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CTBlineStream.cxx

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/*----------------------------------------------------------------------------*/
/* C Tool Box: Designed and implemented by:                                   */
/*    Walter F.J. Mueller   Gesellschaft fuer Schwerionenforschung (GSI)      */
/*                          Planckstrasse 1, D-64291 Darmstadt, Germany       */
/*                  Email:  W.F.J.Mueller@gsi.de                              */
/*                  WWW:    http://www-kp3.gsi.de/www/kp3/people/mueller.html */
/*------------------------------------------+---------------------------------*/

#include <string.h>

#include <fstream.h>

#include "CTB.hxx"
#include "CTBlineStream.hxx"

//------------------------------------------+-----------------------------------

CTBlineStream::CTBlineStream()
  : mp_is(0),
    mb_attached(false),
    mb_valid_line(false),
    mb_reread_line(false)
{}

//------------------------------------------+-----------------------------------

CTBlineStream::~CTBlineStream()
{
  Close();
}

//------------------------------------------+-----------------------------------

bool CTBlineStream::Open(const char* c_name)
{
  ifstream* p_ifs;
  
  Close();

  if (!c_name) return false;

  if (strcmp(c_name,"-")==0) {
    Attach(&cin);
    return true;
  }

  p_ifs = new ifstream;
  p_ifs->open(c_name);
  mp_is = p_ifs;
  
  return *mp_is;
}

//------------------------------------------+-----------------------------------

void CTBlineStream::Attach(istream* p_is)
{  
  Close();

  if (p_is) {
    mp_is       = p_is;
    mb_attached = true;
  }
  
  return;
}

//------------------------------------------+-----------------------------------

void CTBlineStream::Close()
{
  if (!mp_is) return;                       // quit if not connected
  
  if (!mb_attached) delete mp_is;           // close and delete if Open()ed
  
  mp_is          = 0;
  mb_attached    = false;
  mb_valid_line  = false;
  mb_reread_line = false;
  
  return;
}

//------------------------------------------+-----------------------------------

bool CTBlineStream::Get(CTBstring& line)
{
  bool b_ok = Get();
  
  line = m_line;
  return b_ok;
}

//------------------------------------------+-----------------------------------

bool CTBlineStream::Get(const char*& c_line)
{
  bool b_ok = Get();
  
  c_line = m_line;
  return b_ok;
}

//------------------------------------------+-----------------------------------

bool CTBlineStream::Unget()
{
  if (!mp_is) return false;                 // not connected
  if (!mb_valid_line) return false;         // no valid line
  if (mb_reread_line) return false;         // nested ungets
  mb_reread_line = true;
  return true;
}

//------------------------------------------+-----------------------------------
bool CTBlineStream::Get()                   // get next line
{
  if (!mp_is) return false;
  if (mb_reread_line) {
    mb_reread_line = false;
    return true;
  }

  mb_valid_line = m_line.GetLine(*mp_is);
  if (!mb_valid_line) m_line = "";

  return mb_valid_line;
}

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