VIM struct: buffheader_T

typedef struct buffblock  buffblock_T;
typedef struct buffheader buffheader_T;

struct buffheader
{
    buffblock_T  bh_first;      // first (dummy) block of list
    buffblock_T *bh_curr;       // buffblock for appending
    int          bh_index;      // index for reading
    int          bh_space;      // space in bh_curr for appending
};