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30 * Author: Thomas E. Dickey (1998-on)
32 * $Id: ditto.c,v 1.28 2008/06/07 22:35:58 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>
54 #include USE_OPENPTY_HEADER
59 #define THIS_FIFO(n) ((n) % MAX_FIFO)
60 #define NEXT_FIFO(n) THIS_FIFO((n) + 1)
63 unsigned long sequence;
70 unsigned long sequence;
74 * Data "owned" for a single screen. Each screen is divided into windows that
75 * show the text read from each terminal. Input from a given screen will also
76 * be read into one window per screen.
81 SCREEN *screen; /* this screen - curses internal data */
82 int which1; /* this screen's index in DITTO[] array */
83 int length; /* length of windows[] and peeks[] */
84 char **titles; /* per-window titles */
85 WINDOW **windows; /* display data from each screen */
86 PEEK *peeks; /* indices for each screen's fifo */
87 FIFO fifo; /* fifo for this screen */
94 * Structure used to pass multiple parameters via the use_screen()
95 * single-parameter interface.
98 int source; /* which screen did character come from */
99 int target; /* which screen is character going to */
100 DITTO *ditto; /* data for all screens */
104 failed(const char *s)
107 ExitProgram(EXIT_FAILURE);
113 fprintf(stderr, "usage: ditto [terminal1 ...]\n");
114 ExitProgram(EXIT_FAILURE);
117 /* Add to the head of the fifo, checking for overflow. */
119 put_fifo(FIFO * fifo, int value)
121 int next = NEXT_FIFO(fifo->head);
122 if (next == fifo->tail)
123 fifo->tail = NEXT_FIFO(fifo->tail);
124 fifo->data[next] = value;
129 /* Get data from the tail (oldest part) of the fifo, returning -1 if no data.
130 * Since each screen can peek into the fifo, we do not update the tail index,
131 * but modify the peek-index.
133 * FIXME - test/workaround for case where fifo gets more than a buffer
137 peek_fifo(FIFO * fifo, PEEK * peek)
140 if (peek->sequence < fifo->sequence) {
142 result = fifo->data[THIS_FIFO(peek->sequence)];
154 char slave_name[1024];
158 if (openpty(&amaster, &aslave, slave_name, 0, 0) != 0)
160 if ((leaf = strrchr(slave_name, '/')) == 0) {
164 sprintf(s_option, "-S%s/%d", slave_name, aslave);
166 execlp("xterm", "xterm", s_option, "-title", path, (char *) 0);
169 fp = fdopen(amaster, "r+");
173 if (stat(path, &sb) < 0)
175 if ((sb.st_mode & S_IFMT) != S_IFCHR) {
179 fp = fopen(path, "r+");
182 printf("opened %s\n", path);
188 init_screen(SCREEN *sp GCC_UNUSED, void *arg)
190 DITTO *target = (DITTO *) arg;
196 scrollok(stdscr, TRUE);
199 target->windows = typeCalloc(WINDOW *, target->length);
200 target->peeks = typeCalloc(PEEK, target->length);
202 high = (LINES - 2) / target->length;
204 for (k = 0; k < target->length; ++k) {
205 WINDOW *outer = newwin(high, wide, 1 + (high * k), 1);
206 WINDOW *inner = derwin(outer, high - 2, wide - 2, 1, 1);
209 mvwaddstr(outer, 0, 2, target->titles[k]);
212 scrollok(inner, TRUE);
215 nodelay(inner, TRUE);
218 target->windows[k] = inner;
224 open_screen(DITTO * target, char **source, int length, int which1)
228 target->output = open_tty(source[which1]);
230 target->input = stdin;
231 target->output = stdout;
234 target->which1 = which1;
235 target->titles = source;
236 target->length = length;
237 target->screen = newterm((char *) 0, /* assume $TERM is the same */
241 if (target->screen == 0)
244 (void) USING_SCREEN(target->screen, init_screen, target);
248 close_screen(SCREEN *sp GCC_UNUSED, void *arg GCC_UNUSED)
256 * Read data from the 'source' screen.
259 read_screen(SCREEN *sp GCC_UNUSED, void *arg)
261 DDATA *data = (DDATA *) arg;
262 DITTO *ditto = &(data->ditto[data->source]);
263 WINDOW *win = ditto->windows[data->source];
264 int ch = wgetch(win);
266 if (ch > 0 && ch < 256)
267 put_fifo(&(ditto->fifo), ch);
275 * Write all of the data that's in fifos for the 'target' screen.
278 write_screen(SCREEN *sp GCC_UNUSED, void *arg GCC_UNUSED)
280 DDATA *data = (DDATA *) arg;
281 DITTO *ditto = &(data->ditto[data->target]);
282 bool changed = FALSE;
285 for (which = 0; which < ditto->length; ++which) {
286 WINDOW *win = ditto->windows[which];
287 FIFO *fifo = &(data->ditto[which].fifo);
288 PEEK *peek = &(ditto->peeks[which]);
291 while ((ch = peek_fifo(fifo, peek)) > 0) {
305 show_ditto(DITTO * data, int count, DDATA * ddata)
309 for (n = 0; n < count; n++) {
311 USING_SCREEN(data[n].screen, write_screen, (void *) ddata);
317 handle_screen(void *arg)
322 ddata.ditto = (DITTO *) arg;
323 ddata.source = ddata.ditto->which1;
325 ch = read_screen(ddata.ditto->screen, &ddata);
328 show_ditto(ddata.ditto, ddata.ditto->length, &ddata);
335 main(int argc, char *argv[])
346 if ((data = typeCalloc(DITTO, argc)) == 0)
347 failed("calloc data");
349 for (j = 0; j < argc; j++) {
350 open_screen(&data[j], argv, argc, j);
355 * For multi-threaded operation, set up a reader for each of the screens.
356 * That uses blocking I/O rather than polling for input, so no calls to
357 * napms() are needed.
359 for (j = 0; j < argc; j++) {
360 (void) pthread_create(&(data[j].thread), NULL, handle_screen, &data[j]);
364 * Loop, reading characters from any of the inputs and writing to all
367 for (count = 0;; ++count) {
370 int which = (count % argc);
374 ddata.source = which;
377 ch = USING_SCREEN(data[which].screen, read_screen, &ddata);
378 if (ch == CTRL('D')) {
380 } else if (ch != ERR) {
381 show_ditto(data, argc, &ddata);
389 for (j = argc - 1; j >= 0; j--) {
390 USING_SCREEN(data[j].screen, close_screen, 0);
391 fprintf(data[j].output, "**Closed\r\n");
394 * Closing before a delscreen() helps ncurses determine that there
395 * is no valid output buffer, and can remove the setbuf() data.
397 fflush(data[j].output);
398 fclose(data[j].output);
399 delscreen(data[j].screen);
401 ExitProgram(EXIT_SUCCESS);