編寫自己的ls程式

本程式用來仿照linux中的ls -l命令來實現的，主要運用的函數有opendir,readdir, lstat等。代碼如下：

#include <iostream>#include <vector>#include <cstdlib>#include <dirent.h>#include <sys/types.h>#include <sys/stat.h>#include <unistd.h>#include <cstring>#include <algorithm>using namespace std;void getFileAndDir(vector<string> &, char *);void displayFileDistribute(vector<string> &);int main(int argc ,char *argv[]){vector<string> file;if(argc != 2){cerr << "usage: ls /XXX" << endl;exit(1);}getFileAndDir(file, argv[1]);displayFileDistribute(file);/*vector<string>::iterator it = file.begin();for(; it != file.end(); ++it){//cout << *it << endl;}*/exit(0);}void getFileAndDir(vector<string> &file, char *dirName){DIR *dir;struct dirent *drt;dir = opendir(dirName);if(dir == NULL){cerr << "Cann't opendir " << dirName << endl;exit(1);}while((drt = readdir(dir)) != NULL){//cout << drt->d_name << endl;if(!strcmp(drt->d_name, ".") || !strcmp(drt->d_name, "..")){continue;}file.push_back(drt->d_name);}closedir(dir);}void displayFileDistribute(vector<string> &file){vector<string>::iterator it = file.begin();struct stat filestat;string perm[] = {"---", "--x", "-w-", "-wx", "r--", "r-x", "rw-", "rwx"};cout << "總計 " << file.size() << endl;sort(file.begin(), file.end());for(; it != file.end(); ++it){if(lstat((*it).c_str(), &filestat) == -1){cerr << "stat filed!" << endl;continue;}cout << filestat.st_ino << " "; //inodeif(S_ISREG(filestat.st_mode))cout << "-";else if(S_ISDIR(filestat.st_mode))cout << "d";else if(S_ISCHR(filestat.st_mode))cout << "c";else if(S_ISBLK(filestat.st_mode))cout << "b";else if(S_ISFIFO(filestat.st_mode))cout << "p";else if(S_ISLNK(filestat.st_mode))cout << "l";else if(S_ISSOCK(filestat.st_mode))cout << "s";elsecout << "X";//get permint i = 3;unsigned int mask = 0700;while(i > 0){cout << perm[(filestat.st_mode & mask) >> (i - 1) * 3];--i;mask >>= 3;}cout << " " << filestat.st_uid << " ";cout << filestat.st_gid << " ";string str = ctime(&filestat.st_atime); cout << str.substr(0, str.length() - 9) << " ";cout << *it << endl;}}

編譯運行代碼：程式需要接收一個目錄參數比如  ./ls /home/wyp