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Annotation of 43BSD/contrib/icon/operators/plus.c, revision 1.1.1.1

1.1       root        1: #include "../h/rt.h"
                      2: 
                      3: /*
                      4:  * x + y - add x and y.
                      5:  */
                      6: 
                      7: plus(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:    extern long ckadd();
                     14: 
                     15:    SetBound;
                     16:    /*
                     17:     * x and y must be numeric.  Save the cvnum return values for later use.
                     18:     */
                     19:    if ((t1 = cvnum(&arg1, &n1)) == NULL)
                     20:       runerr(102, &arg1);
                     21:    if ((t2 = cvnum(&arg2, &n2)) == NULL)
                     22:       runerr(102, &arg2);
                     23: 
                     24:    if (t1 == T_LONGINT && t2 == T_LONGINT)
                     25:       /*
                     26:        * Both x and y are integers.  Perform integer addition using
                     27:        *  ckadd (to check for overflow) and place the result in arg0 as
                     28:        *  the return value.
                     29:        */
                     30:       mkint(ckadd(n1.integer, n2.integer), &arg0);
                     31:    else {
                     32:       /*
                     33:        * Either x or y is real, convert the other to a real, perform
                     34:        *  the addition and place the result in arg0 as the return value.
                     35:        */
                     36:       if (t1 == T_LONGINT)
                     37:          n1.real = n1.integer;
                     38:       if (t2 == T_LONGINT)
                     39:          n2.real = n2.integer;
                     40:       mkreal(n1.real + n2.real, &arg0);
                     41:       }
                     42:    ClearBound;
                     43:    }
                     44: 
                     45: Opblock(plus,2,"+")

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