ditto.c   [plain text]

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/*
 * Author: Thomas E. Dickey <dickey@clark.net> 1998
 *
 * $Id: ditto.c,v 1.4 2001/09/15 21:53:37 tom Exp $
 *
 * The program illustrates how to set up multiple screens from a single
 * program.  Invoke the program by specifying another terminal on the same
 * machine by specifying its device, e.g.,
 *	ditto /dev/ttyp1
 */
#include <test.priv.h>
#include <sys/stat.h>
#include <errno.h>

typedef struct {
    FILE *input;
    FILE *output;
    SCREEN *screen;
} DITTO;

static void
failed(const char *s)
{
    perror(s);
    ExitProgram(EXIT_FAILURE);
}

static void
usage(void)
{
    fprintf(stderr, "usage: ditto [terminal1 ...]\n");
    ExitProgram(EXIT_FAILURE);
}

static FILE *
open_tty(char *path)
{
    FILE *fp;
    struct stat sb;

    if (stat(path, &sb) < 0)
	failed(path);
    if ((sb.st_mode & S_IFMT) != S_IFCHR) {
	errno = ENOTTY;
	failed(path);
    }
    fp = fopen(path, "a+");
    if (fp == 0)
	failed(path);
    printf("opened %s\n", path);
    return fp;
}

int
main(
	int argc GCC_UNUSED,
	char *argv[]GCC_UNUSED)
{
    int j;
    int active_tty = 0;
    DITTO *data;

    if (argc <= 1)
	usage();

    if ((data = (DITTO *) calloc(argc, sizeof(DITTO))) == 0)
	failed("calloc data");

    data[0].input = stdin;
    data[0].output = stdout;
    for (j = 1; j < argc; j++) {
	data[j].input =
	    data[j].output = open_tty(argv[j]);
    }

    /*
     * If we got this far, we have open connection(s) to the terminal(s).
     * Set up the screens.
     */
    for (j = 0; j < argc; j++) {
	active_tty++;
	data[j].screen = newterm(
				    (char *) 0,		/* assume $TERM is the same */
				    data[j].output,
				    data[j].input);
	if (data[j].screen == 0)
	    failed("newterm");
	cbreak();
	noecho();
	scrollok(stdscr, TRUE);
    }

    /*
     * Loop, reading characters from any of the inputs and writing to all
     * of the screens.
     */
    for (;;) {
	int ch;
	set_term(data[0].screen);
	ch = getch();
	if (ch == ERR)
	    continue;
	if (ch == 4)
	    break;
	for (j = 0; j < argc; j++) {
	    set_term(data[j].screen);
	    addch(ch);
	    refresh();
	}
    }

    /*
     * Cleanup and exit
     */
    for (j = argc - 1; j >= 0; j--) {
	set_term(data[j].screen);
	endwin();
    }
    ExitProgram(EXIT_SUCCESS);
}