/[cvs]/stack/stack.c
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Diff of /stack/stack.c

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revision 1.39 by teddy, Wed Feb 6 11:39:20 2002 UTC revision 1.40 by teddy, Wed Feb 6 11:44:02 2002 UTC
# Line 454  extern void eval(environment *env) Line 454  extern void eval(environment *env)
454    }    }
455  }  }
456    
457    /* Reverse a list */
458    extern void rev(environment *env){
459      stackitem *old_head, *new_head, *item;
460    
461      if((env->head)==NULL) {
462        printerr("Too Few Arguments");
463        env->err=1;
464        return;
465      }
466    
467      if(env->head->item->type!=list) {
468        printerr("Bad Argument Type");
469        env->err=2;
470        return;
471      }
472    
473      old_head=(stackitem *)(env->head->item->content.ptr);
474      new_head=NULL;
475      while(old_head != NULL){
476        item=old_head;
477        old_head=old_head->next;
478        item->next=new_head;
479        new_head=item;
480      }
481      env->head->item->content.ptr=new_head;
482    }
483    
484  /* Make a list. */  /* Make a list. */
485  extern void pack(environment *env)  extern void pack(environment *env)
486  {  {
# Line 494  extern void pack(environment *env) Line 521  extern void pack(environment *env)
521    temp->item= pack;    temp->item= pack;
522    
523    push(&(env->head), temp);    push(&(env->head), temp);
524      rev(env);
525  }  }
526    
527  /* Parse input. */  /* Parse input. */
# Line 603  extern void expand(environment *env) Line 631  extern void expand(environment *env)
631    
632  }  }
633    
 /* Reverse a list */  
 extern void rev(environment *env){  
   stackitem *old_head, *new_head, *item;  
   
   if((env->head)==NULL) {  
     printerr("Too Few Arguments");  
     env->err=1;  
     return;  
   }  
   
   if(env->head->item->type!=list) {  
     printerr("Bad Argument Type");  
     env->err=2;  
     return;  
   }  
   
   old_head=(stackitem *)(env->head->item->content.ptr);  
   new_head=NULL;  
   while(old_head != NULL){  
     item=old_head;  
     old_head=old_head->next;  
     item->next=new_head;  
     new_head=item;  
   }  
   env->head->item->content.ptr=new_head;  
 }  
   
634  /* Compares two elements by reference. */  /* Compares two elements by reference. */
635  extern void eq(environment *env)  extern void eq(environment *env)
636  {  {
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