contrib/ncurses-5.4/test/view.c

   1 /*
   2  * view.c -- a silly little viewer program
   3  *
   4  * written by Eric S. Raymond <esr@snark.thyrsus.com> December 1994
   5  * to test the scrolling code in ncurses.
   6  *
   7  * modified by Thomas Dickey <dickey@clark.net> July 1995 to demonstrate
   8  * the use of 'resizeterm()', and May 2000 to illustrate wide-character
   9  * handling.
  10  *
  11  * Takes a filename argument.  It's a simple file-viewer with various
  12  * scroll-up and scroll-down commands.
  13  *
  14  * n    -- scroll one line forward
  15  * p    -- scroll one line back
  16  *
  17  * Either command accepts a numeric prefix interpreted as a repeat count.
  18  * Thus, typing `5n' should scroll forward 5 lines in the file.
  19  *
  20  * The way you can tell this is working OK is that, in the trace file,
  21  * there should be one scroll operation plus a small number of line
  22  * updates, as opposed to a whole-page update.  This means the physical
  23  * scroll operation worked, and the refresh() code only had to do a
  24  * partial repaint.
  25  *
  26  * $Id: view.c,v 1.57 2003/05/17 21:58:43 tom Exp $
  27  */
  28
  29 #include <time.h>
  30
  31 #include <test.priv.h>
  32
  33 #if HAVE_TERMIOS_H
  34 # include <termios.h>
  35 #else
  36 # include <sgtty.h>
  37 #endif
  38
  39 #if !defined(sun) || !HAVE_TERMIOS_H
  40 # if HAVE_SYS_IOCTL_H
  41 #  include <sys/ioctl.h>
  42 # endif
  43 #endif
  44
  45 #define my_pair 1
  46
  47 /* This is needed to compile 'struct winsize' */
  48 #if NEED_PTEM_H
  49 #include <sys/stream.h>
  50 #include <sys/ptem.h>
  51 #endif
  52
  53 static RETSIGTYPE finish(int sig) GCC_NORETURN;
  54 static void show_all(const char *tag);
  55
  56 #if defined(SIGWINCH) && defined(TIOCGWINSZ) && HAVE_RESIZE_TERM
  57 #define CAN_RESIZE 1
  58 #else
  59 #define CAN_RESIZE 0
  60 #endif
  61
  62 #if CAN_RESIZE
  63 static RETSIGTYPE adjust(int sig);
  64 static int interrupted;
  65 #endif
  66
  67 static bool waiting = FALSE;
  68 static int shift = 0;
  69 static bool try_color = FALSE;
  70
  71 static char *fname;
  72 static NCURSES_CH_T **my_lines;
  73 static NCURSES_CH_T **lptr;
  74
  75 static void
  76 usage(void)
  77 {
  78     static const char *msg[] =
  79     {
  80         "Usage: view [options] file"
  81         ,""
  82         ,"Options:"
  83         ," -c       use color if terminal supports it"
  84         ," -i       ignore INT, QUIT, TERM signals"
  85         ," -n NUM   specify maximum number of lines (default 1000)"
  86 #if defined(KEY_RESIZE)
  87         ," -r       use old-style sigwinch handler rather than KEY_RESIZE"
  88 #endif
  89 #ifdef TRACE
  90         ," -t       trace screen updates"
  91         ," -T NUM   specify trace mask"
  92 #endif
  93     };
  94     size_t n;
  95     for (n = 0; n < SIZEOF(msg); n++)
  96         fprintf(stderr, "%s\n", msg[n]);
  97     ExitProgram(EXIT_FAILURE);
  98 }
  99
 100 static int
 101 ch_len(NCURSES_CH_T * src)
 102 {
 103     int result = 0;
 104 #if USE_WIDEC_SUPPORT
 105 #endif
 106
 107 #if USE_WIDEC_SUPPORT
 108     while (getcchar(src++, NULL, NULL, NULL, NULL) > 0)
 109         result++;
 110 #else
 111     while (*src++)
 112         result++;
 113 #endif
 114     return result;
 115 }
 116
 117 /*
 118  * Allocate a string into an array of chtype's.  If UTF-8 mode is
 119  * active, translate the string accordingly.
 120  */
 121 static NCURSES_CH_T *
 122 ch_dup(char *src)
 123 {
 124     unsigned len = strlen(src);
 125     NCURSES_CH_T *dst = typeMalloc(NCURSES_CH_T, len + 1);
 126     unsigned j, k;
 127 #if USE_WIDEC_SUPPORT
 128     wchar_t wstr[CCHARW_MAX + 1];
 129     wchar_t wch;
 130     int l = 0;
 131     mbstate_t state;
 132     size_t rc;
 133     int width;
 134 #endif
 135
 136 #if USE_WIDEC_SUPPORT
 137     memset(&state, 0, sizeof(state));
 138 #endif
 139     for (j = k = 0; j < len; j++) {
 140 #if USE_WIDEC_SUPPORT
 141         rc = mbrtowc(&wch, src + j, len - j, &state);
 142         if (rc == (size_t) -1 || rc == (size_t) -2)
 143             break;
 144         j += rc - 1;
 145         if ((width = wcwidth(wch)) < 0)
 146             break;
 147         if ((width > 0 && l > 0) || l == CCHARW_MAX) {
 148             wstr[l] = L'\0';
 149             l = 0;
 150             if (setcchar(dst + k, wstr, 0, 0, NULL) != OK)
 151                 break;
 152             ++k;
 153         }
 154         if (width == 0 && l == 0)
 155             wstr[l++] = L' ';
 156         wstr[l++] = wch;
 157 #else
 158         dst[k++] = src[j];
 159 #endif
 160     }
 161 #if USE_WIDEC_SUPPORT
 162     if (l > 0) {
 163         wstr[l] = L'\0';
 164         if (setcchar(dst + k, wstr, 0, 0, NULL) == OK)
 165             ++k;
 166     }
 167     setcchar(dst + k, L"", 0, 0, NULL);
 168 #else
 169     dst[k] = 0;
 170 #endif
 171     return dst;
 172 }
 173
 174 int
 175 main(int argc, char *argv[])
 176 {
 177     int MAXLINES = 1000;
 178     FILE *fp;
 179     char buf[BUFSIZ];
 180     int i;
 181     int my_delay = 0;
 182     NCURSES_CH_T **olptr;
 183     int length = 0;
 184     int value = 0;
 185     bool done = FALSE;
 186     bool got_number = FALSE;
 187 #if CAN_RESIZE
 188     bool nonposix_resize = FALSE;
 189 #endif
 190     const char *my_label = "Input";
 191
 192     setlocale(LC_ALL, "");
 193
 194 #ifndef NCURSES_VERSION
 195     /*
 196      * We know ncurses will catch SIGINT if we don't establish our own handler.
 197      * Other versions of curses may/may not catch it.
 198      */
 199     (void) signal(SIGINT, finish);      /* arrange interrupts to terminate */
 200 #endif
 201
 202     while ((i = getopt(argc, argv, "cin:rtT:")) != EOF) {
 203         switch (i) {
 204         case 'c':
 205             try_color = TRUE;
 206             break;
 207         case 'i':
 208             signal(SIGINT, SIG_IGN);
 209             signal(SIGQUIT, SIG_IGN);
 210             signal(SIGTERM, SIG_IGN);
 211             break;
 212         case 'n':
 213             if ((MAXLINES = atoi(optarg)) < 1)
 214                 usage();
 215             break;
 216 #if CAN_RESIZE
 217         case 'r':
 218             nonposix_resize = TRUE;
 219             break;
 220 #endif
 221 #ifdef TRACE
 222         case 'T':
 223             trace(atoi(optarg));
 224             break;
 225         case 't':
 226             trace(TRACE_CALLS);
 227             break;
 228 #endif
 229         default:
 230             usage();
 231         }
 232     }
 233     if (optind + 1 != argc)
 234         usage();
 235
 236     if ((my_lines = typeMalloc(NCURSES_CH_T *, MAXLINES + 2)) == 0)
 237         usage();
 238
 239     fname = argv[optind];
 240     if ((fp = fopen(fname, "r")) == 0) {
 241         perror(fname);
 242         ExitProgram(EXIT_FAILURE);
 243     }
 244 #if CAN_RESIZE
 245     if (nonposix_resize)
 246         (void) signal(SIGWINCH, adjust);        /* arrange interrupts to resize */
 247 #endif
 248
 249     /* slurp the file */
 250     for (lptr = &my_lines[0]; (lptr - my_lines) < MAXLINES; lptr++) {
 251         char temp[BUFSIZ], *s, *d;
 252         int col;
 253
 254         if (fgets(buf, sizeof(buf), fp) == 0)
 255             break;
 256
 257         /* convert tabs so that shift will work properly */
 258         for (s = buf, d = temp, col = 0; (*d = *s) != '\0'; s++) {
 259             if (*d == '\n') {
 260                 *d = '\0';
 261                 break;
 262             } else if (*d == '\t') {
 263                 col = (col | 7) + 1;
 264                 while ((d - temp) != col)
 265                     *d++ = ' ';
 266             } else
 267 #if USE_WIDEC_SUPPORT
 268                 col++, d++;
 269 #else
 270             if (isprint(UChar(*d))) {
 271                 col++;
 272                 d++;
 273             } else {
 274                 sprintf(d, "\\%03o", UChar(*s));
 275                 d += strlen(d);
 276                 col = (d - temp);
 277             }
 278 #endif
 279         }
 280         *lptr = ch_dup(temp);
 281     }
 282     (void) fclose(fp);
 283     length = lptr - my_lines;
 284
 285     (void) initscr();           /* initialize the curses library */
 286     keypad(stdscr, TRUE);       /* enable keyboard mapping */
 287     (void) nonl();              /* tell curses not to do NL->CR/NL on output */
 288     (void) cbreak();            /* take input chars one at a time, no wait for \n */
 289     (void) noecho();            /* don't echo input */
 290     nodelay(stdscr, TRUE);
 291     idlok(stdscr, TRUE);        /* allow use of insert/delete line */
 292
 293     if (try_color) {
 294         if (has_colors()) {
 295             start_color();
 296             init_pair(my_pair, COLOR_WHITE, COLOR_BLUE);
 297             bkgd(COLOR_PAIR(my_pair));
 298         } else {
 299             try_color = FALSE;
 300         }
 301     }
 302
 303     lptr = my_lines;
 304     while (!done) {
 305         int n, c;
 306
 307         if (!got_number)
 308             show_all(my_label);
 309
 310         n = 0;
 311         for (;;) {
 312 #if CAN_RESIZE
 313             if (interrupted) {
 314                 adjust(0);
 315                 my_label = "interrupt";
 316             }
 317 #endif
 318             waiting = TRUE;
 319             c = getch();
 320             waiting = FALSE;
 321             if ((c < 127) && isdigit(c)) {
 322                 if (!got_number) {
 323                     mvprintw(0, 0, "Count: ");
 324                     clrtoeol();
 325                 }
 326                 addch(c);
 327                 value = 10 * value + (c - '0');
 328                 got_number = TRUE;
 329             } else
 330                 break;
 331         }
 332         if (got_number && value) {
 333             n = value;
 334         } else {
 335             n = 1;
 336         }
 337
 338         if (c != ERR)
 339             my_label = keyname(c);
 340         switch (c) {
 341         case KEY_DOWN:
 342         case 'n':
 343             olptr = lptr;
 344             for (i = 0; i < n; i++)
 345                 if ((lptr - my_lines) < (length - LINES + 1))
 346                     lptr++;
 347                 else
 348                     break;
 349             wscrl(stdscr, lptr - olptr);
 350             break;
 351
 352         case KEY_UP:
 353         case 'p':
 354             olptr = lptr;
 355             for (i = 0; i < n; i++)
 356                 if (lptr > my_lines)
 357                     lptr--;
 358                 else
 359                     break;
 360             wscrl(stdscr, lptr - olptr);
 361             break;
 362
 363         case 'h':
 364         case KEY_HOME:
 365             lptr = my_lines;
 366             break;
 367
 368         case 'e':
 369         case KEY_END:
 370             if (length > LINES)
 371                 lptr = my_lines + length - LINES + 1;
 372             else
 373                 lptr = my_lines;
 374             break;
 375
 376         case 'r':
 377         case KEY_RIGHT:
 378             shift += n;
 379             break;
 380
 381         case 'l':
 382         case KEY_LEFT:
 383             shift -= n;
 384             if (shift < 0) {
 385                 shift = 0;
 386                 beep();
 387             }
 388             break;
 389
 390         case 'q':
 391             done = TRUE;
 392             break;
 393
 394 #ifdef KEY_RESIZE
 395         case KEY_RESIZE:        /* ignore this; ncurses will repaint */
 396             break;
 397 #endif
 398         case 's':
 399             if (got_number) {
 400                 halfdelay(my_delay = n);
 401             } else {
 402                 nodelay(stdscr, FALSE);
 403                 my_delay = -1;
 404             }
 405             break;
 406         case ' ':
 407             nodelay(stdscr, TRUE);
 408             my_delay = 0;
 409             break;
 410         case ERR:
 411             if (!my_delay)
 412                 napms(50);
 413             break;
 414         default:
 415             beep();
 416             break;
 417         }
 418         if (c >= KEY_MIN || (c > 0 && !isdigit(c))) {
 419             got_number = FALSE;
 420             value = 0;
 421         }
 422     }
 423
 424     finish(0);                  /* we're done */
 425 }
 426
 427 static RETSIGTYPE
 428 finish(int sig)
 429 {
 430     endwin();
 431     ExitProgram(sig != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
 432 }
 433
 434 #if CAN_RESIZE
 435 /*
 436  * This uses functions that are "unsafe", but it seems to work on SunOS and
 437  * Linux.  Usually:  the "unsafe" refers to the functions that POSIX lists
 438  * which may be called from a signal handler.  Those do not include buffered
 439  * I/O, which is used for instance in wrefresh().  To be really portable, you
 440  * should use the KEY_RESIZE return (which relies on ncurses' sigwinch
 441  * handler).
 442  *
 443  * The 'wrefresh(curscr)' is needed to force the refresh to start from the top
 444  * of the screen -- some xterms mangle the bitmap while resizing.
 445  */
 446 static RETSIGTYPE
 447 adjust(int sig)
 448 {
 449     if (waiting || sig == 0) {
 450         struct winsize size;
 451
 452         if (ioctl(fileno(stdout), TIOCGWINSZ, &size) == 0) {
 453             resize_term(size.ws_row, size.ws_col);
 454             wrefresh(curscr);   /* Linux needs this */
 455             show_all(sig ? "SIGWINCH" : "interrupt");
 456         }
 457         interrupted = FALSE;
 458     } else {
 459         interrupted = TRUE;
 460     }
 461     (void) signal(SIGWINCH, adjust);    /* some systems need this */
 462 }
 463 #endif /* CAN_RESIZE */
 464
 465 static void
 466 show_all(const char *tag)
 467 {
 468     int i;
 469     char temp[BUFSIZ];
 470     NCURSES_CH_T *s;
 471     time_t this_time;
 472
 473 #if CAN_RESIZE
 474     sprintf(temp, "%s (%3dx%3d) col %d ", tag, LINES, COLS, shift);
 475     i = strlen(temp);
 476     sprintf(temp + i, "view %.*s", (int) (sizeof(temp) - 7 - i), fname);
 477 #else
 478     sprintf(temp, "view %.*s", (int) sizeof(temp) - 7, fname);
 479 #endif
 480     move(0, 0);
 481     printw("%.*s", COLS, temp);
 482     clrtoeol();
 483     this_time = time((time_t *) 0);
 484     strcpy(temp, ctime(&this_time));
 485     if ((i = strlen(temp)) != 0) {
 486         temp[--i] = 0;
 487         if (move(0, COLS - i - 2) != ERR)
 488             printw("  %s", temp);
 489     }
 490
 491     scrollok(stdscr, FALSE);    /* prevent screen from moving */
 492     for (i = 1; i < LINES; i++) {
 493         move(i, 0);
 494         printw("%3ld:", (long) (lptr + i - my_lines));
 495         clrtoeol();
 496         if ((s = lptr[i - 1]) != 0) {
 497             int len = ch_len(s);
 498             if (len > shift) {
 499 #if USE_WIDEC_SUPPORT
 500                 add_wchstr(s + shift);
 501 #else
 502                 addchstr(s + shift);
 503 #endif
 504             }
 505 #if defined(NCURSES_VERSION) || defined(HAVE_WCHGAT)
 506             if (try_color)
 507                 wchgat(stdscr, -1, A_NORMAL, my_pair, NULL);
 508 #endif
 509         }
 510     }
 511     setscrreg(1, LINES - 1);
 512     scrollok(stdscr, TRUE);
 513     refresh();
 514 }