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Annotation of 43BSD/contrib/icon/functions/abs.c, revision 1.1.1.1

1.1       root        1: #include "../h/rt.h"
                      2: 
                      3: /*
                      4:  * abs(x) - absolute value of x.
                      5:  */
                      6: Xabs(nargs, arg1, arg0)
                      7: int nargs;
                      8: struct descrip arg1, arg0;
                      9:    {
                     10:    union numeric result;
                     11: 
                     12:    switch (cvnum(&arg1, &result)) {
                     13:       /*
                     14:        * If x is convertible to a numeric, turn arg0 into
                     15:        *  a descriptor for the appropriate type and value.  If the
                     16:        *  conversion fails, produce an error.  This code assumes that
                     17:        *  x = -x is always valid, but this assumption does not always
                     18:        *  hold.
                     19:        */
                     20:       case T_LONGINT:
                     21:          if (result.integer < 0L)
                     22:             result.integer = -result.integer;
                     23:          mkint(result.integer, &arg0);
                     24:          break;
                     25: 
                     26:       case T_REAL:
                     27:          if (result.real < 0.0)
                     28:             result.real = -result.real;
                     29:          mkreal(result.real, &arg0);
                     30:          break;
                     31: 
                     32:       default:
                     33:          runerr(102, &arg1);
                     34:       }
                     35:    }
                     36: 
                     37: Procblock(abs,1)

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