Linux目录遍历实现 -- 列出当前目录下所有文件

雨点打透心脏的1/2处 2022-08-20 06:23 408阅读 0赞

#include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <unistd.h>
    #include <dirent.h>
    #include <sys/types.h>
    #include <sys/stat.h>
    
    #define MAX_PATH 512  //最大文件长度定义为512
    
    /*对目录中所有文件执行print_file_info操作*/
    void dirwalk(char *dir, void (*func)(char *))
    {
    	char name[MAX_PATH];
    	struct dirent *dp;
    	DIR *dfd;
    	
    	if((dfd = opendir(dir)) == NULL){
    		fprintf(stderr, "dirwalk: can't open %s\n", dir);
    		return;
    	}
    	
    	while((dp = readdir(dfd)) != NULL){ //读目录记录项
    		if(strcmp(dp->d_name, ".") == 0 || strcmp(dp -> d_name, "..") == 0){
    			continue;  //跳过当前目录以及父目录
    		}
    		
    		if(strlen(dir) + strlen(dp -> d_name) + 2 > sizeof(name)){
    			fprintf(stderr, "dirwalk : name %s %s too long\n", dir, dp->d_name);
    		}else{
    			sprintf(name, "%s/%s", dir, dp->d_name);
    			(*func)(name);
    		}
    	}
    	closedir(dfd);
    }
    
    /*打印文件信息*/
    void print_file_info(char *name)
    {
    	struct stat stbuf;
    	
    	if(stat(name, &stbuf) == -1){
    		fprintf(stderr, "file size: open %s failed\n", name);
    		return;
    	}
    	
    	if((stbuf.st_mode & S_IFMT) == S_IFDIR){ 
    		dirwalk(name, print_file_info);	 //如果是目录遍历下一级目录
    	}else{							
    		printf("%8ld    %s\n", stbuf.st_size, name);//不是目录，打印文件size及name
    	}
    }
    
    int main(int argc, char *argv[])
    {
    	printf("file size    file name\n");
    	if(argc == 1){
    		print_file_info(".");//未加参数执行时，从当前目录开始遍历
    	}else{
    		while(--argc>0){
    			print_file_info(*++argv);
    		}
    	}
    	
    	return 0;
    }

程序运行及执行结果：

yu@ubuntu:~/Linux/206/dirop$ gcc -o dir dir.c 
    
    yu@ubuntu:~/Linux/206/dirop$ ./dir 
    file size    file name
        7820    ./dir
        1351    ./dir.c
        
    yu@ubuntu:~/Linux/206/dirop$ ./dir /home/yu/Linux/206
    file size    file name
        7560    /home/yu/Linux/206/copy
           0    /home/yu/Linux/206/src
        7820    /home/yu/Linux/206/dir
         487    /home/yu/Linux/206/copy.c
        7516    /home/yu/Linux/206/lseek
        7516    /home/yu/Linux/206/llll/lseek
        1025    /home/yu/Linux/206/llll/x
         348    /home/yu/Linux/206/llll/lseek.c
           0    /home/yu/Linux/206/x
          24    /home/yu/Linux/206/dest
         348    /home/yu/Linux/206/lseek.c
        7820    /home/yu/Linux/206/dirop/dir
        1351    /home/yu/Linux/206/dirop/dir.c

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![这里写图片描述][20160206220109514]

[20160206220109514]: /images/20220731/391abeab801548dfb9237fd416de56fd.png