usr.bin/grdc/grdc.c

   1 /*
   2  * Grand digital clock for curses compatible terminals
   3  * Usage: grdc [-st] [n]   -- run for n seconds (default infinity)
   4  * Flags: -s: scroll
   5  *        -t: output time in 12-hour format
   6  *
   7  *
   8  * modified 10-18-89 for curses (jrl)
   9  * 10-18-89 added signal handling
  10  *
  11  * modified 03-25-03 for 12 hour option
  12  *     - Samy Al Bahra <samy@kerneled.com>
  13  */
  14
  15 #include <err.h>
  16 #include <ncurses.h>
  17 #include <signal.h>
  18 #include <stdlib.h>
  19 #include <time.h>
  20 #include <unistd.h>
  21
  22 #define YBASE   10
  23 #define XBASE   10
  24 #define XLENGTH 58
  25 #define YDEPTH  7
  26
  27 static struct timespec now;
  28 static struct tm *tm;
  29
  30 static short disp[11] = {
  31         075557, 011111, 071747, 071717, 055711,
  32         074717, 074757, 071111, 075757, 075717, 002020
  33 };
  34 static long old[6], next[6], new[6], mask;
  35
  36 static volatile sig_atomic_t sigtermed;
  37
  38 static int hascolor = 0;
  39
  40 static void set(int, int);
  41 static void standt(int);
  42 static void movto(int, int);
  43 static void sighndl(int);
  44 static void usage(void) __dead2;
  45
  46 static void
  47 sighndl(int signo)
  48 {
  49
  50         sigtermed = signo;
  51 }
  52
  53 int
  54 main(int argc, char *argv[])
  55 {
  56         struct timespec delay;
  57         time_t prev_sec;
  58         long t, a;
  59         int i, j, s, k;
  60         int n;
  61         int ch;
  62         int scrol;
  63         int t12;
  64
  65         t12 = scrol = 0;
  66
  67         while ((ch = getopt(argc, argv, "ts")) != -1)
  68         switch (ch) {
  69         case 's':
  70                 scrol = 1;
  71                 break;
  72         case 't':
  73                 t12 = 1;
  74                 break;
  75         case '?':
  76         default:
  77                 usage();
  78                 /* NOTREACHED */
  79         }
  80         argc -= optind;
  81         argv += optind;
  82
  83         if (argc > 1) {
  84                 usage();
  85                 /* NOTREACHED */
  86         }
  87
  88         if (argc > 0) {
  89                 n = atoi(*argv) + 1;
  90                 if (n < 1) {
  91                         warnx("number of seconds is out of range");
  92                         usage();
  93                         /* NOTREACHED */
  94                 }
  95         } else
  96                 n = 0;
  97
  98         initscr();
  99
 100         signal(SIGINT,sighndl);
 101         signal(SIGTERM,sighndl);
 102         signal(SIGHUP,sighndl);
 103
 104         cbreak();
 105         noecho();
 106         curs_set(0);
 107
 108         hascolor = has_colors();
 109
 110         if(hascolor) {
 111                 start_color();
 112                 init_pair(1, COLOR_BLACK, COLOR_RED);
 113                 init_pair(2, COLOR_RED, COLOR_BLACK);
 114                 init_pair(3, COLOR_WHITE, COLOR_BLACK);
 115                 attrset(COLOR_PAIR(2));
 116         }
 117
 118         clear();
 119         refresh();
 120
 121         if(hascolor) {
 122                 attrset(COLOR_PAIR(3));
 123
 124                 mvaddch(YBASE - 2,  XBASE - 3, ACS_ULCORNER);
 125                 hline(ACS_HLINE, XLENGTH);
 126                 mvaddch(YBASE - 2,  XBASE - 2 + XLENGTH, ACS_URCORNER);
 127
 128                 mvaddch(YBASE + YDEPTH - 1,  XBASE - 3, ACS_LLCORNER);
 129                 hline(ACS_HLINE, XLENGTH);
 130                 mvaddch(YBASE + YDEPTH - 1,  XBASE - 2 + XLENGTH, ACS_LRCORNER);
 131
 132                 move(YBASE - 1,  XBASE - 3);
 133                 vline(ACS_VLINE, YDEPTH);
 134
 135                 move(YBASE - 1,  XBASE - 2 + XLENGTH);
 136                 vline(ACS_VLINE, YDEPTH);
 137
 138                 attrset(COLOR_PAIR(2));
 139         }
 140         clock_gettime(CLOCK_REALTIME_FAST, &now);
 141         prev_sec = now.tv_sec;
 142         do {
 143                 mask = 0;
 144                 tm = localtime(&now.tv_sec);
 145                 set(tm->tm_sec%10, 0);
 146                 set(tm->tm_sec/10, 4);
 147                 set(tm->tm_min%10, 10);
 148                 set(tm->tm_min/10, 14);
 149
 150                 if (t12) {
 151                         if (tm->tm_hour < 12) {
 152                                 if (tm->tm_hour == 0)
 153                                         tm->tm_hour = 12;
 154                                 mvaddstr(YBASE + 5, XBASE + 52, "AM");
 155                         } else {
 156                                 if (tm->tm_hour > 12)
 157                                         tm->tm_hour -= 12;
 158                                 mvaddstr(YBASE + 5, XBASE + 52, "PM");
 159                         }
 160                 }
 161
 162                 set(tm->tm_hour%10, 20);
 163                 set(tm->tm_hour/10, 24);
 164                 set(10, 7);
 165                 set(10, 17);
 166                 for(k=0; k<6; k++) {
 167                         if(scrol) {
 168                                 for(i=0; i<5; i++)
 169                                         new[i] = (new[i]&~mask) | (new[i+1]&mask);
 170                                 new[5] = (new[5]&~mask) | (next[k]&mask);
 171                         } else
 172                                 new[k] = (new[k]&~mask) | (next[k]&mask);
 173                         next[k] = 0;
 174                         for(s=1; s>=0; s--) {
 175                                 standt(s);
 176                                 for(i=0; i<6; i++) {
 177                                         if((a = (new[i]^old[i])&(s ? new : old)[i]) != 0) {
 178                                                 for(j=0,t=1<<26; t; t>>=1,j++) {
 179                                                         if(a&t) {
 180                                                                 if(!(a&(t<<1))) {
 181                                                                         movto(YBASE + i, XBASE + 2*j);
 182                                                                 }
 183                                                                 addstr("  ");
 184                                                         }
 185                                                 }
 186                                         }
 187                                         if(!s) {
 188                                                 old[i] = new[i];
 189                                         }
 190                                 }
 191                                 if(!s) {
 192                                         refresh();
 193                                 }
 194                         }
 195                 }
 196                 movto(6, 0);
 197                 refresh();
 198                 clock_gettime(CLOCK_REALTIME_FAST, &now);
 199                 if (now.tv_sec == prev_sec) {
 200                         if (delay.tv_nsec > 0) {
 201                                 delay.tv_sec = 0;
 202                                 delay.tv_nsec = 1000000000 - now.tv_nsec;
 203                         } else {
 204                                 delay.tv_sec = 1;
 205                                 delay.tv_nsec = 0;
 206                         }
 207                         nanosleep(&delay, NULL);
 208                         clock_gettime(CLOCK_REALTIME_FAST, &now);
 209                 }
 210                 n -= now.tv_sec - prev_sec;
 211                 prev_sec = now.tv_sec;
 212                 if (sigtermed) {
 213                         standend();
 214                         clear();
 215                         refresh();
 216                         endwin();
 217                         errx(1, "terminated by signal %d", (int)sigtermed);
 218                 }
 219         } while (n);
 220         standend();
 221         clear();
 222         refresh();
 223         endwin();
 224         return(0);
 225 }
 226
 227 static void
 228 set(int t, int n)
 229 {
 230         int i, m;
 231
 232         m = 7<<n;
 233         for(i=0; i<5; i++) {
 234                 next[i] |= ((disp[t]>>(4-i)*3)&07)<<n;
 235                 mask |= (next[i]^old[i])&m;
 236         }
 237         if(mask&m)
 238                 mask |= m;
 239 }
 240
 241 static void
 242 standt(int on)
 243 {
 244         if (on) {
 245                 if(hascolor) {
 246                         attron(COLOR_PAIR(1));
 247                 } else {
 248                         attron(A_STANDOUT);
 249                 }
 250         } else {
 251                 if(hascolor) {
 252                         attron(COLOR_PAIR(2));
 253                 } else {
 254                         attroff(A_STANDOUT);
 255                 }
 256         }
 257 }
 258
 259 static void
 260 movto(int line, int col)
 261 {
 262         move(line, col);
 263 }
 264
 265 static void
 266 usage(void)
 267 {
 268
 269         (void)fprintf(stderr, "usage: grdc [-st] [n]\n");
 270         exit(1);
 271 }