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shell.cpp
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251 lines (230 loc) · 8.46 KB
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#include <iostream>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <vector>
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include <signal.h>
#include <ctime>
#define RESET "\033[0m"
#define BLACK "\033[30m" /* Black */
#define RED "\033[31m" /* Red */
#define GREEN "\033[32m" /* Green */
#define YELLOW "\033[33m" /* Yellow */
#define BLUE "\033[34m" /* Blue */
#define MAGENTA "\033[35m" /* Magenta */
#define CYAN "\033[36m" /* Cyan */
#define WHITE "\033[37m" /* White */
#define BOLDBLACK "\033[1m\033[30m" /* Bold Black */
#define BOLDRED "\033[1m\033[31m" /* Bold Red */
#define BOLDGREEN "\033[1m\033[32m" /* Bold Green */
#define BOLDYELLOW "\033[1m\033[33m" /* Bold Yellow */
#define BOLDBLUE "\033[1m\033[34m" /* Bold Blue */
#define BOLDMAGENTA "\033[1m\033[35m" /* Bold Magenta */
#define BOLDCYAN "\033[1m\033[36m" /* Bold Cyan */
#define BOLDWHITE "\033[1m\033[37m" /* Bold White */
#define BACKBLACK "\033[40m"
#define BACKRED "\033[41m"
#define BACKGREEN "\033[42m"
#define BACKYELLOW "\033[43m"
#define BACKBLUE "\033[44m"
#define BACKMAGENTA "\033[45m"
#define BACKCYAN "\033[46m"
#define BACKWHITE "\033[47m"
using namespace std;
int fd[2], in, out, pid;
vector<string> partials;
vector<string> path;
string trim(string input)
{
int i = 0;
while (i < input.size() && input[i] == ' ')
i++;
if (i < input.size())
input = input.substr(i);
else
{
return "";
}
i = input.size() - 1;
while (i >= 0 && input[i] == ' ')
i--;
if (i >= 0)
input = input.substr(0, i + 1);
else
return "";
return input;
}
vector<string> split(string line, string separator)
{
vector<string> result;
while (line.size())
{
size_t found = line.find(separator);
if (found == string::npos)
{
string lastpart = trim(line);
if (lastpart.size() > 0)
{
result.push_back(lastpart);
}
break;
}
string segment = trim(line.substr(0, found));
line = line.substr(found + 1);
if (segment.size() != 0)
result.push_back(segment);
}
return result;
}
char **char_array(vector<string> parts)
{
char **result = new char *[parts.size() + 1]; // the last one for the NULL
for (int i = 0; i < parts.size(); i++)
{
result[i] = new char[parts[i].size() + 1]; // the last one for the NULL
strcpy(result[i], parts[i].c_str());
}
result[parts.size()] = NULL;
return result;
}
void changeDirectory(vector<string> args)
{
char buf[80];
getcwd(buf, sizeof(buf));
if (chdir(args[1].c_str()) == -1)
{
if(args[1] != ""){
cout << "No such Directory" << endl;
}else{
chdir(getenv("HOME"));
path[2] = "~";
}
}
else
{
getcwd(buf, sizeof(buf));
path[2] = buf;
}
}
void execute(string cmdIn)
{
string cmd = cmdIn;
vector<string> inString = split(cmd, "<");
if (inString.size() > 1)
{
vector<string> fileInVec = split(inString[1], " ");
int fdIn = open(fileInVec[0].c_str(), O_RDONLY);
if (fdIn == -1)
{
perror("");
}
else
{
dup2(fdIn, 0);
close(fdIn);
}
cmd = inString[0];
for (int i = 1; i < fileInVec.size(); i++)
{
cmd += " " + fileInVec[i];
}
}
vector<string> outString = split(cmd, ">");
if (outString.size() > 1)
{
vector<string> fileOutVec = split(outString[1], " ");
remove(fileOutVec[0].c_str());
int fdOut = open(fileOutVec[0].c_str(), O_CREAT | O_WRONLY);
dup2(fdOut, 1);
close(fdOut);
cmd = outString[0];
for (int i = 1; i < fileOutVec.size(); i++)
{
cmd += " " + fileOutVec[i];
}
}
vector<string> argstr = split(cmd, " ");
char **args = char_array(argstr); // convert vector<string> into an array of char*
if (argstr[0] == "cd")
{
changeDirectory(argstr);
}
else
{
if (execvp(args[0], args) == -1)
{
perror("");
}
}
}
int main()
{
char buf[80];
time_t timep = time(NULL);
getcwd(buf, sizeof(buf));
path.push_back(ctime(&timep)); //get current time
path.push_back(getenv("USER")); //get current user
path.push_back(buf);
path[0].pop_back();
cout << BOLDRED << " ___ ________ ___ ___ _______ ___ ___ " << endl;
cout << BOLDGREEN << " |\\ \\|\\ ____\\|\\ \\|\\ \\|\\ ___ \\ |\\ \\ |\\ \\ " << endl;
cout << BOLDBLUE << " \\ \\ \\ \\ \\___|\\ \\ \\\\\\ \\ \\ __/|\\ \\ \\ \\ \\ \\ " << endl;
cout << BOLDCYAN << " __ \\ \\ \\ \\_____ \\ \\ __ \\ \\ \\_|/_\\ \\ \\ \\ \\ \\ " << endl;
cout << BOLDMAGENTA << "|\\ \\\\_\\ \\|____|\\ \\ \\ \\ \\ \\ \\ \\_|\\ \\ \\ \\____\\ \\ \\____ " << endl;
cout << BOLDWHITE << "\\ \\________\\____\\_\\ \\ \\__\\ \\__\\ \\_______\\ \\_______\\ \\_______\\" << endl;
cout << BOLDYELLOW << " \\|________|\\_________\\|__|\\|__|\\|_______|\\|_______|\\|_______|" << endl;
cout << BOLDBLACK << " \\|_________| " << endl;
while (true)
{
cout << BACKWHITE << BOLDBLACK << path[0] << RESET << " " << BOLDBLUE << path[1] << BOLDCYAN << "@" << BOLDGREEN << path[2] << " "
<< ">>" << RESET;
string cmd;
getline(cin, cmd);
if (cmd == "exit")
{
cout << BACKYELLOW << BOLDBLACK << " _____ ______ ________ _________ ________ ________ _______ ________ _______ " << RESET << endl;
cout << BACKYELLOW << BOLDMAGENTA << "|\\ _ \\ _ \\|\\ __ \\|\\___ ___\\\\ __ \\ |\\ ___ \\|\\ ___ \\ |\\ ___ \\|\\ ___ \\ " << RESET << endl;
cout << BACKYELLOW << BOLDBLUE << "\\ \\ \\\\\\__\\ \\ \\ \\ \\|\\ \\|___ \\ \\_\\ \\ \\|\\ \\ \\ \\ \\\\ \\ \\ \\ __/|\\ \\ \\\\ \\ \\ \\ __/| " << RESET << endl;
cout << BACKYELLOW << BOLDCYAN << " \\ \\ \\\\|__| \\ \\ \\ __ \\ \\ \\ \\ \\ \\ __ \\ \\ \\ \\\\ \\ \\ \\ \\_|/_\\ \\ \\\\ \\ \\ \\ \\_|/__ " << RESET << endl;
cout << BACKYELLOW << BOLDGREEN << " \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\\\ \\ \\ \\ \\_|\\ \\ \\ \\\\ \\ \\ \\ \\_|\\ \\ " << RESET << endl;
cout << BACKYELLOW << BOLDRED << " \\ \\__\\ \\ \\__\\ \\__\\ \\__\\ \\ \\__\\ \\ \\__\\ \\__\\ \\ \\__\\\\ \\__\\ \\_______\\ \\__\\\\ \\__\\ \\_______\\" << RESET << endl;
cout << BACKYELLOW << BOLDBLACK << " \\|__| \\|__|\\|__|\\|__| \\|__| \\|__|\\|__| \\|__| \\|__|\\|_______|\\|__| \\|__|\\|_______|" << RESET << endl;
cout << BACKYELLOW << " " << RESET << endl;
kill(0, SIGINT);
}
partials = split(cmd, "|");
in = 0;
for (int i = 0; i < partials.size(); i++)
{
pipe(fd); // make pipe
if ((pid = fork() == 0))
{
out = fd[1]; // redirect output to the next level
if (in != 0)
{
dup2(in, 0);
close(in);
}
if (i < partials.size() - 1)
{ // unless this is the last level
dup2(out, 1);
close(out);
}
execute(partials[i]); // execute all the arguments
}
else
{
wait(NULL); // wait for the child process
close(fd[1]); // do other redirects
in = fd[0];
}
}
cmd = "";
}
return 0;
}