linenum.cpp

Think in C++文中代码实现

// File from page 382 in "Thinking in C++" by Bruce Eckel
//////////////////////////////////////////////////
// From the compressed package ECKELT02.ZIP 4/11/95
// (Original ECKELT01.ZIP dated 2/21/95)
// Copyright (c) Bruce Eckel, 1995 
// Source code file from the book "Thinking in C++", 
// Prentice Hall, 1995, ISBN: 0-13-917709-4
// All rights reserved EXCEPT as allowed by the following 
// statements: You may freely use this file for your own 
// work, including modifications and distribution in 
// executable form only. You may copy and distribute this 
// file, as long as it is only distributed in the complete 
// (compressed) package with the other files from this 
// book and you do not remove this copyright and notice. 
// You may not distribute modified versions of the source 
// code in this package. This package may be freely placed 
// on bulletin boards, internet nodes, shareware disks and 
// product vendor disks. You may not use this file in 
// printed media without the express permission of the 
// author. Bruce Eckel makes no 
// representation about the suitability of this software 
// for any purpose. It is provided "as is" without express 
// or implied warranty of any kind. The entire risk as to 
// the quality and performance of the software is with 
// you. Should the software prove defective, you assume 
// the cost of all necessary servicing, repair, or 
// correction. 
// If you think you've found an error, please 
// email all modified files with loudly commented changes 
// to: [e-mail] (please use the same 
// address for non-code errors found in the book).
//////////////////////////////////////////////////

//: LINENUM.CPP -- Add line numbers
#include <fstream.h>
#include <strstrea.h>
#include <stdlib.h>
#include "..\allege.h"

main(int argc, char* argv[]) {
  if(argc < 2) {
    cerr << "usage: linenum file\n"
         << "adds line numbers to file"
         << endl;
    exit(1);
  }
  strstream text;
  {
    ifstream in(argv[1]);
    allegefile(in);
    text << in.rdbuf(); // Read in whole file
  } // Close file
  ofstream out(argv[1]); // Overwrite file
  const bsz = 100;
  char buf[bsz];
  int line = 0;
  while(text.getline(buf, bsz)) {
    out.setf(ios::right, ios::adjustfield);
    out.width(2);
    out << ++line << ") " << buf << endl;
  }
}