release/src/router/libncurses/test/ditto.c

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  28
  29 /*
  30  * Author: Thomas E. Dickey (1998-on)
  31  *
  32  * $Id: ditto.c,v 1.42 2012/11/24 20:16:18 tom Exp $
  33  *
  34  * The program illustrates how to set up multiple screens from a single
  35  * program.
  36  *
  37  * If openpty() is supported, the command line parameters are titles for
  38  * the windows showing each screen's data.
  39  *
  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.,
  42  *      ditto /dev/ttyp1
  43  */
  44 #include <test.priv.h>
  45 #include <sys/stat.h>
  46
  47 #ifdef USE_PTHREADS
  48 #include <pthread.h>
  49 #endif
  50
  51 #ifdef USE_XTERM_PTY
  52 #include USE_OPENPTY_HEADER
  53 #endif
  54
  55 #define MAX_FIFO 256
  56
  57 #define THIS_FIFO(n) ((n) % MAX_FIFO)
  58 #define NEXT_FIFO(n) THIS_FIFO((n) + 1)
  59
  60 typedef struct {
  61     unsigned long sequence;
  62     int head;
  63     int tail;
  64     int data[MAX_FIFO];
  65 } FIFO;
  66
  67 typedef struct {
  68     unsigned long sequence;
  69 } PEEK;
  70
  71 /*
  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.
  75  */
  76 typedef struct {
  77     FILE *input;
  78     FILE *output;
  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 */
  87 #ifdef USE_PTHREADS
  88     pthread_t thread;
  89 #endif
  90 } DITTO;
  91
  92 /*
  93  * Structure used to pass multiple parameters via the use_screen()
  94  * single-parameter interface.
  95  */
  96 typedef struct {
  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 */
 100 } DDATA;
 101
 102 static void failed(const char *) GCC_NORETURN;
 103 static void usage(void) GCC_NORETURN;
 104
 105 static void
 106 failed(const char *s)
 107 {
 108     perror(s);
 109     ExitProgram(EXIT_FAILURE);
 110 }
 111
 112 static void
 113 usage(void)
 114 {
 115     fprintf(stderr, "usage: ditto [terminal1 ...]\n");
 116     ExitProgram(EXIT_FAILURE);
 117 }
 118
 119 /* Add to the head of the fifo, checking for overflow. */
 120 static void
 121 put_fifo(FIFO * fifo, int value)
 122 {
 123     int next = NEXT_FIFO(fifo->head);
 124     if (next == fifo->tail)
 125         fifo->tail = NEXT_FIFO(fifo->tail);
 126     fifo->data[next] = value;
 127     fifo->head = next;
 128     fifo->sequence += 1;
 129 }
 130
 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.
 134  *
 135  * FIXME - test/workaround for case where fifo gets more than a buffer
 136  * ahead of peek.
 137  */
 138 static int
 139 peek_fifo(FIFO * fifo, PEEK * peek)
 140 {
 141     int result = -1;
 142     if (peek->sequence < fifo->sequence) {
 143         result = fifo->data[THIS_FIFO(peek->sequence)];
 144         peek->sequence += 1;
 145     }
 146     return result;
 147 }
 148
 149 static FILE *
 150 open_tty(char *path)
 151 {
 152     FILE *fp;
 153 #ifdef USE_XTERM_PTY
 154     int amaster;
 155     int aslave;
 156     char slave_name[1024];
 157     char s_option[sizeof(slave_name) + 80];
 158
 159     if (openpty(&amaster, &aslave, slave_name, 0, 0) != 0
 160         || strlen(slave_name) > sizeof(slave_name) - 1)
 161         failed("openpty");
 162     if (strrchr(slave_name, '/') == 0) {
 163         errno = EISDIR;
 164         failed(slave_name);
 165     }
 166     sprintf(s_option, "-S%s/%d", slave_name, aslave);
 167     if (fork()) {
 168         execlp("xterm", "xterm", s_option, "-title", path, (char *) 0);
 169         _exit(0);
 170     }
 171     fp = fdopen(amaster, "r+");
 172     if (fp == 0)
 173         failed(path);
 174 #else
 175     struct stat sb;
 176
 177     if (stat(path, &sb) < 0)
 178         failed(path);
 179     if ((sb.st_mode & S_IFMT) != S_IFCHR) {
 180         errno = ENOTTY;
 181         failed(path);
 182     }
 183     fp = fopen(path, "r+");
 184     if (fp == 0)
 185         failed(path);
 186     printf("opened %s\n", path);
 187 #endif
 188     assert(fp != 0);
 189     return fp;
 190 }
 191
 192 static void
 193 init_screen(
 194 #if HAVE_USE_WINDOW
 195                SCREEN *sp GCC_UNUSED,
 196 #endif
 197                void *arg)
 198 {
 199     DITTO *target = (DITTO *) arg;
 200     int high, wide;
 201     int k;
 202
 203     cbreak();
 204     noecho();
 205     scrollok(stdscr, TRUE);
 206     box(stdscr, 0, 0);
 207
 208     target->parents = typeCalloc(WINDOW *, (size_t) target->length);
 209     target->windows = typeCalloc(WINDOW *, (size_t) target->length);
 210     target->peeks = typeCalloc(PEEK, (size_t) target->length);
 211
 212     high = (LINES - 2) / target->length;
 213     wide = (COLS - 2);
 214     for (k = 0; k < target->length; ++k) {
 215         WINDOW *outer = newwin(high, wide, 1 + (high * k), 1);
 216         WINDOW *inner = derwin(outer, high - 2, wide - 2, 1, 1);
 217
 218         box(outer, 0, 0);
 219         MvWAddStr(outer, 0, 2, target->titles[k]);
 220         wnoutrefresh(outer);
 221
 222         scrollok(inner, TRUE);
 223         keypad(inner, TRUE);
 224 #ifndef USE_PTHREADS
 225         nodelay(inner, TRUE);
 226 #endif
 227
 228         target->parents[k] = outer;
 229         target->windows[k] = inner;
 230     }
 231     doupdate();
 232 }
 233
 234 static void
 235 open_screen(DITTO * target, char **source, int length, int which1)
 236 {
 237     if (which1 != 0) {
 238         target->input =
 239             target->output = open_tty(source[which1]);
 240     } else {
 241         target->input = stdin;
 242         target->output = stdout;
 243     }
 244
 245     target->which1 = which1;
 246     target->titles = source;
 247     target->length = length;
 248     target->fifo.head = -1;
 249     target->screen = newterm((char *) 0,        /* assume $TERM is the same */
 250                              target->output,
 251                              target->input);
 252
 253     if (target->screen == 0)
 254         failed("newterm");
 255
 256     (void) USING_SCREEN(target->screen, init_screen, target);
 257 }
 258
 259 static int
 260 close_screen(
 261 #if HAVE_USE_WINDOW
 262                 SCREEN *sp GCC_UNUSED,
 263 #endif
 264                 void *arg GCC_UNUSED)
 265 {
 266 #if HAVE_USE_WINDOW
 267     (void) sp;
 268 #endif
 269     (void) arg;
 270     return endwin();
 271 }
 272
 273 /*
 274  * Read data from the 'source' screen.
 275  */
 276 static int
 277 read_screen(
 278 #if HAVE_USE_WINDOW
 279                SCREEN *sp GCC_UNUSED,
 280 #endif
 281                void *arg)
 282 {
 283     DDATA *data = (DDATA *) arg;
 284     DITTO *ditto = &(data->ditto[data->source]);
 285     WINDOW *win = ditto->windows[data->source];
 286     int ch = wgetch(win);
 287
 288     if (ch > 0 && ch < 256)
 289         put_fifo(&(ditto->fifo), ch);
 290     else
 291         ch = ERR;
 292
 293     return ch;
 294 }
 295
 296 /*
 297  * Write all of the data that's in fifos for the 'target' screen.
 298  */
 299 static int
 300 write_screen(
 301 #if HAVE_USE_WINDOW
 302                 SCREEN *sp GCC_UNUSED,
 303 #endif
 304                 void *arg GCC_UNUSED)
 305 {
 306     DDATA *data = (DDATA *) arg;
 307     DITTO *ditto = &(data->ditto[data->target]);
 308     bool changed = FALSE;
 309     int which;
 310
 311     for (which = 0; which < ditto->length; ++which) {
 312         WINDOW *win = ditto->windows[which];
 313         FIFO *fifo = &(data->ditto[which].fifo);
 314         PEEK *peek = &(ditto->peeks[which]);
 315         int ch;
 316
 317         while ((ch = peek_fifo(fifo, peek)) > 0) {
 318             changed = TRUE;
 319
 320             waddch(win, (chtype) ch);
 321             wnoutrefresh(win);
 322         }
 323     }
 324
 325     if (changed)
 326         doupdate();
 327     return OK;
 328 }
 329
 330 static void
 331 show_ditto(DITTO * data, int count, DDATA * ddata)
 332 {
 333     int n;
 334
 335     (void) data;
 336     for (n = 0; n < count; n++) {
 337         ddata->target = n;
 338         USING_SCREEN(data[n].screen, write_screen, (void *) ddata);
 339     }
 340 }
 341
 342 #ifdef USE_PTHREADS
 343 static void *
 344 handle_screen(void *arg)
 345 {
 346     DDATA ddata;
 347     int ch;
 348
 349     memset(&ddata, 0, sizeof(ddata));
 350     ddata.ditto = (DITTO *) arg;
 351     ddata.source = ddata.ditto->which1;
 352     ddata.ditto -= ddata.source;        /* -> base of array */
 353
 354     for (;;) {
 355         ch = read_screen(ddata.ditto->screen, &ddata);
 356         if (ch == CTRL('D')) {
 357             int later = (ddata.source ? ddata.source : -1);
 358             int j;
 359
 360             for (j = ddata.ditto->length - 1; j > 0; --j) {
 361                 if (j != later) {
 362                     pthread_cancel(ddata.ditto[j].thread);
 363                 }
 364             }
 365             if (later > 0) {
 366                 pthread_cancel(ddata.ditto[later].thread);
 367             }
 368             break;
 369         }
 370         show_ditto(ddata.ditto, ddata.ditto->length, &ddata);
 371     }
 372     return NULL;
 373 }
 374 #endif
 375
 376 int
 377 main(int argc, char *argv[])
 378 {
 379     int j;
 380     DITTO *data;
 381 #ifndef USE_PTHREADS
 382     int count;
 383 #endif
 384
 385     if (argc <= 1)
 386         usage();
 387
 388     if ((data = typeCalloc(DITTO, (size_t) argc)) == 0)
 389         failed("calloc data");
 390
 391     assert(data != 0);
 392
 393     for (j = 0; j < argc; j++) {
 394         open_screen(&data[j], argv, argc, j);
 395     }
 396
 397 #ifdef USE_PTHREADS
 398     /*
 399      * For multi-threaded operation, set up a reader for each of the screens.
 400      * That uses blocking I/O rather than polling for input, so no calls to
 401      * napms() are needed.
 402      */
 403     for (j = 0; j < argc; j++) {
 404         (void) pthread_create(&(data[j].thread), NULL, handle_screen, &data[j]);
 405     }
 406     pthread_join(data[1].thread, NULL);
 407 #else
 408     /*
 409      * Loop, reading characters from any of the inputs and writing to all
 410      * of the screens.
 411      */
 412     for (count = 0;; ++count) {
 413         DDATA ddata;
 414         int ch;
 415         int which = (count % argc);
 416
 417         napms(20);
 418
 419         ddata.source = which;
 420         ddata.ditto = data;
 421
 422         ch = USING_SCREEN(data[which].screen, read_screen, &ddata);
 423         if (ch == CTRL('D')) {
 424             break;
 425         } else if (ch != ERR) {
 426             show_ditto(data, argc, &ddata);
 427         }
 428     }
 429 #endif
 430
 431     /*
 432      * Cleanup and exit
 433      */
 434     for (j = argc - 1; j >= 0; j--) {
 435         USING_SCREEN(data[j].screen, close_screen, 0);
 436         fprintf(data[j].output, "**Closed\r\n");
 437
 438         /*
 439          * Closing before a delscreen() helps ncurses determine that there
 440          * is no valid output buffer, and can remove the setbuf() data.
 441          */
 442         fflush(data[j].output);
 443         fclose(data[j].output);
 444         delscreen(data[j].screen);
 445     }
 446     ExitProgram(EXIT_SUCCESS);
 447 }