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