///////    File: TLine_OS.C    ///////
#include        <iostream.h>
#include        <string.h>
#include        <stdlib.h>
#include        "TLine_OS.h"

TextLine_OS::TextLine_OS
(Uint  pos /* = 0*/, Uint size /* = 1024 */,
 Uint ll /* = 256 */, String dlm /* = DELIM */)
: key(pos, dlm)
{     maxlen = size;
      linelen = ll;
      lines = new String[size];
}

String TextLine_OS::operator[](Uint i)
{    if ( ! sorted() ) sort();
     return( i < len ? lines[i] : NULL );
}

void TextLine_OS::swap(Uint i, Uint j)
{ String tmp = lines[i];
     lines[i] = lines[j];
     lines[j] = tmp;
}

void TextLine_OS::input(istream& in)
{     len = read_lines(in);
      if (len < 0 )
      {  if (len == -1)
            cerr << "TextLines: Input file too large\n";
         else if (len < 0 )
            cerr << "TextLines: Line "
                 << 1-len << " too long\n";
         exit(1);
      }
}

int TextLine_OS::read_lines(istream& in)
{   int k, m = linelen + 2;
    String buf, s;
    String *lptr = lines, *end = lines + maxlen ;

    buf = new char[ m ];
    while( in.getline(buf, m, '\n') )
    {   k = strlen(buf);       // line length
        if ( lptr >= end )     // too many lines
            return(-1);
        else if ( k == m-1 )   // line too long
            return(lines - lptr);
        else if ( (s = new char[k]) == NULL )
            return(-1);        // no free store
        else
        {   strcpy(s, buf);    // copy buffer into s
            *lptr++ = s;       // put s on array lines
        }
    }
    delete buf;
    return(lptr - lines);      // total number of lines
}


void TextLine_OS::display(ostream& out)
{    String *lptr = lines,
         *end = lines + length() ;
     if ( ! sorted() ) sort();
     while(lptr < end) out << *lptr++ << '\n';
}

TextLine_OS::~TextLine_OS()
{    String *lptr = lines;
     while(len-- > 0)
        delete [] *lptr++;
     delete [] lines;
}

int TextLine_OS::append(void* line)    // append entry at end
{   if ( len < maxlen )
    {   lines[len++] = (char*) line;
        return(0);
    }
    return(-1);     // pointer array full
}

void TextLine_OS::remove(Uint i)    // delete entry i
{   delete [] lines[i];
    for ( int j=i ; j < len ; j++ )
         lines[j] = lines[j+1];
    len--;
}