Move line-number-at-pos to C

* doc/lispref/positions.texi (Text Lines): Revert previous change.

* lisp/simple.el (line-number-at-pos): Remove definition.

* lisp/simple.el (count-lines): Revert back to using
`forward-line', because there seems to be a disagreement on how
lines should be counted in a region...

* src/fns.c (Fline_number_at_pos): Rename from
Fline_number_at_position and adjust parameter list.

1 files changed, 8 insertions, 10 deletions

diff --git a/doc/lispref/positions.texi b/doc/lispref/positions.texi
index 9adce21baec..dc0c7442d8d 100644
--- a/doc/lispref/positions.texi
+++ b/doc/lispref/positions.texi
@@ -437,18 +437,16 @@ prints a message reporting the number of lines, words, and characters
 in the buffer, or in the region if the region is active.
 @end deffn
 
-@defun line-number-at-position pos
-This function returns the line number in the current buffer
-corresponding to the buffer position @var{pos}.  If narrowing is in
-effect, this is the line number in the visible part of the buffer.
-@end defun
-
 @defun line-number-at-pos &optional pos absolute
 @cindex line number
-This function is like @code{line-number-at-position}, but if @var{pos}
-is @code{nil} or omitted, the current buffer position is used.  In
-addition, if @var{absolute} is non-@code{nil}, ignore any narrowing
-and return the absolute line number.
+This function returns the line number in the current buffer
+corresponding to the buffer position @var{pos}.  If @var{pos} is
+@code{nil} or omitted, the current buffer position is used. If
+@var{absolute} is @code{nil}, the default, counting starts at
+@code{(point-min)}, so the value refers to the contents of the
+accessible portion of the (potentially narrowed) buffer.  If
+@var{absolute} is non-@code{nil}, ignore any narrowing and return
+the absolute line number.
 @end defun
 
 @ignore