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#include <u.h>
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#include <libc.h>
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#include <ip.h>
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#include "dat.h"
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#include "protos.h"
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typedef struct Hdr	Hdr;
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struct Hdr
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{
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	uchar	flags;
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	uchar	ln[4];	/* optional, present if L flag set*/
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};
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enum
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{
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	FLHDR=	1,	/* sizeof(flags) */
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	LNHDR=	4,	/* sizeof(ln) */
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};
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enum
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{
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	FlagL = 1<<7,
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	FlagM = 1<<6,
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	FlagS = 1<<5,
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	Version = (1<<2)|(1<<1)|(1<<0),
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};
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static Mux p_mux[] =
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{
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	{ "dump", 0, },
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	{ 0 }
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};
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static char*
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flags(int f)
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{
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	static char fl[20];
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	char *p;
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	p = fl;
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	if(f & FlagS)
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		*p++ = 'S';
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	if(f & FlagM)
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		*p++ = 'M';
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	if(f & FlagL)
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		*p++ = 'L';
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	*p = 0;
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	return fl;
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}
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static int
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p_seprint(Msg *m)
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{
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	Hdr *h;
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	if(m->pe - m->ps < FLHDR)
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		return -1;
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	h = (Hdr*)m->ps;
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	m->ps += FLHDR;
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	if (h->flags & FlagL) {
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		if(m->pe - m->ps < LNHDR)
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			return -1;
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		else
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			m->ps += LNHDR;
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	}
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	/* next protocol  depending on type*/
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	demux(p_mux, 0, 0, m, &dump);
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	m->p = seprint(m->p, m->e, "ver=%1d", h->flags & Version);
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	m->p = seprint(m->p, m->e, " fl=%s", flags(h->flags));
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	if (h->flags & FlagL)
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		m->p = seprint(m->p, m->e, " totallen=%1d", NetL(h->ln));
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	/* these are not in the header, just print them for our convenience */
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	m->p = seprint(m->p, m->e, " dataln=%1ld", m->pe - m->ps);
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	if ((h->flags & (FlagL|FlagS|FlagM)) == 0 && m->ps == m->pe)
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		m->p = seprint(m->p, m->e, " ack");
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	return 0;
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}
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Proto ttls =
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{
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	"ttls",
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	nil,
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	nil,
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	p_seprint,
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	p_mux, /* we need this to get the dump printed */
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	"%lud",
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	nil,
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	defaultframer,
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};