First serious commit: added source already developed

This commit is contained in:
Claudio Maggioni 2016-03-11 15:49:24 +01:00
parent ed204e9a28
commit 905766b3a9
9 changed files with 662 additions and 0 deletions

14
Msh.pro Normal file
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TEMPLATE = app
CONFIG += console c++11
CONFIG -= app_bundle
CONFIG -= qt
SOURCES += main.cpp \
command.cpp \
commands.cpp \
cmds.cpp
HEADERS += \
command.h \
commands.h \
cmds.h

334
Msh.pro.user Normal file
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29
cmds.cpp Normal file
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/**
builtin commands
*/
#include "cmds.h"
using namespace std;
int Cmds::cdExecute(const vector<string>* args){
if (args->operator[](1) == "\0") {
cerr << "msh: expected argument to \"cd\"\n";
} else {
if (chdir(args->operator[](1).c_str()) != 0) {
cerr << "msh";
}
}
return 1;
}
int Cmds::exitExecute(const vector<string>*){
std::exit(0);
}
int Cmds::helpExecute(const vector<string>*){
int i;
cout << "Claudio Maggioni's msh\n" << endl
<< "Type program names and arguments, and hit enter.\n" << endl;
return 1;
}

20
cmds.h Normal file
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/**
builtin commands
*/
#ifndef CMDS_H
#define CMDS_H
#include <iostream>
#include <vector>
#include <string>
#include <unistd.h>
using std::string;
using std::vector;
namespace Cmds {
int cdExecute(const vector<string>* args);
int exitExecute(const vector<string>*);
int helpExecute(const vector<string>*);
}
#endif // CMDS_H

33
command.cpp Normal file
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#include "command.h"
Command::Command(const string& n, int (*funcptr)(const vector<string>* args)) : name(n) , funcCommand(funcptr){
checkObj();
numCom++;
}
int Command::execute(const vector<string>* args){
return (*funcCommand)(args);
}
string Command::getName(){
return this->name;
}
Command::Command(const Command& old) : name(old.name) , funcCommand(old.funcCommand){
checkObj();
numCom++;
}
void Command::checkObj(){
for(unsigned int i=0; i<name.length(); i++){
if(!((name[i]>'a'&&name[i]<'z')||(name[i]>'A'&&name[i]<'Z'))){
throw CommandNameNotValidException();
}
}
}
Command::~Command(){
numCom--;
}
unsigned int Command::numCom = 0;

24
command.h Normal file
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#ifndef COMMAND_H
#define COMMAND_H
#include <string>
#include <vector>
using std::string;
using std::vector;
class Command
{
const string name;
static unsigned int numCom;
int (*funcCommand)(const vector<string>*);
void checkObj();
public:
Command(const string& n, int (*funcptr)(const vector<string>* args));
Command(const Command&);
~Command();
int execute(const vector<string>*);
string getName();
};
class CommandNameNotValidException{};
#endif // COMMAND_H

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#include "commands.h"
using namespace Cmds;
Commands::Commands()
{
if(created) throw CommandsAlreadyCreatedException();
created=true;
//add builtin commands
add(new Command("cd", &cdExecute));
add(new Command("exit", &exitExecute));
add(new Command("help", &helpExecute));
}
void Commands::add(Command* cmd){
commands.push_back(cmd);
}
int Commands::howMany(){
return commands.size();
}
int Commands::launch(const vector<string>* args){
for(int i=0; i<commands.size(); i++){
if((commands[i]->getName())==args->operator [](0)){
return commands[i]->execute(args);
}
}
throw CommandNotFoundException();
}
bool Commands::created = false;
//builtin commands

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#ifndef COMMANDS_H
#define COMMANDS_H
#include <string>
#include <vector>
#include <command.h>
#include "cmds.h"
using std::string;
using std::vector;
class Commands
{
vector<Command*> commands;
static bool created;
Commands(Commands&);
public:
Commands();
void add(Command*);
int howMany();
int launch(const vector<string>* args);
};
class CommandsAlreadyCreatedException{};
class CommandNotFoundException{};
#endif // COMMANDS_H

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/**
* Edit of lsh from https://github.com/brenns10/msh.git rewritten in C++
* by Claudio Maggiobi
*/
#include <sys/wait.h>
#include <unistd.h>
#include <cstdlib>
#include <sstream>
#include <cstdio>
#include <string>
#include <cstring>
#include <vector>
#include <iostream>
#include <csignal>
#include <commands.h>
using namespace std;
Commands cmds;
int msh_launch(vector<string>* args)
{
pid_t pid;
int status;
pid = fork();
if (pid == 0) {
vector<char *> argv(args->size() + 1);
size_t i;
for (i = 0; i != args->size()-1; ++i)
{
argv[i] = &(args->operator[](i)[0]);
}
argv[i] = NULL;
if(execvp(argv[0], argv.data()) == -1) {
cerr << "msh: command " << args->operator [](0) << " not found\n";
}
exit(EXIT_FAILURE);
}
else if (pid < 0) {
// Error forking
cerr << "msh: error forking\n";
}
else {
// Parent process
do {
waitpid(pid, &status, WUNTRACED);
} while (!WIFEXITED(status) && !WIFSIGNALED(status));
}
return 1;
}
int msh_execute(vector<string>* args)
{
if (args->operator [](0) == "\0") {
// An empty command was entered.
return 1;
}
int a;
try {
a=cmds.launch(args);
}
catch (CommandNotFoundException){
return msh_launch(args);
}
return a;
}
class IsUndoingLineException {};
bool undoingLine=false;
void mshEofHandler(int){
undoingLine = true;
}
string* msh_read_line()
{
string* buffer = new string();
struct sigaction *sa = new struct sigaction();
sa->sa_handler = mshEofHandler;
sa->sa_flags = 0; // not SA_RESTART!;
sigaction(SIGINT, sa, NULL);
getline(cin,*buffer); // get command
cin.clear(); // clear flags
if(undoingLine){
undoingLine=false;
throw IsUndoingLineException();
}
return buffer;
}
vector<string>* msh_split_line(string* line)
{
vector<string>* tokens = new vector<string>();
string ln = *line;
istringstream is(ln);
int i;
for(i=0; getline(is, ln, ' '); i++){
tokens->push_back(ln);
}
tokens->push_back("\0");
return tokens;
}
inline void msh_loop(void)
{
string* line;
vector<string>* args;
int status;
do {
bool readSuccess;
do{
cout << "MSH$ ";
try{
line = msh_read_line();
readSuccess = true;
}
catch (IsUndoingLineException){
cout << "\n";
readSuccess = false;
}
}while(!readSuccess);
args = msh_split_line(line);
status = msh_execute(args);
} while (status);
}
int main(int argc, char **argv)
{
// Load config files, if any.
// Run command loop
msh_loop();
// Perform any shutdown/cleanup.
return EXIT_SUCCESS;
}