* buffer.h (PTR_BYTE_POS): Don't assume a byte count fits in 'unsigned'.

2 files changed, 3 insertions, 1 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 1929638a442..f3ed5f66161 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,7 @@
 2011-06-09  Paul Eggert  <eggert@cs.ucla.edu>
 
+        * buffer.h (PTR_BYTE_POS): Don't assume a byte count fits in 'unsigned'.
+
         * buffer.c (Fgenerate_new_buffer_name): Use EMACS_INT for count, not int.
         (advance_to_char_boundary): Return EMACS_INT, not int.
 
diff --git a/src/buffer.h b/src/buffer.h
index 3c91bdfe570..ba48a8105a2 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -337,7 +337,7 @@ while (0)
 
 #define PTR_BYTE_POS(ptr) \
 ((ptr) - (current_buffer)->text->beg                                        \
- - (ptr - (current_buffer)->text->beg <= (unsigned) (GPT_BYTE - BEG_BYTE) ? 0 : GAP_SIZE) \
+ - (ptr - (current_buffer)->text->beg <= (size_t) (GPT_BYTE - BEG_BYTE) ? 0 : GAP_SIZE)                                                 \
  + BEG_BYTE)
 
 /* Return character at byte position POS.  */