144 lines
3.1 KiB
C++
144 lines
3.1 KiB
C++
#include <iostream>
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#include <string>
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#include <map>
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#include <cstdlib>
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#include <filesystem>
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#include <vector>
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#ifdef _WIN32
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#include <process.h>
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#else
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#include <unistd.h>
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#include <sys/wait.h>
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#endif
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#include "shellUtils.h"
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int main()
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{
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std::vector<std::string> tokens;
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std::cout << std::unitbuf;
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std::cerr << std::unitbuf;
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bool shouldExit {false};
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while (!shouldExit)
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{
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tokens.clear();
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std::string input;
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std::string line;
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bool finshedInput{};
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std::cout << "$ ";
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while (!finshedInput and std::getline(std::cin, line))
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{
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auto end = line.size() - 1;
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if (line[end] == '\\')
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{
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if (end == 0)
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{
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std::cout << "> " ;
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}
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else
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{
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input += line.substr(0, line.size() - 1);
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std::cout << "> ";
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}
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}
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else
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{
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input += line;
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finshedInput = true;
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}
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}
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//trim whitespace and tabs from start and end
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const size_t start = input.find_first_not_of(" \t");
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if (start == std::string::npos)
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{// the input was all whitespace and tabs
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input.clear();
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}
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else
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{
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const size_t end = input.find_last_not_of(" \t");
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input = input.substr(start, end - start + 1);
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}
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if (input.empty())
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{
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continue;
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}
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//we can now assume there is actual text from the input
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sh::tokenize(tokens, input);
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std::optional<std::filesystem::path> result;
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switch (sh::Command command = sh::getCommand(tokens[0]))
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{
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case sh::Command::exit:
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shouldExit = true;
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break;
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case sh::Command::echo:
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for (int i = 1; i < tokens.size(); i++)
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{
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std::cout << tokens[i] << " ";
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}
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std::cout << "\n";
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break;
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case sh::Command::unknown:
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result = sh::isExec(tokens[0]);
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if (result)
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{
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std::vector<char*> args;
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args.push_back(const_cast<char*>(result.value().filename().c_str()));// have exe path on seperate element for execv
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for (size_t i = 1; i < tokens.size(); i++)
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{
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args.push_back(const_cast<char*>(tokens[i].c_str()));
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}
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args.push_back(nullptr);
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#ifdef _WIN32
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intptr_t status = _spawnv(_P_WAIT, result.value().c_str(), args.data());
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if (status == -1)
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{
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perror("\n\nError executing program\n\n");
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return 1;
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}
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#else
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pid_t pid = fork();
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if (pid == 0)
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{// child process
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execv(result.value().c_str(), args.data());
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perror("\n\nError executing program\n\n");
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exit(1);
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}
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else
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{
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int status;
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waitpid(pid, &status, 0);
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}
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#endif
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}
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else
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{
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std::cout << tokens[0] << ": command not found\n";
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}
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break;
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case sh::Command::type:
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sh::printType(tokens[1]);
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break;
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case sh::Command::pwd:
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std::cout << std::filesystem::current_path().string() << "\n";
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break;
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case sh::Command::cd:
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sh::changeDir(tokens);
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break;
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}
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}
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}
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