_sseek
_sseek(fp, (fpos_t)0, SEEK_END);
_sseek(fp, (fpos_t)0, SEEK_SET);
_sseek(fp, (fpos_t)0, SEEK_END);
if (_sseek(fp, curoff, SEEK_SET) == POS_ERR)
(ret = _sseek(fp, (fpos_t)offset, whence)) == POS_ERR)
pos = _sseek(fp, (fpos_t)0, SEEK_CUR);
extern fpos_t _sseek(FILE *, fpos_t, int);
if (_sseek(fp, (fpos_t)0, SEEK_END) == -1 &&