自己动手写shell命令之ls -R1fF

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ls命令的R参数代表递归的列出所有子文件夹中的所有文件，1表示每一行只显示一个文件或文件夹，f表示不排序即输出，F表示在每项的输出的最后根据其文件类型相应的加上*/=>@|字符。通过c语言实现ls -R1fF命令的效果，其源代码如下：

#include <stdio.h>#include <sys/types.h>#include <dirent.h>#include <sys/stat.h>#include <pwd.h>#include <grp.h>#include <string.h>void listdir(char *);char get_type(struct stat *);int main(int argc,char * argv[]){if(argc == 1)listdir(".");else{int index = 1;while(argc > 1){listdir(argv[index]);index++;argc--;}}return 0;}void listdir(char * dirname){DIR * dir;struct stat info;//char pointer[];struct dirent * direntp;if((dir = opendir(dirname)) != NULL){printf("%s:\n",dirname);while((direntp = readdir(dir)) != NULL){char absolute_pathname[255];strcpy(absolute_pathname,dirname);strcat(absolute_pathname,"/");strcat(absolute_pathname,direntp->d_name);lstat(absolute_pathname,&info);printf("%s",direntp->d_name);printf("%c\n",get_type(&info));}printf("\n");rewinddir(dir);while((direntp = readdir(dir)) != NULL){if(strcmp(direntp->d_name,".") == 0 || strcmp(direntp->d_name,"..") == 0)continue;char absolute_pathname[255];strcpy(absolute_pathname,dirname);strcat(absolute_pathname,"/");strcat(absolute_pathname,direntp->d_name);lstat(absolute_pathname,&info);if(S_ISDIR((&info)->st_mode))listdir(absolute_pathname);}}}char get_type(struct stat * info){if(S_ISCHR(info->st_mode))return '*';if(S_ISDIR(info->st_mode))return '/';if(S_ISSOCK(info->st_mode))return '=';if(S_ISBLK(info->st_mode))return '>';if(S_ISLNK(info->st_mode))return '@';if(S_ISFIFO(info->st_mode))return '|';return ' ';}

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