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

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  28 /*
  29  * view.c -- a silly little viewer program
  30  *
  31  * written by Eric S. Raymond <esr@snark.thyrsus.com> December 1994
  32  * to test the scrolling code in ncurses.
  33  *
  34  * modified by Thomas Dickey <dickey@clark.net> July 1995 to demonstrate
  35  * the use of 'resizeterm()', and May 2000 to illustrate wide-character
  36  * handling.
  37  *
  38  * Takes a filename argument.  It's a simple file-viewer with various
  39  * scroll-up and scroll-down commands.
  40  *
  41  * n    -- scroll one line forward
  42  * p    -- scroll one line back
  43  *
  44  * Either command accepts a numeric prefix interpreted as a repeat count.
  45  * Thus, typing `5n' should scroll forward 5 lines in the file.
  46  *
  47  * The way you can tell this is working OK is that, in the trace file,
  48  * there should be one scroll operation plus a small number of line
  49  * updates, as opposed to a whole-page update.  This means the physical
  50  * scroll operation worked, and the refresh() code only had to do a
  51  * partial repaint.
  52  *
  53  * $Id: view.c,v 1.81 2010/11/14 01:06:02 tom Exp $
  54  */
  55
  56 #include <test.priv.h>
  57
  58 #include <time.h>
  59
  60 #undef CTRL                     /* conflict on AIX 5.2 with <sys/ioctl.h> */
  61
  62 #if HAVE_TERMIOS_H
  63 # include <termios.h>
  64 #else
  65 #if !defined(__MINGW32__)
  66 # include <sgtty.h>
  67 #endif
  68 #endif
  69
  70 #if !defined(sun) || !HAVE_TERMIOS_H
  71 # if HAVE_SYS_IOCTL_H
  72 #  include <sys/ioctl.h>
  73 # endif
  74 #endif
  75
  76 #define my_pair 1
  77
  78 /* This is needed to compile 'struct winsize' */
  79 #if NEED_PTEM_H
  80 #include <sys/stream.h>
  81 #include <sys/ptem.h>
  82 #endif
  83
  84 #if USE_WIDEC_SUPPORT
  85 #if HAVE_MBTOWC && HAVE_MBLEN
  86 #define reset_mbytes(state) IGNORE_RC(mblen(NULL, 0)), IGNORE_RC(mbtowc(NULL, NULL, 0))
  87 #define count_mbytes(buffer,length,state) mblen(buffer,length)
  88 #define check_mbytes(wch,buffer,length,state) \
  89         (int) mbtowc(&wch, buffer, length)
  90 #define state_unused
  91 #elif HAVE_MBRTOWC && HAVE_MBRLEN
  92 #define reset_mbytes(state) init_mb(state)
  93 #define count_mbytes(buffer,length,state) mbrlen(buffer,length,&state)
  94 #define check_mbytes(wch,buffer,length,state) \
  95         (int) mbrtowc(&wch, buffer, length, &state)
  96 #else
  97 make an error
  98 #endif
  99 #endif                          /* USE_WIDEC_SUPPORT */
 100
 101 static RETSIGTYPE finish(int sig) GCC_NORETURN;
 102 static void show_all(const char *tag);
 103
 104 #if defined(SIGWINCH) && defined(TIOCGWINSZ) && HAVE_RESIZE_TERM
 105 #define CAN_RESIZE 1
 106 #else
 107 #define CAN_RESIZE 0
 108 #endif
 109
 110 #if CAN_RESIZE
 111 static RETSIGTYPE adjust(int sig);
 112 static int interrupted;
 113 #endif
 114
 115 static bool waiting = FALSE;
 116 static int shift = 0;
 117 static bool try_color = FALSE;
 118
 119 static char *fname;
 120 static NCURSES_CH_T **vec_lines;
 121 static NCURSES_CH_T **lptr;
 122 static int num_lines;
 123
 124 static void
 125 usage(void)
 126 {
 127     static const char *msg[] =
 128     {
 129         "Usage: view [options] file"
 130         ,""
 131         ,"Options:"
 132         ," -c       use color if terminal supports it"
 133         ," -i       ignore INT, QUIT, TERM signals"
 134         ," -n NUM   specify maximum number of lines (default 1000)"
 135 #if defined(KEY_RESIZE)
 136         ," -r       use old-style sigwinch handler rather than KEY_RESIZE"
 137 #endif
 138 #ifdef TRACE
 139         ," -t       trace screen updates"
 140         ," -T NUM   specify trace mask"
 141 #endif
 142     };
 143     size_t n;
 144     for (n = 0; n < SIZEOF(msg); n++)
 145         fprintf(stderr, "%s\n", msg[n]);
 146     ExitProgram(EXIT_FAILURE);
 147 }
 148
 149 static int
 150 ch_len(NCURSES_CH_T * src)
 151 {
 152     int result = 0;
 153 #if USE_WIDEC_SUPPORT
 154     int count;
 155 #endif
 156
 157 #if USE_WIDEC_SUPPORT
 158     for (;;) {
 159         TEST_CCHAR(src, count, {
 160             ++result;
 161             ++src;
 162         }
 163         , {
 164             break;
 165         })
 166     }
 167 #else
 168     while (*src++)
 169         result++;
 170 #endif
 171     return result;
 172 }
 173
 174 /*
 175  * Allocate a string into an array of chtype's.  If UTF-8 mode is
 176  * active, translate the string accordingly.
 177  */
 178 static NCURSES_CH_T *
 179 ch_dup(char *src)
 180 {
 181     unsigned len = (unsigned) strlen(src);
 182     NCURSES_CH_T *dst = typeMalloc(NCURSES_CH_T, len + 1);
 183     unsigned j, k;
 184 #if USE_WIDEC_SUPPORT
 185     wchar_t wstr[CCHARW_MAX + 1];
 186     wchar_t wch;
 187     int l = 0;
 188     size_t rc;
 189     int width;
 190 #ifndef state_unused
 191     mbstate_t state;
 192 #endif
 193 #endif /* USE_WIDEC_SUPPORT */
 194
 195 #if USE_WIDEC_SUPPORT
 196     reset_mbytes(state);
 197 #endif
 198     for (j = k = 0; j < len; j++) {
 199 #if USE_WIDEC_SUPPORT
 200         rc = (size_t) check_mbytes(wch, src + j, len - j, state);
 201         if (rc == (size_t) -1 || rc == (size_t) -2)
 202             break;
 203         j += rc - 1;
 204         if ((width = wcwidth(wch)) < 0)
 205             break;
 206         if ((width > 0 && l > 0) || l == CCHARW_MAX) {
 207             wstr[l] = L'\0';
 208             l = 0;
 209             if (setcchar(dst + k, wstr, 0, 0, NULL) != OK)
 210                 break;
 211             ++k;
 212         }
 213         if (width == 0 && l == 0)
 214             wstr[l++] = L' ';
 215         wstr[l++] = wch;
 216 #else
 217         dst[k++] = (chtype) UChar(src[j]);
 218 #endif
 219     }
 220 #if USE_WIDEC_SUPPORT
 221     if (l > 0) {
 222         wstr[l] = L'\0';
 223         if (setcchar(dst + k, wstr, 0, 0, NULL) == OK)
 224             ++k;
 225     }
 226     wstr[0] = L'\0';
 227     setcchar(dst + k, wstr, 0, 0, NULL);
 228 #else
 229     dst[k] = 0;
 230 #endif
 231     return dst;
 232 }
 233
 234 int
 235 main(int argc, char *argv[])
 236 {
 237     int MAXLINES = 1000;
 238     FILE *fp;
 239     char buf[BUFSIZ];
 240     int i;
 241     int my_delay = 0;
 242     NCURSES_CH_T **olptr;
 243     int value = 0;
 244     bool done = FALSE;
 245     bool got_number = FALSE;
 246 #if CAN_RESIZE
 247     bool nonposix_resize = FALSE;
 248 #endif
 249     const char *my_label = "Input";
 250
 251     setlocale(LC_ALL, "");
 252
 253 #ifndef NCURSES_VERSION
 254     /*
 255      * We know ncurses will catch SIGINT if we don't establish our own handler.
 256      * Other versions of curses may/may not catch it.
 257      */
 258     (void) signal(SIGINT, finish);      /* arrange interrupts to terminate */
 259 #endif
 260
 261     while ((i = getopt(argc, argv, "cin:rtT:")) != -1) {
 262         switch (i) {
 263         case 'c':
 264             try_color = TRUE;
 265             break;
 266         case 'i':
 267             CATCHALL(SIG_IGN);
 268             break;
 269         case 'n':
 270             if ((MAXLINES = atoi(optarg)) < 1 ||
 271                 (MAXLINES + 2) <= 1)
 272                 usage();
 273             break;
 274 #if CAN_RESIZE
 275         case 'r':
 276             nonposix_resize = TRUE;
 277             break;
 278 #endif
 279 #ifdef TRACE
 280         case 'T':
 281             trace((unsigned) atoi(optarg));
 282             break;
 283         case 't':
 284             trace(TRACE_CALLS);
 285             break;
 286 #endif
 287         default:
 288             usage();
 289         }
 290     }
 291     if (optind + 1 != argc)
 292         usage();
 293
 294     if ((vec_lines = typeCalloc(NCURSES_CH_T *, (size_t) MAXLINES + 2)) == 0)
 295         usage();
 296
 297     assert(vec_lines != 0);
 298
 299     fname = argv[optind];
 300     if ((fp = fopen(fname, "r")) == 0) {
 301         perror(fname);
 302         ExitProgram(EXIT_FAILURE);
 303     }
 304 #if CAN_RESIZE
 305     if (nonposix_resize)
 306         (void) signal(SIGWINCH, adjust);        /* arrange interrupts to resize */
 307 #endif
 308
 309     /* slurp the file */
 310     for (lptr = &vec_lines[0]; (lptr - vec_lines) < MAXLINES; lptr++) {
 311         char temp[BUFSIZ], *s, *d;
 312         int col;
 313
 314         if (fgets(buf, sizeof(buf), fp) == 0)
 315             break;
 316
 317         /* convert tabs so that shift will work properly */
 318         for (s = buf, d = temp, col = 0; (*d = *s) != '\0'; s++) {
 319             if (*d == '\n') {
 320                 *d = '\0';
 321                 break;
 322             } else if (*d == '\t') {
 323                 col = (col | 7) + 1;
 324                 while ((d - temp) != col)
 325                     *d++ = ' ';
 326             } else
 327 #if USE_WIDEC_SUPPORT
 328                 col++, d++;
 329 #else
 330             if (isprint(UChar(*d))) {
 331                 col++;
 332                 d++;
 333             } else {
 334                 sprintf(d, "\\%03o", UChar(*s));
 335                 d += strlen(d);
 336                 col = (int) (d - temp);
 337             }
 338 #endif
 339         }
 340         *lptr = ch_dup(temp);
 341     }
 342     (void) fclose(fp);
 343     num_lines = (int) (lptr - vec_lines);
 344
 345     (void) initscr();           /* initialize the curses library */
 346     keypad(stdscr, TRUE);       /* enable keyboard mapping */
 347     (void) nonl();              /* tell curses not to do NL->CR/NL on output */
 348     (void) cbreak();            /* take input chars one at a time, no wait for \n */
 349     (void) noecho();            /* don't echo input */
 350     nodelay(stdscr, TRUE);
 351     idlok(stdscr, TRUE);        /* allow use of insert/delete line */
 352
 353     if (try_color) {
 354         if (has_colors()) {
 355             start_color();
 356             init_pair(my_pair, COLOR_WHITE, COLOR_BLUE);
 357             bkgd(COLOR_PAIR(my_pair));
 358         } else {
 359             try_color = FALSE;
 360         }
 361     }
 362
 363     lptr = vec_lines;
 364     while (!done) {
 365         int n, c;
 366
 367         if (!got_number)
 368             show_all(my_label);
 369
 370         for (;;) {
 371 #if CAN_RESIZE
 372             if (interrupted) {
 373                 adjust(0);
 374                 my_label = "interrupt";
 375             }
 376 #endif
 377             waiting = TRUE;
 378             c = getch();
 379             waiting = FALSE;
 380             if ((c < 127) && isdigit(c)) {
 381                 if (!got_number) {
 382                     MvPrintw(0, 0, "Count: ");
 383                     clrtoeol();
 384                 }
 385                 addch(UChar(c));
 386                 value = 10 * value + (c - '0');
 387                 got_number = TRUE;
 388             } else
 389                 break;
 390         }
 391         if (got_number && value) {
 392             n = value;
 393         } else {
 394             n = 1;
 395         }
 396
 397         if (c != ERR)
 398             my_label = keyname(c);
 399         switch (c) {
 400         case KEY_DOWN:
 401         case 'n':
 402             olptr = lptr;
 403             for (i = 0; i < n; i++)
 404                 if ((lptr - vec_lines) < (num_lines - LINES + 1))
 405                     lptr++;
 406                 else
 407                     break;
 408             scrl((int) (lptr - olptr));
 409             break;
 410
 411         case KEY_UP:
 412         case 'p':
 413             olptr = lptr;
 414             for (i = 0; i < n; i++)
 415                 if (lptr > vec_lines)
 416                     lptr--;
 417                 else
 418                     break;
 419             scrl((int) (lptr - olptr));
 420             break;
 421
 422         case 'h':
 423         case KEY_HOME:
 424             lptr = vec_lines;
 425             break;
 426
 427         case 'e':
 428         case KEY_END:
 429             if (num_lines > LINES)
 430                 lptr = vec_lines + num_lines - LINES + 1;
 431             else
 432                 lptr = vec_lines;
 433             break;
 434
 435         case 'r':
 436         case KEY_RIGHT:
 437             shift += n;
 438             break;
 439
 440         case 'l':
 441         case KEY_LEFT:
 442             shift -= n;
 443             if (shift < 0) {
 444                 shift = 0;
 445                 beep();
 446             }
 447             break;
 448
 449         case 'q':
 450             done = TRUE;
 451             break;
 452
 453 #ifdef KEY_RESIZE
 454         case KEY_RESIZE:        /* ignore this; ncurses will repaint */
 455             break;
 456 #endif
 457         case 's':
 458             if (got_number) {
 459                 halfdelay(my_delay = n);
 460             } else {
 461                 nodelay(stdscr, FALSE);
 462                 my_delay = -1;
 463             }
 464             break;
 465         case ' ':
 466             nodelay(stdscr, TRUE);
 467             my_delay = 0;
 468             break;
 469         case ERR:
 470             if (!my_delay)
 471                 napms(50);
 472             break;
 473         default:
 474             beep();
 475             break;
 476         }
 477         if (c >= KEY_MIN || (c > 0 && !isdigit(c))) {
 478             got_number = FALSE;
 479             value = 0;
 480         }
 481     }
 482
 483     finish(0);                  /* we're done */
 484 }
 485
 486 static RETSIGTYPE
 487 finish(int sig)
 488 {
 489     endwin();
 490 #if NO_LEAKS
 491     if (vec_lines != 0) {
 492         int n;
 493         for (n = 0; n < num_lines; ++n) {
 494             free(vec_lines[n]);
 495         }
 496         free(vec_lines);
 497     }
 498 #endif
 499     ExitProgram(sig != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
 500 }
 501
 502 #if CAN_RESIZE
 503 /*
 504  * This uses functions that are "unsafe", but it seems to work on SunOS.
 505  * Usually: the "unsafe" refers to the functions that POSIX lists which may be
 506  * called from a signal handler.  Those do not include buffered I/O, which is
 507  * used for instance in wrefresh().  To be really portable, you should use the
 508  * KEY_RESIZE return (which relies on ncurses' sigwinch handler).
 509  *
 510  * The 'wrefresh(curscr)' is needed to force the refresh to start from the top
 511  * of the screen -- some xterms mangle the bitmap while resizing.
 512  */
 513 static RETSIGTYPE
 514 adjust(int sig)
 515 {
 516     if (waiting || sig == 0) {
 517         struct winsize size;
 518
 519         if (ioctl(fileno(stdout), TIOCGWINSZ, &size) == 0) {
 520             resize_term(size.ws_row, size.ws_col);
 521             wrefresh(curscr);
 522             show_all(sig ? "SIGWINCH" : "interrupt");
 523         }
 524         interrupted = FALSE;
 525     } else {
 526         interrupted = TRUE;
 527     }
 528     (void) signal(SIGWINCH, adjust);    /* some systems need this */
 529 }
 530 #endif /* CAN_RESIZE */
 531
 532 static void
 533 show_all(const char *tag)
 534 {
 535     int i;
 536     char temp[BUFSIZ];
 537     NCURSES_CH_T *s;
 538     time_t this_time;
 539
 540 #if CAN_RESIZE
 541     sprintf(temp, "%.20s (%3dx%3d) col %d ", tag, LINES, COLS, shift);
 542     i = (int) strlen(temp);
 543     if ((i + 7) < (int) sizeof(temp)) {
 544         sprintf(temp + i, "view %.*s",
 545                 (int) (sizeof(temp) - 7 - (size_t) i),
 546                 fname);
 547     }
 548 #else
 549     (void) tag;
 550     sprintf(temp, "view %.*s", (int) sizeof(temp) - 7, fname);
 551 #endif
 552     move(0, 0);
 553     printw("%.*s", COLS, temp);
 554     clrtoeol();
 555     this_time = time((time_t *) 0);
 556     strcpy(temp, ctime(&this_time));
 557     if ((i = (int) strlen(temp)) != 0) {
 558         temp[--i] = 0;
 559         if (move(0, COLS - i - 2) != ERR)
 560             printw("  %s", temp);
 561     }
 562
 563     scrollok(stdscr, FALSE);    /* prevent screen from moving */
 564     for (i = 1; i < LINES; i++) {
 565         move(i, 0);
 566         printw("%3ld:", (long) (lptr + i - vec_lines));
 567         clrtoeol();
 568         if ((s = lptr[i - 1]) != 0) {
 569             int len = ch_len(s);
 570             if (len > shift) {
 571 #if USE_WIDEC_SUPPORT
 572                 add_wchstr(s + shift);
 573 #else
 574                 addchstr(s + shift);
 575 #endif
 576             }
 577 #if defined(NCURSES_VERSION) || defined(HAVE_WCHGAT)
 578             if (try_color)
 579                 wchgat(stdscr, -1, A_NORMAL, my_pair, NULL);
 580 #endif
 581         }
 582     }
 583     setscrreg(1, LINES - 1);
 584     scrollok(stdscr, TRUE);
 585     refresh();
 586 }