/*
 * Functions for constructing outgoing SIP messages.
 */

#include <stdio.h>
#include <string.h>
#include <strings.h>

#include "out_msg.h"

start_request_out_msg(msg, method, uri)
	struct sip_msg_out *msg;
	char *method, *uri;
{
	unsigned len;

	len = strlen(method) + strlen(uri) + (2 + 7 + 2);
	if (len + 2 > MAX_SIP_TX_PACKET)
		return(-1);
	sprintf(msg->buf, "%s %s SIP/2.0\r\n", method, uri);
	msg->msg_len = len;
	return(0);
}

start_response_out_msg(msg, status)
	struct sip_msg_out *msg;
	char *status;
{
	unsigned len;

	len = strlen(status) + (8 + 2);
	if (len + 2 > MAX_SIP_TX_PACKET)
		return(-1);
	sprintf(msg->buf, "SIP/2.0 %s\r\n", status);
	msg->msg_len = len;
	return(0);
}

out_msg_add_header(msg, name, value)
	struct sip_msg_out *msg;
	char *name, *value;
{
	unsigned len;

	len = strlen(name) + strlen(value) + 4;
	if (msg->msg_len + len + 2 > MAX_SIP_TX_PACKET)
		return(-1);
	sprintf(msg->buf + msg->msg_len, "%s: %s\r\n", name, value);
	msg->msg_len += len;
	return(0);
}

out_msg_finish(msg)
	struct sip_msg_out *msg;
{
	msg->buf[msg->msg_len++] = '\r';
	msg->buf[msg->msg_len++] = '\n';
	return(0);
}

out_msg_finish_body(msg, body, bodylen)
	struct sip_msg_out *msg;
	char *body;
	unsigned bodylen;
{
	msg->buf[msg->msg_len++] = '\r';
	msg->buf[msg->msg_len++] = '\n';
	if (msg->msg_len + bodylen > MAX_SIP_TX_PACKET)
		return(-1);
	bcopy(body, msg->buf + msg->msg_len, bodylen);
	msg->msg_len += bodylen;
	return(0);
}