1  /* ************************************************************************** */
 2  /*                                                                            */
 3  /*                                                        :::      ::::::::   */
 4  /*   main.cpp                                           :+:      :+:    :+:   */
 5  /*                                                    +:+ +:+         +:+     */
 6  /*   By: gychoi <gychoi@student.42seoul.kr>         +#+  +:+       +#+        */
 7  /*                                                +#+#+#+#+#+   +#+           */
 8  /*   Created: 2023/07/27 17:05:36 by gychoi            #+#    #+#             */
 9  /*   Updated: 2023/07/28 03:43:36 by gychoi           ###   ########.fr       */
10  /*                                                                            */
11  /* ************************************************************************** */
12  
13  #include <iostream>
14  #include <fstream>
15  #include <sstream>
16  #include <string>
17  
18  std::string	editString(const std::string& str, const std::string& pattern, const std::string& replacement)
19  {
20  	std::string	output;
21  	std::size_t	pos = 0;
22  	std::size_t	strLength = str.length();
23  	std::size_t	patternLength = pattern.length();
24  
25  	if (!patternLength || !strLength || static_cast<int>(strLength - patternLength) < 0)
26  		return (str);
27  	while (pos <= strLength - patternLength)
28  	{
29  		if (str.substr(pos, patternLength) == pattern)
30  		{
31  			output += replacement;
32  			pos += patternLength;
33  		}
34  		else
35  			output += str[pos++];
36  	}
37  	output += str.substr(pos);
38  	return (output);
39  }
40  
41  int	main(int argc, char* argv[])
42  {
43  	if (argc != 4)
44  	{
45  		std::cout << "Usage: " << argv[0] << " <filename> <s1> <s2>" << std::endl;
46  		return (1);
47  	}
48  	const std::string	infile = argv[1];
49  	const std::string	s1 = argv[2];
50  	const std::string	s2 = argv[3];
51  	std::ostringstream	buffer;
52  	std::ifstream		ifs(infile.c_str());
53  	if (ifs.fail())
54  	{
55  		std::cout << "Error: Cannot open input file: " << infile << std::endl;
56  		return (1);
57  	}
58  	else
59  	{
60  		buffer << ifs.rdbuf();
61  		ifs.close();
62  	}
63  	std::string	output = editString(buffer.str(), s1, s2);
64  	const std::string	outfile = infile + ".replace";
65  	std::ofstream		ofs(outfile.c_str());
66  	if (ofs.fail())
67  	{
68  		std::cout << "Error: Cannot create output file: " << outfile << std::endl;
69  		return (1);
70  	}
71  	else
72  		ofs << output;
73  	return (0);
74  }