lisp_string_width  492 src/character.c   XSETFASTINT (val, lisp_string_width (str, ifrom, ito, -1, NULL, NULL, true));
lisp_string_width  576 src/character.h extern ptrdiff_t lisp_string_width (Lisp_Object, ptrdiff_t, ptrdiff_t,
lisp_string_width 3729 src/editfns.c  		  width = lisp_string_width (arg, 0, nchars_string, prec,