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+/****************************************************************************
+ * Copyright (c) 1998-2009,2010 Free Software Foundation, Inc. *
+ * *
+ * Permission is hereby granted, free of charge, to any person obtaining a *
+ * copy of this software and associated documentation files (the *
+ * "Software"), to deal in the Software without restriction, including *
+ * without limitation the rights to use, copy, modify, merge, publish, *
+ * distribute, distribute with modifications, sublicense, and/or sell *
+ * copies of the Software, and to permit persons to whom the Software is *
+ * furnished to do so, subject to the following conditions: *
+ * *
+ * The above copyright notice and this permission notice shall be included *
+ * in all copies or substantial portions of the Software. *
+ * *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
+ * *
+ * Except as contained in this notice, the name(s) of the above copyright *
+ * holders shall not be used in advertising or otherwise to promote the *
+ * sale, use or other dealings in this Software without prior written *
+ * authorization. *
+ ****************************************************************************/
+
+/*
+ * Author: Thomas E. Dickey (1998-on)
+ *
+ * $Id: ditto.c,v 1.40 2010/11/14 01:06:47 tom Exp $
+ *
+ * The program illustrates how to set up multiple screens from a single
+ * program.
+ *
+ * If openpty() is supported, the command line parameters are titles for
+ * the windows showing each screen's data.
+ *
+ * If openpty() is not supported, you must 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>
+
+#ifdef USE_PTHREADS
+#include <pthread.h>
+#endif
+
+#ifdef USE_XTERM_PTY
+#include USE_OPENPTY_HEADER
+#endif
+
+#define MAX_FIFO 256
+
+#define THIS_FIFO(n) ((n) % MAX_FIFO)
+#define NEXT_FIFO(n) THIS_FIFO((n) + 1)
+
+typedef struct {
+ unsigned long sequence;
+ int head;
+ int tail;
+ int data[MAX_FIFO];
+} FIFO;
+
+typedef struct {
+ unsigned long sequence;
+} PEEK;
+
+/*
+ * Data "owned" for a single screen. Each screen is divided into windows that
+ * show the text read from each terminal. Input from a given screen will also
+ * be read into one window per screen.
+ */
+typedef struct {
+ FILE *input;
+ FILE *output;
+ SCREEN *screen; /* this screen - curses internal data */
+ int which1; /* this screen's index in DITTO[] array */
+ int length; /* length of windows[] and peeks[] */
+ char **titles; /* per-window titles */
+ WINDOW **windows; /* display data from each screen */
+ PEEK *peeks; /* indices for each screen's fifo */
+ FIFO fifo; /* fifo for this screen */
+#ifdef USE_PTHREADS
+ pthread_t thread;
+#endif
+} DITTO;
+
+/*
+ * Structure used to pass multiple parameters via the use_screen()
+ * single-parameter interface.
+ */
+typedef struct {
+ int source; /* which screen did character come from */
+ int target; /* which screen is character going to */
+ DITTO *ditto; /* data for all screens */
+} DDATA;
+
+static void
+failed(const char *s)
+{
+ perror(s);
+ ExitProgram(EXIT_FAILURE);
+}
+
+static void
+usage(void)
+{
+ fprintf(stderr, "usage: ditto [terminal1 ...]\n");
+ ExitProgram(EXIT_FAILURE);
+}
+
+/* Add to the head of the fifo, checking for overflow. */
+static void
+put_fifo(FIFO * fifo, int value)
+{
+ int next = NEXT_FIFO(fifo->head);
+ if (next == fifo->tail)
+ fifo->tail = NEXT_FIFO(fifo->tail);
+ fifo->data[next] = value;
+ fifo->head = next;
+ fifo->sequence += 1;
+}
+
+/* Get data from the tail (oldest part) of the fifo, returning -1 if no data.
+ * Since each screen can peek into the fifo, we do not update the tail index,
+ * but modify the peek-index.
+ *
+ * FIXME - test/workaround for case where fifo gets more than a buffer
+ * ahead of peek.
+ */
+static int
+peek_fifo(FIFO * fifo, PEEK * peek)
+{
+ int result = -1;
+ if (peek->sequence < fifo->sequence) {
+ result = fifo->data[THIS_FIFO(peek->sequence)];
+ peek->sequence += 1;
+ }
+ return result;
+}
+
+static FILE *
+open_tty(char *path)
+{
+ FILE *fp;
+#ifdef USE_XTERM_PTY
+ int amaster;
+ int aslave;
+ char slave_name[1024];
+ char s_option[sizeof(slave_name) + 80];
+
+ if (openpty(&amaster, &aslave, slave_name, 0, 0) != 0
+ || strlen(slave_name) > sizeof(slave_name) - 1)
+ failed("openpty");
+ if (strrchr(slave_name, '/') == 0) {
+ errno = EISDIR;
+ failed(slave_name);
+ }
+ sprintf(s_option, "-S%s/%d", slave_name, aslave);
+ if (fork()) {
+ execlp("xterm", "xterm", s_option, "-title", path, (char *) 0);
+ _exit(0);
+ }
+ fp = fdopen(amaster, "r+");
+ if (fp == 0)
+ failed(path);
+#else
+ 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, "r+");
+ if (fp == 0)
+ failed(path);
+ printf("opened %s\n", path);
+#endif
+ assert(fp != 0);
+ return fp;
+}
+
+static void
+init_screen(
+#if HAVE_USE_WINDOW
+ SCREEN *sp GCC_UNUSED,
+#endif
+ void *arg)
+{
+ DITTO *target = (DITTO *) arg;
+ int high, wide;
+ int k;
+
+ cbreak();
+ noecho();
+ scrollok(stdscr, TRUE);
+ box(stdscr, 0, 0);
+
+ target->windows = typeCalloc(WINDOW *, (size_t) target->length);
+ target->peeks = typeCalloc(PEEK, (size_t) target->length);
+
+ high = (LINES - 2) / target->length;
+ wide = (COLS - 2);
+ for (k = 0; k < target->length; ++k) {
+ WINDOW *outer = newwin(high, wide, 1 + (high * k), 1);
+ WINDOW *inner = derwin(outer, high - 2, wide - 2, 1, 1);
+
+ box(outer, 0, 0);
+ MvWAddStr(outer, 0, 2, target->titles[k]);
+ wnoutrefresh(outer);
+
+ scrollok(inner, TRUE);
+ keypad(inner, TRUE);
+#ifndef USE_PTHREADS
+ nodelay(inner, TRUE);
+#endif
+
+ target->windows[k] = inner;
+ }
+ doupdate();
+}
+
+static void
+open_screen(DITTO * target, char **source, int length, int which1)
+{
+ if (which1 != 0) {
+ target->input =
+ target->output = open_tty(source[which1]);
+ } else {
+ target->input = stdin;
+ target->output = stdout;
+ }
+
+ target->which1 = which1;
+ target->titles = source;
+ target->length = length;
+ target->fifo.head = -1;
+ target->screen = newterm((char *) 0, /* assume $TERM is the same */
+ target->output,
+ target->input);
+
+ if (target->screen == 0)
+ failed("newterm");
+
+ (void) USING_SCREEN(target->screen, init_screen, target);
+}
+
+static int
+close_screen(
+#if HAVE_USE_WINDOW
+ SCREEN *sp GCC_UNUSED,
+#endif
+ void *arg GCC_UNUSED)
+{
+#if HAVE_USE_WINDOW
+ (void) sp;
+#endif
+ (void) arg;
+ return endwin();
+}
+
+/*
+ * Read data from the 'source' screen.
+ */
+static int
+read_screen(
+#if HAVE_USE_WINDOW
+ SCREEN *sp GCC_UNUSED,
+#endif
+ void *arg)
+{
+ DDATA *data = (DDATA *) arg;
+ DITTO *ditto = &(data->ditto[data->source]);
+ WINDOW *win = ditto->windows[data->source];
+ int ch = wgetch(win);
+
+ if (ch > 0 && ch < 256)
+ put_fifo(&(ditto->fifo), ch);
+ else
+ ch = ERR;
+
+ return ch;
+}
+
+/*
+ * Write all of the data that's in fifos for the 'target' screen.
+ */
+static int
+write_screen(
+#if HAVE_USE_WINDOW
+ SCREEN *sp GCC_UNUSED,
+#endif
+ void *arg GCC_UNUSED)
+{
+ DDATA *data = (DDATA *) arg;
+ DITTO *ditto = &(data->ditto[data->target]);
+ bool changed = FALSE;
+ int which;
+
+ for (which = 0; which < ditto->length; ++which) {
+ WINDOW *win = ditto->windows[which];
+ FIFO *fifo = &(data->ditto[which].fifo);
+ PEEK *peek = &(ditto->peeks[which]);
+ int ch;
+
+ while ((ch = peek_fifo(fifo, peek)) > 0) {
+ changed = TRUE;
+
+ waddch(win, (chtype) ch);
+ wnoutrefresh(win);
+ }
+ }
+
+ if (changed)
+ doupdate();
+ return OK;
+}
+
+static void
+show_ditto(DITTO * data, int count, DDATA * ddata)
+{
+ int n;
+
+ (void) data;
+ for (n = 0; n < count; n++) {
+ ddata->target = n;
+ USING_SCREEN(data[n].screen, write_screen, (void *) ddata);
+ }
+}
+
+#ifdef USE_PTHREADS
+static void *
+handle_screen(void *arg)
+{
+ DDATA ddata;
+ int ch;
+
+ memset(&ddata, 0, sizeof(ddata));
+ ddata.ditto = (DITTO *) arg;
+ ddata.source = ddata.ditto->which1;
+ ddata.ditto -= ddata.source; /* -> base of array */
+
+ for (;;) {
+ ch = read_screen(ddata.ditto->screen, &ddata);
+ if (ch == CTRL('D')) {
+ int later = (ddata.source ? ddata.source : -1);
+ int j;
+
+ for (j = ddata.ditto->length - 1; j > 0; --j) {
+ if (j != later) {
+ pthread_cancel(ddata.ditto[j].thread);
+ }
+ }
+ if (later > 0) {
+ pthread_cancel(ddata.ditto[later].thread);
+ }
+ break;
+ }
+ show_ditto(ddata.ditto, ddata.ditto->length, &ddata);
+ }
+ return NULL;
+}
+#endif
+
+int
+main(int argc, char *argv[])
+{
+ int j;
+ DITTO *data;
+#ifndef USE_PTHREADS
+ int count;
+#endif
+
+ if (argc <= 1)
+ usage();
+
+ if ((data = typeCalloc(DITTO, (size_t) argc)) == 0)
+ failed("calloc data");
+
+ assert(data != 0);
+
+ for (j = 0; j < argc; j++) {
+ open_screen(&data[j], argv, argc, j);
+ }
+
+#ifdef USE_PTHREADS
+ /*
+ * For multi-threaded operation, set up a reader for each of the screens.
+ * That uses blocking I/O rather than polling for input, so no calls to
+ * napms() are needed.
+ */
+ for (j = 0; j < argc; j++) {
+ (void) pthread_create(&(data[j].thread), NULL, handle_screen, &data[j]);
+ }
+ pthread_join(data[1].thread, NULL);
+#else
+ /*
+ * Loop, reading characters from any of the inputs and writing to all
+ * of the screens.
+ */
+ for (count = 0;; ++count) {
+ DDATA ddata;
+ int ch;
+ int which = (count % argc);
+
+ napms(20);
+
+ ddata.source = which;
+ ddata.ditto = data;
+
+ ch = USING_SCREEN(data[which].screen, read_screen, &ddata);
+ if (ch == CTRL('D')) {
+ break;
+ } else if (ch != ERR) {
+ show_ditto(data, argc, &ddata);
+ }
+ }
+#endif
+
+ /*
+ * Cleanup and exit
+ */
+ for (j = argc - 1; j >= 0; j--) {
+ USING_SCREEN(data[j].screen, close_screen, 0);
+ fprintf(data[j].output, "**Closed\r\n");
+
+ /*
+ * Closing before a delscreen() helps ncurses determine that there
+ * is no valid output buffer, and can remove the setbuf() data.
+ */
+ fflush(data[j].output);
+ fclose(data[j].output);
+ delscreen(data[j].screen);
+ }
+ ExitProgram(EXIT_SUCCESS);
+}
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