****************************************************************************/
/*
- * Author: Thomas E. Dickey <dickey@clark.net> 1998
+ * Author: Thomas E. Dickey (1998-on)
*
- * $Id: ditto.c,v 1.19 2008/04/12 23:37:32 tom Exp $
+ * $Id: ditto.c,v 1.26 2008/04/26 23:42:39 tom Exp $
*
* The program illustrates how to set up multiple screens from a single
- * program. Invoke the program by specifying another terminal on the same
- * machine by specifying its device, e.g.,
+ * program.
+ *
+ * If openpty() is supported, the command line parameters are titles for
+ * the windows showing each screen's data.
+ *
+ * If openpty() is not supported, you must invoke the program by specifying
+ * another terminal on the same machine by specifying its device, e.g.,
* ditto /dev/ttyp1
*/
#include <test.priv.h>
#include USE_OPENPTY_HEADER
#endif
+#define MAX_FIFO 256
+
+#define THIS_FIFO(n) ((n) % MAX_FIFO)
+#define NEXT_FIFO(n) THIS_FIFO((n) + 1)
+
+typedef struct {
+ unsigned long sequence;
+ int head;
+ int tail;
+ int data[MAX_FIFO];
+} FIFO;
+
+typedef struct {
+ unsigned long sequence;
+} PEEK;
+
+/*
+ * Data "owned" for a single screen. Each screen is divided into windows that
+ * show the text read from each terminal. Input from a given screen will also
+ * be read into one window per screen.
+ */
typedef struct {
FILE *input;
FILE *output;
- SCREEN *screen;
+ SCREEN *screen; /* this screen - curses internal data */
+ int length; /* length of windows[] and peeks[] */
+ char **titles; /* per-window titles */
+ WINDOW **windows; /* display data from each screen */
+ PEEK *peeks; /* indices for each screen's fifo */
+ FIFO fifo; /* fifo for this screen */
} DITTO;
+/*
+ * Structure used to pass multiple parameters via the use_screen()
+ * single-parameter interface.
+ */
+typedef struct {
+ int source; /* which screen did character come from */
+ int target; /* which screen is character going to */
+ DITTO *ditto; /* data for all screens */
+} DDATA;
+
static void
failed(const char *s)
{
ExitProgram(EXIT_FAILURE);
}
+/* Add to the head of the fifo, checking for overflow. */
+static void
+put_fifo(FIFO * fifo, int value)
+{
+ int next = NEXT_FIFO(fifo->head);
+ if (next == fifo->tail)
+ fifo->tail = NEXT_FIFO(fifo->tail);
+ fifo->data[next] = value;
+ fifo->head = next;
+ fifo->sequence += 1;
+}
+
+/* Get data from the tail (oldest part) of the fifo, returning -1 if no data.
+ * Since each screen can peek into the fifo, we do not update the tail index,
+ * but modify the peek-index.
+ *
+ * FIXME - test/workaround for case where fifo gets more than a buffer
+ * ahead of peek.
+ */
+static int
+peek_fifo(FIFO * fifo, PEEK * peek)
+{
+ int result = -1;
+ if (peek->sequence < fifo->sequence) {
+ peek->sequence += 1;
+ result = fifo->data[THIS_FIFO(peek->sequence)];
+ }
+ return result;
+}
+
static FILE *
open_tty(char *path)
{
return fp;
}
+static void
+init_screen(SCREEN *sp GCC_UNUSED, void *arg)
+{
+ DITTO *target = (DITTO *) arg;
+ int high, wide;
+ int k;
+
+ cbreak();
+ noecho();
+ scrollok(stdscr, TRUE);
+ nodelay(stdscr, TRUE);
+ box(stdscr, 0, 0);
+
+ target->windows = typeCalloc(WINDOW *, target->length);
+ target->peeks = typeCalloc(PEEK, target->length);
+
+ high = (LINES - 2) / target->length;
+ wide = (COLS - 2);
+ for (k = 0; k < target->length; ++k) {
+ WINDOW *outer = newwin(high, wide, 1 + (high * k), 1);
+ WINDOW *inner = derwin(outer, high - 2, wide - 2, 1, 1);
+
+ box(outer, 0, 0);
+ mvwaddstr(outer, 0, 2, target->titles[k]);
+ wnoutrefresh(outer);
+
+ scrollok(inner, TRUE);
+ nodelay(inner, TRUE);
+ keypad(inner, TRUE);
+
+ target->windows[k] = inner;
+ }
+ doupdate();
+}
+
+static void
+open_screen(DITTO * target, char **source, int length, int which)
+{
+ if (which != 0) {
+ target->input =
+ target->output = open_tty(source[which]);
+ } else {
+ target->input = stdin;
+ target->output = stdout;
+ }
+
+ target->titles = source;
+ target->length = length;
+ target->screen = newterm((char *) 0, /* assume $TERM is the same */
+ target->output,
+ target->input);
+
+ if (target->screen == 0)
+ failed("newterm");
+
+ (void) USING_SCREEN(target->screen, init_screen, target);
+}
+
static int
close_screen(SCREEN *sp GCC_UNUSED, void *arg GCC_UNUSED)
{
return endwin();
}
+/*
+ * Read data from the 'source' screen.
+ */
static int
-read_screen(SCREEN *sp GCC_UNUSED, void *arg GCC_UNUSED)
+read_screen(SCREEN *sp GCC_UNUSED, void *arg)
{
- return getch();
+ DDATA *data = (DDATA *) arg;
+ DITTO *ditto = &(data->ditto[data->source]);
+ WINDOW *win = ditto->windows[data->source];
+ int ch = wgetch(win);
+
+ if (ch > 0 && ch < 256)
+ put_fifo(&(ditto->fifo), ch);
+ else
+ ch = ERR;
+
+ return ch;
}
+/*
+ * Write all of the data that's in fifos for the 'target' screen.
+ */
static int
write_screen(SCREEN *sp GCC_UNUSED, void *arg GCC_UNUSED)
{
- addstr((char *) arg);
- refresh();
+ DDATA *data = (DDATA *) arg;
+ DITTO *ditto = &(data->ditto[data->target]);
+ bool changed = FALSE;
+ int which;
+
+ for (which = 0; which < ditto->length; ++which) {
+ WINDOW *win = ditto->windows[which];
+ FIFO *fifo = &(data->ditto[which].fifo);
+ PEEK *peek = &(ditto->peeks[which]);
+ int ch;
+
+ while ((ch = peek_fifo(fifo, peek)) > 0) {
+ changed = TRUE;
+
+ waddch(win, ch);
+ wnoutrefresh(win);
+ }
+ }
+
+ if (changed)
+ doupdate();
return OK;
}
static void
-show_ditto(DITTO * data, int count, char *msg)
+show_ditto(DITTO * data, int count, DDATA * ddata)
{
int n;
for (n = 0; n < count; n++) {
- USING_SCREEN(data[n].screen, write_screen, (void *) msg);
+ ddata->target = n;
+ USING_SCREEN(data[n].screen, write_screen, (void *) ddata);
}
}
if ((data = typeCalloc(DITTO, argc)) == 0)
failed("calloc data");
- data[0].input = stdin;
- data[0].output = stdout;
- for (j = 1; j < argc; j++) {
- data[j].input =
- data[j].output = open_tty(argv[j]);
- }
-
- /*
- * If we got this far, we have open connection(s) to the terminal(s).
- * Set up the screens.
- */
for (j = 0; j < argc; j++) {
- data[j].screen = newterm((char *) 0, /* assume $TERM is the same */
- data[j].output,
- data[j].input);
- if (data[j].screen == 0)
- failed("newterm");
- cbreak();
- noecho();
- scrollok(stdscr, TRUE);
- nodelay(stdscr, TRUE);
+ open_screen(&data[j], argv, argc, j);
}
/*
* of the screens.
*/
for (count = 0;; ++count) {
- char message[80];
+ DDATA ddata;
int ch;
int which = (count % argc);
napms(20);
- ch = USING_SCREEN(data[which].screen, read_screen, 0);
- if (ch == ERR) {
- continue;
- }
- if (ch == CTRL('D'))
+
+ ddata.source = which;
+ ddata.ditto = data;
+
+ ch = USING_SCREEN(data[which].screen, read_screen, &ddata);
+ if (ch == CTRL('D')) {
break;
- sprintf(message, "from[%d:%d] '%c' (%#x)\n", count, which, ch, ch);
- show_ditto(data, argc, message);
+ } else if (ch != ERR) {
+ show_ditto(data, argc, &ddata);
+ }
}
/*
for (j = argc - 1; j >= 0; j--) {
USING_SCREEN(data[j].screen, close_screen, 0);
fprintf(data[j].output, "**Closed\r\n");
+
+ /*
+ * Closing before a delscreen() helps ncurses determine that there
+ * is no valid output buffer, and can remove the setbuf() data.
+ */
fflush(data[j].output);
fclose(data[j].output);
delscreen(data[j].screen);
projects / ncurses.git / blobdiff