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30 * Author: Thomas E. Dickey (1998-on)
32 * $Id: ditto.c,v 1.36 2010/01/30 23:39:09 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
61 #define THIS_FIFO(n) ((n) % MAX_FIFO)
62 #define NEXT_FIFO(n) THIS_FIFO((n) + 1)
65 unsigned long sequence;
72 unsigned long sequence;
76 * Data "owned" for a single screen. Each screen is divided into windows that
77 * show the text read from each terminal. Input from a given screen will also
78 * be read into one window per screen.
83 SCREEN *screen; /* this screen - curses internal data */
84 int which1; /* this screen's index in DITTO[] array */
85 int length; /* length of windows[] and peeks[] */
86 char **titles; /* per-window titles */
87 WINDOW **windows; /* display data from each screen */
88 PEEK *peeks; /* indices for each screen's fifo */
89 FIFO fifo; /* fifo for this screen */
96 * Structure used to pass multiple parameters via the use_screen()
97 * single-parameter interface.
100 int source; /* which screen did character come from */
101 int target; /* which screen is character going to */
102 DITTO *ditto; /* data for all screens */
106 failed(const char *s)
109 ExitProgram(EXIT_FAILURE);
115 fprintf(stderr, "usage: ditto [terminal1 ...]\n");
116 ExitProgram(EXIT_FAILURE);
119 /* Add to the head of the fifo, checking for overflow. */
121 put_fifo(FIFO * fifo, int value)
123 int next = NEXT_FIFO(fifo->head);
124 if (next == fifo->tail)
125 fifo->tail = NEXT_FIFO(fifo->tail);
126 fifo->data[next] = value;
131 /* Get data from the tail (oldest part) of the fifo, returning -1 if no data.
132 * Since each screen can peek into the fifo, we do not update the tail index,
133 * but modify the peek-index.
135 * FIXME - test/workaround for case where fifo gets more than a buffer
139 peek_fifo(FIFO * fifo, PEEK * peek)
142 if (peek->sequence < fifo->sequence) {
143 result = fifo->data[THIS_FIFO(peek->sequence)];
156 char slave_name[1024];
157 char s_option[sizeof(slave_name) + 80];
160 if (openpty(&amaster, &aslave, slave_name, 0, 0) != 0
161 || strlen(slave_name) > sizeof(slave_name) - 1)
163 if ((leaf = strrchr(slave_name, '/')) == 0) {
167 sprintf(s_option, "-S%s/%d", slave_name, aslave);
169 execlp("xterm", "xterm", s_option, "-title", path, (char *) 0);
172 fp = fdopen(amaster, "r+");
178 if (stat(path, &sb) < 0)
180 if ((sb.st_mode & S_IFMT) != S_IFCHR) {
184 fp = fopen(path, "r+");
187 printf("opened %s\n", path);
196 SCREEN *sp GCC_UNUSED,
200 DITTO *target = (DITTO *) arg;
206 scrollok(stdscr, TRUE);
209 target->windows = typeCalloc(WINDOW *, (size_t) target->length);
210 target->peeks = typeCalloc(PEEK, (size_t) target->length);
212 high = (LINES - 2) / target->length;
214 for (k = 0; k < target->length; ++k) {
215 WINDOW *outer = newwin(high, wide, 1 + (high * k), 1);
216 WINDOW *inner = derwin(outer, high - 2, wide - 2, 1, 1);
219 mvwaddstr(outer, 0, 2, target->titles[k]);
222 scrollok(inner, TRUE);
225 nodelay(inner, TRUE);
228 target->windows[k] = inner;
234 open_screen(DITTO * target, char **source, int length, int which1)
238 target->output = open_tty(source[which1]);
240 target->input = stdin;
241 target->output = stdout;
244 target->which1 = which1;
245 target->titles = source;
246 target->length = length;
247 target->fifo.head = -1;
248 target->screen = newterm((char *) 0, /* assume $TERM is the same */
252 if (target->screen == 0)
255 (void) USING_SCREEN(target->screen, init_screen, target);
261 SCREEN *sp GCC_UNUSED,
263 void *arg GCC_UNUSED)
273 * Read data from the 'source' screen.
278 SCREEN *sp GCC_UNUSED,
282 DDATA *data = (DDATA *) arg;
283 DITTO *ditto = &(data->ditto[data->source]);
284 WINDOW *win = ditto->windows[data->source];
285 int ch = wgetch(win);
287 if (ch > 0 && ch < 256)
288 put_fifo(&(ditto->fifo), ch);
296 * Write all of the data that's in fifos for the 'target' screen.
301 SCREEN *sp GCC_UNUSED,
303 void *arg GCC_UNUSED)
305 DDATA *data = (DDATA *) arg;
306 DITTO *ditto = &(data->ditto[data->target]);
307 bool changed = FALSE;
310 for (which = 0; which < ditto->length; ++which) {
311 WINDOW *win = ditto->windows[which];
312 FIFO *fifo = &(data->ditto[which].fifo);
313 PEEK *peek = &(ditto->peeks[which]);
316 while ((ch = peek_fifo(fifo, peek)) > 0) {
319 waddch(win, (chtype) ch);
330 show_ditto(DITTO * data, int count, DDATA * ddata)
334 for (n = 0; n < count; n++) {
336 USING_SCREEN(data[n].screen, write_screen, (void *) ddata);
342 handle_screen(void *arg)
347 memset(&ddata, 0, sizeof(ddata));
348 ddata.ditto = (DITTO *) arg;
349 ddata.source = ddata.ditto->which1;
350 ddata.ditto -= ddata.source; /* -> base of array */
353 ch = read_screen(ddata.ditto->screen, &ddata);
354 if (ch == CTRL('D')) {
355 int later = (ddata.source ? ddata.source : -1);
358 for (j = ddata.ditto->length - 1; j > 0; --j) {
360 pthread_cancel(ddata.ditto[j].thread);
364 pthread_cancel(ddata.ditto[later].thread);
368 show_ditto(ddata.ditto, ddata.ditto->length, &ddata);
375 main(int argc, char *argv[])
386 if ((data = typeCalloc(DITTO, (size_t) argc)) == 0)
387 failed("calloc data");
389 for (j = 0; j < argc; j++) {
390 open_screen(&data[j], argv, argc, j);
395 * For multi-threaded operation, set up a reader for each of the screens.
396 * That uses blocking I/O rather than polling for input, so no calls to
397 * napms() are needed.
399 for (j = 0; j < argc; j++) {
400 (void) pthread_create(&(data[j].thread), NULL, handle_screen, &data[j]);
402 pthread_join(data[1].thread, NULL);
405 * Loop, reading characters from any of the inputs and writing to all
408 for (count = 0;; ++count) {
411 int which = (count % argc);
415 ddata.source = which;
418 ch = USING_SCREEN(data[which].screen, read_screen, &ddata);
419 if (ch == CTRL('D')) {
421 } else if (ch != ERR) {
422 show_ditto(data, argc, &ddata);
430 for (j = argc - 1; j >= 0; j--) {
431 USING_SCREEN(data[j].screen, close_screen, 0);
432 fprintf(data[j].output, "**Closed\r\n");
435 * Closing before a delscreen() helps ncurses determine that there
436 * is no valid output buffer, and can remove the setbuf() data.
438 fflush(data[j].output);
439 fclose(data[j].output);
440 delscreen(data[j].screen);
442 ExitProgram(EXIT_SUCCESS);