games/grdc/grdc.c

   1 /*
   2  * Grand digital clock for curses compatible terminals
   3  * Usage: grdc [-s] [-d msecs] [n]   -- run for n seconds (default infinity)
   4  * Flags:       -s: scroll (default scroll duration 120msec)
   5  *      -d msecs: specify scroll duration (implies -s)
   6  *
   7  * modified 10-18-89 for curses (jrl)
   8  * 10-18-89 added signal handling
   9  * 03-23-04 added centering, scroll delay (cap)
  10  *
  11  * $FreeBSD: src/games/grdc/grdc.c,v 1.8.2.1 2001/10/02 11:51:49 ru Exp $
  12  * $DragonFly: src/games/grdc/grdc.c,v 1.6 2007/04/18 18:32:12 swildner Exp $
  13  */
  14
  15 #include <err.h>
  16 #include <time.h>
  17 #include <signal.h>
  18 #include <ncurses.h>
  19 #include <stdlib.h>
  20 #ifndef NONPOSIX
  21 #include <unistd.h>
  22 #endif
  23 #include <time.h>
  24
  25 #define XLENGTH 58
  26 #define YDEPTH  7
  27
  28 time_t now;
  29 struct tm *tm;
  30
  31 short disp[11] = {
  32         075557, 011111, 071747, 071717, 055711,
  33         074717, 074757, 071111, 075757, 075717, 002020
  34 };
  35 long old[6], next[6], new[6], mask;
  36
  37 volatile sig_atomic_t sigtermed;
  38
  39 int hascolor = 0;
  40 long int scroll_msecs = 120;
  41 int xbase, ybase, xmax, ymax;
  42
  43 static void set(int, int);
  44 static void standt(int);
  45 static void sighndl(int);
  46 static void usage(void);
  47 static void draw_row(int, int);
  48 static void snooze(long int);
  49
  50 void
  51 sighndl(int signo)
  52 {
  53         sigtermed = signo;
  54 }
  55
  56 int
  57 main(int argc, char **argv)
  58 {
  59         int i, s, k;
  60         int n = 0;
  61         int ch;
  62         int scrol;
  63         int forever = 1;
  64
  65         scrol = 0;
  66
  67         while ((ch = getopt(argc, argv, "d:s")) != -1)
  68                 switch (ch) {
  69                 case 'd':
  70                         scroll_msecs = atol(optarg);
  71                         if (scroll_msecs < 0)
  72                                 errx(1, "scroll duration may not be negative");
  73                         /* FALLTHROUGH */
  74                 case 's':
  75                         scrol = 1;
  76                         break;
  77                 case '?':
  78                 default:
  79                         usage();
  80                         /* NOTREACHED */
  81                 }
  82         argc -= optind;
  83         argv += optind;
  84
  85         if (argc > 1) {
  86                 usage();
  87                 /* NOTREACHED */
  88         }
  89
  90         if (argc > 0) {
  91                 n = atoi(*argv);
  92                 forever = 0;
  93         }
  94
  95         initscr();
  96
  97         getmaxyx(stdscr, ymax, xmax);
  98         if (ymax < YDEPTH + 2 || xmax < XLENGTH + 4) {
  99                 endwin();
 100                 errx(1, "terminal too small");
 101         }
 102         xbase = (xmax - XLENGTH) / 2 + 2;
 103         ybase = (ymax - YDEPTH) / 2 + 1;
 104
 105         signal(SIGINT, sighndl);
 106         signal(SIGTERM, sighndl);
 107         signal(SIGHUP, sighndl);
 108
 109         cbreak();
 110         noecho();
 111         curs_set(0);
 112
 113         hascolor = has_colors();
 114
 115         if (hascolor) {
 116                 start_color();
 117                 init_pair(1, COLOR_BLACK, COLOR_RED);
 118                 init_pair(2, COLOR_RED, COLOR_BLACK);
 119                 init_pair(3, COLOR_WHITE, COLOR_BLACK);
 120                 attrset(COLOR_PAIR(2));
 121         }
 122
 123         clear();
 124         refresh();
 125
 126         if (hascolor) {
 127                 attrset(COLOR_PAIR(3));
 128
 129                 mvaddch(ybase - 2, xbase - 3, ACS_ULCORNER);
 130                 hline(ACS_HLINE, XLENGTH);
 131                 mvaddch(ybase - 2, xbase - 2 + XLENGTH, ACS_URCORNER);
 132
 133                 mvaddch(ybase + YDEPTH - 1, xbase - 3, ACS_LLCORNER);
 134                 hline(ACS_HLINE, XLENGTH);
 135                 mvaddch(ybase + YDEPTH - 1, xbase - 2 + XLENGTH, ACS_LRCORNER);
 136
 137                 move(ybase - 1, xbase - 3);
 138                 vline(ACS_VLINE, YDEPTH);
 139
 140                 move(ybase - 1, xbase - 2 + XLENGTH);
 141                 vline(ACS_VLINE, YDEPTH);
 142
 143                 attrset(COLOR_PAIR(2));
 144                 refresh();
 145         }
 146         do {
 147                 mask = 0;
 148                 time(&now);
 149                 tm = localtime(&now);
 150                 set(tm->tm_sec % 10, 0);
 151                 set(tm->tm_sec / 10, 4);
 152                 set(tm->tm_min % 10, 10);
 153                 set(tm->tm_min / 10, 14);
 154                 set(tm->tm_hour % 10, 20);
 155                 set(tm->tm_hour / 10, 24);
 156                 set(10, 7);
 157                 set(10, 17);
 158                 for(k = 0; k < 6; k++) {
 159                         if (scrol) {
 160                                 snooze(scroll_msecs / 6);
 161                                 for(i = 0; i < 5; i++)
 162                                         new[i] = (new[i] & ~mask) |
 163                                                  (new[i+1] & mask);
 164                                 new[5] = (new[5] & ~mask) | (next[k] & mask);
 165                         } else
 166                                 new[k] = (new[k] & ~mask) | (next[k] & mask);
 167                         next[k] = 0;
 168                         for (s = 1; s >= 0; s--) {
 169                                 standt(s);
 170                                 for (i = 0; i < 6; i++) {
 171                                         draw_row(i, s);
 172                                 }
 173                                 if (!s) {
 174                                         move(ybase, 0);
 175                                         refresh();
 176                                 }
 177                         }
 178                 }
 179                 move(ybase, 0);
 180                 refresh();
 181                 snooze(1000 - (scrol ? scroll_msecs : 0));
 182         } while (forever ? 1 : --n);
 183         standend();
 184         clear();
 185         refresh();
 186         endwin();
 187         return(0);
 188 }
 189
 190 void
 191 snooze(long int msecs)
 192 {
 193         struct timespec ts;
 194
 195         ts.tv_sec = 0;
 196         ts.tv_nsec = 1000000 * msecs;
 197
 198         nanosleep(&ts, NULL);
 199
 200         if (sigtermed) {
 201                 standend();
 202                 clear();
 203                 refresh();
 204                 endwin();
 205                 errx(1, "terminated by signal %d", (int)sigtermed);
 206         }
 207 }
 208
 209 void
 210 draw_row(int i, int s)
 211 {
 212         long a, t;
 213         int j;
 214
 215         if ((a = (new[i] ^ old[i]) & (s ? new : old)[i]) != 0) {
 216                 for (j = 0, t = 1 << 26; t; t >>= 1, j++) {
 217                         if (a & t) {
 218                                 if (!(a & (t << 1))) {
 219                                         move(ybase + i, xbase + 2 * j);
 220                                 }
 221                                 addstr("  ");
 222                         }
 223                 }
 224         }
 225         if (!s) {
 226                 old[i] = new[i];
 227         }
 228 }
 229
 230 void
 231 set(int t, int n)
 232 {
 233         int i, m;
 234
 235         m = 7 << n;
 236         for (i = 0; i < 5; i++) {
 237                 next[i] |= ((disp[t] >> (4 - i) * 3) & 07) << n;
 238                 mask |= (next[i] ^ old[i]) & m;
 239         }
 240         if (mask & m)
 241                 mask |= m;
 242 }
 243
 244 void
 245 standt(int on)
 246 {
 247         if (on) {
 248                 if (hascolor) {
 249                         attron(COLOR_PAIR(1));
 250                 } else {
 251                         attron(A_STANDOUT);
 252                 }
 253         } else {
 254                 if (hascolor) {
 255                         attron(COLOR_PAIR(2));
 256                 } else {
 257                         attroff(A_STANDOUT);
 258                 }
 259         }
 260 }
 261
 262 void
 263 usage(void)
 264 {
 265         fprintf(stderr, "usage: grdc [-s] [-d msecs] [n]\n");
 266         exit(1);
 267 }