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Make all messages sent between the client and server fixed size.

This is the first of two changes to make the protocol more resilient and less
sensitive to other changes in the code, particularly with commands. The client
now packs argv into a buffer and sends it to the server for parsing, rather
than doing it itself and sending the parsed command data.

As a side-effect this also removes a lot of now-unused command marshalling
code.

Mixing a server without this change and a client with or vice versa will cause
tmux to hang or crash, please ensure that tmux is entirely killed before
upgrading.

/* $OpenBSD: cmd-choose-session.c,v 1.4 2009/07/26 12:58:44 nicm Exp $ */

/*
 * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * 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 MIND, 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 <sys/types.h>

#include "tmux.h"

/*
 * Enter choice mode to choose a session.
 */

int	cmd_choose_session_exec(struct cmd *, struct cmd_ctx *);

void	cmd_choose_session_callback(void *, int);

const struct cmd_entry cmd_choose_session_entry = {
	"choose-session", NULL,
	CMD_TARGET_WINDOW_USAGE,
	0, 0,
	cmd_target_init,
	cmd_target_parse,
	cmd_choose_session_exec,
	cmd_target_free,
	cmd_target_print
};

struct cmd_choose_session_data {
	u_int	client;
};

int
cmd_choose_session_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct cmd_target_data		*data = self->data;
	struct cmd_choose_session_data	*cdata;
	struct winlink			*wl;
	struct session			*s;
	u_int			 	 i, idx, cur;

	if (ctx->curclient == NULL) {
		ctx->error(ctx, "must be run interactively");
		return (-1);
	}

	if ((wl = cmd_find_window(ctx, data->target, NULL)) == NULL)
		return (-1);

	if (window_pane_set_mode(wl->window->active, &window_choose_mode) != 0)
		return (0);

	cur = idx = 0;
	for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
		s = ARRAY_ITEM(&sessions, i);
		if (s == NULL)
			continue;
		if (s == ctx->curclient->session)
			cur = idx;
		idx++;

		window_choose_add(wl->window->active, i,
		    "%s: %u windows [%ux%u]%s", s->name,
		    winlink_count(&s->windows), s->sx, s->sy,
		    s->flags & SESSION_UNATTACHED ? "" : " (attached)");
	}

	cdata = xmalloc(sizeof *cdata);
	cdata->client = server_client_index(ctx->curclient);

	window_choose_ready(
	    wl->window->active, cur, cmd_choose_session_callback, xfree, cdata);

	return (0);
}

void
cmd_choose_session_callback(void *data, int idx)
{
	struct cmd_choose_session_data	*cdata = data;
	struct client  			*c;

	if (idx != -1 && cdata->client <= ARRAY_LENGTH(&clients) - 1) {
		c = ARRAY_ITEM(&clients, cdata->client);
		if (c != NULL && (u_int) idx <= ARRAY_LENGTH(&sessions) - 1) {
			c->session = ARRAY_ITEM(&sessions, idx);
			recalculate_sizes();
			server_redraw_client(c);
		}
	}
}