(BUF_PTR_CHAR_POS): New macro.

790f39e7 · Richard M. Stallman · dcdc526c · 790f39e7
Commit 790f39e7 authored Jun 25, 1994 by Richard M. Stallman
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src/buffer.h src/buffer.h +7 -0

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--- a/src/buffer.h
+++ b/src/buffer.h
@@ -130,6 +130,13 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 ((ptr) - (current_buffer)->text.beg					\
 - (ptr - (current_buffer)->text.beg < (unsigned) GPT ? 0 : GAP_SIZE)	\
 + 1)
+
+/* Convert the address of a char in the buffer into a character position.  */
+#define BUF_PTR_CHAR_POS(buf, ptr)			\
+((ptr) - (buf)->text.beg				\
+ - (ptr - (buf)->text.beg < (unsigned) BUF_GPT ((buf))	\
+    ? 0 : BUF_GAP_SIZE ((buf)))				\
+ + 1)

 struct buffer_text
  {