/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <ip.h>#include "dat.h"#include "protos.h" typedef struct Hdr	Hdr;struct Hdr{	uchar	flags;	uchar	ln[4];	/* optional, present if L flag set*/}; enum{	FLHDR=	1,	/* sizeof(flags) */	LNHDR=	4,	/* sizeof(ln) */}; enum{	FlagL = 1<<7, 	FlagM = 1<<6,	FlagS = 1<<5,	Version = (1<<2)|(1<<1)|(1<<0),}; static Mux p_mux[] ={	{ "dump", 0, },	{ 0 }}; static char*flags(int f){	static char fl[20];	char *p; 	p = fl;	if(f & FlagS)		*p++ = 'S';	if(f & FlagM)		*p++ = 'M';	if(f & FlagL)		*p++ = 'L';	*p = 0;	return fl;} static intp_seprint(Msg *m){	Hdr *h; 	if(m->pe - m->ps < FLHDR)		return -1; 	h = (Hdr*)m->ps;	m->ps += FLHDR; 	if (h->flags & FlagL) {		if(m->pe - m->ps < LNHDR)			return -1;		else			m->ps += LNHDR;	} 	/* next protocol  depending on type*/	demux(p_mux, 0, 0, m, &dump); 	m->p = seprint(m->p, m->e, "ver=%1d", h->flags & Version);	m->p = seprint(m->p, m->e, " fl=%s", flags(h->flags)); 	if (h->flags & FlagL)		m->p = seprint(m->p, m->e, " totallen=%1d", NetL(h->ln)); 	/* these are not in the header, just print them for our convenience */	m->p = seprint(m->p, m->e, " dataln=%1ld", m->pe - m->ps);	if ((h->flags & (FlagL|FlagS|FlagM)) == 0 && m->ps == m->pe)		m->p = seprint(m->p, m->e, " ack"); 	return 0;} Proto ttls ={	"ttls",	nil,	nil,	p_seprint,	p_mux, /* we need this to get the dump printed */	"%lud",	nil,	defaultframer,};