4.3BSD - /usr/src/new/icon/operators/mod.c

   1: #include "../h/rt.h"
   2: 
   3: /*
   4:  * x % y - take remainder of x / y.
   5:  */
   6: 
   7: mod(nargs, arg2, arg1, arg0)
   8: int nargs;
   9: struct descrip arg2, arg1, arg0;
  10:    {
  11:    register int t1, t2;
  12:    union numeric n1, n2;
  13: 
  14:    SetBound;
  15:    /*
  16:     * x and y must be numeric.  Save the cvnum return values for later use.
  17:     */
  18:    if ((t1 = cvnum(&arg1, &n1)) == NULL)
  19:       runerr(102, &arg1);
  20:    if ((t2 = cvnum(&arg2, &n2)) == NULL)
  21:       runerr(102, &arg2);
  22: 
  23:    if (t1 == T_LONGINT && t2 == T_LONGINT) {
  24:       /*
  25:        * Both x and y are integers.  If y is 0, generate an error because
  26:        *  it's divide by 0.  Otherwise, just return the modulus of the
  27:        *  two arguments.
  28:        */
  29:       if (n2.integer == 0L)
  30:          runerr(202, &arg2);
  31:       mkint(n1.integer % n2.integer, &arg0);
  32:       }
  33:    else {
  34:       /*
  35:        * Either x or y is real, convert the other to a real, perform
  36:        *  the modulation, convert the result to an integer and place it
  37:        *  in arg0 as the return value.
  38:        */
  39:       if (t1 == T_LONGINT)
  40:          n1.real = n1.integer;
  41:       if (t2 == T_LONGINT)
  42:          n2.real = n2.integer;
  43:       mkreal(n1.real - n2.real * (int)(n1.real / n2.real), &arg0);
  44:       }
  45:    ClearBound;
  46:    }
  47: 
  48: Opblock(mod,2,"%")

Defined functions