diff options
Diffstat (limited to 'usr.bin/talk/io.c')
-rw-r--r-- | usr.bin/talk/io.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/usr.bin/talk/io.c b/usr.bin/talk/io.c new file mode 100644 index 0000000..5ba6f97 --- /dev/null +++ b/usr.bin/talk/io.c @@ -0,0 +1,142 @@ +/* + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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. + */ + +#ifndef lint +static char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93"; +#endif /* not lint */ + +/* + * This file contains the I/O handling and the exchange of + * edit characters. This connection itself is established in + * ctl.c + */ + +#include <sys/ioctl.h> +#include <sys/time.h> +#include <stdio.h> +#include <errno.h> +#include <string.h> +#include "talk.h" + +#define A_LONG_TIME 10000000 +#define STDIN_MASK (1<<fileno(stdin)) /* the bit mask for standard + input */ + +/* + * The routine to do the actual talking + */ +talk() +{ + register int read_template, sockt_mask; + int read_set, nb; + char buf[BUFSIZ]; + struct timeval wait; + + message("Connection established\007\007\007"); + current_line = 0; + sockt_mask = (1<<sockt); + + /* + * Wait on both the other process (sockt_mask) and + * standard input ( STDIN_MASK ) + */ + read_template = sockt_mask | STDIN_MASK; + for (;;) { + read_set = read_template; + wait.tv_sec = A_LONG_TIME; + wait.tv_usec = 0; + nb = select(32, &read_set, 0, 0, &wait); + if (nb <= 0) { + if (errno == EINTR) { + read_set = read_template; + continue; + } + /* panic, we don't know what happened */ + p_error("Unexpected error from select"); + quit(); + } + if (read_set & sockt_mask) { + /* There is data on sockt */ + nb = read(sockt, buf, sizeof buf); + if (nb <= 0) { + message("Connection closed. Exiting"); + quit(); + } + display(&his_win, buf, nb); + } + if (read_set & STDIN_MASK) { + /* + * We can't make the tty non_blocking, because + * curses's output routines would screw up + */ + ioctl(0, FIONREAD, (struct sgttyb *) &nb); + nb = read(0, buf, nb); + display(&my_win, buf, nb); + /* might lose data here because sockt is non-blocking */ + write(sockt, buf, nb); + } + } +} + +extern int errno; +extern int sys_nerr; + +/* + * p_error prints the system error message on the standard location + * on the screen and then exits. (i.e. a curses version of perror) + */ +p_error(string) + char *string; +{ + wmove(my_win.x_win, current_line%my_win.x_nlines, 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 + */ +message(string) + char *string; +{ + wmove(my_win.x_win, current_line % my_win.x_nlines, 0); + wprintw(my_win.x_win, "[%s]", string); + wclrtoeol(my_win.x_win); + current_line++; + wmove(my_win.x_win, current_line % my_win.x_nlines, 0); + wrefresh(my_win.x_win); +} |