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30 * Author: Thomas E. Dickey (1998-on)
32 * $Id: ditto.c,v 1.41 2011/05/21 18:55:07 tom Exp $
34 * The program illustrates how to set up multiple screens from a single
37 * If openpty() is supported, the command line parameters are titles for
38 * the windows showing each screen's data.
40 * If openpty() is not supported, you must invoke the program by specifying
41 * another terminal on the same machine by specifying its device, e.g.,
44 #include <test.priv.h>
52 #include USE_OPENPTY_HEADER
57 #define THIS_FIFO(n) ((n) % MAX_FIFO)
58 #define NEXT_FIFO(n) THIS_FIFO((n) + 1)
61 unsigned long sequence;
68 unsigned long sequence;
72 * Data "owned" for a single screen. Each screen is divided into windows that
73 * show the text read from each terminal. Input from a given screen will also
74 * be read into one window per screen.
79 SCREEN *screen; /* this screen - curses internal data */
80 int which1; /* this screen's index in DITTO[] array */
81 int length; /* length of windows[] and peeks[] */
82 char **titles; /* per-window titles */
83 WINDOW **windows; /* display data from each screen */
84 PEEK *peeks; /* indices for each screen's fifo */
85 FIFO fifo; /* fifo for this screen */
92 * Structure used to pass multiple parameters via the use_screen()
93 * single-parameter interface.
96 int source; /* which screen did character come from */
97 int target; /* which screen is character going to */
98 DITTO *ditto; /* data for all screens */
101 static void failed(const char *) GCC_NORETURN;
102 static void usage(void) GCC_NORETURN;
105 failed(const char *s)
108 ExitProgram(EXIT_FAILURE);
114 fprintf(stderr, "usage: ditto [terminal1 ...]\n");
115 ExitProgram(EXIT_FAILURE);
118 /* Add to the head of the fifo, checking for overflow. */
120 put_fifo(FIFO * fifo, int value)
122 int next = NEXT_FIFO(fifo->head);
123 if (next == fifo->tail)
124 fifo->tail = NEXT_FIFO(fifo->tail);
125 fifo->data[next] = value;
130 /* Get data from the tail (oldest part) of the fifo, returning -1 if no data.
131 * Since each screen can peek into the fifo, we do not update the tail index,
132 * but modify the peek-index.
134 * FIXME - test/workaround for case where fifo gets more than a buffer
138 peek_fifo(FIFO * fifo, PEEK * peek)
141 if (peek->sequence < fifo->sequence) {
142 result = fifo->data[THIS_FIFO(peek->sequence)];
155 char slave_name[1024];
156 char s_option[sizeof(slave_name) + 80];
158 if (openpty(&amaster, &aslave, slave_name, 0, 0) != 0
159 || strlen(slave_name) > sizeof(slave_name) - 1)
161 if (strrchr(slave_name, '/') == 0) {
165 sprintf(s_option, "-S%s/%d", slave_name, aslave);
167 execlp("xterm", "xterm", s_option, "-title", path, (char *) 0);
170 fp = fdopen(amaster, "r+");
176 if (stat(path, &sb) < 0)
178 if ((sb.st_mode & S_IFMT) != S_IFCHR) {
182 fp = fopen(path, "r+");
185 printf("opened %s\n", path);
194 SCREEN *sp GCC_UNUSED,
198 DITTO *target = (DITTO *) arg;
204 scrollok(stdscr, TRUE);
207 target->windows = typeCalloc(WINDOW *, (size_t) target->length);
208 target->peeks = typeCalloc(PEEK, (size_t) target->length);
210 high = (LINES - 2) / target->length;
212 for (k = 0; k < target->length; ++k) {
213 WINDOW *outer = newwin(high, wide, 1 + (high * k), 1);
214 WINDOW *inner = derwin(outer, high - 2, wide - 2, 1, 1);
217 MvWAddStr(outer, 0, 2, target->titles[k]);
220 scrollok(inner, TRUE);
223 nodelay(inner, TRUE);
226 target->windows[k] = inner;
232 open_screen(DITTO * target, char **source, int length, int which1)
236 target->output = open_tty(source[which1]);
238 target->input = stdin;
239 target->output = stdout;
242 target->which1 = which1;
243 target->titles = source;
244 target->length = length;
245 target->fifo.head = -1;
246 target->screen = newterm((char *) 0, /* assume $TERM is the same */
250 if (target->screen == 0)
253 (void) USING_SCREEN(target->screen, init_screen, target);
259 SCREEN *sp GCC_UNUSED,
261 void *arg GCC_UNUSED)
271 * Read data from the 'source' screen.
276 SCREEN *sp GCC_UNUSED,
280 DDATA *data = (DDATA *) arg;
281 DITTO *ditto = &(data->ditto[data->source]);
282 WINDOW *win = ditto->windows[data->source];
283 int ch = wgetch(win);
285 if (ch > 0 && ch < 256)
286 put_fifo(&(ditto->fifo), ch);
294 * Write all of the data that's in fifos for the 'target' screen.
299 SCREEN *sp GCC_UNUSED,
301 void *arg GCC_UNUSED)
303 DDATA *data = (DDATA *) arg;
304 DITTO *ditto = &(data->ditto[data->target]);
305 bool changed = FALSE;
308 for (which = 0; which < ditto->length; ++which) {
309 WINDOW *win = ditto->windows[which];
310 FIFO *fifo = &(data->ditto[which].fifo);
311 PEEK *peek = &(ditto->peeks[which]);
314 while ((ch = peek_fifo(fifo, peek)) > 0) {
317 waddch(win, (chtype) ch);
328 show_ditto(DITTO * data, int count, DDATA * ddata)
333 for (n = 0; n < count; n++) {
335 USING_SCREEN(data[n].screen, write_screen, (void *) ddata);
341 handle_screen(void *arg)
346 memset(&ddata, 0, sizeof(ddata));
347 ddata.ditto = (DITTO *) arg;
348 ddata.source = ddata.ditto->which1;
349 ddata.ditto -= ddata.source; /* -> base of array */
352 ch = read_screen(ddata.ditto->screen, &ddata);
353 if (ch == CTRL('D')) {
354 int later = (ddata.source ? ddata.source : -1);
357 for (j = ddata.ditto->length - 1; j > 0; --j) {
359 pthread_cancel(ddata.ditto[j].thread);
363 pthread_cancel(ddata.ditto[later].thread);
367 show_ditto(ddata.ditto, ddata.ditto->length, &ddata);
374 main(int argc, char *argv[])
385 if ((data = typeCalloc(DITTO, (size_t) argc)) == 0)
386 failed("calloc data");
390 for (j = 0; j < argc; j++) {
391 open_screen(&data[j], argv, argc, j);
396 * For multi-threaded operation, set up a reader for each of the screens.
397 * That uses blocking I/O rather than polling for input, so no calls to
398 * napms() are needed.
400 for (j = 0; j < argc; j++) {
401 (void) pthread_create(&(data[j].thread), NULL, handle_screen, &data[j]);
403 pthread_join(data[1].thread, NULL);
406 * Loop, reading characters from any of the inputs and writing to all
409 for (count = 0;; ++count) {
412 int which = (count % argc);
416 ddata.source = which;
419 ch = USING_SCREEN(data[which].screen, read_screen, &ddata);
420 if (ch == CTRL('D')) {
422 } else if (ch != ERR) {
423 show_ditto(data, argc, &ddata);
431 for (j = argc - 1; j >= 0; j--) {
432 USING_SCREEN(data[j].screen, close_screen, 0);
433 fprintf(data[j].output, "**Closed\r\n");
436 * Closing before a delscreen() helps ncurses determine that there
437 * is no valid output buffer, and can remove the setbuf() data.
439 fflush(data[j].output);
440 fclose(data[j].output);
441 delscreen(data[j].screen);
443 ExitProgram(EXIT_SUCCESS);