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

1.1       root        1: #include "../h/rt.h"
                      2: #ifdef SETS
                      3: /*
                      4:  * delete(S,x) - delete element x from set S if it is there
                      5:  *  (always succeeds and returns S).
                      6:  */
                      7: 
                      8: Xdelete(nargs,arg2,arg1,arg0)
                      9: int nargs;
                     10: struct descrip arg0, arg1, arg2;
                     11:    {
                     12:    register struct descrip *pd;
                     13:    int res ;
                     14:    extern struct descrip *memb();
                     15: 
                     16:    DeRef(arg1)
                     17:    DeRef(arg2)
                     18:    arg0 = arg1;
                     19: 
                     20:    if (QUAL(arg1) || TYPE(arg1) != T_SET)
                     21:        runerr(119,&arg1);
                     22:       /*
                     23:       * The technique and philosophy here are the same
                     24:       *  as used in insert.c - see comment there.
                     25:       */
                     26:    pd = memb(BLKLOC(arg1),&arg2,hash(&arg2),&res);
                     27:    if (res == 1) {
                     28:       /*
                     29:       * The element is there so delete it.
                     30:       */
                     31:       *pd = BLKLOC(*pd)->selem.sblink;
                     32:       (BLKLOC(arg1)->set.setsize)--;
                     33:       }
                     34:    }
                     35: 
                     36: Procblock(delete,2)
                     37: 
                     38: #else SETS
                     39: char junk;                     /* prevent null object file  */
                     40: #endif SETS

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