From 35ef400bdf2f26f51896d825eb92741a08fdddaf Mon Sep 17 00:00:00 2001
From: Lukas Jiriste <ljiriste@student.42prague.com>
Date: Thu, 10 Oct 2024 19:44:25 +0200
Subject: [PATCH] Add solution to ex04 (without Makefile)

---
 ex04/main.cpp | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 ex04/main.cpp

diff --git a/ex04/main.cpp b/ex04/main.cpp
new file mode 100644
index 0000000..696626c
--- /dev/null
+++ b/ex04/main.cpp
@@ -0,0 +1,67 @@
+#include <string>
+#include <fstream>
+#include <iostream>
+
+int	open_files(const char *filename, std::ifstream &old_file, std::ofstream &new_file)
+{
+	old_file.open(filename);
+	if (!old_file)
+	{
+		std::cout << "File " << filename << " not found!\n";
+		return (1);
+	}
+	new_file.open(std::string(filename).append(".replace").c_str());
+	if (!new_file)
+	{
+		std::cout << "File " << filename << ".replace could not be created!\n";
+		old_file.close();
+		return (1);
+	}
+	return (0);
+}
+
+void	rewrite_file(std::ifstream &old_file, std::ofstream &new_file,
+			std::string old_string, std::string new_string)
+{
+	std::string	line;
+	size_t		i;
+	size_t		j;
+
+	while (!old_file.eof())
+	{
+		std::getline(old_file, line);
+		j = 0;
+		while (1)
+		{
+			i = line.find(old_string, j);
+			if (i == std::string::npos)
+				break ;
+			new_file << line.substr(j, i - j) << new_string;
+			j = i + old_string.size();
+		}
+		new_file << line.substr(j) << '\n';
+	}
+}
+
+int	main(int argc, char **argv)
+{
+	std::ifstream	old_file;
+	std::ofstream	new_file;
+	std::string		old_str;
+	std::string		new_str;
+
+	if (argc != 4)
+	{
+		std::cout << "Wrong argument number, the correct usage is:\n"
+			"\tex04 FILENAME OLD_STRING NEW_STRING\n";
+		return (1);
+	}
+	if (open_files(argv[1], old_file, new_file))
+		return (2);
+	old_str = argv[2];
+	new_str = argv[3];
+	rewrite_file(old_file, new_file, old_str, new_str);
+	old_file.close();
+	new_file.close();
+}
+
-- 
2.30.2