ch_zero
if (pos < ch_zero() || (len != -1 && pos > len))
if (ch_seek(ch_zero()) == 0)
jump_loc(ch_zero(), 1);
pos = ch_zero();
pos = ch_zero();
if (curr_pos == -1 || curr_pos <= ch_zero()) {
if (curr_pos == -1 || curr_pos <= ch_zero() || ch_seek(curr_pos - 1))
new_pos = ch_zero();
if (pos <= ch_zero())
return (ch_zero());
tpos = ch_zero();
m->m_scrpos.pos = ch_zero();
m->m_scrpos.pos = ch_zero();
if (len == -1 || len == ch_zero() ||
(len = ch_length()) == -1 || len == ch_zero() ||
pos = ch_zero();
pos = ch_zero();