Question

我必须在C语言的Linux上用DOS实现 tree 命令，这样当我在目录中运行./tree时，它就像这样输出：

adir
   bdir
   cdir
      d.java
   edir
      fdir
         g.c
   hdir

我当前的代码看起来像这样，但是当我运行它时它甚至都没有终止，但我不知道如何修复它。请帮我解决一下！

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/stat.h>
#include <string.h>

#define MAXLEN 256

char currentDir[256];
const char *pathname;

void tree(DIR *dp, struct dirent *dp1, char currentDir[256], int spaces);
void treeHelper(DIR *dp, struct dirent *dp1, char currentDir[256], int spaces);

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

DIR *dp = opendir(".");
struct dirent *dp1 = readdir(dp);
int spaces = 0;
//char currentDir[256];
getcwd(currentDir, sizeof(currentDir));

while(dp1 != NULL) {
    if (strcmp(dp1->d_name, ".") == 0 || strcmp(dp1->d_name, "..") == 0) {
            continue;
    }

    if (dp1->d_type == DT_REG) {
            printf("%s\n", dp1->d_name);
    }


    if (dp1->d_type == DT_DIR) {
            tree(dp, dp1, currentDir, spaces);
    }
}
closedir(dp);
}

void tree(DIR *dp, struct dirent *dp1, char currentDir[256], int spaces) {

int i = 0;
strcat(currentDir, "/");
strcat(currentDir, dp1->d_name);

if((chdir(currentDir)) == -1){
        chdir("..");
        getcwd(currentDir, sizeof(currentDir));
        strcat(currentDir, "/");
        strcat(currentDir, dp1->d_name);

        for(i = 0; i < spaces; i++) {
            printf ("   ");
    }
        printf("%s (subdirectory)\n", dp1->d_name);
        spaces++;
        treeHelper(dp, dp1, currentDir, spaces);
}

else {
    for(i = 0; i < spaces; i++) {
            printf("   ");
    }
    printf("%s (subdirectory)\n", dp1->d_name);
    chdir(currentDir);
    spaces++;
    treeHelper(dp, dp1, currentDir, spaces);
}

}

void treeHelper(DIR *dp, struct dirent *dp1, char currentDir[256], int spaces) {
int i = 0;

while((dp1 = readdir(dp)) != NULL){

  if(strcmp(dp1->d_name, ".") == 0 || strcmp(dp1->d_name, "..") == 0)
    continue;

  //stat(currentPath, &statbuf);

  /*if(dit->d_type == 8 && argv[1] != NULL){*/
  if(dp1->d_type == DT_REG){
      for(i = 0; i < spaces; i++) {
          printf("   ");
      }
      printf("%s\n", dp1->d_name);
  }

  /*if(dit->d_type == 4)*/
  if(dp1->d_type == DT_DIR)
    tree(dp, dp1, currentDir, spaces);

}
}

谢谢！

Answer 1

我当前的代码看起来像这样，但是当我没有时，它甚至都没有终止跑吧......
struct dirent *dp1 = readdir(dp);
…
while(dp1 != NULL) {

您只需拨打readdir()一次，然后一次又一次地在同一 dirent 上进行无限循环操作。将其更改为

struct dirent *dp1;
…
while (dp1 = readdir(dp))
{

在C语言中在Linux上实现树命令（DOS）

1 个答案: