BEG_LIMIT and END_LIMIT serve to limit the ranged of the returned
results; they do not effect boundary behavior.
- If MERGE_AT_BOUNDARY is nonzero, then if POS is at the very last
- position of a field, then the end of the next field is returned
- instead of the end of POS's field (since the end of a field is
- actually also the beginning of the next input field, this behavior
- is sometimes useful). Additionally in the MERGE_AT_BOUNDARY
+ If MERGE_AT_BOUNDARY is nonzero, then if POS is at the very first
+ position of a field, then the beginning of the previous field is
+ returned instead of the beginning of POS's field (since the end of a
+ field is actually also the beginning of the next input field, this
+ behavior is sometimes useful). Additionally in the MERGE_AT_BOUNDARY
true case, if two fields are separated by a field with the special
value `boundary', and POS lies within it, then the two separated
fields are considered to be adjacent, and POS between them, when
- finding the beginning and ending of the "merged" field. */
+ finding the beginning and ending of the "merged" field.
+
+ Either BEG or END may be 0, in which case the corresponding value
+ is not stored. */
static void
find_field (pos, merge_at_boundary, beg_limit, beg, end_limit, end)
(pos, escape_from_edge, limit)
Lisp_Object pos, escape_from_edge, limit;
{
- int beg, end;
- find_field (pos, escape_from_edge, limit, &beg, Qnil, &end);
- /* When pos is at a field boundary and escape_from_edge (merge_at_boundary)
- is nil, find_field returns the *previous* field. In this case we return
- end instead of beg. */
- return make_number (NILP (escape_from_edge)
- && XFASTINT (pos) == end
- && end != ZV ? end : beg);
+ int beg;
+ find_field (pos, escape_from_edge, limit, &beg, Qnil, 0);
+ return make_number (beg);
}
DEFUN ("field-end", Ffield_end, Sfield_end, 0, 3, 0,