fseek(f->fp, index * b->blk_size, SEEK_SET);
return (fwrite(f->b.priv.buf, 1, b->blk_size, f->fp) == b->blk_size) ? 0 : EOF;
}
fseek(f->fp, index * b->blk_size, SEEK_SET);
return (fwrite(f->b.priv.buf, 1, b->blk_size, f->fp) == b->blk_size) ? 0 : EOF;
}