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

1.1       root        1: #include "../h/rt.h"
                      2: #ifdef XPX
                      3: /*
                      4:  * seq(e1,e2)  - generate e1, e1+e2, e1+e2+e2, ... .
                      5:  */
                      6: 
                      7: Xseq(nargs, arg2, arg1, arg0)
                      8: int nargs;
                      9: struct descrip arg2, arg1, arg0;
                     10:    {
                     11:    long from, by;
                     12: 
                     13:    /*
                     14:     * Default e1 and e2 to 1.
                     15:     */
                     16:    defint(&arg1, &from, 1);
                     17:    defint(&arg2, &by, 1);
                     18:    
                     19:    /*
                     20:     * Produce error if e2 is 0, i.e., infinite sequence of e1's.
                     21:     */
                     22:    if (by == 0)
                     23:       runerr(211, &arg2);
                     24: 
                     25:    /*
                     26:     * Suspend sequence, stopping when largest or smallest integer
                     27:     *  is reached.
                     28:     */
                     29:    while ((from <= MAXLONG && by > 0) || (from >= MINLONG && by < 0)) {
                     30:       mkint(from, &arg0);
                     31:       suspend();
                     32:       from += by;
                     33:       }
                     34:    fail();
                     35:    }
                     36: 
                     37: Procblock(seq,2)
                     38: 
                     39: #else XPX
                     40: char junk;                     /* prevent null object file */
                     41: #endif XPX

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