1 /****************************************************************************
2 * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc. *
4 * Permission is hereby granted, free of charge, to any person obtaining a *
5 * copy of this software and associated documentation files (the *
6 * "Software"), to deal in the Software without restriction, including *
7 * without limitation the rights to use, copy, modify, merge, publish, *
8 * distribute, distribute with modifications, sublicense, and/or sell *
9 * copies of the Software, and to permit persons to whom the Software is *
10 * furnished to do so, subject to the following conditions: *
12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
23 * Except as contained in this notice, the name(s) of the above copyright *
24 * holders shall not be used in advertising or otherwise to promote the *
25 * sale, use or other dealings in this Software without prior written *
27 ****************************************************************************/
30 * Author: Thomas E. Dickey (1998-on)
32 * $Id: ditto.c,v 1.26 2008/04/26 23:42:39 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>
49 #include USE_OPENPTY_HEADER
54 #define THIS_FIFO(n) ((n) % MAX_FIFO)
55 #define NEXT_FIFO(n) THIS_FIFO((n) + 1)
58 unsigned long sequence;
65 unsigned long sequence;
69 * Data "owned" for a single screen. Each screen is divided into windows that
70 * show the text read from each terminal. Input from a given screen will also
71 * be read into one window per screen.
76 SCREEN *screen; /* this screen - curses internal data */
77 int length; /* length of windows[] and peeks[] */
78 char **titles; /* per-window titles */
79 WINDOW **windows; /* display data from each screen */
80 PEEK *peeks; /* indices for each screen's fifo */
81 FIFO fifo; /* fifo for this screen */
85 * Structure used to pass multiple parameters via the use_screen()
86 * single-parameter interface.
89 int source; /* which screen did character come from */
90 int target; /* which screen is character going to */
91 DITTO *ditto; /* data for all screens */
98 ExitProgram(EXIT_FAILURE);
104 fprintf(stderr, "usage: ditto [terminal1 ...]\n");
105 ExitProgram(EXIT_FAILURE);
108 /* Add to the head of the fifo, checking for overflow. */
110 put_fifo(FIFO * fifo, int value)
112 int next = NEXT_FIFO(fifo->head);
113 if (next == fifo->tail)
114 fifo->tail = NEXT_FIFO(fifo->tail);
115 fifo->data[next] = value;
120 /* Get data from the tail (oldest part) of the fifo, returning -1 if no data.
121 * Since each screen can peek into the fifo, we do not update the tail index,
122 * but modify the peek-index.
124 * FIXME - test/workaround for case where fifo gets more than a buffer
128 peek_fifo(FIFO * fifo, PEEK * peek)
131 if (peek->sequence < fifo->sequence) {
133 result = fifo->data[THIS_FIFO(peek->sequence)];
145 char slave_name[1024];
149 if (openpty(&amaster, &aslave, slave_name, 0, 0) != 0)
151 if ((leaf = strrchr(slave_name, '/')) == 0) {
155 sprintf(s_option, "-S%s/%d", slave_name, aslave);
157 execlp("xterm", "xterm", s_option, "-title", path, (char *) 0);
160 fp = fdopen(amaster, "r+");
164 if (stat(path, &sb) < 0)
166 if ((sb.st_mode & S_IFMT) != S_IFCHR) {
170 fp = fopen(path, "r+");
173 printf("opened %s\n", path);
179 init_screen(SCREEN *sp GCC_UNUSED, void *arg)
181 DITTO *target = (DITTO *) arg;
187 scrollok(stdscr, TRUE);
188 nodelay(stdscr, TRUE);
191 target->windows = typeCalloc(WINDOW *, target->length);
192 target->peeks = typeCalloc(PEEK, target->length);
194 high = (LINES - 2) / target->length;
196 for (k = 0; k < target->length; ++k) {
197 WINDOW *outer = newwin(high, wide, 1 + (high * k), 1);
198 WINDOW *inner = derwin(outer, high - 2, wide - 2, 1, 1);
201 mvwaddstr(outer, 0, 2, target->titles[k]);
204 scrollok(inner, TRUE);
205 nodelay(inner, TRUE);
208 target->windows[k] = inner;
214 open_screen(DITTO * target, char **source, int length, int which)
218 target->output = open_tty(source[which]);
220 target->input = stdin;
221 target->output = stdout;
224 target->titles = source;
225 target->length = length;
226 target->screen = newterm((char *) 0, /* assume $TERM is the same */
230 if (target->screen == 0)
233 (void) USING_SCREEN(target->screen, init_screen, target);
237 close_screen(SCREEN *sp GCC_UNUSED, void *arg GCC_UNUSED)
245 * Read data from the 'source' screen.
248 read_screen(SCREEN *sp GCC_UNUSED, void *arg)
250 DDATA *data = (DDATA *) arg;
251 DITTO *ditto = &(data->ditto[data->source]);
252 WINDOW *win = ditto->windows[data->source];
253 int ch = wgetch(win);
255 if (ch > 0 && ch < 256)
256 put_fifo(&(ditto->fifo), ch);
264 * Write all of the data that's in fifos for the 'target' screen.
267 write_screen(SCREEN *sp GCC_UNUSED, void *arg GCC_UNUSED)
269 DDATA *data = (DDATA *) arg;
270 DITTO *ditto = &(data->ditto[data->target]);
271 bool changed = FALSE;
274 for (which = 0; which < ditto->length; ++which) {
275 WINDOW *win = ditto->windows[which];
276 FIFO *fifo = &(data->ditto[which].fifo);
277 PEEK *peek = &(ditto->peeks[which]);
280 while ((ch = peek_fifo(fifo, peek)) > 0) {
294 show_ditto(DITTO * data, int count, DDATA * ddata)
298 for (n = 0; n < count; n++) {
300 USING_SCREEN(data[n].screen, write_screen, (void *) ddata);
305 main(int argc GCC_UNUSED,
306 char *argv[]GCC_UNUSED)
315 if ((data = typeCalloc(DITTO, argc)) == 0)
316 failed("calloc data");
318 for (j = 0; j < argc; j++) {
319 open_screen(&data[j], argv, argc, j);
323 * Loop, reading characters from any of the inputs and writing to all
326 for (count = 0;; ++count) {
329 int which = (count % argc);
333 ddata.source = which;
336 ch = USING_SCREEN(data[which].screen, read_screen, &ddata);
337 if (ch == CTRL('D')) {
339 } else if (ch != ERR) {
340 show_ditto(data, argc, &ddata);
347 for (j = argc - 1; j >= 0; j--) {
348 USING_SCREEN(data[j].screen, close_screen, 0);
349 fprintf(data[j].output, "**Closed\r\n");
352 * Closing before a delscreen() helps ncurses determine that there
353 * is no valid output buffer, and can remove the setbuf() data.
355 fflush(data[j].output);
356 fclose(data[j].output);
357 delscreen(data[j].screen);
359 ExitProgram(EXIT_SUCCESS);