jump_loc
jump_loc(pos, jump_sline);
jump_loc(pos, jump_sline);
jump_loc(ch_zero(), 1);
jump_loc(initial_scrpos.pos, initial_scrpos.ln);
void jump_loc(off_t, int);
jump_loc(scrpos.pos, scrpos.ln);
jump_loc(pos, sline);
jump_loc(0, sc_height-1);
jump_loc(pos, sc_height-1);
jump_loc(pos, jump_sline);
jump_loc(ch_tell(), jump_sline);
jump_loc(scrpos.pos, scrpos.ln);
jump_loc(pos, jump_sline);
jump_loc(pos, jump_sline);