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/*
* Author: Thomas E. Dickey (1998-on)
*
* $Id: ditto.c,v 1.32 2008/08/04 13:21:41 tom Exp $
*
* The program illustrates how to set up multiple screens from a single
* 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 <sys/stat.h>
#include <errno.h>
#ifdef USE_PTHREADS
#include <pthread.h>
#endif
#ifdef USE_XTERM_PTY
#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; /* this screen - curses internal data */
int which1; /* this screen's index in DITTO[] array */
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 */
#ifdef USE_PTHREADS
pthread_t thread;
#endif
} 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)
{
perror(s);
ExitProgram(EXIT_FAILURE);
}
static void
usage(void)
{
fprintf(stderr, "usage: ditto [terminal1 ...]\n");
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)
{
FILE *fp;
#ifdef USE_XTERM_PTY
int amaster;
int aslave;
char slave_name[1024];
char s_option[sizeof(slave_name) + 80];
char *leaf;
if (openpty(&amaster, &aslave, slave_name, 0, 0) != 0
|| strlen(slave_name) > sizeof(slave_name) - 1)
failed("openpty");
if ((leaf = strrchr(slave_name, '/')) == 0) {
errno = EISDIR;
failed(slave_name);
}
sprintf(s_option, "-S%s/%d", slave_name, aslave);
if (fork()) {
execlp("xterm", "xterm", s_option, "-title", path, (char *) 0);
_exit(0);
}
fp = fdopen(amaster, "r+");
if (fp == 0)
failed(path);
#else
struct stat sb;
if (stat(path, &sb) < 0)
failed(path);
if ((sb.st_mode & S_IFMT) != S_IFCHR) {
errno = ENOTTY;
failed(path);
}
fp = fopen(path, "r+");
if (fp == 0)
failed(path);
printf("opened %s\n", path);
#endif
assert(fp != 0);
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);
box(stdscr, 0, 0);
target->windows = typeCalloc(WINDOW *, (size_t) target->length);
target->peeks = typeCalloc(PEEK, (size_t) 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);
keypad(inner, TRUE);
#ifndef USE_PTHREADS
nodelay(inner, TRUE);
#endif
target->windows[k] = inner;
}
doupdate();
}
static void
open_screen(DITTO * target, char **source, int length, int which1)
{
if (which1 != 0) {
target->input =
target->output = open_tty(source[which1]);
} else {
target->input = stdin;
target->output = stdout;
}
target->which1 = which1;
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)
{
(void) sp;
(void) arg;
return endwin();
}
/*
* Read data from the 'source' screen.
*/
static int
read_screen(SCREEN *sp GCC_UNUSED, void *arg)
{
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)
{
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, (chtype) ch);
wnoutrefresh(win);
}
}
if (changed)
doupdate();
return OK;
}
static void
show_ditto(DITTO * data, int count, DDATA * ddata)
{
int n;
for (n = 0; n < count; n++) {
ddata->target = n;
USING_SCREEN(data[n].screen, write_screen, (void *) ddata);
}
}
#ifdef USE_PTHREADS
static void *
handle_screen(void *arg)
{
DDATA ddata;
int ch;
memset(&ddata, 0, sizeof(ddata));
ddata.ditto = (DITTO *) arg;
ddata.source = ddata.ditto->which1;
ddata.ditto -= ddata.source; /* -> base of array */
for (;;) {
ch = read_screen(ddata.ditto->screen, &ddata);
if (ch == CTRL('D')) {
int later = (ddata.source ? ddata.source : -1);
int j;
for (j = ddata.ditto->length - 1; j > 0; --j) {
if (j != later) {
pthread_cancel(ddata.ditto[j].thread);
}
}
if (later > 0) {
pthread_cancel(ddata.ditto[later].thread);
}
break;
}
show_ditto(ddata.ditto, ddata.ditto->length, &ddata);
}
return NULL;
}
#endif
int
main(int argc, char *argv[])
{
int j;
DITTO *data;
#ifndef USE_PTHREADS
int count;
#endif
if (argc <= 1)
usage();
if ((data = typeCalloc(DITTO, (size_t) argc)) == 0)
failed("calloc data");
for (j = 0; j < argc; j++) {
open_screen(&data[j], argv, argc, j);
}
#ifdef USE_PTHREADS
/*
* For multi-threaded operation, set up a reader for each of the screens.
* That uses blocking I/O rather than polling for input, so no calls to
* napms() are needed.
*/
for (j = 0; j < argc; j++) {
(void) pthread_create(&(data[j].thread), NULL, handle_screen, &data[j]);
}
pthread_join(data[1].thread, NULL);
#else
/*
* Loop, reading characters from any of the inputs and writing to all
* of the screens.
*/
for (count = 0;; ++count) {
DDATA ddata;
int ch;
int which = (count % argc);
napms(20);
ddata.source = which;
ddata.ditto = data;
ch = USING_SCREEN(data[which].screen, read_screen, &ddata);
if (ch == CTRL('D')) {
break;
} else if (ch != ERR) {
show_ditto(data, argc, &ddata);
}
}
#endif
/*
* Cleanup and exit
*/
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);
}
ExitProgram(EXIT_SUCCESS);
}
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