Remove some unnecessary casts.
[dragonfly.git] / usr.bin / talk / io.c
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1/*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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32 *
33 * @(#)io.c 8.1 (Berkeley) 6/6/93
34 * $FreeBSD: src/usr.bin/talk/io.c,v 1.9.2.2 2001/10/15 13:42:07 dd Exp $
1d1731fa 35 * $DragonFly: src/usr.bin/talk/io.c,v 1.3 2003/10/04 20:36:52 hmp Exp $
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36 */
37
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38/*
39 * This file contains the I/O handling and the exchange of
40 * edit characters. This connection itself is established in
41 * ctl.c
42 */
43
44#include <errno.h>
45#include <netdb.h>
46#include <stdlib.h>
47#include <string.h>
48#include <sys/filio.h>
49#include "talk.h"
50#include "talk_ctl.h"
51
52#define A_LONG_TIME 10000000
53
54/*
55 * The routine to do the actual talking
56 */
57void
1d1731fa 58talk(void)
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59{
60 struct hostent *hp, *hp2;
61 int nb;
62 fd_set read_set, read_template;
63 char buf[BUFSIZ], **addr, *his_machine_name;
64 struct timeval wait;
65
66 his_machine_name = NULL;
15b85273 67 hp = gethostbyaddr(&his_machine_addr.s_addr,
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68 sizeof(his_machine_addr.s_addr), AF_INET);
69 if (hp != NULL) {
70 hp2 = gethostbyname(hp->h_name);
71 if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
72 hp2->h_length == sizeof(his_machine_addr))
73 for (addr = hp2->h_addr_list; *addr != NULL; addr++)
74 if (memcmp(*addr, &his_machine_addr,
75 sizeof(his_machine_addr)) == 0) {
76 his_machine_name = strdup(hp->h_name);
77 break;
78 }
79 }
80 if (his_machine_name == NULL)
81 his_machine_name = strdup(inet_ntoa(his_machine_addr));
82 snprintf(buf, sizeof(buf), "Connection established with %s@%s.",
83 msg.r_name, his_machine_name);
84 free(his_machine_name);
85 message(buf);
86 write(STDOUT_FILENO, "\007\007\007", 3);
87
88 current_line = 0;
89
90 /*
91 * Wait on both the other process (sockt_mask) and
92 * standard input ( STDIN_MASK )
93 */
94 FD_ZERO(&read_template);
95 FD_SET(sockt, &read_template);
96 FD_SET(fileno(stdin), &read_template);
97 for (;;) {
98 read_set = read_template;
99 wait.tv_sec = A_LONG_TIME;
100 wait.tv_usec = 0;
101 nb = select(32, &read_set, 0, 0, &wait);
102 if (nb <= 0) {
103 if (errno == EINTR) {
104 read_set = read_template;
105 continue;
106 }
107 /* panic, we don't know what happened */
108 p_error("Unexpected error from select");
109 quit();
110 }
111 if (FD_ISSET(sockt, &read_set)) {
112 /* There is data on sockt */
113 nb = read(sockt, buf, sizeof buf);
114 if (nb <= 0) {
115 message("Connection closed. Exiting");
116 quit();
117 }
118 display(&his_win, buf, nb);
119 }
120 if (FD_ISSET(fileno(stdin), &read_set)) {
121 /*
122 * We can't make the tty non_blocking, because
123 * curses's output routines would screw up
124 */
125 int i;
126 ioctl(0, FIONREAD, (struct sgttyb *) &nb);
127 nb = read(0, buf, nb);
128 display(&my_win, buf, nb);
129 /* might lose data here because sockt is non-blocking */
130 for (i = 0; i < nb; ++i)
131 if (buf[i] == '\r')
132 buf[i] = '\n';
133 write(sockt, buf, nb);
134 }
135 }
136}
137
138/*
139 * p_error prints the system error message on the standard location
140 * on the screen and then exits. (i.e. a curses version of perror)
141 */
142void
1d1731fa 143p_error(char *string)
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144{
145 wmove(my_win.x_win, current_line, 0);
146 wprintw(my_win.x_win, "[%s : %s (%d)]\n",
147 string, strerror(errno), errno);
148 wrefresh(my_win.x_win);
149 move(LINES-1, 0);
150 refresh();
151 quit();
152}
153
154/*
155 * Display string in the standard location
156 */
157void
1d1731fa 158message(char *string)
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159{
160 wmove(my_win.x_win, current_line, 0);
161 wprintw(my_win.x_win, "[%s]\n", string);
162 if (current_line < my_win.x_nlines - 1)
163 current_line++;
164 wrefresh(my_win.x_win);
165}