31   size_t begin;        /* Offset of the first byte to read. */  member
39   f->end = f->begin = 0;  in fifo_clear()
46   if (f->begin == f->end)  in fifo_reserve()
56     if (f->begin > FIFO_MIN) {  in fifo_reserve()
57       memmove(f->data, f->data + f->begin, f->end - f->begin);  in fifo_reserve()
58       f->end -= f->begin;  in fifo_reserve()
59       f->begin = 0;  in fifo_reserve()
78   f->end = f->begin + n;  in fifo_trim_to()
89   return (f->end - f->begin) / f->item_size;  in fifo_occupancy()
94   char * ret = f->data + f->begin;  in fifo_read()
96   if (n > (FIFO_SIZE_T)(f->end - f->begin))  in fifo_read()
100   f->begin += n;  in fifo_read()