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30 * Author: Thomas E. Dickey (1998-on)
32 * $Id: ditto.c,v 1.43 2016/02/06 21:19:28 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 **parents; /* display boxes around each screen's data */
84 WINDOW **windows; /* display data from each screen */
85 PEEK *peeks; /* indices for each screen's fifo */
86 FIFO fifo; /* fifo for this screen */
93 * Structure used to pass multiple parameters via the use_screen()
94 * single-parameter interface.
97 int source; /* which screen did character come from */
98 int target; /* which screen is character going to */
99 DITTO *ditto; /* data for all screens */
102 static void failed(const char *) GCC_NORETURN;
103 static void usage(void) GCC_NORETURN;
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];
158 const char *xterm_prog = 0;
160 if ((xterm_prog = getenv("XTERM_PROG")) == 0)
161 xterm_prog = "xterm";
163 if (openpty(&amaster, &aslave, slave_name, 0, 0) != 0
164 || strlen(slave_name) > sizeof(slave_name) - 1)
166 if (strrchr(slave_name, '/') == 0) {
170 sprintf(s_option, "-S%s/%d", slave_name, aslave);
172 execlp(xterm_prog, xterm_prog, s_option, "-title", path, (char *) 0);
175 fp = fdopen(amaster, "r+");
181 if (stat(path, &sb) < 0)
183 if ((sb.st_mode & S_IFMT) != S_IFCHR) {
187 fp = fopen(path, "r+");
190 printf("opened %s\n", path);
199 SCREEN *sp GCC_UNUSED,
203 DITTO *target = (DITTO *) arg;
209 scrollok(stdscr, TRUE);
212 target->parents = typeCalloc(WINDOW *, (size_t) target->length);
213 target->windows = typeCalloc(WINDOW *, (size_t) target->length);
214 target->peeks = typeCalloc(PEEK, (size_t) target->length);
216 high = (LINES - 2) / target->length;
218 for (k = 0; k < target->length; ++k) {
219 WINDOW *outer = newwin(high, wide, 1 + (high * k), 1);
220 WINDOW *inner = derwin(outer, high - 2, wide - 2, 1, 1);
223 MvWAddStr(outer, 0, 2, target->titles[k]);
226 scrollok(inner, TRUE);
229 nodelay(inner, TRUE);
232 target->parents[k] = outer;
233 target->windows[k] = inner;
239 open_screen(DITTO * target, char **source, int length, int which1)
243 target->output = open_tty(source[which1]);
245 target->input = stdin;
246 target->output = stdout;
249 target->which1 = which1;
250 target->titles = source;
251 target->length = length;
252 target->fifo.head = -1;
253 target->screen = newterm((char *) 0, /* assume $TERM is the same */
257 if (target->screen == 0)
260 (void) USING_SCREEN(target->screen, init_screen, target);
266 SCREEN *sp GCC_UNUSED,
268 void *arg GCC_UNUSED)
278 * Read data from the 'source' screen.
283 SCREEN *sp GCC_UNUSED,
287 DDATA *data = (DDATA *) arg;
288 DITTO *ditto = &(data->ditto[data->source]);
289 WINDOW *win = ditto->windows[data->source];
290 int ch = wgetch(win);
292 if (ch > 0 && ch < 256)
293 put_fifo(&(ditto->fifo), ch);
301 * Write all of the data that's in fifos for the 'target' screen.
306 SCREEN *sp GCC_UNUSED,
308 void *arg GCC_UNUSED)
310 DDATA *data = (DDATA *) arg;
311 DITTO *ditto = &(data->ditto[data->target]);
312 bool changed = FALSE;
315 for (which = 0; which < ditto->length; ++which) {
316 WINDOW *win = ditto->windows[which];
317 FIFO *fifo = &(data->ditto[which].fifo);
318 PEEK *peek = &(ditto->peeks[which]);
321 while ((ch = peek_fifo(fifo, peek)) > 0) {
324 waddch(win, (chtype) ch);
335 show_ditto(DITTO * data, int count, DDATA * ddata)
340 for (n = 0; n < count; n++) {
342 USING_SCREEN(data[n].screen, write_screen, (void *) ddata);
348 handle_screen(void *arg)
353 memset(&ddata, 0, sizeof(ddata));
354 ddata.ditto = (DITTO *) arg;
355 ddata.source = ddata.ditto->which1;
356 ddata.ditto -= ddata.source; /* -> base of array */
359 ch = read_screen(ddata.ditto->screen, &ddata);
360 if (ch == CTRL('D')) {
361 int later = (ddata.source ? ddata.source : -1);
364 for (j = ddata.ditto->length - 1; j > 0; --j) {
366 pthread_cancel(ddata.ditto[j].thread);
370 pthread_cancel(ddata.ditto[later].thread);
374 show_ditto(ddata.ditto, ddata.ditto->length, &ddata);
381 main(int argc, char *argv[])
392 if ((data = typeCalloc(DITTO, (size_t) argc)) == 0)
393 failed("calloc data");
397 for (j = 0; j < argc; j++) {
398 open_screen(&data[j], argv, argc, j);
403 * For multi-threaded operation, set up a reader for each of the screens.
404 * That uses blocking I/O rather than polling for input, so no calls to
405 * napms() are needed.
407 for (j = 0; j < argc; j++) {
408 (void) pthread_create(&(data[j].thread), NULL, handle_screen, &data[j]);
410 pthread_join(data[1].thread, NULL);
413 * Loop, reading characters from any of the inputs and writing to all
416 for (count = 0;; ++count) {
419 int which = (count % argc);
423 ddata.source = which;
426 ch = USING_SCREEN(data[which].screen, read_screen, &ddata);
427 if (ch == CTRL('D')) {
429 } else if (ch != ERR) {
430 show_ditto(data, argc, &ddata);
438 for (j = argc - 1; j >= 0; j--) {
439 USING_SCREEN(data[j].screen, close_screen, 0);
440 fprintf(data[j].output, "**Closed\r\n");
443 * Closing before a delscreen() helps ncurses determine that there
444 * is no valid output buffer, and can remove the setbuf() data.
446 fflush(data[j].output);
447 fclose(data[j].output);
448 delscreen(data[j].screen);
450 ExitProgram(EXIT_SUCCESS);