310         size_t write_offset;  in bio_write()  local
315         write_offset = b->offset + b->len;  in bio_write()
316         if (write_offset >= b->size)  in bio_write()
317             write_offset -= b->size;  in bio_write()
320         if (write_offset + rest <= b->size)  in bio_write()
324             chunk = b->size - write_offset;  in bio_write()
326         memcpy(b->buf + write_offset, buf, chunk);  in bio_write()
351     size_t write_offset;  in bio_nwrite0()  local
377     write_offset = b->offset + b->len;  in bio_nwrite0()
378     if (write_offset >= b->size)  in bio_nwrite0()
379         write_offset -= b->size;  in bio_nwrite0()
380     if (write_offset + num > b->size)  in bio_nwrite0()
386         num = b->size - write_offset;  in bio_nwrite0()
389         *buf = b->buf + write_offset;  in bio_nwrite0()
390     assert(write_offset + num <= b->size);  in bio_nwrite0()