inject.cpp

#include <iostream> 
#include <fstream> 
#include <string> 
#include <cstdio>  

int main(int argc, char *argv[]) { 
	if (argc == 1 || argv[1] == "--help") { 
		std::cout << "INJECT \n\n" << "Usage: inject [File] [Line Number] [Content] \n";
		return -3; // Help Command 
	} 
	else if (argc < 4) { 
		std::cout << "Invalid, Not Enough Arguments; Run --help For More Info. \n"; 
		return -2; // Not Enough Args 
	} 
	std::ifstream file(argv[1]); 
 std::string* pHemp = new std::string("temp_"); 
	*pHemp+=argv[1]; 
	const char* THEMP = (*pHemp).c_str(); 
	delete pHemp; 
	std::ofstream tfile(THEMP); 
	long num = std::stoi(argv[2]); 
	std::string line; 
	long li = 0; 
	bool numEx = false; 
	while (std::getline(file, line)) { 
		if (li == num) { 
		        for (short i=3;i<argc;i++) { tfile << argv[i]; } tfile << " \n"; numEx=1;  
		} 
		else { 
			tfile << line; tfile << " \n";  
		} 
		li++; 
	} 
	if (!numEx) { 
		if(li<1) { tfile << " \n"; }  
		for (short j=3;j<argc;j++) { 
			tfile << argv[j]; 
		} 
		tfile << " \n"; 
	}  
	if (file.good()) { 
		std::remove(argv[1]); 
	}
	file.close(); 
	tfile.close();  
	std::rename(THEMP, argv[1]); 
	return 0; 
}