Return to seq.c CVS log

Up to [CSRG BSD Unix] / 43BSD / contrib / icon / functions

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

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.