eccparams.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3
   4 int
   5 main (int argc, char **argv)
   6 {
   7   unsigned bits;
   8   unsigned max;
   9   unsigned c;
  10   if (argc < 3)
  11     {
  12     usage:
  13       fprintf(stderr, "Usage: %s: exp-bits max-entries\n", argv[0]);
  14       return EXIT_FAILURE;
  15     }
  16   bits = atoi(argv[1]);
  17   if (bits < 2)
  18     goto usage;
  19   max = atoi(argv[2]);
  20   if ( max < 2)
  21     goto usage;
  22
  23   for (c = 3; (1<<c) <= max; c++)
  24     {
  25       unsigned b;
  26       for (b = 1;; b++)
  27         {
  28           unsigned s = (1<<c) * b;
  29           unsigned k;
  30           if (s > max)
  31             break;
  32           k = (bits + (c*b) - 1) / (c * b);
  33           printf("k = %2u, c = %2u, S = %3u, T = %3u (%3u A + %2u D)\n",
  34                  k, c, s, (b+1)*k, b*k, k);
  35         }
  36     }
  37   return 0;
  38 }