tell()
Returns the current offset (in bytes) of the current file in ARGF.
ARGF.pos #=> 0 ARGF.gets #=> "This is line one\n" ARGF.pos #=> 17
static VALUE argf_tell(VALUE argf) { if (!next_argv()) { rb_raise(rb_eArgError, "no stream to tell"); } ARGF_FORWARD(0, 0); return rb_io_tell(ARGF.current_file); }