#!/usr/local/bin/tcc -run
#include <string.h>
#include <stdio.h>

#define N_DBG_MAX (1024 * 6)

char bb_dbg_buf[N_DBG_MAX];
int cw_dbg_cnt, bw_dbg_rdptr;

int s_get_logsize ( int cnt )
{
    int	size;
    int	i;

    size = 0;

    for ( i = 0; i < 2; i++, cnt++ ) {
        if ( cnt >= N_DBG_MAX ) {
            cnt = 0;
        }

        size |= ( ( short int ) bb_dbg_buf[cnt] << ( i * 8 ) );
    }

    return size;
}

int s_get_termlog ( int no, int *rdpnt )
{
    int	pnt;
    int	size;
    int	ret;

    pnt = cw_dbg_cnt;

    do {

        if ( pnt < 2 ) {
            pnt = N_DBG_MAX - ( 2 - pnt );
        } else {
            pnt -= 2;
        }

        size = s_get_logsize ( pnt );
        if (  size == 0 ) {
            ret = 0;
            break;
        } else {
            ret = size;
        }

        if ( pnt < size ) {
            pnt = N_DBG_MAX - ( size - pnt );
        } else {
            pnt -= size;
        }

        *rdpnt = pnt;

    } while ( no-- > 0 );

    return ret;
}

void main(void)
{
    int i size;
    cw_dbg_cnt = 0;
    bw_dbg_rdptr = 0;
    for (i = 0; i < N_DBG_MAX / (3 + 6); i++) {
        bb_dbg_buf[i * 9 + 0] = 'A';
        bb_dbg_buf[i * 9 + 1] = 'B';
        bb_dbg_buf[i * 9 + 2] = 'C';
        bb_dbg_buf[i * 9 + 3] = 0;
        bb_dbg_buf[i * 9 + 4] = 0;
        bb_dbg_buf[i * 9 + 5] = 0;
        bb_dbg_buf[i * 9 + 6] = 0;
        bb_dbg_buf[i * 9 + 7] = 7;
        bb_dbg_buf[i * 9 + 8] = 0;
    }
    cw_dbg_cnt = i * 9;
    size = (N_DBG_MAX + cw_dbg_cnt - bw_dbg_rdptr) % N_DBG_MAX
    printf("%d\n", N_DBG_MAX - size);
}