// Binary_Search.cpp,v 1.5 2003/11/01 11:15:22 dhinton Exp

#include "Options.h"
#include "Binary_Search.h"
#include "ace/Log_Msg.h"
#include "ace/OS_NS_string.h"

// This function is passed to qsort to perform the comparison between
// login names for two friends.

int
Binary_Search::name_compare (const void *s1, const void *s2)
{
  return ACE_OS::strcmp ((*(Protocol_Record **) s1)->key_name1_,
                         (*(Protocol_Record **) s2)->key_name1_);
}

// Returns the next friend in the sequence of sorted friends.  Note
// that this function would be simplified if we expanded the iterator
// interface to include an "initialize" and "next" function!

Protocol_Record *
Binary_Search::get_next_entry (void)
{
  // Reset the iterator if we are starting from the beginning.
  
  if (this->current_ptr_ == 0)
    this->current_ptr_ = this->sorted_record_;
  
  // Now check to see if we've hit the end, in which case we set
  // things up for the next round!
  
  if (this->current_ptr_ < this->sorted_record_ + this->count_)
    return *this->current_ptr_++;
  else
    {
      this->current_ptr_ = 0;
      return 0;
    }
}

// An iterator, similar to Binary_Search::get_next_friend, though in
// this case the friend records are returned in the order they
// appeared in the friend file, rather than in sorted order.  Also, we
// skip over entries that don't have any hosts associated with them.

Protocol_Record *
Binary_Search::get_each_entry (void)
{
  // Reset the iterator if we are starting from the beginning.
  
  if (this->current_index_ == -1)
    this->current_index_ = 0;
  
  // Now check to see if we've hit the end, in which case we set
  // things up for the next round!
  
  for (;
       this->current_index_ < this->count_;
       this->current_index_++)
    if (this->protocol_record_[this->current_index_].drwho_list_ != 0)
      return &this->protocol_record_[this->current_index_++];

  this->current_index_ = -1;
  return 0;
}

Binary_Search::~Binary_Search (void)
{
  if (Options::get_opt (Options::DEBUG))
    ACE_DEBUG ((LM_DEBUG,
                "disposing Binary_Search\n"));
} 

// Used to initialize the values for the iterators...

Binary_Search::Binary_Search (void)
  : current_ptr_ (0),
    current_index_ (0)
{
}
