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Annotation of 43BSD/contrib/icon/rt/numcmp.c, revision 1.1

1.1     ! root        1: #include "../h/rt.h"
        !             2: 
        !             3: /*
        !             4:  * numcmp - compare two numbers.  Returns -1, 0, 1 for arg1 <, =, > arg2.
        !             5:  *  arg0 is made into a descriptor for the return value.
        !             6:  */
        !             7: 
        !             8: numcmp(arg1, arg2, arg0)
        !             9: struct descrip *arg1, *arg2, *arg0;
        !            10:    {
        !            11:    register int result;
        !            12:    union numeric n1, n2;
        !            13:    int t1, t2;
        !            14:    /*
        !            15:     * Be sure that both arg1 and arg2 are numeric.
        !            16:     */
        !            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:     *  arg1 and arg2 are both integers, compare them and
        !            26:     *  create an integer descriptor in arg0
        !            27:     */
        !            28: 
        !            29:           result = 0;
        !            30:           if (n1.integer < n2.integer) result = -1;
        !            31:           else if (n1.integer != n2.integer) result = 1;
        !            32:       mkint(n2.integer, arg0);
        !            33:       }
        !            34:    else {
        !            35: 
        !            36:    /*
        !            37:     *  Either arg1 or arg2 is real. Convert the other to a real,
        !            38:     *  compare them and create a real descriptor in arg0.
        !            39:     */
        !            40: 
        !            41:       if (t1 == T_LONGINT)
        !            42:          n1.real = n1.integer;
        !            43:       if (t2 == T_LONGINT)
        !            44:          n2.real = n2.integer;
        !            45:           result = 0;
        !            46:           if (n1.real < n2.real) result = -1;
        !            47:           else if (n1.real != n2.real) result = 1;
        !            48:       mkreal(n2.real, arg0);
        !            49:       }
        !            50: 
        !            51:    return (result);             /* return result in r0 */
        !            52:    }
        !            53: 

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