void vi_buf_ins_begin(struct vi_buffer *vb, vi_motion mot);
void vi_buf_insert(struct vi_buffer *vb, char *s);
void vi_buf_ins_end(struct vi_buffer *vb);
void vi_buf_ins_begin(struct vi_buffer *vb, vi_motion mot);
void vi_buf_insert(struct vi_buffer *vb, char *s);
void vi_buf_ins_end(struct vi_buffer *vb);