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freebsd/usr.bin/talk/io.c
Warner Losh fbbd9655e5 Renumber copyright clause 4
Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by:	Jan Schaumann <jschauma@stevens.edu>
Pull Request:	https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00

178 lines
4.7 KiB
C

/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#ifndef lint
static const char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93";
#endif
/*
* This file contains the I/O handling and the exchange of
* edit characters. This connection itself is established in
* ctl.c
*/
#include <sys/filio.h>
#include <errno.h>
#include <signal.h>
#include <netdb.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define _XOPEN_SOURCE_EXTENDED
#include <curses.h>
#include "talk.h"
#include "talk_ctl.h"
extern void display(xwin_t *, wchar_t *);
volatile sig_atomic_t gotwinch = 0;
/*
* The routine to do the actual talking
*/
void
talk(void)
{
struct hostent *hp, *hp2;
struct pollfd fds[2];
int nb;
wchar_t buf[BUFSIZ];
char **addr, *his_machine_name;
FILE *sockfp;
his_machine_name = NULL;
hp = gethostbyaddr((const char *)&his_machine_addr.s_addr,
sizeof(his_machine_addr.s_addr), AF_INET);
if (hp != NULL) {
hp2 = gethostbyname(hp->h_name);
if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
hp2->h_length == sizeof(his_machine_addr))
for (addr = hp2->h_addr_list; *addr != NULL; addr++)
if (memcmp(*addr, &his_machine_addr,
sizeof(his_machine_addr)) == 0) {
his_machine_name = strdup(hp->h_name);
break;
}
}
if (his_machine_name == NULL)
his_machine_name = strdup(inet_ntoa(his_machine_addr));
snprintf((char *)buf, sizeof(buf), "Connection established with %s@%s.",
msg.r_name, his_machine_name);
free(his_machine_name);
message((char *)buf);
write(STDOUT_FILENO, "\007\007\007", 3);
current_line = 0;
if ((sockfp = fdopen(sockt, "w+")) == NULL)
p_error("fdopen");
setvbuf(sockfp, NULL, _IONBF, 0);
setvbuf(stdin, NULL, _IONBF, 0);
/*
* Wait on both the other process (sockt) and standard input.
*/
for (;;) {
fds[0].fd = fileno(stdin);
fds[0].events = POLLIN;
fds[1].fd = sockt;
fds[1].events = POLLIN;
nb = poll(fds, 2, INFTIM);
if (gotwinch) {
resize_display();
gotwinch = 0;
}
if (nb <= 0) {
if (errno == EINTR)
continue;
/* Panic, we don't know what happened. */
p_error("Unexpected error from poll");
quit();
}
if (fds[1].revents & POLLIN) {
wint_t w;
/* There is data on sockt. */
w = fgetwc(sockfp);
if (w == WEOF) {
message("Connection closed. Exiting");
quit();
}
display(&his_win, &w);
}
if (fds[0].revents & POLLIN) {
wint_t w;
if ((w = getwchar()) != WEOF) {
display(&my_win, &w);
(void )fputwc(w, sockfp);
(void )fflush(sockfp);
}
}
}
}
/*
* p_error prints the system error message on the standard location
* on the screen and then exits. (i.e. a curses version of perror)
*/
void
p_error(const char *string)
{
wmove(my_win.x_win, current_line, 0);
wprintw(my_win.x_win, "[%s : %s (%d)]\n",
string, strerror(errno), errno);
wrefresh(my_win.x_win);
move(LINES-1, 0);
refresh();
quit();
}
/*
* Display string in the standard location
*/
void
message(const char *string)
{
wmove(my_win.x_win, current_line, 0);
wprintw(my_win.x_win, "[%s]\n", string);
if (current_line < my_win.x_nlines - 1)
current_line++;
wrefresh(my_win.x_win);
}