一、解析
void parse(){
std::string line;
getline(std::cin, line);
int len = line.size(), i=0;
std::string tmp;
std::vector<std::string> tmp_vc;
while(i < line.size()){
if(line[i] == ' '){
i++;
continue;
}
if(line[i] == '|') {
vc.push_back(tmp_vc);
tmp = "";
i++;
continue;
}
int pos = line.find(' ', i); // 获取下一个空格的位置
tmp = line.substr(i, pos-i); // 截取字符串
tmp_vc.push_back(tmp);
i = pos;
}
vc.push_back(tmp_vc);
}
二、执行命令函数
void func(std::vector<std::string>& v){
char *arr[10];
pid_t pid;
pid = fork();
if(pid == -1){
std::cout << "fork error" << std::endl;
exit(1);
}else if(pid ==0){
for(int i=0; i<v.size(); ++i)
arr[i] = (char *)v[i].c_str();
arr[v.size()] = NULL;
execvp(arr[0], arr);
}else{
wait(NULL);
}
}
void execCommnd(){
for(int i=0; i<vc.size(); ++i){
func(vc[i]);
}
}
三、模拟shell
void getCurPwd(){
std::string s = get_current_dir_name();
int pos = s.rfind('/');
std::string tmp = s.substr(pos+1, s.length()-pos);
std::cout << tmp << "]# ";
}
void getIdname(){
struct passwd *pwd;
pwd = getpwuid(getuid());
std::cout << "[" <<pwd->pw_name << "@";
}
void getHostName(){
char buf_w[128];
int hostname = gethostname(buf_w, sizeof(buf_w));
std::cout << buf_w << " ";
}
void showMenu(){
getIdname();
getHostName();
getCurPwd();
}
四、完整代码
#include <iostream>
#include <string>
#include <cstring>
#include <vector>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <pwd.h>
#include <wait.h>
std::vector<std::vector<std::string>> vc;
void parse(){
std::string line;
getline(std::cin, line);
int len = line.size(), i=0;
std::string tmp;
std::vector<std::string> tmp_vc;
while(i < line.size()){
if(line[i] == ' '){
i++;
continue;
}
if(line[i] == '|') {
vc.push_back(tmp_vc);
tmp = "";
i++;
continue;
}
int pos = line.find(' ', i); // 获取下一个空格的位置
tmp = line.substr(i, pos-i); // 截取字符串
tmp_vc.push_back(tmp);
i = pos;
}
vc.push_back(tmp_vc);
}
void func(std::vector<std::string>& v){
char *arr[10];
pid_t pid;
pid = fork();
if(pid == -1){
std::cout << "fork error" << std::endl;
exit(1);
}else if(pid ==0){
for(int i=0; i<v.size(); ++i)
arr[i] = (char *)v[i].c_str();
arr[v.size()] = NULL;
execvp(arr[0], arr);
}else{
wait(NULL);
}
}
void execCommnd(){
for(int i=0; i<vc.size(); ++i){
func(vc[i]);
}
}
void getCurPwd(){
std::string s = get_current_dir_name();
int pos = s.rfind('/');
std::string tmp = s.substr(pos+1, s.length()-pos);
std::cout << tmp << "]# ";
}
void getIdname(){
struct passwd *pwd;
pwd = getpwuid(getuid());
std::cout << "[" <<pwd->pw_name << "@";
}
void getHostName(){
char buf_w[128];
int hostname = gethostname(buf_w, sizeof(buf_w));
std::cout << buf_w << " ";
}
void showMenu(){
getIdname();
getHostName();
getCurPwd();
}
void test(){
while(1){
showMenu();
parse();
execCommnd();
}
}
int main(int argc, char* argv[])
{
test();
return 0;
}
四、运行结果
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