libio/dbz/random.c

   1 /*
   2  * random-number generator for testing
   3  */
   4 static unsigned long next = 1;
   5
   6 /*
   7  - range - generate a random number within an inclusive range
   8  *
   9  * Algorithm from ANSI C standard.  Limitation:  max-min <= 32767.
  10  */
  11 int
  12 range(min, max)
  13 int min;
  14 int max;
  15 {
  16         register int temp;
  17
  18         next = next * 1103515245 + 12345;
  19         temp = (int)((next/65536)%32768);
  20         return(temp%(max - min + 1) + min);
  21 }
  22
  23 /*
  24  - seed - seed random number generator
  25  */
  26 void
  27 seed(n)
  28 long n;
  29 {
  30         next = (unsigned long)n;
  31 }