///////////////////////////////////////////////////////////////
//                                                           //
//  top.cpp   -   send first few file lines to output        //
//                                                           //
//  version:      2.0                                        //
//  Language:     Borland C++, ver 5.0                       //
//  Platform:     Dell Pentium 200, Windows NT 4.0           //
//  Application:  CSE687 Example                             //
//  Author:       Jim Fawcett                                //
//                CST 2-187, (315) 443-3948                  //
//                fawcett@neptune.syr.edu                    //
///////////////////////////////////////////////////////////////
/*


    usage: top [-15] file1.hpp file2.cpp ..


*/
///////////////////////////////////////////////////////////////
//  Build Process                                            //
//  -------------                                            //
//  Files required:                                          //
//  top.cpp, \bc5\lib\32bit\wildargs.obj                     //
//                                                           //
//  build command for Neptune cluster:                       //
//  bcc32 -w+ top.cpp wildargs.obj                           //
//                                                           //
///////////////////////////////////////////////////////////////
/*

    Maintenance History
    -------------------
      ver 2.0 : 10 Jan 98
        - move static global variable dispLines to become local 
          variable in main
        - use standard C++ string class in place of custom str class
      ver 1.1 : 09 Jan 98
        - cosmetic modifications to this page
      ver 1.0 : 24 Dec 95
        - first release

*/

//

#include <fstream>    // ifstream(), >>, <<, cout
#include <stdlib>     // atoi()
#include <string>

using namespace std;

//----< display top few lines of file >------------------------

void showTop(char *fileName, int dispLines) {

// open file
  ifstream in(fileName);
  if(!in.good()) {
    cerr << "can't open file " << fileName << endl;
    return;
  }
// announce file name to output
  cout << fileName << endl;

// read dispLines strings from the top of input file
// and send to standard output

  string s;
  int j;

  for(j=0; j<dispLines; j++) {
    getline(in,s,'\n');   // terminating '\n' character should be default
    if(!in.good())        // per ANSI std but is not in Borland library
      break;
    cout << s.c_str() << endl;
  }
  cout << endl;
}


//----< process commands and display files >-------------------

void main(int argc, char *argv[]) {

  int dispLines = 10;
  int i;
  for(i=1; i<argc; i++) {

    if(argv[i][0] == '-') {             // commands start with '-'
      dispLines = atoi(&argv[i][1]);
      continue;
    }
    else
      showTop(argv[i], dispLines);
  }
}