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

1.1       root        1: #include "../h/rt.h"
                      2: 
                      3: /*
                      4:  * e1 to e2 by e3 - generate successive values.
                      5:  */
                      6: 
                      7: toby(nargs, arg3, arg2, arg1, arg0)
                      8: int nargs;
                      9: struct descrip arg3, arg2, arg1, arg0;
                     10:    {
                     11:    DclSave
                     12:    long from, to, by;
                     13: 
                     14:    SetBound;
                     15:    /*
                     16:     * e1 (from), e2 (to), and e3 (by) must be integers.  Also, e3 must
                     17:     *  not be zero.
                     18:     */
                     19:    if (cvint(&arg1, &from) == NULL)
                     20:       runerr(101, &arg1);
                     21:    if (cvint(&arg2, &to) == NULL)
                     22:       runerr(101, &arg2);
                     23:    if (cvint(&arg3, &by) == NULL)
                     24:       runerr(101, &arg3);
                     25:    if (by == 0)
                     26:       runerr(211, &arg3);
                     27: 
                     28:    /*
                     29:     * Count up or down (depending on relationship of from and to) and
                     30:     *  suspend each value in sequence, failing when the limit has been
                     31:     *  exceeded.
                     32:     */
                     33:    while ((from <= to && by > 0) || (from >= to && by < 0)) {
                     34:       mkint(from, &arg0);
                     35:       suspend();
                     36:       from += by;
                     37:       }
                     38:    fail();
                     39:    }
                     40: 
                     41: Opblock(toby,3,"toby")

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