diff options
Diffstat (limited to 'usr.bin/talk/io.c')
| -rw-r--r-- | usr.bin/talk/io.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/usr.bin/talk/io.c b/usr.bin/talk/io.c new file mode 100644 index 000000000000..a2d7fb1818f7 --- /dev/null +++ b/usr.bin/talk/io.c @@ -0,0 +1,173 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * 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. + */ + + + +/* + * 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); +} |