4.3BSD - /usr/src/new/icon/functions/member.c

   1: #include "../h/rt.h"
   2: #ifdef SETS
   3: 
   4: /*
   5:  * member(S,x) - returns x if x is a member of set S otherwise fails.
   6:  */
   7: 
   8: Xmember(nargs,arg2,arg1,arg0)
   9: int nargs;
  10: struct descrip arg2, arg1, arg0;
  11:    {
  12:    int res;
  13:    extern struct descrip *memb();
  14: 
  15:    DeRef(arg1)
  16:    DeRef(arg2)
  17:    if (QUAL(arg1) || TYPE(arg1) != T_SET)
  18:       runerr(119,&arg1);    /* S is not a set  */
  19:    /* If arg2 is a member of set arg1 then "res" will have the
  20:     * value 1 otherwise it will have the value 0.
  21:     */
  22:    memb(BLKLOC(arg1),&arg2,hash(&arg2),&res);
  23:    if (res == 1) {      /* It is a member. */
  24:       arg0 = arg2;      /* Return the member if it is in arg1. */
  25:       return;
  26:       }
  27:    fail();
  28:    }
  29: 
  30: Procblock(member,2)
  31: 
  32: #else SETS
  33: char junk;          /* prevent null object file */
  34: #endif SETS

Defined functions