308         size_t write_offset;  in bio_write()  local
313         write_offset = b->offset + b->len;  in bio_write()
314         if (write_offset >= b->size)  in bio_write()
315             write_offset -= b->size;  in bio_write()
318         if (write_offset + rest <= b->size)  in bio_write()
322             chunk = b->size - write_offset;  in bio_write()
324         memcpy(b->buf + write_offset, buf, chunk);  in bio_write()
349     size_t write_offset;  in bio_nwrite0()  local
375     write_offset = b->offset + b->len;  in bio_nwrite0()
376     if (write_offset >= b->size)  in bio_nwrite0()
377         write_offset -= b->size;  in bio_nwrite0()
378     if (write_offset + num > b->size)  in bio_nwrite0()
384         num = b->size - write_offset;  in bio_nwrite0()
387         *buf = b->buf + write_offset;  in bio_nwrite0()
388     assert(write_offset + num <= b->size);  in bio_nwrite0()