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31c4d32d WJ |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
3 | * 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. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | static char sccsid[] = "@(#)io.c 5.6 (Berkeley) 3/1/91"; | |
36 | #endif /* not lint */ | |
37 | ||
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 <sys/time.h> | |
45 | #include "talk.h" | |
46 | #include <stdio.h> | |
47 | #include <errno.h> | |
48 | #include <string.h> | |
49 | ||
50 | #define A_LONG_TIME 10000000 | |
51 | #define STDIN_MASK (1<<fileno(stdin)) /* the bit mask for standard | |
52 | input */ | |
53 | ||
54 | /* | |
55 | * The routine to do the actual talking | |
56 | */ | |
57 | talk() | |
58 | { | |
59 | register int read_template, sockt_mask; | |
60 | int read_set, nb; | |
61 | char buf[BUFSIZ]; | |
62 | struct timeval wait; | |
63 | ||
64 | message("Connection established\007\007\007"); | |
65 | current_line = 0; | |
66 | sockt_mask = (1<<sockt); | |
67 | ||
68 | /* | |
69 | * Wait on both the other process (sockt_mask) and | |
70 | * standard input ( STDIN_MASK ) | |
71 | */ | |
72 | read_template = sockt_mask | STDIN_MASK; | |
73 | for (;;) { | |
74 | read_set = read_template; | |
75 | wait.tv_sec = A_LONG_TIME; | |
76 | wait.tv_usec = 0; | |
77 | nb = select(32, &read_set, 0, 0, &wait); | |
78 | if (nb <= 0) { | |
79 | if (errno == EINTR) { | |
80 | read_set = read_template; | |
81 | continue; | |
82 | } | |
83 | /* panic, we don't know what happened */ | |
84 | p_error("Unexpected error from select"); | |
85 | quit(); | |
86 | } | |
87 | if (read_set & sockt_mask) { | |
88 | /* There is data on sockt */ | |
89 | nb = read(sockt, buf, sizeof buf); | |
90 | if (nb <= 0) { | |
91 | message("Connection closed. Exiting"); | |
92 | quit(); | |
93 | } | |
94 | display(&his_win, buf, nb); | |
95 | } | |
96 | if (read_set & STDIN_MASK) { | |
97 | /* | |
98 | * We can't make the tty non_blocking, because | |
99 | * curses's output routines would screw up | |
100 | */ | |
101 | ioctl(0, FIONREAD, (struct sgttyb *) &nb); | |
102 | nb = read(0, buf, nb); | |
103 | display(&my_win, buf, nb); | |
104 | /* might lose data here because sockt is non-blocking */ | |
105 | write(sockt, buf, nb); | |
106 | } | |
107 | } | |
108 | } | |
109 | ||
110 | extern int errno; | |
111 | extern int sys_nerr; | |
112 | ||
113 | /* | |
114 | * p_error prints the system error message on the standard location | |
115 | * on the screen and then exits. (i.e. a curses version of perror) | |
116 | */ | |
117 | p_error(string) | |
118 | char *string; | |
119 | { | |
120 | wmove(my_win.x_win, current_line%my_win.x_nlines, 0); | |
121 | wprintw(my_win.x_win, "[%s : %s (%d)]\n", | |
122 | string, strerror(errno), errno); | |
123 | wrefresh(my_win.x_win); | |
124 | move(LINES-1, 0); | |
125 | refresh(); | |
126 | quit(); | |
127 | } | |
128 | ||
129 | /* | |
130 | * Display string in the standard location | |
131 | */ | |
132 | message(string) | |
133 | char *string; | |
134 | { | |
135 | ||
136 | wmove(my_win.x_win, current_line%my_win.x_nlines, 0); | |
137 | wprintw(my_win.x_win, "[%s]\n", string); | |
138 | wrefresh(my_win.x_win); | |
139 | } |