#define smb_offset(p,buf) (PTR_DIFF(p,buf+4) + chain_size)
#define smb_len(buf) (PVAL(buf,3)|(PVAL(buf,2)<<8)|((PVAL(buf,1)&1)<<16))
-#define _smb_setlen(buf,len) buf[0] = 0; buf[1] = (len&0x10000)>>16; \
- buf[2] = (len&0xFF00)>>8; buf[3] = len&0xFF;
+#define _smb_setlen(buf,len) do { buf[0] = 0; buf[1] = (len&0x10000)>>16; \
+ buf[2] = (len&0xFF00)>>8; buf[3] = len&0xFF; } while (0)
/*******************************************************************
find the difference in milliseconds between two struct timeval