98 packetcopy(Packet *p, uchar *buf, int offset, int n)  in packetcopy()  argument
101 	if(offset < 0 || n < 0)  in packetcopy()
103 	if(offset > p->len)  in packetcopy()
105 	if(offset+n > p->len)  in packetcopy()
106 		n = p->len - offset;  in packetcopy()
107 	memmove(buf, p->data+offset, n);  in packetcopy()
112 packetdup(Packet *p, int offset, int n)  in packetdup()  argument
117 	if(offset < 0 || n < 0)  in packetdup()
119 	if(offset > p->len)  in packetdup()
121 	if(offset+n > p->len)  in packetdup()
122 		n = p->len - offset;  in packetdup()
124 	packetappend(q, p->data+offset, n);  in packetdup()
144 packetfragments(Packet *p, IOchunk *io, int nio, int offset)  in packetfragments()  argument
147 	if(offset < 0)  in packetfragments()
152 	if(offset >= p->len)  in packetfragments()
154 	io[0].addr = p->data + offset;  in packetfragments()
155 	io[0].len = p->len - offset;  in packetfragments()
184 packetpeek(Packet *p, uchar *buf, int offset, int n)  in packetpeek()  argument
187 	if(offset < 0 || n < 0)  in packetpeek()
189 	if(offset+n > p->len)  in packetpeek()
191 	return p->data+offset;  in packetpeek()
254 packettrim(Packet *p, int offset, int n)  in packettrim()  argument
257 	if(offset < 0 || n < 0)  in packettrim()
259 	if(offset+n > p->len)  in packettrim()
261 	memmove(p->data+offset, p->data+offset+n, p->len-offset-n);  in packettrim()