Shell（C++实现，CodeBlocks+GCC编译）

程序效果：

　　只实现了login 、cd 、ls 、cat 四个命令。而且只能在 Windows 下运行。

代码：

//main.cpp 1 #include <iostream>
 #include "shell.h"
 using namespace std;
 int com_to_int(int com_num,char * command,char** coms){

     ;
 }
 int main()
 {
     ;
     char command[MAX_LENGTH_OF_COMMAND];
     char *coms[COM_NUM]={"login","ls","cd","cat","exit"};
     int (*func_ptrs[COM_NUM])(char *)={login,ls,cd,cat,shellexit};
     while(true){
         printf("%s%s%s%s%s","[",USER_NAME," ",GLOBLE_PATH,"]");
         gets(command);
         ){
             continue;
         }
         //printf("command: %s\n",command);
         //printf("command: %s\n",command);
         int i;
         ;i<COM_NUM;i++){
             ){
                 func_ptrs[i](command);
                 break;
             }
         }
         if(i==COM_NUM){
             printf("command not found.\n");
         }
     }
     cd("C:/0");
     ls(GLOBLE_PATH);
     ;
 }

//shell.h  1 #ifndef SHELL_H_INCLUDED
 #define SHELL_H_INCLUDED
 #include<io.h>
 #include<string.h>
 #include<stdio.h>
 #include<stdlib.h>

 #define MAX_LENGTH_OF_PATH 256
 #define MAX_LENGTH_OF_USERNAME 50
 #define MAX_LENGTH_OF_COMMAND 50
 #define MAX_LENGTH_OF_LINE 256
 ','\0'};
 char USER_NAME[MAX_LENGTH_OF_USERNAME]= {'g','u','e','s','t','\0'};
 int login(char * command)
 {
     printf("user name:");
     char username[MAX_LENGTH_OF_USERNAME];
     gets(username);
     FILE * pwd;
     pwd = fopen ("pwd","r");

     if (pwd!=NULL)
     {
         char line[MAX_LENGTH_OF_LINE];
         while (!feof(pwd))
         {
             if(fgets(line,MAX_LENGTH_OF_LINE,pwd)!=NULL)
             {
                 char * name=strtok(line," ");
                 //printf("%s\n",name);
                 )
                 {
                     char password[MAX_LENGTH_OF_USERNAME];
                     printf("password:");
                     gets(password);
                     char * pasw=strtok(NULL," \n\r");
                     //printf("file password:%s\n",pasw);
                     )
                     {
                         strcpy(USER_NAME,username);
                     }
                     else
                     {
                         printf("wrong password.\n");
                     }
                     fclose (pwd);
                     ;
                 }
             }
         }
         printf("user not exist.\n");
         fclose (pwd);
     }
     else
     {
         printf("login error.pwd file not exist or not able to open.\n");
     }
     ;
 }
 int shellexit(char * command)
 {
     exit();
     ;
 }
 int cat_file(char * file_path)
 {
     FILE* f=fopen(file_path,"r");
     if(f==NULL)
     {
         printf("file does not exist.\n");
         ;
     }
     char line[MAX_LENGTH_OF_LINE];
     while(!feof(f))
     {
         fgets(line,MAX_LENGTH_OF_LINE,f);
         ;i<strlen(line);i++){
             if(line[i]=='\0')break;
             printf("%c",line[i]);
         }

     }
     printf("\n");
     ;
 }
 int cat(char * command)
 {
     char * path=strtok(command," ");
     path=strtok(NULL," ");
     //printf("path:%s",path);
     cat_file(path);
     ;
 }

 int cd_path(char *path)
 {
     struct _finddata_t f;
     int p;
     //printf("1");
     /* FILE * pFile;
     pFile = fopen (path,"r");
     if (pFile!=NULL)
     {      printf("2");
     }printf("3");*/
     )
     {
         //printf("%d",p);
         //printf("2");
         //printf(" %d ",f.attrib);
         if(f.attrib&_A_SUBDIR)
         {
             //printf("4");
             strcpy(GLOBLE_PATH,path);
             ;
         }
         else
         {
             printf("destination path is not a folder.\n");
         }
     }
     else
     {
         printf("destination not exist.\n");
     }
     ;
 }

 int cd(char * command)
 {
     char * path=strtok(command," ");
     path=strtok(NULL," ");
     //printf("path:%s",path);
     cd_path(path);
     ;
 }

 int ls_path(char * path)
 {
     struct _finddata_t f;
     int p;
     char name[MAX_LENGTH_OF_PATH];
     strcpy(name,path);
     strcat(name,"/*");
     //printf("1");
     )
     {
         //read(p,filename,)
         //printf("2");
         printf(f.name);
         printf("\n");
         )
         {
             printf(f.name);
             printf("\n");
         }
     }
     else
     {
     }
     ;
 }
 int ls(char * command)
 {
     char * path=strtok(command," ");
     path=strtok(NULL," ");
     //printf("path:%s",path);
     )
     {
         ls_path(GLOBLE_PATH);
     }
     else
     {
         ls_path(path);
     }
     ;
 }
 #endif // SHELL_H_INCLUDED

外部资源文件：

pwd（login 命令使用）：

ma
xue
wei 

程序写于大三下学期，2016年3月。

2016.4.12更新博客。

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