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 1.40 2010/11/14 01:06:47 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 **windows;           /* display data from each screen */
  84     PEEK *peeks;                /* indices for each screen's fifo */
  85     FIFO fifo;                  /* fifo for this screen */
  86 #ifdef USE_PTHREADS
  87     pthread_t thread;
  88 #endif
  89 } DITTO;
  90
  91 /*
  92  * Structure used to pass multiple parameters via the use_screen()
  93  * single-parameter interface.
  94  */
  95 typedef struct {
  96     int source;                 /* which screen did character come from */
  97     int target;                 /* which screen is character going to */
  98     DITTO *ditto;               /* data for all screens */
  99 } DDATA;
 100
 101 static void
 102 failed(const char *s)
 103 {
 104     perror(s);
 105     ExitProgram(EXIT_FAILURE);
 106 }
 107
 108 static void
 109 usage(void)
 110 {
 111     fprintf(stderr, "usage: ditto [terminal1 ...]\n");
 112     ExitProgram(EXIT_FAILURE);
 113 }
 114
 115 /* Add to the head of the fifo, checking for overflow. */
 116 static void
 117 put_fifo(FIFO * fifo, int value)
 118 {
 119     int next = NEXT_FIFO(fifo->head);
 120     if (next == fifo->tail)
 121         fifo->tail = NEXT_FIFO(fifo->tail);
 122     fifo->data[next] = value;
 123     fifo->head = next;
 124     fifo->sequence += 1;
 125 }
 126
 127 /* Get data from the tail (oldest part) of the fifo, returning -1 if no data.
 128  * Since each screen can peek into the fifo, we do not update the tail index,
 129  * but modify the peek-index.
 130  *
 131  * FIXME - test/workaround for case where fifo gets more than a buffer
 132  * ahead of peek.
 133  */
 134 static int
 135 peek_fifo(FIFO * fifo, PEEK * peek)
 136 {
 137     int result = -1;
 138     if (peek->sequence < fifo->sequence) {
 139         result = fifo->data[THIS_FIFO(peek->sequence)];
 140         peek->sequence += 1;
 141     }
 142     return result;
 143 }
 144
 145 static FILE *
 146 open_tty(char *path)
 147 {
 148     FILE *fp;
 149 #ifdef USE_XTERM_PTY
 150     int amaster;
 151     int aslave;
 152     char slave_name[1024];
 153     char s_option[sizeof(slave_name) + 80];
 154
 155     if (openpty(&amaster, &aslave, slave_name, 0, 0) != 0
 156         || strlen(slave_name) > sizeof(slave_name) - 1)
 157         failed("openpty");
 158     if (strrchr(slave_name, '/') == 0) {
 159         errno = EISDIR;
 160         failed(slave_name);
 161     }
 162     sprintf(s_option, "-S%s/%d", slave_name, aslave);
 163     if (fork()) {
 164         execlp("xterm", "xterm", s_option, "-title", path, (char *) 0);
 165         _exit(0);
 166     }
 167     fp = fdopen(amaster, "r+");
 168     if (fp == 0)
 169         failed(path);
 170 #else
 171     struct stat sb;
 172
 173     if (stat(path, &sb) < 0)
 174         failed(path);
 175     if ((sb.st_mode & S_IFMT) != S_IFCHR) {
 176         errno = ENOTTY;
 177         failed(path);
 178     }
 179     fp = fopen(path, "r+");
 180     if (fp == 0)
 181         failed(path);
 182     printf("opened %s\n", path);
 183 #endif
 184     assert(fp != 0);
 185     return fp;
 186 }
 187
 188 static void
 189 init_screen(
 190 #if HAVE_USE_WINDOW
 191                SCREEN *sp GCC_UNUSED,
 192 #endif
 193                void *arg)
 194 {
 195     DITTO *target = (DITTO *) arg;
 196     int high, wide;
 197     int k;
 198
 199     cbreak();
 200     noecho();
 201     scrollok(stdscr, TRUE);
 202     box(stdscr, 0, 0);
 203
 204     target->windows = typeCalloc(WINDOW *, (size_t) target->length);
 205     target->peeks = typeCalloc(PEEK, (size_t) target->length);
 206
 207     high = (LINES - 2) / target->length;
 208     wide = (COLS - 2);
 209     for (k = 0; k < target->length; ++k) {
 210         WINDOW *outer = newwin(high, wide, 1 + (high * k), 1);
 211         WINDOW *inner = derwin(outer, high - 2, wide - 2, 1, 1);
 212
 213         box(outer, 0, 0);
 214         MvWAddStr(outer, 0, 2, target->titles[k]);
 215         wnoutrefresh(outer);
 216
 217         scrollok(inner, TRUE);
 218         keypad(inner, TRUE);
 219 #ifndef USE_PTHREADS
 220         nodelay(inner, TRUE);
 221 #endif
 222
 223         target->windows[k] = inner;
 224     }
 225     doupdate();
 226 }
 227
 228 static void
 229 open_screen(DITTO * target, char **source, int length, int which1)
 230 {
 231     if (which1 != 0) {
 232         target->input =
 233             target->output = open_tty(source[which1]);
 234     } else {
 235         target->input = stdin;
 236         target->output = stdout;
 237     }
 238
 239     target->which1 = which1;
 240     target->titles = source;
 241     target->length = length;
 242     target->fifo.head = -1;
 243     target->screen = newterm((char *) 0,        /* assume $TERM is the same */
 244                              target->output,
 245                              target->input);
 246
 247     if (target->screen == 0)
 248         failed("newterm");
 249
 250     (void) USING_SCREEN(target->screen, init_screen, target);
 251 }
 252
 253 static int
 254 close_screen(
 255 #if HAVE_USE_WINDOW
 256                 SCREEN *sp GCC_UNUSED,
 257 #endif
 258                 void *arg GCC_UNUSED)
 259 {
 260 #if HAVE_USE_WINDOW
 261     (void) sp;
 262 #endif
 263     (void) arg;
 264     return endwin();
 265 }
 266
 267 /*
 268  * Read data from the 'source' screen.
 269  */
 270 static int
 271 read_screen(
 272 #if HAVE_USE_WINDOW
 273                SCREEN *sp GCC_UNUSED,
 274 #endif
 275                void *arg)
 276 {
 277     DDATA *data = (DDATA *) arg;
 278     DITTO *ditto = &(data->ditto[data->source]);
 279     WINDOW *win = ditto->windows[data->source];
 280     int ch = wgetch(win);
 281
 282     if (ch > 0 && ch < 256)
 283         put_fifo(&(ditto->fifo), ch);
 284     else
 285         ch = ERR;
 286
 287     return ch;
 288 }
 289
 290 /*
 291  * Write all of the data that's in fifos for the 'target' screen.
 292  */
 293 static int
 294 write_screen(
 295 #if HAVE_USE_WINDOW
 296                 SCREEN *sp GCC_UNUSED,
 297 #endif
 298                 void *arg GCC_UNUSED)
 299 {
 300     DDATA *data = (DDATA *) arg;
 301     DITTO *ditto = &(data->ditto[data->target]);
 302     bool changed = FALSE;
 303     int which;
 304
 305     for (which = 0; which < ditto->length; ++which) {
 306         WINDOW *win = ditto->windows[which];
 307         FIFO *fifo = &(data->ditto[which].fifo);
 308         PEEK *peek = &(ditto->peeks[which]);
 309         int ch;
 310
 311         while ((ch = peek_fifo(fifo, peek)) > 0) {
 312             changed = TRUE;
 313
 314             waddch(win, (chtype) ch);
 315             wnoutrefresh(win);
 316         }
 317     }
 318
 319     if (changed)
 320         doupdate();
 321     return OK;
 322 }
 323
 324 static void
 325 show_ditto(DITTO * data, int count, DDATA * ddata)
 326 {
 327     int n;
 328
 329     (void) data;
 330     for (n = 0; n < count; n++) {
 331         ddata->target = n;
 332         USING_SCREEN(data[n].screen, write_screen, (void *) ddata);
 333     }
 334 }
 335
 336 #ifdef USE_PTHREADS
 337 static void *
 338 handle_screen(void *arg)
 339 {
 340     DDATA ddata;
 341     int ch;
 342
 343     memset(&ddata, 0, sizeof(ddata));
 344     ddata.ditto = (DITTO *) arg;
 345     ddata.source = ddata.ditto->which1;
 346     ddata.ditto -= ddata.source;        /* -> base of array */
 347
 348     for (;;) {
 349         ch = read_screen(ddata.ditto->screen, &ddata);
 350         if (ch == CTRL('D')) {
 351             int later = (ddata.source ? ddata.source : -1);
 352             int j;
 353
 354             for (j = ddata.ditto->length - 1; j > 0; --j) {
 355                 if (j != later) {
 356                     pthread_cancel(ddata.ditto[j].thread);
 357                 }
 358             }
 359             if (later > 0) {
 360                 pthread_cancel(ddata.ditto[later].thread);
 361             }
 362             break;
 363         }
 364         show_ditto(ddata.ditto, ddata.ditto->length, &ddata);
 365     }
 366     return NULL;
 367 }
 368 #endif
 369
 370 int
 371 main(int argc, char *argv[])
 372 {
 373     int j;
 374     DITTO *data;
 375 #ifndef USE_PTHREADS
 376     int count;
 377 #endif
 378
 379     if (argc <= 1)
 380         usage();
 381
 382     if ((data = typeCalloc(DITTO, (size_t) argc)) == 0)
 383         failed("calloc data");
 384
 385     assert(data != 0);
 386
 387     for (j = 0; j < argc; j++) {
 388         open_screen(&data[j], argv, argc, j);
 389     }
 390
 391 #ifdef USE_PTHREADS
 392     /*
 393      * For multi-threaded operation, set up a reader for each of the screens.
 394      * That uses blocking I/O rather than polling for input, so no calls to
 395      * napms() are needed.
 396      */
 397     for (j = 0; j < argc; j++) {
 398         (void) pthread_create(&(data[j].thread), NULL, handle_screen, &data[j]);
 399     }
 400     pthread_join(data[1].thread, NULL);
 401 #else
 402     /*
 403      * Loop, reading characters from any of the inputs and writing to all
 404      * of the screens.
 405      */
 406     for (count = 0;; ++count) {
 407         DDATA ddata;
 408         int ch;
 409         int which = (count % argc);
 410
 411         napms(20);
 412
 413         ddata.source = which;
 414         ddata.ditto = data;
 415
 416         ch = USING_SCREEN(data[which].screen, read_screen, &ddata);
 417         if (ch == CTRL('D')) {
 418             break;
 419         } else if (ch != ERR) {
 420             show_ditto(data, argc, &ddata);
 421         }
 422     }
 423 #endif
 424
 425     /*
 426      * Cleanup and exit
 427      */
 428     for (j = argc - 1; j >= 0; j--) {
 429         USING_SCREEN(data[j].screen, close_screen, 0);
 430         fprintf(data[j].output, "**Closed\r\n");
 431
 432         /*
 433          * Closing before a delscreen() helps ncurses determine that there
 434          * is no valid output buffer, and can remove the setbuf() data.
 435          */
 436         fflush(data[j].output);
 437         fclose(data[j].output);
 438         delscreen(data[j].screen);
 439     }
 440     ExitProgram(EXIT_SUCCESS);
 441 }