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WebSVN – planix.SVN – Blame – /os/branches/planix-v0/sys/src/cmd/ip/snoopy/cec.c – Rev 2

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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{
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	uchar	type;
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	uchar	conn;
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	uchar	seq;
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	uchar	len;
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}Hdr;
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enum{
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	Hsize	= 4,
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};
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enum{
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	Otype,
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	Oconn,
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	Oseq,
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	Olen,
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};
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static Field p_fields[] =
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{
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	{"type",	Fnum,	Otype,		"type",	},
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	{"conn",	Fnum,	Oconn,		"conn",	},
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	{"seq",		Fnum,	Oseq,		"seq",	},
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	{"len",		Fnum,	Olen,		"len",	},
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	{0}
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};
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static void
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p_compile(Filter *f)
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{
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	if(f->op == '='){
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		compile_cmp(aoe.name, f, p_fields);
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		return;
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	}
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	sysfatal("unknown aoe field: %s", f->s);
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}
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static int
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p_filter(Filter *f, Msg *m)
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{
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	Hdr *h;
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	if(m->pe - m->ps < Hsize)
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		return 0;
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	h = (Hdr*)m->ps;
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	m->ps += Hsize;
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	switch(f->subop){
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	case Otype:
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		return h->type == f->ulv;
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	case Oconn:
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		return h->conn = f->ulv;
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	case Oseq:
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		return h->seq = f->ulv;
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	case Olen:
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		return h->len = f->ulv;
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	}
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	return 0;
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}
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static char* ttab[] = {
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	"Tinita",
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	"Tinitb",
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	"Tinitc",
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	"Tdata",
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	"Tack",
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	"Tdiscover",
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	"Toffer",
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	"Treset",
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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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	char *s, *p, buf[4];
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	Hdr *h;
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	if(m->pe - m->ps < Hsize)
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		return 0;
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	h = (Hdr*)m->ps;
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	m->ps += Hsize;
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	m->pr = nil;
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	if(h->type < nelem(ttab))
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		s = ttab[h->type];
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	else{
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		snprint(buf, sizeof buf, "%d", h->type);
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		s = buf;
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	}
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	p = (char*)m->ps;
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	m->p = seprint(m->p, m->e, "type=%s conn=%d seq=%d len=%d %.*s",
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		s, h->conn, h->seq, h->len,
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		(int)utfnlen(p, h->len), p);
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	return 0;
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}
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Proto cec =
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{
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	"cec",
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	p_compile,
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	p_filter,
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	p_seprint,
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	nil,
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	nil,
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	p_fields,
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	defaultframer,
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};