linux C 目录循环

#include
#include
#include
#include
#include

int mm (DIR *dp) {
 DIR *ap;
        struct dirent *dirp;
 while ((dirp = readdir(dp)) != NULL) {
  if (strcmp(dirp->d_name , ".") &&  strcmp(dirp->d_name, "..")) {
   printf("%s\n",dirp->d_name);
   if ((ap = opendir(dirp->d_name)) != NULL)
    if (!strcmp(ap,"DIR*"))
     mm(ap);
  }
 }
 closedir(dp);
 return 0;
}

int main(int argc, char *argv[]) {
 DIR *dp;

 if (argc != 2)
  printf("%s","usage: ls directory_name");

 if ((dp = opendir(argv[1])) == NULL)
  printf("%s", "kkdkkd");
 else
  mm(dp);
 
 _exit(0);
}

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#include
#include
#include
#include
#include
#include

void printdir(char *dir, int depth){
    DIR *dp;
    struct dirent *entry;
    struct stat statbuf;
  
    if((dp = opendir(dir)) == NULL){
        fprintf(stderr,"cannot open directory: %s\n",dir);
        return;
    }
    chdir(dir);
    while((entry = readdir(dp)) != NULL){
        lstat(entry->d_name,&statbuf);
        if(S_ISDIR(statbuf.st_mode)){
            if(strcmp("..",entry->d_name) == 0||
            strcmp(".",entry->d_name) == 0)
                continue;
            printf("%*s%s/\n",depth,"",entry->d_name);
            printdir(entry->d_name,depth+4);
        }
        else printf("%*s%s\n",depth,"",entry->d_name);
    }
    chdir("..");
    closedir(dp);
}

int main(int argc, char *argv[]) {
 printdir(argv[1],0);
}