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/*
* Copyright (c) 2026 Nakidai Perumenei <nakidai at disroot dot org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "ircd.h"
#include <stdarg.h>
#include <err.h>
#define ARG(n) const char *n = va_arg(ap, const char *)
#define M1(x, ...)
#define M2(x, ...) ARG(x); M1(__VA_ARGS__)
#define M3(x, ...) ARG(x); M2(__VA_ARGS__)
#define M4(x, ...) ARG(x); M3(__VA_ARGS__)
#define M5(x, ...) ARG(x); M4(__VA_ARGS__)
#define M6(x, ...) ARG(x); M5(__VA_ARGS__)
#define M7(x, ...) ARG(x); M6(__VA_ARGS__)
#define GET_M(_0,_1,_2,_3,_4,_5,_6,_7,NAME,...) NAME
#define ARGS(_0, ...) GET_M(_0,__VA_ARGS__,M7,M6,M5,M4,M3,M2,M1,M0,)(__VA_ARGS__,)
/*
* REPLY macro allows to write less boilerplate for each IRC reply
* For example,
* | REPLY(401, WRITE(
* | ":%s 401 %s %s :No such nick/channel",
* | hostname,
* | getnick(peer),
* | name
* | ), name, _);
* is unrolled into
* | {
* | const char *name = va_arg(ap, const char *);
* | return WRITE(
* | ":%s 401 %s %s :No such nick/channel",
* | hostname,
* | getnick(peer),
* | name
* | );
* | }
*
* Note the `_' argument, it's present as C doesn't support empty __VA_ARGS__
*/
#define REPLY(n, action, ...) case n: { ARGS(,__VA_ARGS__); return action; }
static int
vreply(const struct Peer *peer, int number, va_list ap)
{
switch (number)
{
#define WRITE(...) writef(peer->fd, __VA_ARGS__)
REPLY(1, WRITE(
":%s 001 %s Welcome to the Internet Relay Network %s!%s@%s",
hostname,
getnick(peer),
getnick(peer),
peer->user,
peer->host
), _);
REPLY(401, WRITE(
":%s 401 %s %s :No such nick/channel",
hostname,
getnick(peer),
name
), name, _);
REPLY(403, WRITE(
":%s 403 %s %s :No such channel",
hostname,
getnick(peer),
channel
), channel, _);
REPLY(405, WRITE(
":%s 405 %s %s :You have joined too many channels",
hostname,
getnick(peer),
channel
), channel, _);
REPLY(411, WRITE(
":%s 411 %s :No recipient given (PRIVMSG)",
hostname,
getnick(peer)
), _);
REPLY(412, WRITE(
":%s 412 %s :No text to send",
hostname,
getnick(peer)
), _);
REPLY(421, WRITE(
":%s 421 %s %s :Unknown command",
hostname,
getnick(peer),
command
), command, _);
REPLY(431, WRITE(
":%s 431 %s :No nickname given",
hostname,
getnick(peer)
), _);
REPLY(442, WRITE(
":%s 442 %s %s :You're not on that channel",
hostname,
getnick(peer),
channel
), channel, _);
REPLY(451, WRITE(
":%s 451 %s :You have not registered",
hostname,
getnick(peer)
), _);
REPLY(461, WRITE(
":%s 461 %s %s :Not enough parameters",
hostname,
getnick(peer),
command
), command, _);
REPLY(462, WRITE(
":%s 462 %s :Unauthorized command (already registered)",
hostname,
getnick(peer)
), _);
REPLY(471, WRITE(
":%s 471 %s %s :Cannot join channel (+l)",
hostname,
getnick(peer),
channel
), channel, _);
default: warn("unknown reply: %d", number); WRITE(
":%s 421 %s err :Reply %d is not implemented yet",
hostname,
getnick(peer),
number
);
}
}
int
reply(const struct Peer *peer, int number, ...)
{
va_list args;
int ret;
va_start(args, number);
ret = vreply(peer, number, args);
va_end(args);
return ret;
}
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