fsetpos
int fsetpos(FILE *, const fpos_t *);
PROTO_NORMAL(fsetpos);
DEF_STRONG(fsetpos);
TEST_UNCHANGED(fgetpos(f, &pos); fsetpos(f, &pos));
|| fsetpos (wr->out, &(wr->th_ssize_pos)) != 0
|| fsetpos (wr->out, &pos)) {