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28
29/*
30 * Author: Thomas E. Dickey <dickey@clark.net> 1998
31 *
32 * $Id: ditto.c,v 1.5 2005/04/16 16:35:49 tom Exp $
33 *
34 * The program illustrates how to set up multiple screens from a single
35 * program.  Invoke the program by specifying another terminal on the same
36 * machine by specifying its device, e.g.,
37 *	ditto /dev/ttyp1
38 */
39#include <test.priv.h>
40#include <sys/stat.h>
41#include <errno.h>
42
43typedef struct {
44    FILE *input;
45    FILE *output;
46    SCREEN *screen;
47} DITTO;
48
49static void
50failed(const char *s)
51{
52    perror(s);
53    ExitProgram(EXIT_FAILURE);
54}
55
56static void
57usage(void)
58{
59    fprintf(stderr, "usage: ditto [terminal1 ...]\n");
60    ExitProgram(EXIT_FAILURE);
61}
62
63static FILE *
64open_tty(char *path)
65{
66    FILE *fp;
67    struct stat sb;
68
69    if (stat(path, &sb) < 0)
70	failed(path);
71    if ((sb.st_mode & S_IFMT) != S_IFCHR) {
72	errno = ENOTTY;
73	failed(path);
74    }
75    fp = fopen(path, "a+");
76    if (fp == 0)
77	failed(path);
78    printf("opened %s\n", path);
79    return fp;
80}
81
82int
83main(int argc GCC_UNUSED,
84     char *argv[]GCC_UNUSED)
85{
86    int j;
87    int active_tty = 0;
88    DITTO *data;
89
90    if (argc <= 1)
91	usage();
92
93    if ((data = (DITTO *) calloc((unsigned) argc, sizeof(DITTO))) == 0)
94	failed("calloc data");
95
96    data[0].input = stdin;
97    data[0].output = stdout;
98    for (j = 1; j < argc; j++) {
99	data[j].input =
100	    data[j].output = open_tty(argv[j]);
101    }
102
103    /*
104     * If we got this far, we have open connection(s) to the terminal(s).
105     * Set up the screens.
106     */
107    for (j = 0; j < argc; j++) {
108	active_tty++;
109	data[j].screen = newterm((char *) 0,	/* assume $TERM is the same */
110				 data[j].output,
111				 data[j].input);
112	if (data[j].screen == 0)
113	    failed("newterm");
114	cbreak();
115	noecho();
116	scrollok(stdscr, TRUE);
117    }
118
119    /*
120     * Loop, reading characters from any of the inputs and writing to all
121     * of the screens.
122     */
123    for (;;) {
124	int ch;
125	set_term(data[0].screen);
126	ch = getch();
127	if (ch == ERR)
128	    continue;
129	if (ch == 4)
130	    break;
131	for (j = 0; j < argc; j++) {
132	    set_term(data[j].screen);
133	    addch(UChar(ch));
134	    refresh();
135	}
136    }
137
138    /*
139     * Cleanup and exit
140     */
141    for (j = argc - 1; j >= 0; j--) {
142	set_term(data[j].screen);
143	endwin();
144    }
145    ExitProgram(EXIT_SUCCESS);
146}
147