142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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/*
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* This file contains the I/O handling and the exchange of
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* edit characters. This connection itself is established in
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* ctl.c
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*/
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include "talk.h"
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#define A_LONG_TIME 10000000
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#define STDIN_MASK (1<<fileno(stdin)) /* the bit mask for standard
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input */
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/*
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* The routine to do the actual talking
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*/
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talk()
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{
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register int read_template, sockt_mask;
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int read_set, nb;
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char buf[BUFSIZ];
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struct timeval wait;
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message("Connection established\007\007\007");
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current_line = 0;
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sockt_mask = (1<<sockt);
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/*
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* Wait on both the other process (sockt_mask) and
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* standard input ( STDIN_MASK )
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*/
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read_template = sockt_mask | STDIN_MASK;
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for (;;) {
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read_set = read_template;
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wait.tv_sec = A_LONG_TIME;
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wait.tv_usec = 0;
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nb = select(32, &read_set, 0, 0, &wait);
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if (nb <= 0) {
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if (errno == EINTR) {
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read_set = read_template;
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continue;
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}
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/* panic, we don't know what happened */
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p_error("Unexpected error from select");
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quit();
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}
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if (read_set & sockt_mask) {
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/* There is data on sockt */
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nb = read(sockt, buf, sizeof buf);
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if (nb <= 0) {
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message("Connection closed. Exiting");
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quit();
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}
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display(&his_win, buf, nb);
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}
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if (read_set & STDIN_MASK) {
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/*
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* We can't make the tty non_blocking, because
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* curses's output routines would screw up
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*/
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ioctl(0, FIONREAD, (struct sgttyb *) &nb);
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nb = read(0, buf, nb);
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display(&my_win, buf, nb);
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/* might lose data here because sockt is non-blocking */
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write(sockt, buf, nb);
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}
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}
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}
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extern int errno;
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extern int sys_nerr;
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/*
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* p_error prints the system error message on the standard location
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* on the screen and then exits. (i.e. a curses version of perror)
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*/
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p_error(string)
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char *string;
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{
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wmove(my_win.x_win, current_line, 0);
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wprintw(my_win.x_win, "[%s : %s (%d)]\n",
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string, strerror(errno), errno);
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wrefresh(my_win.x_win);
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move(LINES-1, 0);
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refresh();
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quit();
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}
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/*
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* Display string in the standard location
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*/
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message(string)
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char *string;
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{
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wmove(my_win.x_win, current_line, 0);
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wprintw(my_win.x_win, "[%s]\n", string);
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if (current_line < my_win.x_nlines - 1)
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current_line++;
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wrefresh(my_win.x_win);
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}
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