麻烦高手们帮我看看这段串口接收部分有没有存在导致溢出错误的部分

UINT ComReceiveProc(LPVOID lpParam)
{
char buf2[100], buf1[100];
unsigned char buf3[50];
int len,len0;
int i,j,m;
unsigned int iCode;
static bool bOrder;

bOrder=FALSE;
m=0;

   while (m_bSend)
{
wait:       len0=sio_iqueue(iPort);

if (len0<100)
{
Sleep(50);
goto wait;
}

if (bOrder)
{
sio_read( iPort, buf1, 65);
for (i=0;i<40;i++)
buf2[i]=buf1[25+i];
}
else
{
loop1: sio_read( iPort,buf1,35);
for (i=0;i<30;i++)
{  
if (buf1[i+0]==(char)0x1b && buf1[i+1]==(char) 0x05
&& buf1[i+2]==(char)0x00 && buf1[i+3]==(char)0x00
&& buf1[i+4]==(char)0x00)
{
for (j=0;j<35-i;j++)
   buf2[j]=buf1[j+i];
sio_read(iPort,&buf2[35-i],40-(35-i));
bOrder=TRUE;
goto loop2;
break;
}

}
Sleep (50);
goto loop1;
}

loop2:      if (buf2[7]==(char)0x24 && buf2[8]==(char) 0x01)
{

for (i=0;i<38;i++)
buf3[i]=(unsigned char) buf2[i];

iCode=0xffff;

for (i=0;i<38;i++)
iCode=CRC1(iCode,*(buf3+i));

}
else if (buf2[5]==0x05)
{
               len=sio_read(iPort,buf1,28);
goto wait;
}
else
{
bOrder=FALSE;                
sio_flush(iPort,0);
goto loop1;
}
             
if (*(buf2+38)==(char)(iCode&0x00ff) &&
*(buf2+39)==(char)(iCode>>8))
{

for (i=0;i<7;i++)
{
                    buf1[i*4]=buf2[i*4+9+3];
buf1[i*4+1]=buf2[i*4+9+2];
buf1[i*4+2]=buf2[i*4+9+1];
buf1[i*4+3]=buf2[i*4+9];
}

if(*(buf2+5)==01)
{
memcpy(a1,buf1,28);
a5[0]=a1[2];
}
if(*(buf2+5)==02)
{
memcpy(a2,buf1,28);
a5[1]=a2[2];
}
if(*(buf2+5)==03)
{
memcpy(a3,buf1,28);
a5[2]=a3[2];
}
if(*(buf2+5)==04)
{
memcpy(a4,buf1,28);
a5[3]=a4[2];
}
bOrder=TRUE;
}
else
{  
bOrder=FALSE;                
sio_flush(iPort,0);
}

Sleep(50);
}
return 0;
}