_P(B, IDX, VAL)    \
      do {                                              \
        if ((IDX) < 0 || (IDX) >= last_per_buffer_idx)  \
-        abort ();                                      \
+        emacs_abort ();                                \
        (B)->local_flags[IDX] = (VAL);                  \
      } while (0)