mdw@git.distorted.org.uk Git - sgt/puzzles/blob - misc.c

   1 /*
   2  * misc.c: Miscellaneous helpful functions.
   3  */
   4
   5 #include <assert.h>
   6 #include <stdlib.h>
   7
   8 #include "puzzles.h"
   9
  10 int rand_upto(int limit)
  11 {
  12     unsigned long divisor = RAND_MAX / (unsigned)limit;
  13     unsigned long max = divisor * (unsigned)limit;
  14     unsigned long n;
  15
  16     assert(limit > 0);
  17
  18     do {
  19         n = rand();
  20     } while (n >= max);
  21
  22     n /= divisor;
  23
  24     return (int)n;
  25 }
  26
  27 void free_cfg(config_item *cfg)
  28 {
  29     config_item *i;
  30
  31     for (i = cfg; i->type != C_END; i++)
  32         if (i->type == C_STRING)
  33             sfree(i->sval);
  34     sfree(cfg);
  35 }